Kusam-meco KM 2784-T User manual

®
LIST OF PRODUCTS
¬ Digital Multimeter ¬ Digital AC & AC/DC Clampmeter
¬ AC Clamp Adaptor ¬ AC/DC Current Adaptor
¬ Thermo Anemometer ¬ Thermo Hygrometer
¬ Distance Meter ¬ Digital Lux Meter
¬ Network Cable Tester ¬ Power Factor Regulator
¬ Earth Resistance Tester ¬ Digital Panel Meters
¬ DC Power Supplies ¬ High Voltage Detector
¬ Calibrators ¬ Gas Analysers
¬ Frequency Counter ¬ Function Generator
¬ Phasing Sticks ¬ Battery Tester
¬ Waterproof Pen Testers ¬ Solar Power Meter
¬ EMF Detector
¬ Wood, Paper & Grain Moisture Meter
¬ Transistorised Electronic Analog & Digital Insulation
Resistance Testers(upto 10 KV)
¬ Digital Sound Level Meter & Sound Level Calibrator
¬ Digital contact & Non-contact Type Tachometer
¬ Digital Non-contact (infrared) Thermometer
¬ Maximum Demand Controller/Digital Power Meter
¬ Digital Hand Held Temperature Indicators
®®
AN ISO 9001:2015 COMPANY
MODEL - KM 2784-T
OPERATION MANUAL
TRUE RMS
DIGITAL CLAMPMETER
!
!
600VCAT.III
1000VCAT.II MAX 1000 A
~
AUTO-POWER OFF
OFF
V
400A
1000A
~
~
~
W
Hz
EF
AC/DC CLAMP METER RMS-MEAS
H
FUNC.
REL RANGE
MAX
MIN
1000V
CAT.II
600V
CAT.III
COM VWHz
!
MAX
1000V
E
~
DC
AUTO
000.0 V
KM 2784-T
KUSAM-MECO
TRMS
G 17, Bharat Industrial Estate, T. J. Road,
Sewree (W), Mumbai - 400 015. INDIA.
Sales Direct : [phone]
Tel. : [phone]
Email : [email protected]
Website : www.kusamelectrical.com
®
04/02/2020
OFFICE ADDRESS SERVICE CENTER
Shop no.18, 1st Floor, CIDCO Shopping
Complex, Plot # 9, Sector-7,
Rajiv Gandhi Marg, Sanpada,
Navi Mumbai - 400705.
Sales Direct :[phone]
Tel. :[phone]
Email : [email protected]
Website : www.kusamelectrical.com

®®
01 02
1. GENERAL INSTRUCTION
This instrument complies with IEC 61010-1, CAT II 1000V &
CAT III 600V overvoltage standards.
To get the best service from this instrument, read carefully this
user’s manual & respect the detailed safety precautions.
International symbols used on the meter & in this manual are
explained in chapter 1.2.
1.1 Precautions safety measures
1.1.1 Preliminary
* As the possibilities of high transient overvoltages occurred in
today’s power systems increase, more stringent safety standards
are set for the electrical test equipment. Transients on electrical
systems (power grid, feeder or branch circuits) will trigger a series
of incidents that may result in serious personal injury. To protect
you against transients, safety must be built into the test equipment.
Overvoltage
category In Brief Examples
CAT I ● Protected Electronic Equipment.
● Equipment connected to
(source) circuits in which
measures are taken to limit
transient overvoltages to an
appropriately low level.
● Any high-voltage, low-energy
source derived from a high
winding resistance transformer,
such as the high-voltage section
of a copier.
Electronic
Overvoltage
category In Brief Examples
CAT II ● Appliance, portable tools, &
other household & similar loads.
● Outlet & long branch circuits.
● Outlets at more than 10 meters
(30 feet) from CAT III source.
● Outlets at more that 20 meters
(60feet) from CAT IV source.
Single-phase
receptacle
connected
loads
CAT III Three-phase
distribution,
including
single-phase
commercial
lighting
● Equipment in fixed installations,
such as switchgear & poly-
phase motors.
● Bus & feeder in industrial plants.
● Feeders & short branch circuits,
distribution panel devices.
● Lighting systems in larger
buildings.
● Appliance outlets with short
connections to service entrance.
CAT IV Three-phase
at utility
connection,
any outdoor
conductors
● Refers to the “origin of install-
ation”; i.e., where low-voltage
connection is made to utility
power.
● Electricity meters, primary over
current protection equipment.
● Outside & service entrance,
service drop from pole to
building, run between meter &
panel.
● Overhead line to detached
building, underground line to
well pump.

®®
03 04
* 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.Pg.2
1.1.2 During use
* 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, & 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.
* 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, including manual or auto-ranging, 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 & 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 & 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 just 3pcs AAA batteries, 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 & personal injury.
* Do not measure voltages above 1000V in Category III, or 600V
in Category IV installations.

®®
05 06
* When in REL mode, the “REL” symbol is displayed. Caution must
be used because hazardous voltage may be present.
* Do not operate the meter with the case (or part of the case)
removed.
1.2 Symbols :
* A “qualified person” is someone who is familiar with the installation,
construction & operation of the equipment & the hazards involved.
He is trained & authorized to energize & de-energize circuits &
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 & 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 & do not store the meter in high temperature or high
humidity environment.
Caution ! Refer to the instruction manual. Incorrect use
may result in damage to the device or its components.
Symbols used in this manual & on the instrument.
AC--Alternating Current
DC--Direct Current
AC or DC
Earth (Ground)
Double Insulated
Fuse
Conforms to European Union directives
CE
1.3 Instructions
* 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 & make sure you are not charged with
static electricity, which may destroy internal components.
* 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.

®®
07 08
2. TECHNICAL SPECIFICATIONS:
FEATURES :
í Measurement CAT II 1000V, CAT III 600V AC/DC
í Altitude < 2000m
í MAX / MIN Function
í Pollution Degree 2
í Data Hold Function
í Manual ranging & Autorange Mode
í Relative measurement mode
í Backlight for Display
í TRMS Measurement.
GENERAL SPECIFICATIONS :
í Sensing : True RMS sensing
í Display : 3-3/4 digits 4000 counts LCD display.
Automatic indication of functions & symbols.
40mmí Jaw Size :
3 times/sec (Digital Display).í Sampling rate :
í Maximum Voltage between terminals &
Earth ground : 1000VAC rms or 1000VDC
í Operating Temperature : 0~40°C(32°F ~ 122°F)
<80% RH, <10°C non-condensing.
-10~60°C(14°F ~ 140°F)í Storage Temperature :
<70% RH, battery removed.
0.1 x (specified accuracy) / í Temperature Coefficient :
°C (<18°C or >28°C)
Test leads set, Users Manual, Battery, Thermocouple &
Carrying Case.
ACCESSORIES :
í Range selection : automatic & manual.
í Over Range Indication : LCD will show “OL”
Low Battery Indication : The is displayed when the batteryí
voltage drops below the operating voltage.
í Polarity : Automatic polarity “-” display
Auto Power Off : The meter is powered off 15 minutes í
Power Supply : 1.5V AAA x 3 Battery.í
Dimension : Approx.190(L) x 90(W) x 40(H)mmí
Weight : Approx. 500 gms. (including battery).í

®®
09 10
RESISTANCE
Range Accuracy
Resolution
400.0 W± (0.5%rdg + 3dgts)
4.000 kW
± (0.5%rdg + 2dgts)
40.00 kW
400.0 kW
4.000 MW
40.00 MW± (1.5%rdg + 5dgts)
0.1 W
1 W
10 W
100 W
1 kW
10 kW
AC VOLTAGE (40Hz ~ 1000Hz)
Range Accuracy
Resolution
± (1.0%rdg + 5dgts)
1000 V ± (1.5%rdg + 5dgts)
4.000 V
40.00 V
400.0 V
1 mV
10 mV
100 mV
1 V
Above accuracies can be within 5% ~100% of the full range.
The true RMS meter has residual value within 10 counts when
the test leads are shorten, but that will not affect the accuracy
of measurement.
1. Response for ACV : RMS measure, calibrated in rms
of sine wave.
2. Overload Protection : 1000V DC or 1000V AC rms.
4. Input Impedance (Nominal): AC & DC Voltage : >10MW
CAPACITANCE
Range Accuracy
Resolution
± (5.0%rdg + 20dgts)
4.000 nF
40.00 nF
400.0 nF
4.000 mF
40.00 mF
400.0 mF
4.000 mF
± (5.0%rdg + 10dgts)
1 pF
10 pF
100 pF
1 nF
10 nF
100 nF
1 mF
± (3.0%rdg + 15dgts)
3. ELECTRICAL SPECIFICATIONS:
DC VOLTAGE
Range Accuracy
Resolution
± (0.5%rdg + 5dgts)
± (0.8%rdg + 5dgts)
1000 V ± (1.0%rdg + 2dgts)
400.0 mV
4.000 V
40.00 V
400.0 V
0.1 mV
1 mV
10 mV
100 mV
1 V
AC CURRENT (40Hz ~ 400Hz )
Range
Above accuracies can be within 5% ~100% of the full range.
The true RMS meter has residual value within 10 counts when
the test leads are shorten, but that will not affect the accuracy
of measurement.
1. Maximum input current : 1000A DC or AC rms.
2. Use ZERO function to clean the initial reading before
measurement.(ZERO function will disable AUTOrange)
Accuracy
Resolution
400.0 A
1000 A ± (3.0%rdg + 8dgts)
0.1 A
1 A
DC CURRENT
Range Accuracy
Resolution
400.0 A
1000 A ± (3.0%rdg + 6dgts)
0.1 A
1 A
Accuracy is (% reading digits + number of digits) or otherwise
specified, at 18°C To 28°C & less than 80% relative humidity.

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11 12
LOGIC FREQUENCY (1Hz-1MHz)
Voltage Input <10Vpp
Range
0.001 Hz
0.01 Hz
0.1 Hz
0.001 kHz
0.01 kHz
0.1 kHz
1 kHz
Resolution
4.000 Hz
40.00 Hz
400.0 Hz
4.000 kHz
40.00 kHz
400.0 kHz
4.000 MHz
±(0.1%rdg+5dgts)
Accuracy
TEMPERATURE
Range Accuracy
0°C~ 400°C
400°C~ 1000°C 1°C ±(2.0%rdg)
±(2.0%rdg+3°C)
Resolution
Note : The specifications of temperature don’t include
thermocouple errors.
Supplied Thermocouple is suitable for measurement
upto 250°C
CONTINUITY CHECK
Range Resolution Test Condition
200.0 W0.1 WOpen Circuit Voltage :
approx. 0.5V
Description : Continuity beeper £ 50W
DIODE TEST
Range Resolution Test Condition
2.000 V 0.001 V
Forward DC Current
approximately 1mA.
Reversed DC Voltage
approximately 1.5V.
2. DESCRIPTION
The front panel is shown as in Figure 2-1, explanation
being as follows:
2.1 Product Description :
1. Clamp -
Used for letting the wire across it.
(Notice the direction of electricity).
2. Rotary switch -
Used for selecting measurement
functions.
3. Keypad -
Measurement function keys.
4. LCD display -
Used for displaying the measuring
results & various symbols.
5. Terminal receiving the red test
lead for voltage, resistance,
capacitance, frequency, Temperature,
diode & continuity measurements.
6. COM -
Terminal receiving the black test lead
as a common reference.
7. Used for open the clamp
!
!
600VCAT.III
1000VCAT.II MAX 1000 A
~
AUTO-POWER OFF
OFF
V
400A
1000A
~
~
~
W
Hz
EF
AC/DC CLAMP METER RMS-MEAS
H
FUNC.
REL RANGE
MAX
MIN
1000V
CAT.II
600V
CAT.III
COM VWHz
!
MAX
1000V
E
~
DC
AUTO
000.0 V
KM 2784-T
KUSAM-MECO
TRMS
1
2
3
4
5
6
7
Figure 2-1

®®
13 14
AC DC HREL MAX MIN
AUTO
°C°F
kMWHz
FAV
8.8.8.8
119
10
11
12
9
8
7
5
6
3
4
2
1
ol
13
Figure 2-2
2. DESCRIPTION LCD Screen is shown as in Figure 2-2, with its every symbol’s
meaning shown as in the Table 1:
Symbol Description
Indicates negative readings
The meter is in the Autorange mode in which the
meter automatically selects the range with the
best resolution
Indicator for AC Voltage or Current
Indicator for DC Voltage or Current
Low Battery indication
The meter is in Data Hold mode.
The meter is in Relative Measurement mode.
Display maximum data
Display minimum data
The meter is in Continuity Check mode
The meter is in Diode Test mode.
Measurement units
This symbol means that the input is too large
for the selected range.
Auto power off function indication.
AUTO
H
REL
MAX
MIN
% °C°F
KMWHz
nmmFAV
OL
AC
DC

®®
15 16
2.3 Keypad
2.3.1 FUNC.
Press it to switch the second function in the same rotary position.
Press it to enter & exit the Data Hold mode.
Pressit & hold 2 seconds, backlight on; if press it & hold for
2 seconds again, backlight off.
2.3.2 RANGE
At V~, V , W, A, mA & mA.
1. Press RANGE to enter the manual ranging mode.
2. Press RANGE to step through the ranges available for the
selected function.
3. Press & hold RANGE for 2 seconds to return to autoranging.
2.3.3 MAX / MIN
This key is for measuring maximum value & minimum value.
1. Press it to enter Max/Min mode.
2. Press it again; the LCD will display the Maximum Value.
3. Press it again; the LCD will display the Minimum Value.
4. Press & hold it for 2 seconds, the meter will return to normal
measurement state.(Except Hz/Duty & Capacitance)
2.3.4
H
3. FUNCTION DESCRIPTION
3.1 General Functions
3.1.1 DATA HOLD mode
Data Hold mode makes the meter stop updating the display.
Enabling Data Hold function in autorange mode makes the meter
switch to manual ranging mode, but the full-scale range remains the
same. Data Hold function can be cancelled by changing the
measurement mode, pressing RANGE key, or push key again.
To enter & exit the Data Hold mode :
1. Press key (short press). Fixes the display on the current
value, H is displayed.
2. A second short press returns the meter to normal mode.
H
H
The meter has both manual ranging & autorange options.
* In the autorange mode, the meter selects the best range for the
input detected. This allows you to switch test points without
having to reset the range.
* In the manual ranging mode, you select the range. This allows
you to override autorange & lock the meter in a specific range.
* The meter defaults to the autorange mode in measurement
function that have mode than one range. When the meter is in
the auto-range mode, AUTO is displayed.
3.1.2 Manual ranging & Autorange mode
1. Press RANGE key. The meter enters the manual ranging mode.
AUTO turns off. Each presses of RANGE key increments the
range. When the highest range is reached, the meter wraps to
the lowest range.
To enter & exit the manual range mode :

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17 18
NOTE : If you manually change the measurement range after
entering the Data Hold modes, the meter exits this mode.
3.1.4 Relative measurement mode
3.1.3 Auto power off mode
The meter at the “auto power off mode” & display if the meter is
on but not used for 15 minutes. Press the FUNC. key or rotate the
rotary switch to wake the meter up.
To disable the “auto power off mode”, hold down the FUNC, key
while turning the meter on.
The meter will display relative measurement in all functions except
frequency.
To enter & exit the relative measurement mode.
1. with the meter in the desired function, touch the test leads to the
circuit on which you want future measurement to be based.
3.1.5 RMS measurement
All the AC measurement values is the RMS (root-mean-square)
values.
Frequency range is up to 1KHz sine.
2. To exit the manual ranging mode, press & hold down RANGE
key for two seconds. The meter returns to the autorange mode &
AUTO is displayed.
Press the FUNC. key or rotate the rotary switch to wake the
meter up.
3.2 MEASUREMENT FUNCTIONS
3.2.1 AC & DC voltage measurement
To avoid electrical shock & / or damage to the instrument,
do not attempt to take any voltage measurement that might
exceeds 1000Vdc or 1000Vac rms.
The meter’s voltage ranges are 400.0mV,
4.000V, 40.00V, 400.0V and 1000V.
To measure AC or DC voltage (set up &
connect the meter as shown in Figure 3-1) :
1. Set rotary switch to the AC/DC V range.
2. Press the FUNC. key can change the
mode of voltage test.
3. Connect the black & red test leads to the
COM & V terminals respectively.
4. Connect the test leads to the circuit being
measured.
5. 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
400mv range, even though you do not put
test leads into input terminals. For better
accuracy when measuring the DC offset of
an AC Voltage, measure the AC Voltage
range equal to or higher than the AC range.
This improves the accuracy of te DC
measurement by ensuring that the input
protection circuits are not activated.
!
!
600VCAT.III
1000VCAT.II MAX 1000A
~
AUTO-POWER OFF
OFF
V
400A
1000A
~
~
~
W
Hz
EF
AC/DC CLAMP METER RMS-MEAS
H
FUNC.
REL RANGE
MAX
MIN
1000V
CAT.II
600V
CAT.III
COM VWHz
!
MAX
1000V
E
~
DC
AUTO
000.0 V
KM 2784-T
KUSAM-MECO
TRMS
+
-
DC
VOLTAGE
!
!
600VCAT.III
1000VCAT.II MAX 1000A
~
AUTO-POWER OFF
OFF
V
400A
1000A
~
~
~
W
Hz
EF
AC/DC CLAMP METER RMS-MEAS
H
FUNC.
REL RANGE
MAX
MIN
1000V
CAT.II
600V
CAT.III
COM VWHz
!
MAX
1000V
E
~
DC
AUTO
000.0 V
KM 2784-T
KUSAM-MECO
TRMS
V
AC
VOLTAGE
!
Figure 3-1 Measuring
AC & DC Voltage