Kusam-meco KM-DMM-41 Installation manual

MODEL - KM-DMM-41
OPERATION MANUAL
AN ISO 9001:2008 COMPANY
17, Bharat Industrial Estate, T. J. Road, Sewree (W),
Mumbai-400015. INDIA
Sales Direct: [phone] Tel.:[phone]
Fax: [phone] E-mail : [email protected],
Website : www.kusamelectrical.com; www.kusam-meco.co.in
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
AUTO SCAN DIGITAL
MULTIMETER
®®
®®

TAKE MEASUREMENT CAREFULLY AND YOU'LL SPARE YOUR
METER AND YOURSELF SOME PAIN
Nearly every electrical engineer has a hand held Multimeter. We
sometimes take them for granted, until we damage them or "burn them
out" if you incorrectly connect your DMM to a circuit or have the DMM on
wrong setting. You can also get into trouble if you try to measure the
voltage across a charged capacitor.
DMM 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 DMM becomes a lower impedance circuit element. If you
accidentally connect this low impedance path across your circuit, you'll
effectively short-circuit it You can, therefore send high current through
your meter and severly damage it. Unless the meter has a fused input,
you can even get an explosion or fire.
Even if you correctly insert your DMM into the circuit, you can still damage
your meter. Don't try to measure current in excess of your meter's capacity.
Handheld DMMs usually have a maximum current rating of 10A or 20A
Even if you correctly insert your DMM into the circuit, you can still damage
your meter. Don't try to measure current in excess of your meter's capacity.
Handheld DMMs usually have a maximum current rating of 10A or 20A
If you are measuring current in industrial environment. you can easily
exceed those ratings. The best way to avoid damage is to use a clamp
meter or to connect a clamp attachment to your DMM.
To prevent excess current from flowing through your meter, always
disconnect the test leads from the circuit under test whenever you
change DMM functions, Set your meter to the correct function, say
current and its highest range for the setting, say 20A Next, connect the
test leads before you apply power to the circuit To be safe, start by
setting your meter to its highest range first.
1. GENERAL INSTRUCTIONS................................................
1.1 Precaution Safety Measures...............................................
1.1.1 Preliminary.................................................................
1.1.2 During Use.................................................................
1.2 Symbols.....................................................................
1.3 Instructions................................................................
2. DESCRIPTIONS...................................................................
2.1 Instrument Familiarization...................................................
2.2 LCD Display........................................................................
2.3 Key Pad..............................................................................
3. FUNCTION DESCRIPTION..................................................
3.1 General Functions..............................................................
3.1.1 Auto Scan Mode........................................................
3.1.2 Data Hold Mode.........................................................
3.1.3 Manual Ranging And Auto Range Mode....................
3.1.4 True Rms Measurement............................................
3.1.5 Auto Power Off Setting..............................................
3.2 Measurement Functions.....................................................
3.2.1 Ac And Dc Voltage Measurement..............................
3.2.2 Non-contact Electric Field Detector (ef Mode)...........
3.2.3 Resistance Measurement..........................................
TABLE OF CONTENTS
TITLE PAGE NO.
01
01
01
02
04
04
05
05
06
07
09
09
09
10
10
11
11
11
11
12
13

3.2.4 Continuity check........................................................
3.2.5 Diode Test..................................................................
3.2.6 Capacitance measurement........................................
3.2.7 Current measurement................................................
4. TECHNICAL SPECIFICATIONS..........................................
4.1 General specifications........................................................
4.2 Electrical specifications......................................................
4.2.1 AC Voltage.................................................................
4.2.2 DC Voltage.................................................................
4.2.3 Resistance.................................................................
4.2.4 Continuity Check........................................................
4.2.5 Diode Test..................................................................
4.2.6 Capacitance...............................................................
4.2.7 Current.......................................................................
4.2.8 Linear frequency.........................................................
5. MAINTENANCE....................................................................
5.1 General maintenance....................................................
5.2 Fuse replacement.........................................................
5.3 Battery replacement......................................................
6. ACCESSORIES...................................................................
7. TEST CERTIFICATE............................................................
8. WARRANTY ........................................................................
TABLE OF CONTENTS
TITLE PAGE NO.
15
15
17
18
20
20
21
21
21
22
22
22
22
23
24
24
24
24
25
25
26
27
- 01 -
1) GENERAL INSTRUCTIONS
This instrument complies with IEC 61010-1: 2001, CAT III 1000V and CAT
VI 600V overvoltage 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 1.2.
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.
CAT I:- Electronic :-
=Protected electronic equipment
=Equipment connected to (source) circuits in which measures are taken
to limit transient over voltages to an approximately low level.
=Any high-voltage, low-energy source derived from highwinding
resistance transformer, such as the high-voltage section of a copier.
CAT II :- Single-phase receptacle connected loads
=Appliance, portable tools, and other household and similar loads.
=Outlet and long branch circuits.
=Outlets at more than 10 meters (30 feet) from CAT III source.
=Outlets at more than 20 meters (60 feet) from CAT IV source.

- 02-
CAT III :- Three-phase distribution, including single-phase
commercial lighting
=Equipment in fixed installations, such as switchgear and polyphase
motors.
=Bus and feeder in industrial plants.
=Feeders and short branch circuits, distribution panel devices.
=Lighting systems in larger buildings.
=Appliance outlets with short connections to service entrance.
CAT VI :- Three-phase at utility connection, any outdoor conductors
=Refers to the "origin of installation"; i.e., where low-voltage connection
is made to utility power.
=Electricity meters, primary overcurrent protection equipment.
=Outside and service entrance, service drop from pole to building, run
between meter and panel.
=Overhead line to detached building, underground line to well pump
¨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.
protection your own safety, only use the test probes supplied with the
instrument. Before use, check that they are in good condition.
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 stars
=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.
- 03 -
=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 specifications tables.
=When the multimeter is linked to measurement cirucits, 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 and discharge all high-voltage capacitors before
testing resistance, continuity, diodes, or capacitance.
=Never perform resistance or continuity measurement 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 measurement 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.

- 04 -
=Use just one 6F22 battery, proprerly installed in the Meter's battery case
, to 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 1000V in category III, or 600V in category
IV installations.
=Do not operate the Meter with the case (or part of the case) removed.
1.2) Symbols :-
Symbols used in this manual and on the instrument.
Caution :- refer to the instruction manual. Incorrect use may result in
damage to the device or its components.
AC (Alternating Current)
AC (Alternating Current)
AC or DC
Earth ground
Double insulated
Fuse
Conforms to European Union Directives
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 and 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
- 05 -
=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.
RANGE HOLD ~HZ MAX MIN
SELECT
AUTO SCAN
vOLTW
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10A MAX
CATIII 1000V
CATIV 600V
VW
A FUSED COM
600mA MAX
Figure 2-1
8
1
2
3
4
7
5
6
2) DESCRIPTIONS
2.1) Instrument Familiarization

- 06-
The front panel is shown as in figure 2-1 explanation being as
follows:-
1) LCD display:- used for displaying the measuring results and various
symbols.
2) Keypad :- Measurement function keys.
3) Rotary Switch :- Used for selecting measurement functions
4) VW:- Terminal receiving the red test lead for voltage, resistance,
capacitance, diode and continuity measurements.
5) mA/mA :- Terminal receiving the red test lead for mA, mA measurements.
6) A :- Terminal receiving the red test lead for 6A, 10A measurements.
7) COM :- Terminal receiving the black test lead as a common reference.
8) EF :- detection area.
2
3
4
5 6 7 8 9 10 11
12
13
14
15
17
16
2.2) LCD Display
Figure 2-2
- 07-
LCD screen is shown as in Figure 2-2, with its every symbol's
meaning shown as in the Table 1:
No. Symbol Meaning
1)
2)
Indicates for auto power off
Indicates negative readings
3) AC Indicator for AC voltage or current
4) DC Indicator for DC voltage or current
5) Unsafe voltage. voltage ³30V, or voltage overload (OL)
6) SCAN When auto scan mode is selected
7) AUTO The meter is in the Auto range mode in which the meter
automatically selects the range with the best resolution.
8) MANU The meter is in the Manual range mode in which the user
selects the range.
9) HOLD When HOLD function is enabled. When delay-hold is
selected, the HOLD symbol will be blinking for 6 seconds.
10) MAX Display maximum data
11) MIN Display minimum data
Low battery indication (Note: When this symbol appears
it means that the battery needs to be replaced.
12)
13) The meter is in Diode Test mode.
14) The meter is in Continuity check mode
15) mmVA, nmmF,
KMWHz Measurement units
16) 0L This symbol means that the input is too large for the
Selected range.
17) EF The meter is in non-contact electric field detector mode.
2.3) Keypad
2.3.1) SELECT

- 08-
1) When the meter is turned off and the rotary switch is not in position
of OFF, press SELECT key for 2 seconds to turn on the meter and
press the key once more > 2 sec. to turn the power OFF.
2) At EF/VOLT position :- Switches between Auto scan mode, AC &
DC voltage, Non-contact electric field detector (EF mode.)
3) At Wposition :- Switches between Auto scan mode,
Resistance measurement, Continuity check, Diode Test and
Capacitance measurement.
4) At A mA mA position :- Switches between Auto scan mode, DC &
AC current.
5) Power-up Option :- Disables automatic power-off feature.
2.3.2) RANGE
At ACV, DCV, W, , A, mA and 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 and hold RANGE for 2 seconds to return to autoranging.
2.3.3) HOLD
Press it to enter the Data Hold mode. Used to maintain the
measurement data unchanging, by pressing the key again it will exit
the Data Hold mode.
Press this key and last for 2 seconds, the meter will delay for 6
seconds, than enters HOLD mode.
2.3.4) ~Hz
During the voltage or current measurements, by pressing ~Hz key
the meter will enter the linear frequency measurement state. At this
time what being measured is the frequency of voltage or current. By
pressing this key again it will return the voltage or current
measurement state
- 09 -
2.3.5) MAX / MIN
This key is for measuring maximum value and minimum value.
1) Press it to enter Max/Min mode and simultaneously display the
maximum value.
2) Press it again ; the LCD will display the Minimum Value.
3) Press it again ; the LCD will display the current Value.
4) Press and hold it for two seconds, the meter will return to normal
measurement state.
2.3.6)
Press the this key, backlight on; press it again, backlight off.
3.) FUNCTION DESCRIPTION
3.1) General Functions
3.1.1) Auto scan mode :- When the meter is turned on, it will be power-on
reset to auto scan mode. The meter automatically selects the
appropriate measurement mode and range according to the
measured object. In Auto scan mode, press RANGE, HOLD, MAX,
MIN keys are valid, press SELECT key to exit Auto scan mode. In
automatic scan mode, full automatic measurement shown as in the
Table 2:
Measurement
DCV
ACV
Resistance
Capacitance
DCmA
ACmA
DCmA
ACmA
DCA
ACA
Auto ranging
1.0mV~1000V
300.0mV~1000V (60Hz)
0W~6.000MW
1.000nF~600.0mF
0.1mA~6000mA
30.0mA~6000mA (60Hz)
0.01mA~600.0mA
3.00mA~600.0mA (60Hz)
0.01A~10A
3.00A~10A (60Hz)

-10-
3.1.2) 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 HOLD key again.
To enter and exit the Data Hold mode :
1) Press HOLD key (short press). Fixes the display on the current
value, HOLD is displayed.
2) A second short press returns the meter to normal mode.
3) Pressing HOLD key and last for 2 seconds, the HOLD symbol
in LCD will be blinking and the meter will delay for 6 seconds,
than enters HOLD mode.
3.1.3) Manual ranging and Auto range mode.
The Meter has both manual ranging and auto range options.
=In the auto range 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 auto range and lock the meter in a specific range
=The Meter defaults to the auto range mode in measurement
functions that have more than one range. When the Meter is in
the auto range mode, AUTO is displayed.
To enter and exit the manual range mode :
1) Press RANGE key. The Meter enters the manual ranging mode.
AUTO turns off. Each process of RANGE key increments the
range. When the highest range is reached, the Meter wraps to
the lowest range.
Note :- If you manually change the measurement range after entering
the Data Hold modes, the Meter exits this mode.
- 11 -
2) To exit the manual ranging mode, press and hold down RANGE
key for two seconds. The Meter returns to the auto range mode
and AUTO is displayed.
3.1.4) TRUE RMS Measurement
All the measurement values of the true RMS meter on the AC
voltage and AC current are true root-mean-square values. The basic
meter can only measure the AC average value.
3.1.5) Auto power off setting
When the meter is powered on, it is under auto power off mode. The
meter will power itself off after 10 minutes if there is not any operation
Press SELECT for 2 seconds to wake the meter up. You can also
rotate the rotary switch to the position of OFF and then restart the
meter.
To disable the auto power off function, hold down the SELECT key
while turning the meter on. Then the icon will disappear
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 1000Vac rms.
To avoid electrical shock and/or damage to the instrument, do
not apply more than 1000Vdc or 1000Vac rms between the
common terminal and the earthground.
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.
To measure ac or dc voltage (set up and connect the Meter as shown
in Figure 3-1):
1) Set the rotary switch to the position of EF/VOLT.
2) Select auto scan mode or press SELECT key to select between AC
and DC voltage mode.

- 12-
2) Press SELECT key to select non-contact electric field detector mode.
When no or less electric field is detected, the LCD shows "EF".
3) Connect the black and red test leads to the COM and V terminals
respectively.
4) Connect the test leads to the circuit being measured
5) Read the displayed value.
NOTE :- In case of probe hanging in the air, the voltage inducted by
the test leads may cause unstable readings on the display screen,
but that will not affect the accuracy of measurement.
RANGE HOLD ~HZ MAX MIN
SELECT
AUTOSCAN
vOLT W
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10AMAX
CATIII 1000V
CATIV 600V
VW
A FUSED COM
600mAMAX
v
Auto
AC 12.01 V
RANGE HOLD ~HZ MAX MIN
SELECT
AUTOSCAN
vOLT W
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10AMAX
CATIII 1000V
CATIV 600V
VW
A FUSED COM
600mAMAX
+
Auto
DC 12.00 V
Figure3-1 Measuring AC
and DC voltage
AC Voltage DC Voltage
3.2.2) Non-contact electric field detector (EF mode)
It should be a long - distance in measuring high-voltage. Pay
attention to safety.
Electric field is a special substance exist in the charge and the
variable ambient magnetic field.
To detector Non-Contact electric field (set up and connect the
Meter as shown in Figure 3-2):
1) Set the rotary switch to the position of EF/VOLT.
- 13 -
3) Make the detector in the top of the meter approach to the wire. If
the detector senses electric field, the strength will be showed on
LCD by "-" not digits type. And the buzzer will sound. Level 1(weak)
is "-" and the level 4(strong) is "-----" The buzzer frequency depends
on the strength of electric field also. The Faster beeper means the
stronger electric field (ac voltage) is sensed.
Note: Detection Sensibility : > 36V ac rms.
Detection distance : < 10cm, It's related to the source value.
Figure 3-2 Non-contact electric field detector
3.2.3) Resistance measurement
To avoid electrical shock and / or damage to the instrument,
disconnect circuit power and discharge all high-voltage
capacitors before measuring resistance.
Resistance is an opposition to current flow.
The unit of resistance is the ohm (W). The Meter measures resistance
by sending a small current through the circuit. because this current
flows through all possible paths between the probes, an in-circuit
RANGE HOLD ~HZ MAX MIN
SELECT
AUTO SCAN
vOLTW
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10A MAX
CATIII 1000V
CATIV 600V
VW
A FUSED COM
600mA MAX
RANGE HOLD ~HZ MAX MIN
SELECT
AUTO SCAN
vOLTW
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10A MAX
CATIII 1000V
CATIV 600V
VW
A FUSED COM
600mA MAX
AUTO
EF
AUTO

-14-
resistance reading represents the total resistance of all paths between
the probes.
To measures resistance (set up the Meter as shown in figure 3-3) :
1) Set the rotary switch to range.
2) Select auto scan mode or press SELECT key to select resistance
measuring mode.
3) Connect the black and red test leads to the COM and VWterminals
respectively.
4) Connect the test leads to the circuit being measured.
5) Read the displayed value.
Note: In case of performing resistance test on circuit board, it is
necessary firstly to turn off the power of the circuit board and then
perform the measurement. As there may be other parallel circuits,
so the displayed value of test is not surely the actual value of the
resistors
RANGE HOLD ~HZ MAX MIN
SELECT
AUTO SCAN
vOLTW
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10A MAX
CATIII 1000V
CATIV 600V
VW
A FUSED COM
600mA MAX
Auto
100.0k W
Figure 3-3 Measuring Resistance
-15-
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 (set up the Meter as shown in Figure 3-4):
1) Set the rotary switch to range.
2) Select auto scan mode or press the SELECT key to activate
Continuity check.
3) Connect the black and red test leads to the COM and Wterminals
respectively.
4) Connect the test leads to the resistance in the circuit being measured.
5) When the test lead to the circuit is below 30W, a continuous beeping
will indicate it.
RANGE HOLD ~HZ MAX MIN
SELECT
AUTOSCAN
vOLTW
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10AMAX
CATIII 1000V
CATIV 600V
VW
A FUSED COM
600mAMAX
Auto
000.5 W
RANGE HOLD ~HZ MAX MIN
SELECT
AUTOSCAN
vOLT W
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10AMAX
CATIII 1000V
CATIV 600V
VW
A FUSED COM
600mAMAX
Auto
0l. W
ON
Close
OFF
Open
o))) o)))
o))) o)))
Figure3-4 Checking the Continuity
3.2.5) Diode Test
To avoid electrical shock and / or damage to the instrument,
disconnect circuit power and discharge all high-voltage
capacitors before testing diodes.

-16-
use the diode test to check diodes, transistors, and other semiconductor
devices. The diode test sends a current through the semiconductor
junction, 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 (set up the Meter as shown in Figure 3-5):
1) Set the rotary switch to mode.
2) Select the auto scan mode or press the SELECT key to activate Diode
Test.
3) Connect the black and red test leads to the COM and VWterminals
respectively
4) 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.
5) The meter will show the approx. forward voltage of the diode.
6) In a circuit, a good diode (Si) 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.
RANGE HOLD ~HZ MAX MIN
SELECT
AUTOSCAN
vOLTW
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10AMAX
CATIII 1000V
CATIV 600V
VW
A FUSED COM
600mAMAX
Auto
0.640 V
Forward Bias Reverse Bias
Ö
Ö
Anode Cathode Cathode Anode
Ö
RANGE HOLD ~HZ MAX MIN
SELECT
AUTOSCAN
vOLT W
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10AMAX
CATIII 1000V
CATIV 600V
VW
A FUSED COM
600mAMAX
Auto
.0l
Open
V
Ö
Figure3-5 Testing a Diode
-17
3.2.6) 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.
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 measures capacitance by
charging the capacitor with a known current for a known period of time,
measuring the resulting voltage, then calculating the capacitance. The
measurement takes about 1 second per range.
To measure capacitance (set up the Meter as shown in Figure 3-6):
1) Set the rotary switch to range.
2) Select auto scan mode or press the SELECT key to activate
capacitance measuring mode.
3) Connect the black and red test leads to the COM and terminals
respectively.
4) Connect the test leads to the capacitors being measured and read the
displayed value.
Note: The meter may take a few seconds to stabilize reading when
measurement on 600uF~60mF. To improve the accuracy of
measurement less than 600nF, subtract the residual capacitance of
the Meter and leads.

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3) Select the auto scan mode or press the SELECT key to select DCA
or ACA measuring mode.
4) Connect the black test lead to the COM terminal and the red test
leads to the mA/mA terminal for a maximum of 600mA. For a
maximum of 10A, move the red test lead to the A terminal.
5) Break the circuit path to be tested.
Touch the black probe to the more negative side of the break;
touch the red probe to the more positive side of the break.
(Reversing the leads will give a negative reading, but will not
damage the Meter.)
RANGE HOLD ~HZ MAX MIN
SELECT
AUTO SCAN
vOLT W
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10A MAX
CATIII 1000V
CATIV 600V
VW
A FUSED
600mA MAX
mA
mA
A
DC AUTO
20.56
m A
OFF (Open)
OFF (Open)
ON (close)
COM
Figure 3-7 Measuring Current
1) Turn off power to the circuit. Discharge all high voltage capacitors.
2) Set the rotary switch to the mA, mA or A range.
Current is the flow of electrons through a conductor.
To measure current (set up the Meter as shown in Figure 3-7):
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RANGE HOLD ~HZ MAX MIN
SELECT
AUTO SCAN
vOLT W
OFF mA
....
mA
....
A
....
AUTO SCAN
AC/DC
RANGE
Extra-Safety
Multimeter
mA
mA
10A MAX
CAT III 1000V
CAT IV 600V
VW
A FUSED COM
600mA MAX
Auto
10.12n F
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 1000V.
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 probes in parallel with a
circuit or component when the leads are plugged into the
current terminals.
3.2.7) Current measurement
Figure 3-6 Measuring Capacitance

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4) TECHNICAL SPECIFICATIONS
4.1) General specifications
Environment conditions :- 1000V CAT III and 600V CAT IV
Pollution degree :- 2
Altitude :- < 2000m
Operating temperature :- 0~40°C, 32°F~122°F (<80% RH, <10°C
non-condensing)
Storage temperature :- -10~60°C, 14°F~140°F (<70% RH, battery
removed)
Temperature coefficient :- 0.1 x (specified accuracy) / °C (<18°C or
> 28°C)
MAX. Voltage between terminals and earthground :- 1000V AC rms
or 1000V DC.
Fuse Protection :- mA and mA : F 0.63A / 1000V Æ10.3 x 38; F 10A /
1000V Æ10.3 x 38.
Sample Rate :- 3 times/sec for digital data.
Display :- 3 5/6 digits LCD display. Automatic indication of function and
symbols.
Range selection :- Automatic and manual.
Over Range indication :- LCD will display "OL".
Low battery indication :- The " " is displayed when the battery is
under the proper operation range.
Polarity source :- 9V
Battery type :- 6F22.
Dimension :- 190 (L) x 90 (W) x 40 (H) mm
Weight :- 500g. Approx. (battery included).
6) Turn on power to the circuit; then read the display. Be sure to note
the measurement units at the right side of the display (mA, mA or A).
When only the figure "OL" displayed, it indicates overrange situation
and the higher range has to be selected.
7) Turn off power to the circuit and discharge all high voltage capacitors
Remove the Meter and restore the circuit to normal operation.
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4.2.1) AC voltage
Accuracy is specified for one year after calibration, at operating
temperature of 18°C to 28°C, with relative humidity at less than 80%
Accuracy specifications take the form of : ± (% of Reading + Number
of Least significant Digits)
4.2) Electrical specifications
Range Resolution
Accuracy
600mV
6V
60V
600V
1000V
0.1mV
1mV
10mV
100mV
1V
60Hz 40Hz ~ 400Hz
± (1.0%rdg+3dgts)
± (1.0%rdg+3dgts)
± (1.0%rdg+3dgts)
± (1.5%rdg+5dgts)hh
± (1.0%rdg+3dgts)
Above accuracy can be guaranteed 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.
4.2.2) DC voltage
Range Resolution Accuracy
600mV
6V
60V
600V
1000V
0.1mV
1mV
10mV
100mV
1V
± (0.5%rdg+5dgts)
± (0.8%rdg+5dgts)
± (0.8%rdg+5dgts)
± (0.8%rdg+5dgts)
± (1.0%rdg+2dgts)

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4.2.7) Current
Range Resolution Accuracy
600mA
6000mA
60mA
600mA
10A
0.1mA ± (1.0%+3)
0.1mA
1mA
0.01mA
0.1mA
10mA
± (1.0%rdg+3dgts)
± (1.5%rdg+3dgts)
± (1.8%rdg+5dgts)
Range Resolution Accuracy
600mA
6000mA
60mA
600mA
10A
0.1mA ± (1.0%+3)
0.1mA
1mA
0.01mA
0.1mA
10mA
± (1.5%rdg+5dgts)
± (1.8%rdg+8dgts)
± (2%rdg+8dgts)
ACA:
Above accuracy can be guaranteed 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
Overload protection :- F 10A/1000V fuse for 10A range.
F 0.63A/1000V fuse for mA and mA ranges
Maximum input current :- 600mA dc or 600mA ac rms for mA and
mA ranges, 10A dc or 10 ac rms for
10A ranges.
For measurements > 6A, 4 minutes maximum ON to measure 10
minutes OFF; Above 10A unspecified.
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4.2.3) Resistance
Range Resolution Accuracy
600.0W
6.000kW
60.00kW
600.0kW
6.000MW
60.00MW
0.1W
1W
10W
100W
1kW
10kW
± (1.2%rdg +2 dgts)
± (2%rdg+5dgts)
4.2.4) Continuity check
Function Resolution Resolution
o)))) 600W0.1W
Test condition : Forward DC current approximately 1mA. Reversed
DC voltage approximately 2.8V.
Description :- Continuity beeper £30W
4.2.5) Diode Test
Range Resolution Test condition
2 V 0.001V Forward DC current : approx. 1mA
Reversed DC voltage : approx. 2.8V
4.2.6) Capitance
Range Resolution Accuracy
6nF
60nF
600nF
6mF
60mF
600mF
6mF
60mF
1pF
10pF
100pF
1nF
10nF
100nF
1mF
10mF
± (5.0%rdg+5dgts)
± (3.0%rdg+3dgts)
Uncertainty
± (5.0%rdg+3dgts)

- 25-
1) Set rotary switch to the OFF position.
2) Disconnect test leads and / or any connectors from the terminals.
3) Use a screwdriver to unlock the four screws on the rear cover.
4) Take out the rear cover from the meter.
5) Remove the fuse by gently prying one end loose, then sliding the
fuse out of its bracket.
6) Install the replacement fuses only with specified ratings: F 0.63A /
1000V Æ10.3 x 38 and F 10A / 1000V Æ10.3 x 38
7) Rejoin the rear cover and tighten the screws.
5.3) 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.
1) Set rotary switch to the OFF position.
2) Disconnect test leads and / or any connectors from the terminals.
3) Use a screwdriver to unlock the two screws on the battery cover.
4) Take out the battery cover from the meter.
5) Remove the used battery.
6) Replace with one new 9V battery (6F22).
7) Rejoin the rear cover and tighten the screws.
6) ACCESSORIES
Delivered with the multimeters:
=User's manual One piece
=Test leads One piece
If there are some changes in accessories, please refer to the real
product as standard.
- 24 -
4.2.8) Linear Frequency.
Range Resolution Accuracy
6kHz
10KHz
0.001HZ
0.01HZ ± (0.05%rdg+8dgts)
Above accuracy can be guaranteed within 10%~100%
of the full range.
5) MAINTENANCE
This section provides basic maintenance information, including fuse
and battery replacement instructions.
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 and / 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.
5.2) Fuse replacement
Before replacing the fuse, disconnect test leads and/or
any connectors from any circuit under test. To prevent
damage or injury replace the fuse only with specified ratings.
NOTE
To measure 220V 50Hz signal, then use ACV function and press Hz
key to read the 50Hz, that is linear frequency.
To measure 5V 100KHz, then use Hz function to read 100KHz, that
is logic frequency (like TTL level).

- 27 -
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.
All transaction are subject to Mumbai Jurisdiction.
“KUSAM-MECO” authorized dealer shall extend this warranty on new &
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.
MUMBAI
TEST CERTIFICATE
AUTO SCAN DIGITAL 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. ________________
KM 41
SERIAL NO. ___________
DATE: ___________
ISO 9001
REGISTERED
QC
PASS
KUSAM-MECO
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