Mastech MS8265 Assembly instructions

MS8265
DIGITAL MULTIMETER
OPERATOR'S
INSTRUCTION MANUAL
MS8265
ON/OFF
HOLD LIGHT
10A
COM
FUSED,10A MAX
RESETTABLE
750V
1000V
MAX
600V CAT III
1000V CAT II
hFE mA
F
Hz
10
200m
200m 2m
10 hFE
200m
2
20
200
1000
750
200
20
2
20
200M
200K
20K
2K
200
200μ
20μ
2μ
200n
20n
2m
20M
2M
KHz

1. GENERAL INSTRUCTIONS.......................1
1.1 Precaution safety measures......................1
1.1.1 Preliminary......................................1
1.1.2 During use........................................2
1.1.3 Symbols...........................................4
1.1.4 Instructions......................................5
1.2 Protection mechanisms............................6
2. DESCRIPTION...........................................6
2.1 Instrument Familiarization.........................6
2.2 LCD Display..............................................7
2.3 Keypad.....................................................8
2.4 Terminals..................................................9
2.5 Accessories..............................................9
3. FUNCTION DESCRIPTION......................10
3.1 General Functions..................................10
3.1.1Misconnection Alarm........................10
3.1.2 ..........11
3.1.3 Battery saver........
3.2 Measurement Functions
DATA HOLD mode................
..........................11
....................11
3.2.5 Capacitance measurement
3.2.6 Transistor measurement...
3.2.7 Frequency measurement...............17
3.2.8 Current measurement........
4. TECHNICAL SPECIFICATIONS
4.1 General specifications
4.2 Measurement specifications
4.2.1 DC Voltage
4.2.2 AC Voltage
4.2.3 Frequency......................................21
4.2.4 Resistance
4.2.5 Diode Test...........
4.2.6 Continuity Check
4.2.7 Transistor
4.2.8 Capacitance
4.2.9 DC current
4.2.10 AC current..
5. MAINTENANCE
5.1 General Maintenance
5.2 Battery Replacement
............16
.............17
............18
..............19
............................19
...................20
....................................20
....................................20
....................................21
..........................22
...........................22
........................................22
...................................22
.....................................23
..................................23
.....................................24
............................24
..............................25
3.2.1 AC and DC
Voltage measurement................11
CONTENTS CONTENTS
3.2.2 Resistance measurement...............12
3.2.3 Diode Test......................................14
3.2.4 Continuity Check............................15

01 02
1. General Instructions
This instrument complies with IEC 1010-1 (61010
-1@IEC: 2001), CAT. II 1000V and CAT. III 600V
over voltage standards. See Specifications.
To get the best service from this instrument, read
carefully this user's manual and respect the
detailed safety precautions.
International symbols used on the Meter and in this
manual are explained in chapter 1.1.3
1.1 Precautions Safety Measures
Measurement category III is for measurements
performed in the building installation.
NOTE: Examples are measurements on distribution
boards, circuit-breakers, wiring, including cables,
bus-bars, junction boxes, switches, socket-outlets
in the fixed installation, and equipment for industrial
use and some other equipment, for example,
stationary motors with permanent connection to the
fixed installation.
Measurement category II is for measurements
performed on circuits directly connected to the low
voltage installation.
NOTE: Examples are measurements on household
appliances, portable tools and similar equipment.
Measurement category I is for measurements
performed on circuits not directly connected to MAINS.
NOTE: Examples are measurements on circuits not
derived from MAINS, and specially protected (internal)
*
*
*
MAINS derived circuits. In the latter case, transient
stresses are variable; for that reason, requires that the
transient withstand capability of the equipment is made
known to the user.
1.1.1 Preliminary
*When using this Multimeter, the user must observe all
normal safety rules concerning:
– protection against the dangers of electric current.
– protection of the Multimeter against misuse.
* For your own safety, only use the test probes supplied
with the instrument. Before use, check that they are
in good condition.
*If the meter is used near noise generating equipment,
be aware that display may become unstable or indicate
large errors.
*Do not use the meter or test leads if they look damaged.
*Use the meter only as specified in this manual;
otherwise, the protection provided by the meter may
be impaired.
*Use extreme caution when working around bare
conductors or bus bars.
*Do not operate the meter around explosive gas, vapor,
or dust.
*Verify a Meter's operation by measuring a known
voltage. Do not use the Meter if it operates abnormally.
Protection may be impaired. When in doubt, have the
Meter serviced.
*Uses the proper terminals, function, and range for
your measurements.
*When the range of the value to be measured is
unknown, check that the range initially set on the
multimeter is the highest possible or, wherever
possible, choose the autoranging mode.
1.1.2 During use

03 04
*To avoid damages to the instrument, do not exceed
the maximum limits of the input values shown in the
technical specification tables.
When the multimeter is linked to measurement circuits,
do not touch unused terminals.
Caution when working with voltages above 60Vdc or
30Vac rms. Such voltages pose a shock hazard.
When using the probes, keep your fingers behind the
finger guards.
When making connections, connect the common test
lead before connecting the live test lead; when
disconnecting, disconnect the live test lead before
disconnecting the common test lead.
Before changing functions, disconnect the test leads
from the circuit under test.
For all dc functions, to avoid the risk of shock due to
possible improper reading, verify the presence of any
AC Voltages by first using the ac function. Then select
a DC Voltage range equal to or greater than the ac range.
Disconnect circuits power and discharge all
high-voltage capacitors before testing resistance,
continuity, diodes, or capacitance.
Never perform resistance or continuity measurements
on live circuits.
Before measuring current, check the meter's fuse
and turn off power to the circuit before connecting the
meter to the circuit.
In TV repair work, or when carrying out measurements
on power switching circuits, remember that high
amplitude voltage pulses at the test points can damage
the multimeter. Use of a TV filter will attenuate any
such pulses.
*
*
*
*
*
*
*
*
*
*
*Use the 9V NEDA battery, properly installed in the
Meter's battery case, to power the Meter.
*Replace the battery as soon as the battery indicator
( ) appears. With a low battery, the Meter might
produce false readings that can lead to electric shock
and personal injury.
*Do not measure voltages above 600V in Category III,
or 1000V in Category II installations.
*Do not operate the Meter with the case
(or part of the case) removed.
Symbols used in this manual and on the instrument:
1.1.3 Symbols:
Caution: refer to the instruction manual.
Incorrect use may result in damage to the
device or its components.
AC (Alternating Current)
DC (Direct Current)
Earth ground
Double insulated
Fuse
Conforms to European Union directives
DC (Direct Current) or AC (Alternating Current)

05 06
* Any adjustment, maintenance or repair work carried
out on the meter while it is live should be carried out
only by appropriately qualified personnel, after
having taken into account the instructions in this
present manual.
* A "qualified person" is someone who is familiar with
the installation, construction and operation of the
equipment and the hazards involved. He is trained
and authorized to energize and de-energize circuits
and equipment in accordance with established
practices.
* When the instrument is opened up, remember that
some internal capacitors can retain a dangerous
potential even after the instrument is switched off.
*If any faults or abnormalities are observed, take the
instrument out of service and ensure that it cannot
be used until it has been checked out.
*If the meter is not going to be used for a long time,
take out the battery and do not store the meter in
high temperature or high humidity environment.
* Fused by the resettable fuse (F400mA/250V) during
capacitance, temperature, mA and hFE
measurements.
A PTC resistor protects against permanent over
voltages of up to 250V during resistance, Frequency,
continuity and diode test measurements.
*
1.2 Protection mechanisms
2. Description
2.1 Instrument Familiarization
1. LCD display 2. Keypad
3. Rotary switch 4. Terminals
* Remove test leads from the Meter before opening
the Meter case or battery cover.
* When servicing the Meter, use only specified
replacement parts.
* Before opening up the instrument, always disconnect
from all sources of electric current and make sure
you are not charged with static electricity, which may
destroy internal components.
1.1.4 Instructions
2
1
3
4
MS8265
ON/OFF
HOLD LIGHT
10A
COM
FUSED,10A MAX
RESETTABLE
750V
1000V
MAX
600V CAT III
1000V CAT II
hFE mA
F
Hz
10
200m
200m 2m
10 hFE
200m
2
20
200
1000
750
200
20
2
20
200M
200K
20K
2K
200
200μ
20μ
2μ
200n
20n
2m
20M
2M
KHz

07 08
See Table 1 indicated for information about the LCD
display.
2.2 LCD Display
Figure 1.Display
Table 1. Display Symbols
Meaning
Symbol
The battery is low.
Warning: To avoid false readings, which
could lead to possible electric shock or
personal injury, replace the battery as soon
as the battery indicator appears.
Indicates negative readings.
The Meter is in the Diode Test mode
Table 1. Display Symbols (continued)
The Meter is in the Continuity Check mode
The Meter is in the Data Hold mode
V:
mV:
Volts. The unit of voltage.
Millivolt. 1x10 or 0.001 volts.
-3
A:
mA:
μA:
Amperes (amps). The unit of current.
Milliamp. 1x10 or 0.001 amperes.
Microamp. 1x10 or 0.000001 amperes
-3
-6
k :
M :
Ω:
Ω
Ω
Ohm. The unit of resistance.
Kilohm. 1x10 or 1000 ohms.
Megohm. 1x10 or 1,000,000 ohms.
3
6
F:
:
n :
µF
F
Farad. The unit of capacitance.
Microfarad.1x10 or 0.000001 farads.
Nanofarad. 1x10 or 0.000000001 farads
-6
-9
See Table 2 indicated for information about the keypad
operations.
2.3 Keypad
Table 2. Keypad
Function
Key
Any switch position
Operation performed
turn the meter on or off
Press HOLD to enter and
exit the Data Hold mode.
Any switch position
V, mV
A, mA,
µA
Ω, ΚΩ,
ΜΩ
µF, nF
HOLD
ON/OFF
Any switch position
Press LIGHT to turn the
backlight on. After about
5 seconds, the backlight
is auto-off.
LIGHT
The Meter is in the Transistor Test mode
hFE
kHz kHz: Kilohertz. 1x10³ or 1000 hertz.

09 10
See Table 4 indicated for information about the terminals.
2.4 Terminals
Table 4. Terminals
Description
Terminal
Return terminal for all measurements.
(Receiving the black test lead or the “com”
plug of the special multi-function socket)
Input for voltage, resistance, frequency,
diode and continuity measurements.
(Receiving the red test lead)
Input for capacitance, Temperature, hFE
and 0.001mA to 200mA current
measurements. (Receiving the red test
lead or the “+” plug of the special
multi-function socket)
Input for 10A current measurements.
(Receiving the red test lead)
Delivered with the multimeter:
2.5 Accessories
One piece
• User's manual
One piece
One piece
• Test leads
• Special Multi-function socket
3. Function Description
3.1 General Functions
3.1.1 Misconnection Alarm
The input jacks of the meter are equipped with sound
and light alarms against misconnection of test leads.
COM
VΩHz
°C mA
hFE
10A
1. At V Ω、Hz ranges:
1) The red lights at the “V” and “COM” jacks will be
off after the test leads are plugged in.
2) The buzzer will sound upon misconnection of the
test leads in the “mA” or “10A” jacks to warn the
user. At the same time, the lights at the “V” and
“COM” jacks will flash to remind the user to plug
in the test leads there.
2. At mA, hFE, ranges:
The red lights at the “mA” and “COM” jacks will
be off after the test leads are plugged in.
The buzzer will sound upon misconnection of
the test leads in the “V” or “10A” jacks to warn the
user. At the same time, the red lights at the “mA”
and “COM” jacks will flash to remind the user to
plug in the test leads there.
3. At 10A range:
1) The red lights at the “10A” and “COM” jacks will be
off after the test leads are plugged in.
2) The buzzer will sound upon misconnection of the
test leads in the “V” or “mA” jacks to warn the user.
At the same time, the lights at the “10A” and
“COM” jacks will
、 、 、

11 12
3.2 Measurement Functions
3.2.1 AC and DC Voltage measurement
To avoid electrical shock and/or damage to the
instrument, do not attempt to take any voltage
measurement that might exceeds 1000Vdc or
750Vac rms.
To avoid electrical shock and/or damage to the
instrument, do not apply more than 1000Vdc or
750Vac rms between the common terminal and
the earth ground.
Voltage is the difference in electrical potential between
two points. The polarity of ac (alternating current)
voltage varies over time; the polarity of dc (direct
current) voltage is constant.
The Meter's DC voltage ranges are 200.00mV, 2.0000V,
20.000V, 200.00V and 1000.0V；AC voltage ranges
are 2.0000V, 20.000V, 200.00V and 750.0V.
To measure ac or dc voltage:
1. Set rotary switch to the proper range.
2. Connect the black and red test leads to the COM
and V terminals respectively.
3. Connect the test leads to the circuit being measured
4. Read the displayed value. The polarity of red test
lead connection will be indicated when making a
DCV measurement.
Note:
Unstable display may occur especially at DC200mV
and AC2V ranges, even though you do not put test
leads into input terminals, in this case, if an erroneous
reading is suspected, short the V terminal and the
COM terminal, and make sure the zero display.
3.2.2 Resistance measurement
To avoid electrical shock and/or damage to the
instrument, disconnect circuit power and
discharge all high-voltage capacitors before
measuring resistance.
3.1.2 DATA HOLD mode
Data Hold mode makes the meter stop updating the
display. Data Hold function can be cancelled by
changing the measurement mode, or push HOLD
key again.
To enter and exit the Data Hold mode:
1. Press HOLD key. Fixes the display on the current
value, is displayed.
2. A second short press returns the meter to normal
mode.
3.1.3 Battery Saver
Turn on the meter. And then The Meter will be turned
off automatic after approx. 30 minutes.
H

13 14
3.2.3 Diode Test
To avoid electrical shock and/or damage to the
instrument, disconnect circuit power and
discharge all high-voltage capacitors before
testing diodes.
Use the diode test to check diodes, and other
semi- conductor devices. The diode test sends a
current through the semiconductor junction, and then
measures the voltage drop across the junction; a
good silicon junction drops between 0.5V and 0.8V.
To test a diode out of a circuit:
1. Set the rotary switch to range.
2. Connect the black and red test leads to the COM
and terminals respectively.
3. For forward-bias readings on any semiconductor
component, place the red test lead on the
component's anode and place the black test lead
on the component's cathode.
4. The meter will show the approx. forward voltage of
the diode. If the test lead connection is reversed,
only figure "1" displayed.
In a circuit, a good diode should still produce a forward
bias reading of 0.5V to 0.8V; however, the reverse-bias
reading can vary depending on the resistance of other
pathways between the probe tips.
Resistance is an opposition to current flow.
The unit of resistance is the ohm ( ).
The Meter's resistance ranges are 200.00Ω,
2.0000kΩ, 20.000kΩ, 200.00kΩ, 2.0000MΩ,
20.000MΩ and 200.00MΩ.
To measure resistance:
1. Set the rotary switch to proper range.
2. Connect the black and red test leads to the COM
and terminals respectively.
3. Connect the test leads to the circuit being
measured and read the displayed value.
Ω
Ω
Some tips for measuring resistance:
• The measured value of a resistor in a circuit is often
different from the resistor's rated value. This is
because the Meter's test current flows through all
possible paths between the probe tips.
• In order to ensure the best accuracy in measurement
of low resistance, short the test leads before
measurement and memory the test probe resistance
in mind. This necessary to subtract for the resistance
of the test leads.
The resistance function can produce enough voltage
to forward-bias silicon diode or transistor junctions,
causing them to conduct. To avoid this, do not use the
2M range for in-circuit resistance measurements.
•
• On 20MΩ and 200MΩ ranges, the meter may take
a few seconds to stabilize reading. This is normal
for high resistance measuring.
• When the input is not connected, i.e. at open circuit,
the figure "1" will be displayed for the over range
condition.

3.2.5 Capacitance measurement
To avoid electrical shock and/or damage to the
instrument, disconnect circuit power and discharge
all high-voltage capacitors before measuring
capacitance. Use the dc voltage function to confirm
that the capacitor is discharged.
15 16
Capacitance is the ability of a component to store an
electrical charge.
The unit of capacitance is the farad (F). Most capacitors
are in the nanofarad to microfarad range.
The Meter's capacitance ranges are 20.000nF, 200.00nF,
2.0000F, 20.000F, and 200.00F.
To measure capacitance:
1. Set the rotary switch to proper range.
2. Connect the black and red test leads to the COM
and terminals respectively(or you can measure the
capacitance by using the special Multi-Function
Socket).
3. Connect the test leads to the capacitor being
measured and read the displayed value.
Some tips for measuring capacitance:
• The meter may take a few seconds to stabilize
reading. This is normal for high capacitance
measuring.
• To improve the accuracy of measurements less
than 20nF, subtract the residual capacitance of
the Meter and leads.
3.2.4 Continuity Check
To avoid electrical shock and/or damage to the
instrument, disconnect circuit power and
discharge all high-voltage capacitors before
testing for Continuity.
Continuity is a complete path for current flow.
The beeper sounds if a circuit is complete. These
brief contacts cause the Meter to emit a short beep.
To test for continuity:
1. Set the rotary switch to range.
2. Press the yellow key twice to activate Continuity
Check.
3. Connect the black and red test leads to the COM
and terminals respectively.
4. Connect the test leads to the resistance in the
circuit being measured.
5. When the test lead to the circuit is below approx.
50Ω, a continuous beeping will indicate it.
Note:
Continuity test is available to check open/short of the
circuit.
Ω

17 18
Current is the flow of electrons through a conductor.
The Meter's DC current ranges are 2.0000mA,
200.00mA and 10.000A;AC current ranges are
2.0000mA, 200.00mA and 10.000A.
To measure current:
1. Turn off the power of the measured circuit.
Discharge all the high voltage capacitors.
2. Set the rotary switch to the proper range.
3. Connect the black test lead to the COM terminal
and the red test leads to the mA terminal for a
maximum of 200mA. For a maximum of 10A, move
the red test lead to the 10A terminal.
4. Break the circuit path to be tested.
Connect the black test lead to the more negative
side of the break; connect the red test lead to the
more positive side of the break. (Reversing the
leads will give a negative reading, but will not
damage the Meter.)
5. Turn on the power of the measured circuit, and
then read the display. Be sure to note the
3.2.6 Transistor measurement
To avoid electrical shock and/or damage to the
instrument, do not apply more than 250Vdc or
250Vac rms between the hFE terminal and the
COM terminal.
1. Set the rotary switch to hFE range.
2. Connect the “com” plug and “+” plug of the special
multi-function socket to the COM and hFE terminals.
3. Determine whether the transistor to be tested is
NPN or PNP type and locate the Emitter, Base and
Collector leads.
4. Insert leads of the transistor into proper holes of the
special multi-function socket.
5. The meter will show the approx. hFE value.
3.2.8 Current measurement
To avoid damage to the Meter or injury if the fuse
blows, never attempt an in-circuit current
measurement where the open-circuit potential to
earth is greater than 250V.
To avoid damage to the meter, check the meter's
fuse before proceeding. Use the proper terminals,
function, and range for your measurement. Never
place the test leads in parallel with a circuit or
component when the leads are plugged into the
current terminals.
3.2.7 Frequency measurement
Do not measure Frequency on high voltage (>380V)
to avoid electrical shock hazard and/or damage to
the instrument.
Frequency is the number of cycles a voltage or current
signal completes each second.
To measure frequency:
1. Set the rotary switch to 20kHz range.
2. Connect the black and red test leads to the COM
and Hz terminals respectively.
3. Connect the test leads to the circuit being measured
4. Read the displayed value.

19 20
measurement units at the right side of the display
(mA or A). When only the figure "1" displayed, it
indicates overrange situation and the higher range
has to be selected.
6. Turn off the power of the measured circuit and
discharge all the high voltage capacitors. Remove
the test leads and recover the measured circuit.
4. Technical Specifications
4.1 General Specifications
• Environment conditions:
1000V CAT. II and 600V CAT.III
Pollution degree: 2
Altitude < 2000m
Operating temperature:
0~40°C, 32°F~122°F(<80% RH, <10°C noncondensing)
Storage temperature:
-10~60 °C, 14°F~140°F(<70% RH, battery removed)
• Temperature Coefficient:
0.1(specified accuracy) /°C(<18°C or >28°C)
• MAX. Voltage between terminals and earth ground:
750V AC rms or 1000V DC.
• Fuse Protection: mA: Resettable fuse (F200mA/250V)
• Sample Rate: 3 times/sec for digital data.
• Display: 4 1/2 digits LCD display. Automatic indication
of functions and symbols.
• Over Range indication: LCD will display "1".
• Low battery indication:
The " " is displayed when the battery is under the
proper operation range.
• Polarity indication: " " displayed automatically.
• Power source: 9V
• Battery type: NEDA 1604, 6F22, or 006P.
• Dimensions: 195(L)92(W)55(H) mm.
• Weight: 380g. Approx. (battery included).
Accuracy is specified for one year after calibration, at
operating temperatures of 18°C to 28 C, with relative
humidity at 0% to 75%.
Accuracy specifications take the form of:
±(% of Reading + Number of Least Significant Digits)
°
4.2 Measurement specifications
4.2.1 DC Voltage
Resolution
Range
0.01mV
Accuracy
±(0.1% of rdg +5 digit)
200mV
0.1mV
1mV
10mV
0.1V
2V
20V
200V
1000V ±(0.15% of rdg +5 digits)
4.2.2AC Voltage
Resolution
Range Accuracy(50~60Hz)
±(0.8% of rdg +15 digits)
0.1mV
1mV
10mV
0.1V
2V
20V
200V
750V ±(1.0% of rdg +15 digits)
Input impedance: 10MΩ
Max. input voltage: 250Vdc or ac rms for 200mV range
and 1000Vdc or 750V ac rms for other ranges,
±(0.05% of rdg +5 digit)
±(0.5% of rdg +15 digits)
Resolution
Range Accuracy(40~400Hz)
±(1.0% of rdg +50 digits)
0.1mV
1mV
10mV
0.1V
2V
20V
200V
750V ±(1.2% of rdg +50 digits)
±(1.0% of rdg +15 digits)

21 22
Input impedance: 10M
Max. input voltage: 250Vdc or ac rms for 200mV
range and 1000Vdc or 750V ac rms for other ranges,
Frequency Range: 40Hz-400Hz
Response: Average, calibrated in rms of sine wave
Ω
4.2.4 Resistance
Resolution
Range Accuracy
±(0.5% of rdg +5 digit )s
0.1Ω
1Ω
10Ω
100Ω
200Ω
2kΩ
20kΩ
200kΩ
2MΩ
20MΩ
200MΩ
1kΩ
10kΩ ± 5.0% of +20 digits][ rdg
±(0.5% of rdg +10 digits)
Overload protection: 250V dc or 250Vac rms.
Open Circuit Voltage: Less than 700mV.
0.01Ω
4.2.5 Diode
Forward DC Current: approx. 1mA
Reversed DC Voltage: approx. 1 5V
Overload protection: 250Vdc or 250Vac rms.
.
4.2.6 Audible continuity
Continuity beeper
Range
≤50Ω
Open circuit voltage: Less than 700mV.
Overload protection: 250Vdc or 250Vac rms.
4.2.7 Transistor
Description
Range Test Condition
Display read approx.
HFE value (0-1000)
of transistor under
test (all type).
Base Current approx.
10µA, Vce approx.
2.8V.
hFE
4.2.8 Capacitance
Resolution
Range Accuracy
10pF
0.1nF
1nF
10nF
20nF
200nF
20 0µF.
200 µF.0
±(4.0% of rdg +20 digit )s
Overload protection: Resettable fuse (F400mA/250V).
1pF
Overload protection: Resettable fuse (F400mA/250V).
2 0µF.
4.2.3 Frequency
Resolution
Range
Overload protection: 250V dc or 250V ac rms.
Input Voltage range: 200mV-10V ac rms
±(1.5% of rdg + 15 digits)
20kHz 1Hz
Accuracy
Range
Function Function
2V
DC forward current:
1mA; reverse
DC voltage: about 1.5V.
Display read approx.
forward voltage of diode
Resolution
0 1mV.

23 24
4.2.9 DC Current
Overload protection: Resettable fuse (F400mA/250V).
10A range: F10A/250V fuse
Max. input current: 200mA dc or 200mA ac rms for
mA range, 10A dc or 10A ac rms for 10A ranges.
For measurements>5A, 4 minutes maximum ON to
measure 10 minutes OFF; Above 10A unspecified.
Resolution
Range Accuracy
1mA
200mA
10A ±(2.0% of rdg +20 digits)
0.1μA
2mA ±(0.5% of rdg +10 digits)
10μA
4.2.10 AC Current
Overload protection: Resettable fuse (F400mA/250V).
10A range: F10A/250V fuse
Max. input current: 200mA dc or 200mA ac rms for
mA range, 10A dc or 10A ac rms for 10A ranges.
For measurements>5A, 4 minutes maximum ON to
measure 10 minutes OFF; Above 10A unspecified.
Frequency Range: 40Hz-400Hz
Response: Average, calibrated in rms of sine wave
Resolution
Range Accuracy
1mA
200mA
10A ±(2.5% of rdg +50 digits)
0.1μA
2mA ±(0.8% of rdg +20 digits)
10μA±(1.2% of rdg +20 digits)
5. Maintenance
Do not attempt to repair or service your Meter
unless you are qualified to do so and have the
relevant calibration, performance test, and service
information.
5.1 General Maintenance
To avoid electrical shock or damage to the
meter, do not get water inside the case.
Remove the test leads and any input signals
before opening the case
Periodically wipe the case with a damp cloth and mild
detergent. Do not use abrasives or solvents.
Dirt or moisture in the terminals can affect readings.
To clean the terminals:
• Turn the meter off and remove all test leads.
• Shake out any dirt that may be in the terminals.
• Soak a new swab with a cleaning and oiling agent
(such as WD-40).
• Work the swab around in each terminal. The oiling
agent insulates the terminals from moisture-related
contamination.

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5.2 Battery Replacement
To avoid false readings, which could lead to
possible electric shock or personal injury,
replace the battery as soon as the battery
indicator ( ) appears.
Before replacing the battery, disconnect test
leads and/or any connectors from any circuit
under test, turn the meter off and remove test
leads from the input terminals.
To replace the battery:
Turn the meter off.
Disconnect test leads and/or any connectors from
the terminals.
• Use a screwdriver to unscrew the two screws
secured on the battery cover.
Take out the battery cover from the meter.
Remove the used batteries.
Replace with the new 9V batteries (6F22).
•
•
•
•
•
• Rejoin the battery cover and secure by the two screws.
Using this appliance in an environment with a
strong radiated radio-frequency electromagnetic
field (approx. 3V/m), may influence its measuring
accuracy. The measuring result can be strongly
deviating from the actual value.
CAUTION
Battery cover
9V Battery
Figure 2. Battery and Fuse Replacement

HYS006660