Kusam-meco 2700 User manual

CLAMP METER
2700 / 2790
!
DATA HOLD
2700
CLAMP METER
W
DCV
AC
ACAACV
A
200
OFF OFF
200K
200
mV
200V
1000
V750V
200V
200A
300A
20A
500V MAX
1000VDC
750VAC
MAX
COM VW
WARRANTY
Each “KUSAM-MECO” product is warranted to be free from
defects in material and workmanship under normal use &
service. The warranty period is one year (12 months) and
begins from the date of despatch of goods. In case any defect
occurs in functioning of the instrument, under proper use,
within the warranty period, the same will be rectified by us
free of charges, provided the to and fro freight charges are
borne by you. This warranty extends only to the original buyer
or end-user customer of a “KUSAM-MECO” authorized dealer.
This warranty does not apply for damaged Ic’s, fuses,
disposable batteries, carrying case, test leads, or to any
product which in “KUSAM-MECO’s” opinion, has been
misused, altered, neglected, contaminated or damaged by
accident or abnormal conditions of operation or handling.
“KUSAM-MECO” authorized dealer shall extend this warranty
on new and unused products to end-user customers only but
have no authority to extend a greater or different warranty
on behalf of “KUSAM-MECO”.
“KUSAM-MECO’s” warranty obligation is limited, at option,
free of charge repair, or replacement of a defective product
which is returned to a “KUSAM-MECO” authorized service
center within the warranty period.
THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE
REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. “KUSAM-MECO”
SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT,
INCIDENTAL OR CONSEQUENTIAL DAMAGES OR
LOSSES, INCLUDING LOSS OF DATA, ARISING FROM
ANY CAUSE WHATSOEVER.
All transaction are subject to Mumbai Jurisdiction.

Nearly every electrical engineer has a hand held
digital clamp meter (Tongtester). We sometimes take
them for granted, until we damage them or “burn them
out”. If you incorrectly connect your clamp meter to a
circuit,or if you have the clamp meter on wrong setting,
you damage the meter and possibly hurt yourself. You
can also get into trouble if you try to measure the
voltage across a charged capacitor.
TAKE MEASUREMENT CAREFULLY AND YOU’LL
SPARE YOUR METER AND YOURSELF, SOME PAIN
Clamp meter users frequently burn their meters by
trying to measure current the same way as they
measure voltage. Remember, you measure voltage
across a circuit, and current through a circuit. When
you use the current input, your clamp meter becomes
a low impedance circuit element.
Even if you correctly insert your clamp meter in to the
circuit, you can still damage your meter. Don’t try to
measure current in excess of your meter’s capacity.
Check the current capacity of the Clamp meter.
If you are measuring current in industrial environment
to prevent excess current from flowing through your
meter, always disconnect your test leads from the
circuit under test whenever you change Clamp meter
functions. Set your meter to the correct function, say
current, and its highest range for the setting. If the
reading is small, change the range to the next lower
range till the reading can be read with the best
possible accuracy. When measuring voltage, connect
the test leads before your apply power to your circuit.
To be safe, start by setting your meter to its highest
range first.
Table of Contents
Title Page
Overview ...............................................
Unpacking Inspection
Rules For Safe Operation
International Electrical Symbols
The multimeter Structure
Functional Buttons
Display Symbols
Measurement Operation
A. DC Voltage Measurement
B. AC Voltage Measurement
C. AC Current Measurement
D. Measuring Resistance
E. Measuring Diodes & Continuity
F. Measuring Frequency
General Specifications
Electrical Specifications
A . AC Current
B. AC Voltage
C. DC Voltage
D. Resistance
E. Diodes and Continuity Test
F. Frequency
Maintenance
A . Replacing the Battery
B. Test Certificate

!
!
Overview
Warning : identifies conditions and
actions that could result in
serious injury or even death to
the user.
Caution : identifies conditions and Actions
that could cause damage or
malfunction in the instrument.
Terms in this manual
Digital Clampmeter Model - 2700/2790
(hereafter referred to as “the Meter”) is a 3½
digits Clampmeter with steady operations, and
highly reliable hand-held measuring instrument
having different measurement positions. The
Clampmeter not only can measure AC/DC
Voltage, AC Current, Resistance, Diodes and
Continuity, Frequency (in model 2790) but also
has Data Hold, Full Icon Display.
To avoid electric shock or personal injury,
read the “Safety Information” and “Rules
for Safe Operation”carefully before using
the Meter.
Warning
1 2
Unpacking Inspection
Open the package case and take out the
Clampmeter. Check the following items
carefully to see any missing or damaged part :
Qty.
User Manual
Test Lead
In the event you find any Part missing or
damaged, please contact your dealer
immediately.
Item Description
2
11
1pair

3
!
Rules For Safe Operation (1)
Warning
To avoid possible electric shock or personal
injury, and to avoid possible damage to the Meter
or to the equipment under test, adhere to the
following rules :
n Before using the Meter inspect the case. Do not
use the Meter if it is damaged or the case (or part
of the case) is removed. Look for cracks or
missing plastic. Pay attention to the insulation
around the connectors and Clamps.
n Inspect the test leads for damaged insulation or
exposed metal. Check the test leads for Continuity.
Replace damaged test leads with identical
electrical Specifications before using the Meter.
n Do not apply more than the rated voltage, as
marked on the Meter, between the terminals or
between any terminal and grounding.
n The rotary switch should be placed in the right
position and no any changeover of range shall be
made while measurement is conducted to
prevent damage of the Meter.
n When measurement is taken at an effective
voltage over 60V in DC or 30V rms in AC, special
care should be taken for there is danger of
electric shock.
n Use the proper terminals, function, and range for
your measurements.
n Do not use or store the Meter in an environment
of high temperature, humidity, explosive,
inflammable and strong magnetic field. The
performance of the Meter may deteriorate after
the meter is dampened.
n When using the test leads, keep your fingers
behind the finger guards.
4
- +
Rules For Safe Operation (2)
n Disconnect circuit power and discharge all high
-voltage capacitors before testing resistance,
continuity, diodes, or current.
n 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.
n Turn the Meter power off when it is not in use and
take out the battery when not using for a long
time.
n Constantly check the battery as it may leak when
it has not been used for some time, replace the
battery as soon as leaking appears. A leaking
battery will damage the Meter.

5
International Electrical Symbols
- +
~
AC (Alternating Current).
DC (Direct Current).
Both DC & AC.
Grounding.
Double Insulated.
Deficiency of Built-In Battery.
Continuity Test.
Diode.
Fuse.
Warning! Refer to the Operating Manual.
Caution ! Risk of Electric Shock.
~
!
6
!
2700
CLAMP METER
1000VDC
750VAC
MAX
COM VW
( Figure 1)
1
23
4
5
7
6
1) TRANSFORMER JAWS :
Pick up the AC current flowing through the
conductor.
2) TRIGGER : Press the lever to open the trans-
former jaws When the lever is released, the jaws
will close again.
3) DATA HOLD SWITCH : A push switch (push ON/
OFF) Data-Hold switch will freeze reading when
pressed.
4) LCD DISPLAY : A 3½ digit display (maximum
reading 1999) indicates measured values, and
features symbols indicating function, Data - Hold,
Low Battery, Continuity, Diode.
5) FUNCTION SELECTOR : To Select ACV, ACA,
DCV, RESISTANCE,FREQUENCY (in model 2790).
The Clampmeter Structure (see figure 1)

7
Functional Buttons
Below table indicates the functional button
operations
H
Buttons
POWER
(Yellow Switch)
DATA HOLD
(Yellow Button)
Operation Performed
Turn the Meter on and off.
n Rotate the SWITCH to turn on the
Meter.
n Rotate the SWITCH to turn off
the Meter.
n Press DATA HOLD once to enter
hold mode.
n Press DATA HOLD again to exit
hold mode.
n In Hold mode, is displayed and
the present value is shown.
6) INPUT JACKS (VW and COM) :
Test leads are inserted into these jacks for Voltage,
Resistance, Frequency (in Model - 2790) measure-
ments and Continuity & Diode Checks.
7) DROP- PROOF WRIST STRAP :
Prevents the instrument from slipping off the hand
while in use.
8
H
Symbol
No.
1
2
3
4
5
6
7
8
9
10
Meaning
Dangerous Voltages.
The battery is low.
Warning : To avoide false
readings, which could lead to
possible electric shock or
personal injury, replace the
battery as soon as the battery
indicator appears.
Indicator for AC voltage or
current, The displayed value
is the mean value.
Indicates negative reading.
Test of diode.
Data Hold is active.
The continuity buzzer is on.
A : Amperes (amps). The unit
of current.
V : Volts. The unit of voltage.
Hz : frequency. The unit of
frequency (in Model 2790)
A
V
Hz
- +
~
!
Display Symbols (see figure 2)
( Figure 2)
H
220 200
~
A
V
Hz

9
Display Symbols (see figure 2)
NO.
11
MeaningSymbol
W, kW, W : Ohm. The unit of
resistance.
3
KW : kilohm. 1 x 10 or
1000 ohms.
10
- +
!
!
( Figure 3 )
Red Black
!
2700
CLAMP METER
1000VDC
750VAC
MAX
COM VW
~
Measurement Operation
n Make sure the Low Battery display is not on,
otherwise false readings may be provided.
n Pay extra attention to the symbol which is located
besides the input terminals of the Meter before carrying
out measurement.
A. DC voltage measurement (see figure 3)
Warning
To avoid harm to you or damages to the Meter from
electric shock, please do not attempt to measure
voltages higer than 1000V DC or 750V AC rms
although readings may be obtained.
1) Insert the red test lead into the VW input
terminal and the black test lead into the COM input
terminal
2) Set the rotary switch to an appropriate measurement
position in V range.
3) Connect the test leads across with the object being
measured.
The measured value shows on the display.
The DC Voltage ranges are : 2V, 200V and 1000V. To
measure DC voltage, connect the Meter as follows :

11
( figure 4)
Red Black
!
2700
CLAMP METER
1000VDC
750VAC
MAX
COM VW
~
Caution :
n If the value of voltage to be measured is unknown,
use the maximum measurement position (1000V)
and reduce the range step by step until a satis-
factory reading is obtained.
n The LCD displays “1” indicating the existing
selected range is overloaded, it is required to
select a higher range in order to obtain a correct
reading.
n In each range, the Meter has an input impedance
of approx. 10MW . This loading effect can cause
measurement errors in high impedance circuits.
If the circuit impedance is less than or equal to
10kW , the error is negligible (0.1% or less).
n When DC voltage measurement has been
completed, disconnect the connection between
the testing leads and the circuit under test.
B. AC Voltage Measurement (see figure 4)
12
!Warning :
To avoid harm to you or damages to the Meter
from electric shock, please do not attempt to
measure voltages higher than 1000V or 750V
rms although readings may be obtained.
The AC voltage measurement has 2 measurement
positions on the rotary switch : 200V and 750V
To measure AC Voltage, connect the Meter as
follows :
1) Insert the red test lead into the VW Terminal
and the black test lead into the COM terminal.
2) Set the rotary switch to an appropriate
measurement position in V ~ range.
3) Connect the test leads across with the object
being measured.
The measured value shown on the display, is
effective value of sine wave (mean value response).
n If the value of voltage to be measured is unknown,
use the maximum measurement position (750V)
& reduce the range step by step until a satisfactory
reading is obtained.
Caution :
n When AC voltage measurement has been
completed, disconnect the connection between
the testing leads and the circuit under test.
n The LCD displays “ 1 “ indicating the existing
selected range is overloaded, it is required to
select a higher range in order to obtain a correct
reading.

13
!
!
2700
CLAMP METER
1000VDC
750VAC
MAX
COM VW
(figure 5)
C. AC Current Measurement (see figure 5)
Never attempt an in-circuit current measurement where
the voltage between terminals and ground is greater
than 60V.
1) Open the jaw and place the conductor in the
center of the jaw for accurate measurement.
2) Set the rotary switch to an appropriate
measurement position in AC current range.
The measured value is shown on the display.
Warning
Use proper function, and range for the current
measurement.
The AC Current measurement has 3 measurement
positions on the rotary Switch: 20A, 200A, 300A,
600A* (in Model - 2790)
To measure AC Current :
Caution :
1) Place the switch in the 300A range position if the
measured current is unknown. Rotate the switch to
lower positions to get more accurate readings.
14
!
Red Black
!
2700
CLAMP METER
1000VDC
750VAC
MAX
COM VW
(figure 6)
2) The LCD displays “ 1 ” indicating the existing
selected range is overloaded, it is required to
select a higher range in order to obtain a correct
reading.
3) When AC Current measurement has been
completed, Open the jaw to remove the
conductor & then Switch off the meter.
D. Resistance Measurement (see figure 6)
Warning
To avoid damages to the Meter or to the devices
under test, disconnect circuit power and
discharge all the high-voltage capacitors before
measuring resistance.
The resistance range has 2 measurement positions
on the rotary switch : 200W, 200kW

16
!
Red Black
!
2700
CLAMP METER
1000VDC
750VAC
MAX
COM VW
(Figure 7)
E. Measuring Diodes & Continuty (See figure 7)
Warning
To avoid damage to the Meter or to the equipment
under test, disconnect circuit power & discharge
all high-voltage capacitors before measuring
diodes and continuity.
Testing Diodes
Use the diode test function to check diodes,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.
2) Set the rotary switch to position.
To test a diode out of a circuit, connect the Meter
as follows :
1) Insert the red test lead into the VW terminal
and the black test lead into the COM terminal.
15
To measure resistance, connect the meter as follows
1) Insert the red test lead into the VW
terminal and the black test lead into the COM
terminal.
2) Set the rotary switch to an appropriate
measurement position in W range.
3) Connect the test leads across with the object
being measured.
The measured value shows on the display,
The test leads can add 0.1W to 0.3W of error to t h e
Resistance measurement. To obtain p r e c i s i o n
readings in low-resistance, that is the range of 200W,
short-circuit the input terminals before hand & record
the reading obtained (call this reading asX).(X) is
the additional resistance from the test lead.
Caution:
n
When there is no input, for example in open
circuit condition, the Meter displays “ 1 “.
When resistance measurement has been
completed, disconnect the connection between
the testing leads and the circuit under test.
Then use the equation :
Measured resistance value (Y) - (X) = precision
readings of resistance.
Note :
n
n
1) Never connect high voltage to the input sockets
with the switch in Resistance range.
2) Using Resistance measurement function in a live
circuit will produce false results and may da ma g e
the instrument. In many cases the suspect compo-
nent must be disconnected from t h e c ir c ui t t o
obtain an accurate reading.

17
3) For forward voltage drop reading on any Semi-
conductor component, place the red test lead on
the component’s anode and place the black test
lead on the component’s cathode.
The measured value shows on the display.
Caution :
n In a circuit, a good diode will produce a forward
voltage drop reading of 0.5V to 0.8V; howerver; the
reverse voltage drop reading can vary depending
on the resistance of other pathways between the
probe tips.
n Connect the test leads to the proper terminals as
said above, to avoid error display. The LCD will
display “1” indicating open-circuit for wrong
connection. The unit of diode is Volt (V), displaying
the positive connection voltage-drop value.
n When diode testing has been completed, disconnect
the connection between the testing leads and the
circuit under test.
1. Insert the red test lead into VW terminal
and the black test lead into the COM terminal.
2. Set the rotary switch to position.
3. Connect the test leads across with the object
being measured.
The buzzer sounds if the resistance of the circuit
under test is less than 30W.
The LCD displays the resistance value of the
circuit under test.
Testing for Continuity
To test for continuity, connect the Meter as below :
n The LCD displays “1” indicating the circuit being
tested is open.
Caution :
18
!
Red Black
!
2700
CLAMP METER
1000VDC
750VAC
MAX
COM VW
~
(Figure 8)
n When continuity testing has been completed,
disconnect the connection between the testing
leads and the circuit under test.
F: Frequency Measurement (in model 2790)
(see figure 8)
To measure frequency, connect the Meter as follows :
1) Insert the red test lead into the VW terminal & the
black test lead into the COM Terminal.
Warning :
To avoid harm to you or damages to the Meter, do
not attempt to measure voltages higher than 60V in
DC or 30V rms in AC although reading may be
obtained.
When the frequency signal to be tested is higher
than 30Vrms, the Meter cannot guarantee accuracy
of the measurement.
The frequency measurement ranges is 20kHz.

20
- +
Display : 3½ digit LCD. maximum reading 1999 with
automatic sign and Function annunciators.
Overange indication : MSB (highest) digit OL (1) or
(-1) is displayed.
Low battery : “ ” is displayed when the battery
voltage drops below the operating voltage.
Measurement rate : 3 measurements per second,
nominal.
Operating temperature :0 °C to + 50°C, 0-70% RH.
Storage temperature : -20°C to 60°C, 0-80% RH
with battery removed.
Accuracy : Accuracy specifications at 23 ± 5°C less
than 75% RH.
Power : Single standard 9 Volt Battery
Dimension : 19.2(L) x 8.2(W) x 3.3(H) cm.
Weight : Approx (250 g rams) including battery.
Accessories : Test leads( pair), Battery, Manual,
Carrying Case.
FEATURES :
n HIGH - ACCURACY, DIGITAL READING.
n LARGE LCD FOR EASY READING.
n INSTANT CONTINUITY BUZZER.
n OVERLOAD PROTECTION ON ALL RANGES.
n RECESSED SAFETY DESIGNED INPUT J ACKS.
n “DATA - HOLD ” SWITCH FREEZES READING.
GENERAL SPECIFICATIONS :
19
2) Set the rotary switch in the Hz range.
3) Connect the test leads across with the object
being measured. The measured value shows on
the display.
Caution :
n When Hz measurement has been completed,
disconnect the connection between the testing
leads and the circuit under test.

21
(50~60 Hz)
AC CURRENT
Range Resolution
20 A
200 A
300 A
600 A*
0.01 A
0.1 A
1 A
1 A
Accuracy
± (3% rdg + 4 dgts.)
± ( 2% rdg + 4 dgts.)
± ( 1.5% rdg + 4 dgts.)
AC VOLTAGE(50~500 Hz)
Range Resolution
200 V
750 V
0.1 V
1 V
Accuracy
± (1.2% rdg + 4 dgts.)
± (1.5% rdg + 4 dgts.)
ACCURACY : 2790 : ±(3%rdg+4dgts) for 200V & 750V range
INPUT IMPEDANCE : 10 MW
OL - PROTECTION : 1200 VDC/800 VAC ON ALL RANGES.
DC VOLTAGE(2700)
Range Resolution Accuracy
2 V 1 mV
± (0.5% rdg + 1 dgt)
200 V 0.1 V
1000 V 1 V
ELECTRICAL SPECIFICATION
n Accuracies are ± (%reading + number of digits).
at 23 ± 5°C less than 75% R.H.
* 600A range in Model - 2790
INPUT IMPEDANCE : 10MW
OL - PROTECTION : 500VDC/350VAC ON 200mV RANGE
1200VDC/800VAC ON OTHER RANGE.
DC VOLTAGE(2790)
Range Resolution Accuracy
± (1.5% rdg + 1 dgt)
200 V 0.1 V
1000 V 1 V
DIODE TEST
TEST CURRENT 1.0 ± 0.6mA
TEST VOLTAGE 3.2V MAX.
OL - PROTECTION : 500VDC/350VAC.
CONTINUITY BEEPER
THRESHOLD < 30W
RESPONSE TIME < 100mS
OL - PROTECTION : 500VDC/350VAC.
RESISTANCE
Range Resolution
200 W
200 KW
0.1 W
100 W
Accuracy
± (1% rdg + 1 dgt)
TEST VOLTAGE : 200W RANGE 3.2V MAX.
200K W RANGE 0.3V MAX.
OL - PROTECTION : 500VDC/350VAC ON ALL RANGE
FREQUENCY (Autoranging)
Frequency function in Model - 2790
Range Accuracy
2 KHz
20 KHz ± (0.5% rdg + 3 dgts)
SENSITIVITY : 80Vrms min.
OL - PROTECTION : 500VDC or AC rms
(50Hz ~ 500Hz).
22

23
!
- +
Maintenance
Warning
To avoid false reading, replace the battery
as soon as the battery indicator appears.
To replace battery :
n Disconnect the connection between the testing
leads and the circuit under test, and remove the
testing leads away from the input terminals of the
Meter.
n Turn the Meter OFF.
n Remove the screws from the battery compartment,
& separate the battery compartment from the case
bottom.
n Remove the battery from the battery compartment.
n Replace the battery with a new Standard 9V
Battery.
n Rejoin the battery compartment and the case
bottom, and install the screw.
warrantees
24