Hioki 3287 User manual

CLAMP ON
AC/DC HiTESTER
Apr. 2016 Edition 1
Printed in Japan
3287C961-00 16-04H
3287
3288
3288-20
EN
Instruction Manual
Symbols afxed to the device
Precaution or hazard (See corresponding topic.)
Risk of electric shock
Protected throughout by double insulation or reinforced insulation
Device may be connected to or disconnected from a live conductor
Grounding
terminal DC (direct current) AC (alternating current)
Accuracy
We dene measurement tolerances in terms of rdg. (reading) and
dgt. (digit) values,with the following meanings:
rdg.
(reading or
displayed value)
The value currently being measured and
indicated on the measuring instrument.
dgt.
(resolution)
The smallest displayable unit on a digital measuring
instrument,i.e.,the input value that causes the digital
display to show a “1” as the least-signicant digit.
Measurement categories
This instrument’s current measurement part conforms to the safety
requirements for CAT III 600 V and the voltage measurement part
conforms to the safety requirements for CAT II 600 V,CAT III 300 V
measuring instruments.
Service entrance
Distribution panel
Service drop Internal wiring
Power meter
Fixed Installation
Outlet
CAT IV CAT III CAT II
DANGER
Measuring a location with a higher category number
than the measurement category indicated on this
device may result in a serious accident such as
electric shock.
To avoid electric shock, do not touch the portion
beyond the protective barrier during use.
Never apply voltage to the test leads when the
resistance and continuity functions are selected.
Doing so may damage the instrument and result in
bodily injury. To avoid electrical accidents, remove
power from the circuit before measuring.
WARNING
•To avoid electric shock,short circuits and damage
to the instrument,disconnect the test leads from the
measurement object before switching the rotary switch.
•To prevent electric shock,when measuring the voltage
of a power line use a test lead that satises the
following criteria:
•Conforms to safety standards IEC61010 or EN61010
•Of measurement category III or IV
•Its rated voltage is higher than the voltage to be measured
• The optional test leads for this instrument conform to the
safety standard EN61010. Use a test lead in accordance
with its dened measurement category and rated voltage.
•To avoid an electric shock,operate the instrument at
below a lower rated voltage between that indicated on
the instrument and on test leads.
WARNING
•Installing the instrument in inappropriate locations may
cause a malfunction of instrument or may give rise to
an accident. Avoid the following locations:
•Exposed to direct sunlight or high temperature
•Exposed to corrosive or combustible gases
• Exposed to a strong electromagnetic eld or
electrostatic charge
• Near induction heating systems (such as high-frequency
induction heating systems and IH cooking equipment)
•Susceptible to vibration
•Exposed to water,oil,chemicals,or solvents
•Exposed to high humidity or condensation
•Exposed to high quantities of dust particles
WARNING
•Since there is a risk of electric shock,check that the
insulation on the test lead are neither ripped nor torn,and
no metal conductor inside the wire are exposed before
using the instrument. If damaged,replace them with those
specied by our company.
•To prevent a short circuit accident,be sure to use the
test leads with the sleeves attached when performing
measurements in the CAT III measurement category.
•If the sleeves are inadvertently removed during
measurement,stop the measurement.
• With regard to the electricity supply,there are risks of
electric shock,heat generation, re, and arc ash due
to short circuits. If persons unfamiliar with electricity
measuring instrument are to use the instrument,another
person familiar with such instruments must supervise
operations.
•This instrument is measured on a live line. To prevent
electric shock,use appropriate protective insulation and
adhere to applicable laws and regulations.
•Handle and dispose of batteries in accordance with
local regulations.
CAUTION
•Do not place foreign objects between the jaw tips or
insert foreign objects into the gaps of the jaws (or exible
loop couplings). Doing so may worsen the performances
of the sensor or interfere with clamping action.
• Be careful to avoid dropping the instrument or otherwise
subjecting them to mechanical shock,which could
damage the jaw and adversely affect measurement.
Poor performance or damage from battery leakage
could result. Observe the cautions listed below:
•Do not use batteries after their recommended expiry date.
•Do not allow weak batteries to remain in the instrument.
• Replace batteries only with the specied type.
•Remove the batteries from the instrument if it is to be
stored for a long time.
•The indicator lights up when the remaining battery
capacity is low. In this case,the instrument's reliability is
not guaranteed. Replace the battery immediately.
•To avoid battery depletion,turn the rotary switch OFF
after use (the auto power save feature consumes a small
amount of current).
Inspection Before Measurement
•Verify that the instrument operates normally to ensure that no
damage occurred during storage or shipping. If you nd any
damage,contact your authorized Hioki distributor or reseller.
•If damage is suspected,check the section below before contacting
your authorized Hioki distributor or reseller.
(1) Check that the test lead is not broken.
Replace with the specied L9208 Test Lead.
(2) Check that the resistance measurement and continuity test
operates normally.
Have the instrument repaired by the your authorized Hioki
distributor or reseller. The instrument may have been subject to
a voltage of greater than 600 V during resistance measurement
or continuity testing.
(3) Check that the battery voltage is not low.
Replace the batteries.
Maintenance/Inspection
Cleaning
• Measurements are degraded by dirt on the mating surfaces of the jaw
,so keep the surfaces clean by gently wiping with a soft,dry cloth.
•To clean the device,wipe it gently with a soft cloth moistened with
water or mild detergent.
• Wipe the LCD display gently with a soft,dry cloth.
Insert/Replace Batteries
Necessary tool: Phillips screwdriver and CR2032 Coin-shaped lithium battery
NO
OK
NO
OK
1 2 34
Do not turn the adjustment screw inside the battery case. Doing
so will cause the instrument to report abnormal measured values.
CALIFORNIA,USA ONLY
Perchlorate Material - special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate
Warranty
Warranty malfunctions occurring under conditions of normal use in
conformity with the Instruction Manual and Product Precautionary
Markings will be repaired free of charge. This warranty is valid for a
period of three (3) years from the date of purchase. Please contact
the distributor from which you purchased the product for further
information on warranty provisions.
Introduction
Thank you for purchasing the Hioki 3287/3288/3288-20 AC Clamp
Meter. To obtain maximum performance from the instrument,please
read this manual rst,and keep it handy for future reference.
3288 Average value measurement RMS conversion model
3287
3288-20 True RMS measurement model
Safety Notes
This instrument is designed to conform to IEC 61010 Safety
Standards,and has been thoroughly tested for safety prior to
shipment. However,using the instrument in a way not described in
this manual may negate the provided safety features. Before using
the instrument,be certain to carefully read the following safety notes.
Notation
In this document,the risk seriousness and the hazard levels are
classied as follows.
DANGER Imminent risk of operator death or serious injury
WARNING Potential for operator death or serious injury
CAUTION Potential for minor operator injury or device
damage or malfunction
Risk of electric shock
Prohibited actions
Actions that must be performed
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Functions
Display will automatically turn off if the instrument is not used
for 30 min. (Auto power-saving function)
•The auto power save function is activated automatically when the
power is turned on. (Not possible to cancel)
•To resume instrument operation in the previous state,select the
“OFF” position with the rotary switch and then move the switch to
the desired function.
Automatically sets the measurement range to the most appropriate
range (Auto-range function)
Displays [AUTO]
To set the measurement range arbitrarily (Manual-range function)
•Power on the tester while holding down the or HOLD key to
select a manual range for measuring AC current [ ],DC current [
],AC voltage [ ],DC voltage [ ] or resistance [ ].
•Note that this function is not available for continuity testing.
Press the key to step to the next range.
•To switch between AC voltage [ ] and DC voltage [ ],press
and hold the key for at least one second.
Indication when input exceeds the measurement range (Overow indication)
Displays [OF] or [-OF]
Zero-adjust Function
•The zero adjustment function compensates for sensor magnetization
and changes in current display over time.
•Before measuring DC current [ ],you must perform zero
adjustment by simultaneously pressing the and HOLD keys
while there is no input to the instrument.
•This function is only effective with measurement of DC current [ ].
Parts Names
MADE IN JAPAN
BATTERY: CR 2032
RATING :
1 15mVA 3V
MADE IN JAPAN
BATTERY: CR 2032
RATING :
1 15mVA 3V
RearFront
Jaw
Barrier
Operation grip
LCD Display
Rotary switch
key
HOLD key
(Press to hold the
display value.)
Test lead plug
Measurement
terminal Battery cover
Sleeves (Red)
(Black)
Test leads
Measurement Methods
Current Measurement
AC Current Measurement [ ]
1
OK NO
OK NO
2
OK NO
3
DC Current Measurement [ ]
Perform zero adjustment by
simultaneously pressing
12
Current
direction
3
Current direction
indicator
Voltage Measurement
AC Voltage Measurement [ ]
1 2 3
DC Voltage Measurement [ ]
NO
OK
123
Black(−) Red (+)
Red (+) Black(−)
Resistance Measurement [ ]
21 3 4
Continuity check [ ]
21 3 4
Specications
General Specications
Operating
environment Indoors, pollution degree 2,
altitude up to 2000 m (6562 ft.)
Operating
temperature
and humidity
0°C to 40°C (32°F to 104°F)
80% RH or less (no condensation)
Storage
temperature
and humidity
−10°C to 50°C (14°F to 122°F),
80% RH or less (no condensation)
Standards Safety: EN61010
EMC: EN61326
Power supply CR2032 Coin-shaped lithium battery ×1 (3 V DC)
Maximum rated power: 15 mVA
Continuous
operating time
3287: Approx. 25 hours, 3288: Approx. 60 hours,
3288-20: Approx. 35 hours
(continuous,unloaded)
Dimensions
Approx. 57W×180H×16D mm (2.24″W × 7.09″H ×
0.63″D)
Mass • 3287: Approx. 170 g (6.0 oz.)
• 3288, 3288-20: Approx. 150 g (5.3 oz.)
Product
warranty period
3 years
Accessories • CR2032 Coin-shaped lithium battery
• 9398 Carrying Case
• L9208 Test lead
•Instruction Manual
Option • 9209 Test Leads Holder
• L4933 Contact Pin Set
(Can be connected to the tip of the L9208,which
comes with the instrument.)
• L4934 Small Alligator Clip Set
(Can be connected to the tip of the L9208,which
comes with the instrument.)
Basic Specications
Maximum input
current
3287: 100 A AC
/DC continuous (ACA/DCA)
3288, 3288-20: 1000 A AC
/DC continuous
(ACA/DCA)
Maximum input
voltage
600 V AC/DC (ACV/DCV)
Overload
protection 600 V AC/DC (ACV/DCV)
250 V AC/DC (Ω/continuity)
Maximum
rated voltage
to earth
•Jaw
600 V AC (Measurement category III),
(Anticipated transient overvoltage: 6000 V)
•Voltage measurement terminal (ACV/DCV)
600 V AC (Measurement category II),
300 V AC (Measurement category III)
(Anticipated transient overvoltage: 4000 V)
AC
measurement
method
3288 : Average value measurement RMS method
3287, 3288-20: True RMS measurement method
Display update
rate 400 ms±25 ms
Crest factor
• 3287: 2.5 max
Current range: 150 A max., Voltage range: 1000 V max.
• 3288-20: 3 max.
Current range: 1000 A range is 2 max.,
Voltage range: 1.5 max.
Zero-display
range 5 counts or less (current measurement only)
Effects of
conductor
position
• 3287: within ±1.0%
• 3288, 3288-20: within ±2.0%
(At all positions around the sensor’s centerpoint reference)
Maximum
measurable
conductor
diameter
φ35 mm or less
Accuracy Specications
Conditions of
guaranteed
accuracy
•Guaranteed accuracy period: 1 year (Number of jaw
open/close cycles: 10,000 or less)
•Guaranteed accuracy period after adjustment
made by Hioki: 1 year
•Battery warning indicator is not lighting
•Temperature and humidity for guaranteed accuracy:
23°C±5°C (73.0°F±9.0°F), 80% RH or less (no
condensation)
•Temperature characteristic: 0°C to 40°C
Measurement accuracy × 0.1/°C is added
AC current measurement (ACA)
3287
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<20 Hz 20 Hz≤f<45 Hz
66 Hz<f≤1 kHz
10.00 A
100.00 A ±1.5%rdg.±5dgt. ±5.0%rdg.±5dgt. ±2.0%rdg.±5dgt.
3288
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<45 Hz, 66 Hz<f≤500 Hz
100.0 A
1000 A ±1.5%rdg.±5dgt. ±2.0%rdg.±5dgt.
3288-20
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<45 Hz, 66 Hz<f≤500 Hz
100.0 A
1000 A ±1.5%rdg.±5dgt. ±2.0%rdg.±5dgt.
DC current measurement (DCA)
3287
Range Accuracy
10.00 A
100.0 A ±1.5%rdg.±5dgt.
3288/3288-20
Range Accuracy
100.0 A
1000 A ±1.5%rdg.±5dgt.
AC voltage measurement (ACV)
Range
Accuracy guarantee range
Accuracy
Input impedance
30 Hz ≤f≤ 500 Hz
4.200 V
42.00 V
420.0 V
600 V
0.400 V to 4.199 V
4.00 V to 41.99 V
40.0 V to 419.9 V
400 V to 600 V
±2.3%rdg.±8dgt.
11 MΩ±5%
10 MΩ±5%
10 MΩ±5%
10 MΩ±5%
DC voltage measurement (DCV)
Range
Accuracy guarantee
range
Accuracy Input
impedance
420.0 mV
4.200 V
42.00 V
420.0 V
600 V
40.0 mV to 419.9 mV
0.400 V to 4.199 V
4.00 V to 41.99 V
40.0 V to 419.9 V
400 V to 600 V
±1.3%rdg.±4dgt.
100 M
Ω
or more
11 MΩ±5%
10 MΩ±5%
10 MΩ±5%
10 MΩ±5%
Resistance measurement (Ω)
Range
Accuracy guarantee
range
Accuracy Open terminal voltage
420.0
Ω
4.200 k
Ω
42.00 k
Ω
420.0 k
Ω
4.200 M
Ω
42.00 M
Ω
40.0
Ω
to 419.9
Ω
0.400 k
Ω
to 4.199 k
Ω
4.00 k
Ω
to 41.99 k
Ω
40.0 k
Ω
to 419.9 k
Ω
0.400 M
Ω
to 4.199 M
Ω
4.00 M
Ω
to 41.99 M
Ω
±2.0%rdg.±4dgt.
±2.0% rdg.±4dgt.
±2.0% rdg.±4dgt.
±2.0% rdg.±4dgt.
±5.0% rdg.±4dgt.
±10.0%rdg.±4dgt.
3.4 V or less
0.7 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
Continuity test
Range Accuracy Threshold level
(beep sound) Open terminal voltage
420.0 Ω±2.0%
rdg.± 6dgt. 50
Ω
±40
Ω
or less 3.4 V or less
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

Functions
Display will automatically turn off if the instrument is not used
for 30 min. (Auto power-saving function)
•The auto power save function is activated automatically when the
power is turned on. (Not possible to cancel)
•To resume instrument operation in the previous state,select the
“OFF” position with the rotary switch and then move the switch to
the desired function.
Automatically sets the measurement range to the most appropriate
range (Auto-range function)
Displays [AUTO]
To set the measurement range arbitrarily (Manual-range function)
•Power on the tester while holding down the or HOLD key to
select a manual range for measuring AC current [ ],DC current [
],AC voltage [ ],DC voltage [ ] or resistance [ ].
•Note that this function is not available for continuity testing.
Press the key to step to the next range.
•To switch between AC voltage [ ] and DC voltage [ ],press
and hold the key for at least one second.
Indication when input exceeds the measurement range (Overow indication)
Displays [OF] or [-OF]
Zero-adjust Function
•The zero adjustment function compensates for sensor magnetization
and changes in current display over time.
•Before measuring DC current [ ],you must perform zero
adjustment by simultaneously pressing the and HOLD keys
while there is no input to the instrument.
•This function is only effective with measurement of DC current [ ].
Parts Names
MADE IN JAPAN
BATTERY: CR 2032
RATING :
1 15mVA 3V
MADE IN JAPAN
BATTERY: CR 2032
RATING :
1 15mVA 3V
RearFront
Jaw
Barrier
Operation grip
LCD Display
Rotary switch
key
HOLD key
(Press to hold the
display value.)
Test lead plug
Measurement
terminal Battery cover
Sleeves (Red)
(Black)
Test leads
Measurement Methods
Current Measurement
AC Current Measurement [ ]
1
OK NO
OK NO
2
OK NO
3
DC Current Measurement [ ]
Perform zero adjustment by
simultaneously pressing
12
Current
direction
3
Current direction
indicator
Voltage Measurement
AC Voltage Measurement [ ]
1 2 3
DC Voltage Measurement [ ]
NO
OK
123
Black(−) Red (+)
Red (+) Black(−)
Resistance Measurement [ ]
21 3 4
Continuity check [ ]
21 3 4
Specications
General Specications
Operating
environment Indoors, pollution degree 2,
altitude up to 2000 m (6562 ft.)
Operating
temperature
and humidity
0°C to 40°C (32°F to 104°F)
80% RH or less (no condensation)
Storage
temperature
and humidity
−10°C to 50°C (14°F to 122°F),
80% RH or less (no condensation)
Standards Safety: EN61010
EMC: EN61326
Power supply CR2032 Coin-shaped lithium battery ×1 (3 V DC)
Maximum rated power: 15 mVA
Continuous
operating time
3287: Approx. 25 hours, 3288: Approx. 60 hours,
3288-20: Approx. 35 hours
(continuous,unloaded)
Dimensions
Approx. 57W×180H×16D mm (2.24″W × 7.09″H ×
0.63″D)
Mass • 3287: Approx. 170 g (6.0 oz.)
• 3288, 3288-20: Approx. 150 g (5.3 oz.)
Product
warranty period
3 years
Accessories • CR2032 Coin-shaped lithium battery
• 9398 Carrying Case
• L9208 Test lead
•Instruction Manual
Option • 9209 Test Leads Holder
• L4933 Contact Pin Set
(Can be connected to the tip of the L9208,which
comes with the instrument.)
• L4934 Small Alligator Clip Set
(Can be connected to the tip of the L9208,which
comes with the instrument.)
Basic Specications
Maximum input
current
3287: 100 A AC
/DC continuous (ACA/DCA)
3288, 3288-20: 1000 A AC
/DC continuous
(ACA/DCA)
Maximum input
voltage
600 V AC/DC (ACV/DCV)
Overload
protection 600 V AC/DC (ACV/DCV)
250 V AC/DC (Ω/continuity)
Maximum
rated voltage
to earth
•Jaw
600 V AC (Measurement category III),
(Anticipated transient overvoltage: 6000 V)
•Voltage measurement terminal (ACV/DCV)
600 V AC (Measurement category II),
300 V AC (Measurement category III)
(Anticipated transient overvoltage: 4000 V)
AC
measurement
method
3288 : Average value measurement RMS method
3287, 3288-20: True RMS measurement method
Display update
rate 400 ms±25 ms
Crest factor
• 3287: 2.5 max
Current range: 150 A max., Voltage range: 1000 V max.
• 3288-20: 3 max.
Current range: 1000 A range is 2 max.,
Voltage range: 1.5 max.
Zero-display
range 5 counts or less (current measurement only)
Effects of
conductor
position
• 3287: within ±1.0%
• 3288, 3288-20: within ±2.0%
(At all positions around the sensor’s centerpoint reference)
Maximum
measurable
conductor
diameter
φ35 mm or less
Accuracy Specications
Conditions of
guaranteed
accuracy
•Guaranteed accuracy period: 1 year (Number of jaw
open/close cycles: 10,000 or less)
•Guaranteed accuracy period after adjustment
made by Hioki: 1 year
•Battery warning indicator is not lighting
•Temperature and humidity for guaranteed accuracy:
23°C±5°C (73.0°F±9.0°F), 80% RH or less (no
condensation)
•Temperature characteristic: 0°C to 40°C
Measurement accuracy × 0.1/°C is added
AC current measurement (ACA)
3287
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<20 Hz 20 Hz≤f<45 Hz
66 Hz<f≤1 kHz
10.00 A
100.00 A ±1.5%rdg.±5dgt. ±5.0%rdg.±5dgt. ±2.0%rdg.±5dgt.
3288
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<45 Hz, 66 Hz<f≤500 Hz
100.0 A
1000 A ±1.5%rdg.±5dgt. ±2.0%rdg.±5dgt.
3288-20
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<45 Hz, 66 Hz<f≤500 Hz
100.0 A
1000 A ±1.5%rdg.±5dgt. ±2.0%rdg.±5dgt.
DC current measurement (DCA)
3287
Range Accuracy
10.00 A
100.0 A ±1.5%rdg.±5dgt.
3288/3288-20
Range Accuracy
100.0 A
1000 A ±1.5%rdg.±5dgt.
AC voltage measurement (ACV)
Range
Accuracy guarantee range
Accuracy
Input impedance
30 Hz ≤f≤ 500 Hz
4.200 V
42.00 V
420.0 V
600 V
0.400 V to 4.199 V
4.00 V to 41.99 V
40.0 V to 419.9 V
400 V to 600 V
±2.3%rdg.±8dgt.
11 MΩ±5%
10 MΩ±5%
10 MΩ±5%
10 MΩ±5%
DC voltage measurement (DCV)
Range
Accuracy guarantee
range
Accuracy Input
impedance
420.0 mV
4.200 V
42.00 V
420.0 V
600 V
40.0 mV to 419.9 mV
0.400 V to 4.199 V
4.00 V to 41.99 V
40.0 V to 419.9 V
400 V to 600 V
±1.3%rdg.±4dgt.
100 M
Ω
or more
11 MΩ±5%
10 MΩ±5%
10 MΩ±5%
10 MΩ±5%
Resistance measurement (Ω)
Range
Accuracy guarantee
range
Accuracy Open terminal voltage
420.0
Ω
4.200 k
Ω
42.00 k
Ω
420.0 k
Ω
4.200 M
Ω
42.00 M
Ω
40.0
Ω
to 419.9
Ω
0.400 k
Ω
to 4.199 k
Ω
4.00 k
Ω
to 41.99 k
Ω
40.0 k
Ω
to 419.9 k
Ω
0.400 M
Ω
to 4.199 M
Ω
4.00 M
Ω
to 41.99 M
Ω
±2.0%rdg.±4dgt.
±2.0% rdg.±4dgt.
±2.0% rdg.±4dgt.
±2.0% rdg.±4dgt.
±5.0% rdg.±4dgt.
±10.0%rdg.±4dgt.
3.4 V or less
0.7 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
Continuity test
Range Accuracy Threshold level
(beep sound) Open terminal voltage
420.0 Ω±2.0%
rdg.± 6dgt. 50
Ω
±40
Ω
or less 3.4 V or less
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

Functions
Display will automatically turn off if the instrument is not used
for 30 min. (Auto power-saving function)
•The auto power save function is activated automatically when the
power is turned on. (Not possible to cancel)
•To resume instrument operation in the previous state,select the
“OFF” position with the rotary switch and then move the switch to
the desired function.
Automatically sets the measurement range to the most appropriate
range (Auto-range function)
Displays [AUTO]
To set the measurement range arbitrarily (Manual-range function)
•Power on the tester while holding down the or HOLD key to
select a manual range for measuring AC current [ ],DC current [
],AC voltage [ ],DC voltage [ ] or resistance [ ].
•Note that this function is not available for continuity testing.
Press the key to step to the next range.
•To switch between AC voltage [ ] and DC voltage [ ],press
and hold the key for at least one second.
Indication when input exceeds the measurement range (Overow indication)
Displays [OF] or [-OF]
Zero-adjust Function
•The zero adjustment function compensates for sensor magnetization
and changes in current display over time.
•Before measuring DC current [ ],you must perform zero
adjustment by simultaneously pressing the and HOLD keys
while there is no input to the instrument.
•This function is only effective with measurement of DC current [ ].
Parts Names
MADE IN JAPAN
BATTERY: CR 2032
RATING :
1 15mVA 3V
MADE IN JAPAN
BATTERY: CR 2032
RATING :
1 15mVA 3V
RearFront
Jaw
Barrier
Operation grip
LCD Display
Rotary switch
key
HOLD key
(Press to hold the
display value.)
Test lead plug
Measurement
terminal Battery cover
Sleeves (Red)
(Black)
Test leads
Measurement Methods
Current Measurement
AC Current Measurement [ ]
1
OK NO
OK NO
2
OK NO
3
DC Current Measurement [ ]
Perform zero adjustment by
simultaneously pressing
12
Current
direction
3
Current direction
indicator
Voltage Measurement
AC Voltage Measurement [ ]
1 2 3
DC Voltage Measurement [ ]
NO
OK
123
Black(−) Red (+)
Red (+) Black(−)
Resistance Measurement [ ]
21 3 4
Continuity check [ ]
21 3 4
Specications
General Specications
Operating
environment Indoors, pollution degree 2,
altitude up to 2000 m (6562 ft.)
Operating
temperature
and humidity
0°C to 40°C (32°F to 104°F)
80% RH or less (no condensation)
Storage
temperature
and humidity
−10°C to 50°C (14°F to 122°F),
80% RH or less (no condensation)
Standards Safety: EN61010
EMC: EN61326
Power supply CR2032 Coin-shaped lithium battery ×1 (3 V DC)
Maximum rated power: 15 mVA
Continuous
operating time
3287: Approx. 25 hours, 3288: Approx. 60 hours,
3288-20: Approx. 35 hours
(continuous,unloaded)
Dimensions
Approx. 57W×180H×16D mm (2.24″W × 7.09″H ×
0.63″D)
Mass • 3287: Approx. 170 g (6.0 oz.)
• 3288, 3288-20: Approx. 150 g (5.3 oz.)
Product
warranty period
3 years
Accessories • CR2032 Coin-shaped lithium battery
• 9398 Carrying Case
• L9208 Test lead
•Instruction Manual
Option • 9209 Test Leads Holder
• L4933 Contact Pin Set
(Can be connected to the tip of the L9208,which
comes with the instrument.)
• L4934 Small Alligator Clip Set
(Can be connected to the tip of the L9208,which
comes with the instrument.)
Basic Specications
Maximum input
current
3287: 100 A AC
/DC continuous (ACA/DCA)
3288, 3288-20: 1000 A AC
/DC continuous
(ACA/DCA)
Maximum input
voltage
600 V AC/DC (ACV/DCV)
Overload
protection 600 V AC/DC (ACV/DCV)
250 V AC/DC (Ω/continuity)
Maximum
rated voltage
to earth
•Jaw
600 V AC (Measurement category III),
(Anticipated transient overvoltage: 6000 V)
•Voltage measurement terminal (ACV/DCV)
600 V AC (Measurement category II),
300 V AC (Measurement category III)
(Anticipated transient overvoltage: 4000 V)
AC
measurement
method
3288 : Average value measurement RMS method
3287, 3288-20: True RMS measurement method
Display update
rate 400 ms±25 ms
Crest factor
• 3287: 2.5 max
Current range: 150 A max., Voltage range: 1000 V max.
• 3288-20: 3 max.
Current range: 1000 A range is 2 max.,
Voltage range: 1.5 max.
Zero-display
range 5 counts or less (current measurement only)
Effects of
conductor
position
• 3287: within ±1.0%
• 3288, 3288-20: within ±2.0%
(At all positions around the sensor’s centerpoint reference)
Maximum
measurable
conductor
diameter
φ35 mm or less
Accuracy Specications
Conditions of
guaranteed
accuracy
•Guaranteed accuracy period: 1 year (Number of jaw
open/close cycles: 10,000 or less)
•Guaranteed accuracy period after adjustment
made by Hioki: 1 year
•Battery warning indicator is not lighting
•Temperature and humidity for guaranteed accuracy:
23°C±5°C (73.0°F±9.0°F), 80% RH or less (no
condensation)
•Temperature characteristic: 0°C to 40°C
Measurement accuracy × 0.1/°C is added
AC current measurement (ACA)
3287
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<20 Hz 20 Hz≤f<45 Hz
66 Hz<f≤1 kHz
10.00 A
100.00 A ±1.5%rdg.±5dgt. ±5.0%rdg.±5dgt. ±2.0%rdg.±5dgt.
3288
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<45 Hz, 66 Hz<f≤500 Hz
100.0 A
1000 A ±1.5%rdg.±5dgt. ±2.0%rdg.±5dgt.
3288-20
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<45 Hz, 66 Hz<f≤500 Hz
100.0 A
1000 A ±1.5%rdg.±5dgt. ±2.0%rdg.±5dgt.
DC current measurement (DCA)
3287
Range Accuracy
10.00 A
100.0 A ±1.5%rdg.±5dgt.
3288/3288-20
Range Accuracy
100.0 A
1000 A ±1.5%rdg.±5dgt.
AC voltage measurement (ACV)
Range
Accuracy guarantee range
Accuracy
Input impedance
30 Hz ≤f≤ 500 Hz
4.200 V
42.00 V
420.0 V
600 V
0.400 V to 4.199 V
4.00 V to 41.99 V
40.0 V to 419.9 V
400 V to 600 V
±2.3%rdg.±8dgt.
11 MΩ±5%
10 MΩ±5%
10 MΩ±5%
10 MΩ±5%
DC voltage measurement (DCV)
Range
Accuracy guarantee
range
Accuracy Input
impedance
420.0 mV
4.200 V
42.00 V
420.0 V
600 V
40.0 mV to 419.9 mV
0.400 V to 4.199 V
4.00 V to 41.99 V
40.0 V to 419.9 V
400 V to 600 V
±1.3%rdg.±4dgt.
100 M
Ω
or more
11 MΩ±5%
10 MΩ±5%
10 MΩ±5%
10 MΩ±5%
Resistance measurement (Ω)
Range
Accuracy guarantee
range
Accuracy Open terminal voltage
420.0
Ω
4.200 k
Ω
42.00 k
Ω
420.0 k
Ω
4.200 M
Ω
42.00 M
Ω
40.0
Ω
to 419.9
Ω
0.400 k
Ω
to 4.199 k
Ω
4.00 k
Ω
to 41.99 k
Ω
40.0 k
Ω
to 419.9 k
Ω
0.400 M
Ω
to 4.199 M
Ω
4.00 M
Ω
to 41.99 M
Ω
±2.0%rdg.±4dgt.
±2.0% rdg.±4dgt.
±2.0% rdg.±4dgt.
±2.0% rdg.±4dgt.
±5.0% rdg.±4dgt.
±10.0%rdg.±4dgt.
3.4 V or less
0.7 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
Continuity test
Range Accuracy Threshold level
(beep sound) Open terminal voltage
420.0 Ω±2.0%
rdg.± 6dgt. 50
Ω
±40
Ω
or less 3.4 V or less
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Find Quality Products Online at: [e-mail]

Functions
Display will automatically turn off if the instrument is not used
for 30 min. (Auto power-saving function)
•The auto power save function is activated automatically when the
power is turned on. (Not possible to cancel)
•To resume instrument operation in the previous state,select the
“OFF” position with the rotary switch and then move the switch to
the desired function.
Automatically sets the measurement range to the most appropriate
range (Auto-range function)
Displays [AUTO]
To set the measurement range arbitrarily (Manual-range function)
•Power on the tester while holding down the or HOLD key to
select a manual range for measuring AC current [ ],DC current [
],AC voltage [ ],DC voltage [ ] or resistance [ ].
•Note that this function is not available for continuity testing.
Press the key to step to the next range.
•To switch between AC voltage [ ] and DC voltage [ ],press
and hold the key for at least one second.
Indication when input exceeds the measurement range (Overow indication)
Displays [OF] or [-OF]
Zero-adjust Function
•The zero adjustment function compensates for sensor magnetization
and changes in current display over time.
•Before measuring DC current [ ],you must perform zero
adjustment by simultaneously pressing the and HOLD keys
while there is no input to the instrument.
•This function is only effective with measurement of DC current [ ].
Parts Names
MADE IN JAPAN
BATTERY: CR 2032
RATING :
1 15mVA 3V
MADE IN JAPAN
BATTERY: CR 2032
RATING :
1 15mVA 3V
RearFront
Jaw
Barrier
Operation grip
LCD Display
Rotary switch
key
HOLD key
(Press to hold the
display value.)
Test lead plug
Measurement
terminal Battery cover
Sleeves (Red)
(Black)
Test leads
Measurement Methods
Current Measurement
AC Current Measurement [ ]
1
OK NO
OK NO
2
OK NO
3
DC Current Measurement [ ]
Perform zero adjustment by
simultaneously pressing
12
Current
direction
3
Current direction
indicator
Voltage Measurement
AC Voltage Measurement [ ]
1 2 3
DC Voltage Measurement [ ]
NO
OK
123
Black(−) Red (+)
Red (+) Black(−)
Resistance Measurement [ ]
21 3 4
Continuity check [ ]
21 3 4
Specications
General Specications
Operating
environment Indoors, pollution degree 2,
altitude up to 2000 m (6562 ft.)
Operating
temperature
and humidity
0°C to 40°C (32°F to 104°F)
80% RH or less (no condensation)
Storage
temperature
and humidity
−10°C to 50°C (14°F to 122°F),
80% RH or less (no condensation)
Standards Safety: EN61010
EMC: EN61326
Power supply CR2032 Coin-shaped lithium battery ×1 (3 V DC)
Maximum rated power: 15 mVA
Continuous
operating time
3287: Approx. 25 hours, 3288: Approx. 60 hours,
3288-20: Approx. 35 hours
(continuous,unloaded)
Dimensions
Approx. 57W×180H×16D mm (2.24″W × 7.09″H ×
0.63″D)
Mass • 3287: Approx. 170 g (6.0 oz.)
• 3288, 3288-20: Approx. 150 g (5.3 oz.)
Product
warranty period
3 years
Accessories • CR2032 Coin-shaped lithium battery
• 9398 Carrying Case
• L9208 Test lead
•Instruction Manual
Option • 9209 Test Leads Holder
• L4933 Contact Pin Set
(Can be connected to the tip of the L9208,which
comes with the instrument.)
• L4934 Small Alligator Clip Set
(Can be connected to the tip of the L9208,which
comes with the instrument.)
Basic Specications
Maximum input
current
3287: 100 A AC
/DC continuous (ACA/DCA)
3288, 3288-20: 1000 A AC
/DC continuous
(ACA/DCA)
Maximum input
voltage
600 V AC/DC (ACV/DCV)
Overload
protection 600 V AC/DC (ACV/DCV)
250 V AC/DC (Ω/continuity)
Maximum
rated voltage
to earth
•Jaw
600 V AC (Measurement category III),
(Anticipated transient overvoltage: 6000 V)
•Voltage measurement terminal (ACV/DCV)
600 V AC (Measurement category II),
300 V AC (Measurement category III)
(Anticipated transient overvoltage: 4000 V)
AC
measurement
method
3288 : Average value measurement RMS method
3287, 3288-20: True RMS measurement method
Display update
rate 400 ms±25 ms
Crest factor
• 3287: 2.5 max
Current range: 150 A max., Voltage range: 1000 V max.
• 3288-20: 3 max.
Current range: 1000 A range is 2 max.,
Voltage range: 1.5 max.
Zero-display
range 5 counts or less (current measurement only)
Effects of
conductor
position
• 3287: within ±1.0%
• 3288, 3288-20: within ±2.0%
(At all positions around the sensor’s centerpoint reference)
Maximum
measurable
conductor
diameter
φ35 mm or less
Accuracy Specications
Conditions of
guaranteed
accuracy
•Guaranteed accuracy period: 1 year (Number of jaw
open/close cycles: 10,000 or less)
•Guaranteed accuracy period after adjustment
made by Hioki: 1 year
•Battery warning indicator is not lighting
•Temperature and humidity for guaranteed accuracy:
23°C±5°C (73.0°F±9.0°F), 80% RH or less (no
condensation)
•Temperature characteristic: 0°C to 40°C
Measurement accuracy × 0.1/°C is added
AC current measurement (ACA)
3287
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<20 Hz 20 Hz≤f<45 Hz
66 Hz<f≤1 kHz
10.00 A
100.00 A ±1.5%rdg.±5dgt. ±5.0%rdg.±5dgt. ±2.0%rdg.±5dgt.
3288
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<45 Hz, 66 Hz<f≤500 Hz
100.0 A
1000 A ±1.5%rdg.±5dgt. ±2.0%rdg.±5dgt.
3288-20
Range Accuracy
45 Hz≤f≤66 Hz 10 Hz≤f<45 Hz, 66 Hz<f≤500 Hz
100.0 A
1000 A ±1.5%rdg.±5dgt. ±2.0%rdg.±5dgt.
DC current measurement (DCA)
3287
Range Accuracy
10.00 A
100.0 A ±1.5%rdg.±5dgt.
3288/3288-20
Range Accuracy
100.0 A
1000 A ±1.5%rdg.±5dgt.
AC voltage measurement (ACV)
Range
Accuracy guarantee range
Accuracy
Input impedance
30 Hz ≤f≤ 500 Hz
4.200 V
42.00 V
420.0 V
600 V
0.400 V to 4.199 V
4.00 V to 41.99 V
40.0 V to 419.9 V
400 V to 600 V
±2.3%rdg.±8dgt.
11 MΩ±5%
10 MΩ±5%
10 MΩ±5%
10 MΩ±5%
DC voltage measurement (DCV)
Range
Accuracy guarantee
range
Accuracy Input
impedance
420.0 mV
4.200 V
42.00 V
420.0 V
600 V
40.0 mV to 419.9 mV
0.400 V to 4.199 V
4.00 V to 41.99 V
40.0 V to 419.9 V
400 V to 600 V
±1.3%rdg.±4dgt.
100 M
Ω
or more
11 MΩ±5%
10 MΩ±5%
10 MΩ±5%
10 MΩ±5%
Resistance measurement (Ω)
Range
Accuracy guarantee
range
Accuracy Open terminal voltage
420.0
Ω
4.200 k
Ω
42.00 k
Ω
420.0 k
Ω
4.200 M
Ω
42.00 M
Ω
40.0
Ω
to 419.9
Ω
0.400 k
Ω
to 4.199 k
Ω
4.00 k
Ω
to 41.99 k
Ω
40.0 k
Ω
to 419.9 k
Ω
0.400 M
Ω
to 4.199 M
Ω
4.00 M
Ω
to 41.99 M
Ω
±2.0%rdg.±4dgt.
±2.0% rdg.±4dgt.
±2.0% rdg.±4dgt.
±2.0% rdg.±4dgt.
±5.0% rdg.±4dgt.
±10.0%rdg.±4dgt.
3.4 V or less
0.7 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
0.47 V (typ.) 3.4 V or less
Continuity test
Range Accuracy Threshold level
(beep sound) Open terminal voltage
420.0 Ω±2.0%
rdg.± 6dgt. 50
Ω
±40
Ω
or less 3.4 V or less
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Find Quality Products Online at: [e-mail]

CLAMP ON
AC/DC HiTESTER
Apr. 2016 Edition 1
Printed in Japan
3287C961-00 16-04H
3287
3288
3288-20
EN
Instruction Manual
Symbols afxed to the device
Precaution or hazard (See corresponding topic.)
Risk of electric shock
Protected throughout by double insulation or reinforced insulation
Device may be connected to or disconnected from a live conductor
Grounding
terminal DC (direct current) AC (alternating current)
Accuracy
We dene measurement tolerances in terms of rdg. (reading) and
dgt. (digit) values,with the following meanings:
rdg.
(reading or
displayed value)
The value currently being measured and
indicated on the measuring instrument.
dgt.
(resolution)
The smallest displayable unit on a digital measuring
instrument,i.e.,the input value that causes the digital
display to show a “1” as the least-signicant digit.
Measurement categories
This instrument’s current measurement part conforms to the safety
requirements for CAT III 600 V and the voltage measurement part
conforms to the safety requirements for CAT II 600 V,CAT III 300 V
measuring instruments.
Service entrance
Distribution panel
Service drop Internal wiring
Power meter
Fixed Installation
Outlet
CAT IV CAT III CAT II
DANGER
Measuring a location with a higher category number
than the measurement category indicated on this
device may result in a serious accident such as
electric shock.
To avoid electric shock, do not touch the portion
beyond the protective barrier during use.
Never apply voltage to the test leads when the
resistance and continuity functions are selected.
Doing so may damage the instrument and result in
bodily injury. To avoid electrical accidents, remove
power from the circuit before measuring.
WARNING
•To avoid electric shock,short circuits and damage
to the instrument,disconnect the test leads from the
measurement object before switching the rotary switch.
•To prevent electric shock,when measuring the voltage
of a power line use a test lead that satises the
following criteria:
•Conforms to safety standards IEC61010 or EN61010
•Of measurement category III or IV
•Its rated voltage is higher than the voltage to be measured
• The optional test leads for this instrument conform to the
safety standard EN61010. Use a test lead in accordance
with its dened measurement category and rated voltage.
•To avoid an electric shock,operate the instrument at
below a lower rated voltage between that indicated on
the instrument and on test leads.
WARNING
•Installing the instrument in inappropriate locations may
cause a malfunction of instrument or may give rise to
an accident. Avoid the following locations:
•Exposed to direct sunlight or high temperature
•Exposed to corrosive or combustible gases
• Exposed to a strong electromagnetic eld or
electrostatic charge
• Near induction heating systems (such as high-frequency
induction heating systems and IH cooking equipment)
•Susceptible to vibration
•Exposed to water,oil,chemicals,or solvents
•Exposed to high humidity or condensation
•Exposed to high quantities of dust particles
WARNING
•Since there is a risk of electric shock,check that the
insulation on the test lead are neither ripped nor torn,and
no metal conductor inside the wire are exposed before
using the instrument. If damaged,replace them with those
specied by our company.
•To prevent a short circuit accident,be sure to use the
test leads with the sleeves attached when performing
measurements in the CAT III measurement category.
•If the sleeves are inadvertently removed during
measurement,stop the measurement.
• With regard to the electricity supply,there are risks of
electric shock,heat generation, re, and arc ash due
to short circuits. If persons unfamiliar with electricity
measuring instrument are to use the instrument,another
person familiar with such instruments must supervise
operations.
•This instrument is measured on a live line. To prevent
electric shock,use appropriate protective insulation and
adhere to applicable laws and regulations.
•Handle and dispose of batteries in accordance with
local regulations.
CAUTION
•Do not place foreign objects between the jaw tips or
insert foreign objects into the gaps of the jaws (or exible
loop couplings). Doing so may worsen the performances
of the sensor or interfere with clamping action.
• Be careful to avoid dropping the instrument or otherwise
subjecting them to mechanical shock,which could
damage the jaw and adversely affect measurement.
Poor performance or damage from battery leakage
could result. Observe the cautions listed below:
•Do not use batteries after their recommended expiry date.
•Do not allow weak batteries to remain in the instrument.
• Replace batteries only with the specied type.
•Remove the batteries from the instrument if it is to be
stored for a long time.
•The indicator lights up when the remaining battery
capacity is low. In this case,the instrument's reliability is
not guaranteed. Replace the battery immediately.
•To avoid battery depletion,turn the rotary switch OFF
after use (the auto power save feature consumes a small
amount of current).
Inspection Before Measurement
•Verify that the instrument operates normally to ensure that no
damage occurred during storage or shipping. If you nd any
damage,contact your authorized Hioki distributor or reseller.
•If damage is suspected,check the section below before contacting
your authorized Hioki distributor or reseller.
(1) Check that the test lead is not broken.
Replace with the specied L9208 Test Lead.
(2) Check that the resistance measurement and continuity test
operates normally.
Have the instrument repaired by the your authorized Hioki
distributor or reseller. The instrument may have been subject to
a voltage of greater than 600 V during resistance measurement
or continuity testing.
(3) Check that the battery voltage is not low.
Replace the batteries.
Maintenance/Inspection
Cleaning
• Measurements are degraded by dirt on the mating surfaces of the jaw
,so keep the surfaces clean by gently wiping with a soft,dry cloth.
•To clean the device,wipe it gently with a soft cloth moistened with
water or mild detergent.
• Wipe the LCD display gently with a soft,dry cloth.
Insert/Replace Batteries
Necessary tool: Phillips screwdriver and CR2032 Coin-shaped lithium battery
NO
OK
NO
OK
1 2 34
Do not turn the adjustment screw inside the battery case. Doing
so will cause the instrument to report abnormal measured values.
CALIFORNIA,USA ONLY
Perchlorate Material - special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate
Warranty
Warranty malfunctions occurring under conditions of normal use in
conformity with the Instruction Manual and Product Precautionary
Markings will be repaired free of charge. This warranty is valid for a
period of three (3) years from the date of purchase. Please contact
the distributor from which you purchased the product for further
information on warranty provisions.
Introduction
Thank you for purchasing the Hioki 3287/3288/3288-20 AC Clamp
Meter. To obtain maximum performance from the instrument,please
read this manual rst,and keep it handy for future reference.
3288 Average value measurement RMS conversion model
3287
3288-20 True RMS measurement model
Safety Notes
This instrument is designed to conform to IEC 61010 Safety
Standards,and has been thoroughly tested for safety prior to
shipment. However,using the instrument in a way not described in
this manual may negate the provided safety features. Before using
the instrument,be certain to carefully read the following safety notes.
Notation
In this document,the risk seriousness and the hazard levels are
classied as follows.
DANGER Imminent risk of operator death or serious injury
WARNING Potential for operator death or serious injury
CAUTION Potential for minor operator injury or device
damage or malfunction
Risk of electric shock
Prohibited actions
Actions that must be performed
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

CLAMP ON
AC/DC HiTESTER
Apr. 2016 Edition 1
Printed in Japan
3287C961-00 16-04H
3287
3288
3288-20
EN
Instruction Manual
Symbols afxed to the device
Precaution or hazard (See corresponding topic.)
Risk of electric shock
Protected throughout by double insulation or reinforced insulation
Device may be connected to or disconnected from a live conductor
Grounding
terminal DC (direct current) AC (alternating current)
Accuracy
We dene measurement tolerances in terms of rdg. (reading) and
dgt. (digit) values,with the following meanings:
rdg.
(reading or
displayed value)
The value currently being measured and
indicated on the measuring instrument.
dgt.
(resolution)
The smallest displayable unit on a digital measuring
instrument,i.e.,the input value that causes the digital
display to show a “1” as the least-signicant digit.
Measurement categories
This instrument’s current measurement part conforms to the safety
requirements for CAT III 600 V and the voltage measurement part
conforms to the safety requirements for CAT II 600 V,CAT III 300 V
measuring instruments.
Service entrance
Distribution panel
Service drop Internal wiring
Power meter
Fixed Installation
Outlet
CAT IV CAT III CAT II
DANGER
Measuring a location with a higher category number
than the measurement category indicated on this
device may result in a serious accident such as
electric shock.
To avoid electric shock, do not touch the portion
beyond the protective barrier during use.
Never apply voltage to the test leads when the
resistance and continuity functions are selected.
Doing so may damage the instrument and result in
bodily injury. To avoid electrical accidents, remove
power from the circuit before measuring.
WARNING
•To avoid electric shock,short circuits and damage
to the instrument,disconnect the test leads from the
measurement object before switching the rotary switch.
•To prevent electric shock,when measuring the voltage
of a power line use a test lead that satises the
following criteria:
•Conforms to safety standards IEC61010 or EN61010
•Of measurement category III or IV
•Its rated voltage is higher than the voltage to be measured
• The optional test leads for this instrument conform to the
safety standard EN61010. Use a test lead in accordance
with its dened measurement category and rated voltage.
•To avoid an electric shock,operate the instrument at
below a lower rated voltage between that indicated on
the instrument and on test leads.
WARNING
•Installing the instrument in inappropriate locations may
cause a malfunction of instrument or may give rise to
an accident. Avoid the following locations:
•Exposed to direct sunlight or high temperature
•Exposed to corrosive or combustible gases
• Exposed to a strong electromagnetic eld or
electrostatic charge
• Near induction heating systems (such as high-frequency
induction heating systems and IH cooking equipment)
•Susceptible to vibration
•Exposed to water,oil,chemicals,or solvents
•Exposed to high humidity or condensation
•Exposed to high quantities of dust particles
WARNING
•Since there is a risk of electric shock,check that the
insulation on the test lead are neither ripped nor torn,and
no metal conductor inside the wire are exposed before
using the instrument. If damaged,replace them with those
specied by our company.
•To prevent a short circuit accident,be sure to use the
test leads with the sleeves attached when performing
measurements in the CAT III measurement category.
•If the sleeves are inadvertently removed during
measurement,stop the measurement.
• With regard to the electricity supply,there are risks of
electric shock,heat generation, re, and arc ash due
to short circuits. If persons unfamiliar with electricity
measuring instrument are to use the instrument,another
person familiar with such instruments must supervise
operations.
•This instrument is measured on a live line. To prevent
electric shock,use appropriate protective insulation and
adhere to applicable laws and regulations.
•Handle and dispose of batteries in accordance with
local regulations.
CAUTION
•Do not place foreign objects between the jaw tips or
insert foreign objects into the gaps of the jaws (or exible
loop couplings). Doing so may worsen the performances
of the sensor or interfere with clamping action.
• Be careful to avoid dropping the instrument or otherwise
subjecting them to mechanical shock,which could
damage the jaw and adversely affect measurement.
Poor performance or damage from battery leakage
could result. Observe the cautions listed below:
•Do not use batteries after their recommended expiry date.
•Do not allow weak batteries to remain in the instrument.
• Replace batteries only with the specied type.
•Remove the batteries from the instrument if it is to be
stored for a long time.
•The indicator lights up when the remaining battery
capacity is low. In this case,the instrument's reliability is
not guaranteed. Replace the battery immediately.
•To avoid battery depletion,turn the rotary switch OFF
after use (the auto power save feature consumes a small
amount of current).
Inspection Before Measurement
•Verify that the instrument operates normally to ensure that no
damage occurred during storage or shipping. If you nd any
damage,contact your authorized Hioki distributor or reseller.
•If damage is suspected,check the section below before contacting
your authorized Hioki distributor or reseller.
(1) Check that the test lead is not broken.
Replace with the specied L9208 Test Lead.
(2) Check that the resistance measurement and continuity test
operates normally.
Have the instrument repaired by the your authorized Hioki
distributor or reseller. The instrument may have been subject to
a voltage of greater than 600 V during resistance measurement
or continuity testing.
(3) Check that the battery voltage is not low.
Replace the batteries.
Maintenance/Inspection
Cleaning
• Measurements are degraded by dirt on the mating surfaces of the jaw
,so keep the surfaces clean by gently wiping with a soft,dry cloth.
•To clean the device,wipe it gently with a soft cloth moistened with
water or mild detergent.
• Wipe the LCD display gently with a soft,dry cloth.
Insert/Replace Batteries
Necessary tool: Phillips screwdriver and CR2032 Coin-shaped lithium battery
NO
OK
NO
OK
1 2 34
Do not turn the adjustment screw inside the battery case. Doing
so will cause the instrument to report abnormal measured values.
CALIFORNIA,USA ONLY
Perchlorate Material - special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate
Warranty
Warranty malfunctions occurring under conditions of normal use in
conformity with the Instruction Manual and Product Precautionary
Markings will be repaired free of charge. This warranty is valid for a
period of three (3) years from the date of purchase. Please contact
the distributor from which you purchased the product for further
information on warranty provisions.
Introduction
Thank you for purchasing the Hioki 3287/3288/3288-20 AC Clamp
Meter. To obtain maximum performance from the instrument,please
read this manual rst,and keep it handy for future reference.
3288 Average value measurement RMS conversion model
3287
3288-20 True RMS measurement model
Safety Notes
This instrument is designed to conform to IEC 61010 Safety
Standards,and has been thoroughly tested for safety prior to
shipment. However,using the instrument in a way not described in
this manual may negate the provided safety features. Before using
the instrument,be certain to carefully read the following safety notes.
Notation
In this document,the risk seriousness and the hazard levels are
classied as follows.
DANGER Imminent risk of operator death or serious injury
WARNING Potential for operator death or serious injury
CAUTION Potential for minor operator injury or device
damage or malfunction
Risk of electric shock
Prohibited actions
Actions that must be performed
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

CLAMP ON
AC/DC HiTESTER
Apr. 2016 Edition 1
Printed in Japan
3287C961-00 16-04H
3287
3288
3288-20
EN
Instruction Manual
Symbols afxed to the device
Precaution or hazard (See corresponding topic.)
Risk of electric shock
Protected throughout by double insulation or reinforced insulation
Device may be connected to or disconnected from a live conductor
Grounding
terminal DC (direct current) AC (alternating current)
Accuracy
We dene measurement tolerances in terms of rdg. (reading) and
dgt. (digit) values,with the following meanings:
rdg.
(reading or
displayed value)
The value currently being measured and
indicated on the measuring instrument.
dgt.
(resolution)
The smallest displayable unit on a digital measuring
instrument,i.e.,the input value that causes the digital
display to show a “1” as the least-signicant digit.
Measurement categories
This instrument’s current measurement part conforms to the safety
requirements for CAT III 600 V and the voltage measurement part
conforms to the safety requirements for CAT II 600 V,CAT III 300 V
measuring instruments.
Service entrance
Distribution panel
Service drop Internal wiring
Power meter
Fixed Installation
Outlet
CAT IV CAT III CAT II
DANGER
Measuring a location with a higher category number
than the measurement category indicated on this
device may result in a serious accident such as
electric shock.
To avoid electric shock, do not touch the portion
beyond the protective barrier during use.
Never apply voltage to the test leads when the
resistance and continuity functions are selected.
Doing so may damage the instrument and result in
bodily injury. To avoid electrical accidents, remove
power from the circuit before measuring.
WARNING
•To avoid electric shock,short circuits and damage
to the instrument,disconnect the test leads from the
measurement object before switching the rotary switch.
•To prevent electric shock,when measuring the voltage
of a power line use a test lead that satises the
following criteria:
•Conforms to safety standards IEC61010 or EN61010
•Of measurement category III or IV
•Its rated voltage is higher than the voltage to be measured
• The optional test leads for this instrument conform to the
safety standard EN61010. Use a test lead in accordance
with its dened measurement category and rated voltage.
•To avoid an electric shock,operate the instrument at
below a lower rated voltage between that indicated on
the instrument and on test leads.
WARNING
•Installing the instrument in inappropriate locations may
cause a malfunction of instrument or may give rise to
an accident. Avoid the following locations:
•Exposed to direct sunlight or high temperature
•Exposed to corrosive or combustible gases
• Exposed to a strong electromagnetic eld or
electrostatic charge
• Near induction heating systems (such as high-frequency
induction heating systems and IH cooking equipment)
•Susceptible to vibration
•Exposed to water,oil,chemicals,or solvents
•Exposed to high humidity or condensation
•Exposed to high quantities of dust particles
WARNING
•Since there is a risk of electric shock,check that the
insulation on the test lead are neither ripped nor torn,and
no metal conductor inside the wire are exposed before
using the instrument. If damaged,replace them with those
specied by our company.
•To prevent a short circuit accident,be sure to use the
test leads with the sleeves attached when performing
measurements in the CAT III measurement category.
•If the sleeves are inadvertently removed during
measurement,stop the measurement.
• With regard to the electricity supply,there are risks of
electric shock,heat generation, re, and arc ash due
to short circuits. If persons unfamiliar with electricity
measuring instrument are to use the instrument,another
person familiar with such instruments must supervise
operations.
•This instrument is measured on a live line. To prevent
electric shock,use appropriate protective insulation and
adhere to applicable laws and regulations.
•Handle and dispose of batteries in accordance with
local regulations.
CAUTION
•Do not place foreign objects between the jaw tips or
insert foreign objects into the gaps of the jaws (or exible
loop couplings). Doing so may worsen the performances
of the sensor or interfere with clamping action.
• Be careful to avoid dropping the instrument or otherwise
subjecting them to mechanical shock,which could
damage the jaw and adversely affect measurement.
Poor performance or damage from battery leakage
could result. Observe the cautions listed below:
•Do not use batteries after their recommended expiry date.
•Do not allow weak batteries to remain in the instrument.
• Replace batteries only with the specied type.
•Remove the batteries from the instrument if it is to be
stored for a long time.
•The indicator lights up when the remaining battery
capacity is low. In this case,the instrument's reliability is
not guaranteed. Replace the battery immediately.
•To avoid battery depletion,turn the rotary switch OFF
after use (the auto power save feature consumes a small
amount of current).
Inspection Before Measurement
•Verify that the instrument operates normally to ensure that no
damage occurred during storage or shipping. If you nd any
damage,contact your authorized Hioki distributor or reseller.
•If damage is suspected,check the section below before contacting
your authorized Hioki distributor or reseller.
(1) Check that the test lead is not broken.
Replace with the specied L9208 Test Lead.
(2) Check that the resistance measurement and continuity test
operates normally.
Have the instrument repaired by the your authorized Hioki
distributor or reseller. The instrument may have been subject to
a voltage of greater than 600 V during resistance measurement
or continuity testing.
(3) Check that the battery voltage is not low.
Replace the batteries.
Maintenance/Inspection
Cleaning
• Measurements are degraded by dirt on the mating surfaces of the jaw
,so keep the surfaces clean by gently wiping with a soft,dry cloth.
•To clean the device,wipe it gently with a soft cloth moistened with
water or mild detergent.
• Wipe the LCD display gently with a soft,dry cloth.
Insert/Replace Batteries
Necessary tool: Phillips screwdriver and CR2032 Coin-shaped lithium battery
NO
OK
NO
OK
1 2 34
Do not turn the adjustment screw inside the battery case. Doing
so will cause the instrument to report abnormal measured values.
CALIFORNIA,USA ONLY
Perchlorate Material - special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate
Warranty
Warranty malfunctions occurring under conditions of normal use in
conformity with the Instruction Manual and Product Precautionary
Markings will be repaired free of charge. This warranty is valid for a
period of three (3) years from the date of purchase. Please contact
the distributor from which you purchased the product for further
information on warranty provisions.
Introduction
Thank you for purchasing the Hioki 3287/3288/3288-20 AC Clamp
Meter. To obtain maximum performance from the instrument,please
read this manual rst,and keep it handy for future reference.
3288 Average value measurement RMS conversion model
3287
3288-20 True RMS measurement model
Safety Notes
This instrument is designed to conform to IEC 61010 Safety
Standards,and has been thoroughly tested for safety prior to
shipment. However,using the instrument in a way not described in
this manual may negate the provided safety features. Before using
the instrument,be certain to carefully read the following safety notes.
Notation
In this document,the risk seriousness and the hazard levels are
classied as follows.
DANGER Imminent risk of operator death or serious injury
WARNING Potential for operator death or serious injury
CAUTION Potential for minor operator injury or device
damage or malfunction
Risk of electric shock
Prohibited actions
Actions that must be performed
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

CLAMP ON
AC/DC HiTESTER
Apr. 2016 Edition 1
Printed in Japan
3287C961-00 16-04H
3287
3288
3288-20
EN
Instruction Manual
Symbols afxed to the device
Precaution or hazard (See corresponding topic.)
Risk of electric shock
Protected throughout by double insulation or reinforced insulation
Device may be connected to or disconnected from a live conductor
Grounding
terminal DC (direct current) AC (alternating current)
Accuracy
We dene measurement tolerances in terms of rdg. (reading) and
dgt. (digit) values,with the following meanings:
rdg.
(reading or
displayed value)
The value currently being measured and
indicated on the measuring instrument.
dgt.
(resolution)
The smallest displayable unit on a digital measuring
instrument,i.e.,the input value that causes the digital
display to show a “1” as the least-signicant digit.
Measurement categories
This instrument’s current measurement part conforms to the safety
requirements for CAT III 600 V and the voltage measurement part
conforms to the safety requirements for CAT II 600 V,CAT III 300 V
measuring instruments.
Service entrance
Distribution panel
Service drop Internal wiring
Power meter
Fixed Installation
Outlet
CAT IV CAT III CAT II
DANGER
Measuring a location with a higher category number
than the measurement category indicated on this
device may result in a serious accident such as
electric shock.
To avoid electric shock, do not touch the portion
beyond the protective barrier during use.
Never apply voltage to the test leads when the
resistance and continuity functions are selected.
Doing so may damage the instrument and result in
bodily injury. To avoid electrical accidents, remove
power from the circuit before measuring.
WARNING
•To avoid electric shock,short circuits and damage
to the instrument,disconnect the test leads from the
measurement object before switching the rotary switch.
•To prevent electric shock,when measuring the voltage
of a power line use a test lead that satises the
following criteria:
•Conforms to safety standards IEC61010 or EN61010
•Of measurement category III or IV
•Its rated voltage is higher than the voltage to be measured
• The optional test leads for this instrument conform to the
safety standard EN61010. Use a test lead in accordance
with its dened measurement category and rated voltage.
•To avoid an electric shock,operate the instrument at
below a lower rated voltage between that indicated on
the instrument and on test leads.
WARNING
•Installing the instrument in inappropriate locations may
cause a malfunction of instrument or may give rise to
an accident. Avoid the following locations:
•Exposed to direct sunlight or high temperature
•Exposed to corrosive or combustible gases
• Exposed to a strong electromagnetic eld or
electrostatic charge
• Near induction heating systems (such as high-frequency
induction heating systems and IH cooking equipment)
•Susceptible to vibration
•Exposed to water,oil,chemicals,or solvents
•Exposed to high humidity or condensation
•Exposed to high quantities of dust particles
WARNING
•Since there is a risk of electric shock,check that the
insulation on the test lead are neither ripped nor torn,and
no metal conductor inside the wire are exposed before
using the instrument. If damaged,replace them with those
specied by our company.
•To prevent a short circuit accident,be sure to use the
test leads with the sleeves attached when performing
measurements in the CAT III measurement category.
•If the sleeves are inadvertently removed during
measurement,stop the measurement.
• With regard to the electricity supply,there are risks of
electric shock,heat generation, re, and arc ash due
to short circuits. If persons unfamiliar with electricity
measuring instrument are to use the instrument,another
person familiar with such instruments must supervise
operations.
•This instrument is measured on a live line. To prevent
electric shock,use appropriate protective insulation and
adhere to applicable laws and regulations.
•Handle and dispose of batteries in accordance with
local regulations.
CAUTION
•Do not place foreign objects between the jaw tips or
insert foreign objects into the gaps of the jaws (or exible
loop couplings). Doing so may worsen the performances
of the sensor or interfere with clamping action.
• Be careful to avoid dropping the instrument or otherwise
subjecting them to mechanical shock,which could
damage the jaw and adversely affect measurement.
Poor performance or damage from battery leakage
could result. Observe the cautions listed below:
•Do not use batteries after their recommended expiry date.
•Do not allow weak batteries to remain in the instrument.
• Replace batteries only with the specied type.
•Remove the batteries from the instrument if it is to be
stored for a long time.
•The indicator lights up when the remaining battery
capacity is low. In this case,the instrument's reliability is
not guaranteed. Replace the battery immediately.
•To avoid battery depletion,turn the rotary switch OFF
after use (the auto power save feature consumes a small
amount of current).
Inspection Before Measurement
•Verify that the instrument operates normally to ensure that no
damage occurred during storage or shipping. If you nd any
damage,contact your authorized Hioki distributor or reseller.
•If damage is suspected,check the section below before contacting
your authorized Hioki distributor or reseller.
(1) Check that the test lead is not broken.
Replace with the specied L9208 Test Lead.
(2) Check that the resistance measurement and continuity test
operates normally.
Have the instrument repaired by the your authorized Hioki
distributor or reseller. The instrument may have been subject to
a voltage of greater than 600 V during resistance measurement
or continuity testing.
(3) Check that the battery voltage is not low.
Replace the batteries.
Maintenance/Inspection
Cleaning
• Measurements are degraded by dirt on the mating surfaces of the jaw
,so keep the surfaces clean by gently wiping with a soft,dry cloth.
•To clean the device,wipe it gently with a soft cloth moistened with
water or mild detergent.
• Wipe the LCD display gently with a soft,dry cloth.
Insert/Replace Batteries
Necessary tool: Phillips screwdriver and CR2032 Coin-shaped lithium battery
NO
OK
NO
OK
1 2 34
Do not turn the adjustment screw inside the battery case. Doing
so will cause the instrument to report abnormal measured values.
CALIFORNIA,USA ONLY
Perchlorate Material - special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate
Warranty
Warranty malfunctions occurring under conditions of normal use in
conformity with the Instruction Manual and Product Precautionary
Markings will be repaired free of charge. This warranty is valid for a
period of three (3) years from the date of purchase. Please contact
the distributor from which you purchased the product for further
information on warranty provisions.
Introduction
Thank you for purchasing the Hioki 3287/3288/3288-20 AC Clamp
Meter. To obtain maximum performance from the instrument,please
read this manual rst,and keep it handy for future reference.
3288 Average value measurement RMS conversion model
3287
3288-20 True RMS measurement model
Safety Notes
This instrument is designed to conform to IEC 61010 Safety
Standards,and has been thoroughly tested for safety prior to
shipment. However,using the instrument in a way not described in
this manual may negate the provided safety features. Before using
the instrument,be certain to carefully read the following safety notes.
Notation
In this document,the risk seriousness and the hazard levels are
classied as follows.
DANGER Imminent risk of operator death or serious injury
WARNING Potential for operator death or serious injury
CAUTION Potential for minor operator injury or device
damage or malfunction
Risk of electric shock
Prohibited actions
Actions that must be performed
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]