Kusam-meco 2754A User manual

OPERATION
MANUAL
CLAMP-ON
MULTIMETER
2754A
2754A-T(TRUE RMS)
17, Bharat Industrial Estate, T. J. Road, Sewree (W),
Mumbai-400015. INDIA
Sales Direct: 24156638 Tel.:[phone] Fax:[phone]
E-mail : [email protected], Website : www.kusamelectrical.com
www.kusam-meco.co.in
Digital Multimeter
Digital AC & AC/DC Clampmeter
AC Clamp Adaptor
AC/DC Current Adaptor
Transistorised Electronic Analog & Digital
Insulation Resistance Testers
Digital Sound Level Meter & Sound Level
Calibrator
Digital contact & Non-contact Type
Tachometer
Digital Non-contact (infrared) Thermometer
Thermo Hygrometer
Thermo Anemometer
Wood Moisture Meter
Distance Meter
Digital Hand Held Temperature Indicators
Digital Lux Meter
Network Cable Tester
Power Factor Regulator
Maximum Demand Controller/Digital Power
Meter
LIST OF PRODUCTS
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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.
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 first.
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.
TAKE MEASUREMENT CAREFULLY AND YOU’LL
SPARE YOUR METER AND YOURSELF, SOME PAIN
CLAMP-ON
MULTIMETER
2754A
2754A-T(TRUE RMS)

TABLE OF CONTENTS
TITLE PAGE
Safety.......................................................1
Electrical Symbols................................... 3
SPECIFICATIONS
General Specifications............................ 4
Electrical Specifications.......................... 6
AC Voltage ...................................... 6
DC Voltage....................................... 6
Ohms................................................ 7
Diode Tester......................................8
Capacitance......................................8
DCA Current..................................... 8
ACA Current..................................... 9
Product Description................................. 10
Operation................................................ 11
Maintenance............................................ 17
Replacing the Battery.............................. 18
Test Certificate........................................ 19
Warranty.................................................. 20
1) SAFETY
This manual contains information and warnings that
must be followed for operating the instrument safely
and maintaining the instrument in a safe operating
condition. If the instrument is used in a manner not
specified by the manufacturer, the protection provided
by the instrument may be impaired.
The meter meets the requirements for double
insulation to IEC61010-2-032(2002), EN61010-2-
032(2002), UL61010B-2-032(2003):
Category III 600 Volts AC and DC.
PER IEC61010 OVERVOLTAGE INSTALLATION
CATEGORY
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is
energy-consuming equipment to be supplied from the
fixed installation.
Note-Examples include household, office, and
laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is
equipment in fixed installations.
Note - Examples include switches in the fixed
installation and some equipment for industrial use
with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for
use at the origin of the installation. Note - Examples
include electricity meters and primary over-current
protection equipment.
1

2
TERMS IN THIS MANUAL
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
WARNING:
To reduce the risk of fire or electric shock, do not
expose this product to rain or moisture. The meter is
intended only for indoor use.
To avoid electrical shock hazard, observe the proper
safety precautions when working with voltages above
60 VDC or 30 VAC rms. These voltage levels pose a
potential shock hazard to the user.
Keep your hands/ fingers behind the hand/finger
barriers (of the meter and the test leads) that indicate
the limits of safe access of the hand-held part during
measurement. Inspect test leads, connectors, and
probes for damaged insulation or exposed metal
before using the instrument. If any defects are found,
replace them immediately.
This Clamp-on meter is designed to apply around or
remove from uninsulated hazardous live conductors.
But still, individual protective equipment must be used
if hazardous live parts in the installation where
measurement is to be carried out could be accessible.
CAUTION :
Disconnect the test leads from the test points before
changing meter functions.
!
!
3
2) CENELEC Directives
The instruments conform to CENELEC Low-
voltage directive 73/23/EEC and Electro
magnetic compatibility directive 89/336/EEC
Caution ! Risk of electric shock
!
Caution ! Refer to the explanation in this Manual
Application around and removal from
hazardous live conductors is permitted
INTERNATIONAL ELECTRICAL SYMBOLS

4
Display : 3¾ digits 4000 counts LCD display(s)
Update Rate : 3 per second nominal
Polarity : Automatic
Low Battery : Below approx. 2.4V
o o
Operating Temperature : 0 C to 40 C
Relative Humidity : Maximum relative humidity
o
80% for temperature up to 31 C decreasing linearly
o
to 50% relative humidity at 40 C
Altitude : Operating below 2000m
o o
Storage Temperature : -20 C to 60 C, < 80% R.H.
(With battery removed)
Temperature Coefficient : Nominal 0.15 X
o o o o o
(specified accuracy)/ C @(0 C-18 C or 28 C -40 C),
or otherwise specified
Sensing : Average sensing for Model 2754A; True
RMS for Model 2754A-T
Safety : Meets IEC61010-2-032(2002), EN61010-
2-032(2002), UL61010B-2-032(2003)
Category III 600 Volts AC & DC.
Transient protection : 6.5kV (1.2/50mS surge)
Pollution degree : 2
E.M.C. : Meets EN61326(1997, 1998/A1),
EN61000-4-2(1995), and EN61000-4-3(1996)
In an RF field of 3V/m:
Capacitance function is not specified
SPECIFICATIONS
GENERAL SPECIFICATIONS:
5
Other function ranges :
Total Accuracy = Specified Accuracy + 45 digits
Performance above 3V/m is not specified
Overload Protections:
Clamp-on jaws : DC 1000A or AC 800A rms
continuous + & COM terminals (all functions):
600VDC/VAC rms
Power Supply : Standard 1.5V AAA size battery X
2; or 1.5V AAA size alkaline battery X 2
Power Consumption : typical 11mA for ACA/DCA
and 2.9mA for other functions
APO Timing : Idle for 30 minutes
APO Consumption : typical 10mA for Model 2754A
& 190mA for Model 2754A-T
Dimension : 227(L) X 78(W) X 40(H)mm
Weight : 290gm approx
Jaw opening & Conductor diameter : 50mm max
Accessories : Test lead pair, batteries installed,
manual & soft carrying case.

6
Accuracy is ± (% reading digits + number of digits)
or otherwise specified, at 23°C ± 5°C and less than
75% R.H
400.0 mV
600 V
400.0 V
40.00 V
4.000 V
Range
0.3% + 3d
DC VOLTAGE
NMRR : >50dB @ 50/60Hz
Input Impedance : 10MW, 30pF nominal
(1000MWfor 400.0mV range)
CMRR : >120dB @ DC 50/60Hz, Rs =1kW
ELECTRICAL SPECIFICATIONS
True RMS Model 2754A-T ACV & ACA clamp-on
accuracies are specified from 5% to 100% of range or
otherwise specified. Maximum Crest Factor are as
specified below, and with frequency spectrums,
besides fundamentals, fall within the meter specified
AC bandwidth for non-sinusoidal waveofrms.
Accuracy Resolution
0.5% + 3d
1.0% + 4d
50Hz ~ 500Hz
4.000V
1)
400.0mV
Range
AC VOLTAGE
Accuracy Resolution
4.0% + 4d
50Hz ~ 60Hz
40.00V 1.0% + 4d
400.0V
0.1 mV
1 V
0.1 V
0.01 V
0.001 V
0.1 mV
0.001 V
0.01 V
0.1 V
7
60Hz ~ 500Hz
4.000V
Range Accuracy Resolution
600V
2.0% + 4d
50Hz ~ 500Hz
40.00V 1.5% + 4d
400.0V
CMRR : >60dB @DC to 60Hz, Rs =1kW
Input Impedance : 10MW, 30pF nominal
True RMS Model 2754A-T Crest factor :
<1.6:1 at full scale & <3.2:1 at half scale
1)Selection by RANGE button manually, and is
specified from AC 40mV (AC 60mV for True RMS)
and up.
AC VOLTAGE
OHMS
400.0 W
4.000 MW
400.0 KW
40.00 KW
4.000 KW
Range
0.8% + 6d
Open Circuit Voltage : 0.4VDC typical
Accuracy Resolution
0.6% + 4d
1.0% + 4d
40.00 MW
2.0% + 4d
Audible Continuity Tester
Open Circuit Voltage : 0.4VDC typical
Range : 400.0W; Accuracy : 1.5% + 6d
Audible threshold : between 10Wand 120W.
0.001 V
0.01 V
0.1 V
1 V
0.1 W
1 KW
100 W
10 W
1 W
10 KW

8
CAPITANCE
500.0nF
3000mF
500.0mF
50.00mF
5.000mF
1)
Range
1)Additional 50.00nF range accuracy is
not specified
2)Accuracies with film capacitor or better
3)Specified with battery voltage above 2.8V
(approximately half full battery). Accuracy
decreases gradually to 12% at low battery
warning voltage of approximately 2.4V
2)3)
Accuracy Resolution
3.5% + 6d
DCA CURRENT (Clamp-on)
1)Induced error from adjacent current-carrying
conductor : <0.01A/A
2)Relative Zero rmode is applied to offset the
non-zero residual readings, if any
400.0A
400A ~ 800A
0A ~ 400.0A
Range 1) 2)
Accuracy Resolution
1.5% + 4d
1000A
800A ~ 900A 2.0% + 4d
900A ~ 1000A 5.0% + 30d
1.5% + 4d
DIODE TESTER
< 1.6 VDC
Open Circuit Voltage Test Current (Typical)
0.4mA
0.1 nF
1 mF
0.1 mF
0.01 mF
0.001 mF
0.1 A
1 A
9
ACA CURRENT (Clamp-on)
1)Induced error from adjacent current-carrying
conductor : <0.01A/A
2)True RMS Model 2754A-T Crest Factor :
< 1.6:1 at full scale & < 3.2:1 at half scale
3)4.0% + 5d for True RMS Model 2754A-T
4)Accuracy is specified at <50A in this frequency
bandwidth due to limited calibrator output
capability for testing.
400.0A
15Hz~40Hz
Range 1) 2)
Accuracy Resolution
3)
2.0% + 5d
15Hz~40Hz
@400A~600A
1000A
40Hz~100Hz
@400A~600A 1.5% + 4d
15Hz~60Hz
@600A~1000A 5.0% + 30d
3)
2.0% + 5d
40Hz~200Hz
1.5% + 5d
200Hz~400Hz
4)
@<50A
1.5% + 5d
2.0% + 5d
400Hz~1kHz
4)
@<50A
1 A
1 A

10
PRODUCT DESCRIPTION
This user’s manual uses only representative model(S)
for illustrations. Please refer specification details for
function availability to each model.
1) Hall-effect
Clamp Jaw for AC
& DC current
electric field pick
up.
2) Hand/Finger
Barrier to indicate
the limits of safe
access of the
meter during
measurement.
3) Push-buttons for
special functions &
features.
4) Input Jack for all
functions EXCEPT
no-invasive ACA &
D C A c u r r e n t
functions
5) Common (Ground reference) Input Jack for all
functions EXCEPT non-invasive ACA & DCA
current functions
6) Slide-switch Selector to turn the power ON/OFF
And Select a function
7) 3¾ digits 4000 counts LCD display
8) Jaw trigger for opening the clamp jaw
9) Jaw center Indicators, at where best ACA & DCA
accuracy is specified.
1
2
9
9
8
3
3
4
5
6
7
11
DC Voltage and AC Voltage functions
Inputs are made through the test lead
terminals.
Note : DC 400.0mV range is designed with
1000MWhigh input impedance for least current
drain in measuring small signals, and can cope
better with most commercially available voltage
output transducers/adapters. The non-zero
display reading is normal when the meter
inputs are open circuit, which will not affect
actual measurement accuracy.
OPERATION

12
Inputs are made through the clamp jaws for non-
invasive ACA & DCA current measurements.
The meter will show a close to zero reading when the
inputs are shorted. Open input is actually a floating
condition, which is not a zero-volt-input condition.
Note : AC 400.0mV range selection is by RANGE
button manually, and is specified from AC 40mV &
up for Model 2754A and from AC 60mV & up for
True RMS Model 2754A-T.
ACA & DCA CURRENT CLAMP-ON FUNCTION
13
CAUTION
(Application and removal of the Clamp-on meter)
Press the jaw trigger and clamp the jaws around only
one single conductor of a circuit for load current
measurement. Make sure the jaws are completely
closed, or else it will introduce measurement errors.
Enclosing more than one conductor of a circuit will
result in differential current (like identifying leakage
current) measurement. Locate the conductor(s) at
the jaws center as much as possible to get the best
measuring accuracy. The jaw arrow-mark indicates
current flow direction on DCA positive readings. For
removal, press the jaw trigger and remove the jaws
from the conductor(s).
Note : In DCA measurements, hysteresis of the jaws
(after measuring high DC currents) may introduce
non-zero residual readings. Relative Zero rmode
should be used to offset the residual readings, if any,
so as to get more accurate measurements.
Adjacent current-carrying devices such as
transformers, motors and conductor wires will affect
measurement accuracy. Keep the jaws away from
them as much as possible to minimize influence.

14
Using Resistance, Continuity or Diode function in a
live circuit will produce false results and may damage
the instrument. In many cases the suspected
component must be disconnected from the circuit to
obtain an accurate measurement reading.
Inputs are made through the test leads terminals.
Slide-switch on defaults at W. Press SELECT
button momentarily to select Continuity function
which is convenient for checking wiring connections
and operation of switches. A continuous beep tone
indicates a complete wire.
WRESISTANCE AND CONTINUITY
FUNCTIONS
CAUTION
Inputs are made through the test leads terminals.
Slide-switch on defaults at W. Press SELECT button
momentarily 2 times to select Diode test function.
Normal forward voltage drop (forward biased) for a
good silicon diode is between 0.400V to 0.900V. A
reading higher than that indicates a leaky diode
(defective). Azero reading indicates a shorted diode
DIODE TEST FUNCTION
15
(Defective). An OL indicates an open diode
(defective). Reverse the test leads connections
(reverse biased) across the diode. The digital display
shows OL if the diode is good. Any other readings
indicate the diode is resistive or shorted (defective).
CAPACITANCE FUNCTION
Inputs are made through the test leads terminals.
Slide-switch on defaults at W. Press SELECT button
momentarily 3 times to select Capacitance
function. Relative zero rmode can be used to zero
out the parasitic capacitance of the leads and the
internal protection circuitry of the meter when
measuring low capacitance in the order of Pico Farad
(pF).
CAUTION
Discharge capacitors before making any
measurement. Large value capacitors should be
discharged through an appropriate resistance load.
HOLD
The Hold feature freezes the display for later viewing.
Press the HOLD button momentarily to toggle to
the Hold feature. The annunciator “ ” turns on.
MAX
The max feature compares and displays the
measured maximum value as fast as 30ms with auto-
ranging capability. It allows the meter to capture in-
rush currents in current functions. Press and hold the
MAX button for 1 second or more to toggle to the
max feature. The annunciators “MAX” and “ ”
turn on.
H
H
H
H
H
H

16
RELATIVE ZERO rMODE
Relative Zero rmode allows the user to offset the
meter consecutive measurements with the displaying
reading as the reference value. The display will now
show readings relative to the stored reference value.
That is, display= reading - stored value. Press the r
button momentarily to toggle to the relative zero
mode. The annunciator “r“ turns on. The meter
also enters manual ranging mode where available.
The annunciator turns off.
MANUAL OR AUTO-RANGING
Press the RANGE button momentarily to select
manual -ranging mode, and the meter will remain in
the range it was in, the LCD annunciator
turns off. Press the button momentarily again to step
through the ranges. Press and hold the button for 1
second or more to resume auto-ranging mode.
Display Backlight (available in 2754A-T only)
Press the SELECT button for 1 second or more to
toggle the display backlight on and off.
AUTO POWER OFF (APO)
When the meter is on, the Auto Power Off (APO)
feature will switch the meter to sleep mode
automatically after approximately 30 minutes of no
slide-switch nor push button operations to extend
battery life. To wake up the meter from APO, press
any push-buttons momentarily or set the slide-switch
to the OFF position and then slide back on again.
Always set the slide-switch to the OFF position
manually when the meter is not in use.
“AUTO”
“AUTO”
17
MAINTENANCE
WARNING
To avoid electrical shock, disconnect the meter from
any circuit, remove the test leads from the input jacks
and turn OFF the meter before opening the case. Do
not operate with open case.
Trouble Shooting
If the instrument fails to operate, check batteries
and test leads etc., and replace as necessary. Double
check operating procedure as described in this user’s
manual.
If the instrument voltage-resistance input terminal
has subjected to high voltage transient (caused by
lighting or switching surge to the system) by accident
or abnormal conditions of operation, the series fusible
resistors will be blown off (become high impedance)
like fuses to protect the user and the instrument. Most
measuring functions through this terminal will then be
open circuit. The series fusible resistors and the
spark gaps should then be replaced by qualified
technician. Refer to the Warranty section for
obtaining warranty and repairing service.
Cleaning and storage
Periodically wipe the case with a damp cloth and mild
detergent; do not use abrasives or solvents. If the
meter is not to be used for periods of longer than 60
days, remove the batteries and store it separately.
!

MUMBAI
TEST CERTIFICATE
CLAMP-ON MULTIMETER
This Test Certificate warrantees that
the product has been inspected and
tested in accordance with the published
specifications.
The instrument has been calibrated by
using equipment which has already
been calibrated to standards traceable
to national standards.
MODEL NO. ___________
2754A / 2754A - T
SERIAL NO. ___________
DATE: ___________
ISO 9001
REGISTERED
QC
PASS
KUSAM-MECO
18
BATTERY REPLACEMENT
The meter uses standard 1.5V AAA Size battery X 2,
or 1.5VAAAsize alkaline battery X 2.
Loosen the 2 captive screws form the battery cover
case. Lift the battery cover case. Replace the
batteries. Replace battery cover case. Re-fasten the
screws.
19

20
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, burnt PCB's, 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.
21
G-17, Bharat Industrial Estate,
T.J.Road, Sewree (W),
Mumbai - 400015. (INDIA)
Sales Direct : 24156638
Tel : [phone]
Fax : [phone]
Email : [email protected]
Website : www.kusamelectrical.com
Www.kusam-meco.co.in
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.