Kusam-meco KM 235 User manual

®®
AN ISO 9001:2015 COMPANY
MODEL - KM 235
TRMS
DIGITAL MULTIMETER
OPERATION MANUAL
G 17, Bharat Industrial Estate, T. J. Road,
Sewree (W), Mumbai - 400 015. INDIA.
Sales Direct : [phone], 27754546.
Tel. : [phone].
Email : [email protected]
Website : www.kusamelectrical.com
®
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

® ®
TRMS
DIGITAL MULTIMETER
MODEL - KM 235
TABLE OF CONTENTS
TITLE PAGE NO.
I. Safety...........................................................
II. Cenelec Directives......................................
III. Special Features.........................................
IV. General Specifications...............................
V. Electrical Specifications.............................
VI. Product Description...................................
VII. Maintenance...............................................
VIII. Test Certificate..........................................
IX. Warranty......................................................
01
03
04
04
06
13
25
27
28

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01
I) SAFETY :
Terms in this manual :
WARNING : Identifies conditions and actions that could result in
serious injury or even death to the user.
This manual contains information and warnings that must be
followed for operating the meter safely and maintaining the meter
in a safe operating condition. If the meter is used in a manner not
specified by the manufacturer, the protection provided by the meter
may be impaired.
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.
Keep your hands/fingers behind the hand/finger barriers (of the
meter and the test probe assembly, where applicable) that
indicate the limits of safe access of the hand-held parts during
measurements. Inspect lead wires, connectors, and probes for
damaged insulation or exposed metal before using the meter. If
any defects are found, replace them immediately. Only use the
probe assembly provided with the meter or a UL Listed Probe
Assembly to the same meter ratings or better.
IEC 61010-031 requires exposed conductive test probe tips to be
≤ 4mm for CAT III & CAT IV ratings. Refer to the category markings
on your probe assemblies as well as on the add-on accessories
(like detachable Caps or Alligator Clips), if any, for applicable rating
changes.
02
Observe proper safety precautions when working with voltages
above 33 Vrms, 46.7 Vpeak or 70 VDC. These voltage levels pose
In other words, the meter will intelligently avoid entering the APO
a potential shock hazard to the user. Before and after hazardous
voltage measurements, check the voltage function on a known
source such as line voltage to determine proper meter functioning.
CAUTION
Disconnect the test leads from the test points before changing
functions.
Measurement Category IV is applicable to test and measuring
circuits connected at the source of the building's low-voltage
MAINS installation. Examples are measurements on devices
installed before the main fuse or circuit breaker in the building
installation.
Brief Information about Measurement Categories
INTERNATIONAL ELECTRICAL SYMBOLS :
Caution ! Refer to the explanation in this Manual
Caution ! Possibility of electric shock
Earth (Ground)
Meter protected throughout by Double Insulation or
Reinforced insulation
Fuse
Direct Current (DC)
Alternating Current (AC)
3 Phase Alternating Current
3
Marking of Electrical and Electronic Equipment (EEE).
Do not dispose of this product as unsorted municipal
waste. Contact a qualified recycler

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03
Measurement Category III is applicable to test and measuring
circuits connected to the distribution part of the building's low-
voltage MAINS installation. Examples are measurements on
distribution boards (including secondary meters), circuit-breakers,
wiring, including cables, bus-bars, junction boxes, switches,
socket-outlets in the fixed installation, and equipment for industrial
use and some other equipment such as stationary motors with
permanent connection to the fixed installation.
Measurement Category II is applicable to test and measuring
circuits connected directly to utilization points (socket outlets
and similar points) of the low-voltage MAINS installation.
Examples are measurements on MAINS CIRCUITS of
household appliances, portable tools and similar equipment.
II) CENELEC DIRECTIVES :
The instruments conform to CENELEC Low-voltage directive
2014/35/EC, Electromagnetic compatibility directive
2014/30/CU and RoHS directive 2011/65/EU.
04
IV) GENERAL SPECIFICATIONS :
— Sensing : True RMS sensing
— Display : 3-5/6 digits 6,000 counts
— Update Rate : 5 per second nominal
o o
— Operating Temperature : -10 C to 45 C
— Relative Humidity : Maximum relative humidity 80% for
o
temperature up to 31 C decreasing linearly to 50% relative
o
humidity at 45 C.
— Altitude : Operating below 2000m.
o o
— Storage Temperature : -20 C ~ 60 C, < 80% R.H.
(with battery removed).
— Temperature Coefficient : Nominal 0.15 x (specified accuracy)/
o o o o o
C @ (-10 C ~ 18 C or 28 C ~ 45 C), or otherwise specified.
— Ingress Protection : IP40
— Pollution Degree : 2
— Safety : Certified per IEC/UL/EN61010-1 Ed. 3.0,
IEC/UL/EN61010-2-030 Ed.1.0, IEC/UL/EN61010-2-033 Ed.1.0,
IEC/UL/EN61010-031 Ed. 1.1 and the corresponding.
CAN/CSA-C22.2 regulations to Measurement Categories:
CAT II 1000V, CAT III 600V and CAT IV 300V AC & DC.
— Transient Protection : 6.0kV (1.2/50ms surge).
— E.M.C. : Meets EN61326-1:2013
In an RF field of 3V/m:
III) SPECIAL FEATURES :
— BeepLit™ Continuity
— Backlighted LCD
— EF-Detection (NCV)
— BeepJack™ on mAmA/A
terminal
— AutoV (Loz)
— VFD
— Auto-ranging MAX/MIN/
AVG Record
— Display Hold
Auto-ranging Relative —
Zero mode

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05
Temperature function is not specified
Ohm function :
Total Accuracy = Specified Accuracy + 15 digits
Other functions :
Total Accuracy = Specified Accuracy
Performance above 3V/m is not specified
— Overload Protection :
A & mA : 0.4A/1000V DC/AC rms, IR 30kA, F fuse or betterm
A : 11A/1000V DC/AC rms, IR 20kA, F fuse or better
V & AutoV : 1100V DC/AC rms
mV, Ohm & others : 1000V DC/AC rms
— Low Battery : Below approx. 2.5V
— Power Supply : 1.5V AAA Size battery X 2
— Power Consumption (typical) : 3.2mA
— APO Consumption (typical) : 10mA
— APO Timing : Idle for 30 minutes
— Dimension : 161*80*50mm L*W*H (With Holster)
— Weight : Approx. 334 gm (With Holster)
— Accessories : Test lead pair; Batteries installed; User's manual,
BKP60 banana plug type-K thermocouple.
— Optional Purchase Accessories : BKB32 banana plug to
type-k socket plug adaptor, BMH-01 magnetic hanger;
BMP-25x soft carrying pouch.
06
V) ELECTRICAL SPECIFICATIONS :
Accuracy is given as ±(% of reading digits + number of digits) or
o o
otherwise specified @ 23 C ± 5 C ACV & ACA accuracies are
specified from 1 % to 100 % of range or otherwise specified.
Maximum Crest Factor <2:1 at full scale & <4:1 at half scale, and
with frequency components fall within the meter specified frequency
bandwidth for non-sinusoidal waveforms
AC VOLTAGE
Input Impedance: 10MW, 54pF nominal
1) <5d non-zero residue may appear when backlight is on, which
will not affect the specified measuring range and accuracy
Accuracy
50Hz ~ 60Hz
600.0V ±(0.7%rdg+3dgts)
±(2.0%rdg+3dgts)
1)
6.000V
1000 V
60.00V
45Hz ~ 440kHz
600.0V
60.00V
1000 V
1)
6.000V
Range Resolution
1 mV
10 mV
100 mV
1 V
1 mV
10 mV
100 mV
1 V

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07
DC VOLTAGE
ACmV
Input Impedance : 10MW, 54pF nominal
1) <5d non-zero residue may appear when back light is on,
which will not affect the specified measuring range and
accuracy
2) Signal peak absolute values, including DC bias, less than
130mVpeak
3) Signal peak absolute values, including DC bias, less than
1300mVpeak
Input Impedance : 10MW, 54pF nominal
Range
500Hz ~ 800Hz
10Hz ~ 500Hz
1)2)
60.00mV
Accuracy
±(2%rdg+3dgts)
±(1%rdg+3dgts)
3)
600.0mV
1)2)
60.00mV
3)
600.0mV
Resolution
Accuracy
±(0.3%rdg+2dgts)
±(0.4%rdg+2dgts)
±(0.4%rdg+2dgts)
±(0.2%rdg+2dgts)
60.00mV
600.0V
1000V
60.00V
600.0mV
6.000V
Range Resolution
10 mV
100 mV
10 mV
100 mV
10 mV
100 mV
1 mV
10 mV
100 mV
1 V
08
1) Not specified for fundamental frequency > 400Hz
2) Accuracy linearly decreases from 1% + 3d @100Hz to
10% + 3d @400Hz
VFD_ACV (with Low Pass Filter )
Range
10Hz ~ 100Hz (Fundamental)
100Hz ~ 400Hz (Fundamental)
±(1.0%rdg+3d)
2)
±(10%rdg+3d )
600.0V
600.0V
1000V
Accuracy
1000V
Resolution
Ohm
1) Open Circuit Voltage : 1.6VDC typical
2) Constant Test Current : 0.2mA Typical
3) Constant Test Current : 0.02mA Typical
4) 5%+20d @ >30WM
0.3% + 3d
1)
Range
Accuracy
600.0W
0.5% + 3d
60.00kW
4)
0.9% + 2d
2)
6.000MW
Resolution
6.000kW
600.0kW
3)
60.00MW
100 mV
1 V
100 mV
1 V
100 mW
1 W
10 W
100 W
1 kW
10 kW

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09
AutoV_ACVAutoV_ACV
RangeRange
45Hz ~ 440Hz45Hz ~ 440Hz
600.0V600.0V
AccuracyAccuracy¹
±(2%rdg+3dgts)±(2%rdg+3dgts)
1000V 1000V
ResolutionResolution
100 mV100 mV
1 V1 V
1)Not specified at <1VAC
Threshold: > 1VAC nominal
Approximate input impedance (//164pF) for reference:
At direct input 50Vac (typical) from quiescence:
>8MΩ@ < 5.6Vac
22kΩ@ 7Vac
12kΩ@ 8Vac
2.6kΩ@ 50Vac
At direct input >>50V (typical) from quiescence:
Initial impedance is approximately 2.3kΩ. Impedance increases
abruptly within a fraction of a second as display voltage
(hard signal) is much higher than 50V
(typical). End-up impedances vs display voltages typically are:
12kΩ@100V
100kΩ@300V
240kΩ@600V
580kΩ@1000V
AutoV_DCV
Range
600.0V
Accuracy¹
±(2%rdg+3dgts)
1000V
Resolution
100 mV
1 V
1)Not specified at <1VDC
Threshold: > +1.0VDC or < -1.0VDC nominal
Approximate input impedance (//164pF) for reference:
At direct input < 50Vdc (typical) from quiescence:
10
AC Current
Range Burden VoltageAccuracy
600.0mA
6000mA
60.00mA
600.0mA
1)
6.000A
2)
10.00A
0.1mV/mA
1.9mV/mA
0.04V/A
1.5% + 3d
1.0% + 3d
Resolution
1) <5d non-zero residue may appear when backlight is on, which
will not affect the specified measuring range and accuracy
2) 10A continuous, >10A to 20A for 30 seconds max with 5 minutes
cool down interval
50HZ ~ 400HZ
100 nA
1 mA
10 mA
100 mA
1 mA
10 mA
>8MΩ@ < 8Vdc (Protection clamping threshold)
25kΩ@ 9Vdc
13kΩ@ 10Vdc
2.6kΩ@ 50Vdc
At direct input >>50V (typical) from quiescence:
Initial impedance is approximately 2.3kΩ. Impedance increases
abruptly within a fraction of a second as display voltage
(hard signal) is much higher than 50V\ (typical). End-up impedances
vs display voltages typically are:
12kΩ@100V
100kΩ@300V
240kΩ@600V
580kΩ@1000V
±(0.9%rdg+2d)
Diode Tester
Range Accuracy
3.000V
Test Current : 0.3mA typical
Open Circuit Voltage : < 3.2VDC typical
Resolution
100 mV

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11
Line Frequency
60mV
6V
60V
600V
VFD 600V
VFD1000V
600mA
60mA
1000V
5V
50mV
10V
50V
50V
500V
500V
500mA
50mA
10Hz - 50kHz
10Hz - 50kHz
10Hz - 50kHz
10Hz - 1kHz
10Hz - 1kHz
10Hz - 1kHz
10Hz - 5kHz
10Hz - 5kHz
6A, 10A 8A 50Hz - 1kHz
10Hz - 1kHz
Range
Function Sensitivity (Sine RMS)
600mV
6000mA
600mA
DC Current
Range Burden VoltageAccuracy
600.0mA
6000mA
60.00mA
600.0mA
6.000A
1)
10.00A
0.1mV/mA
1.9mV/mA
0.04V/A
1.0% + 3d
0.7% + 3d
10A continuous, >10A to 20A for 30 seconds max with
5 minutes cool down interval
Resolution
100 nA
1 mA
10 mA
100 mA
1 mA
10 mA
12
BeepLit™ Continuity Tester
Continuity Threshold : Between 30W and 480W
Continuity ON Response Time : <15ms
Audible Indication : Beep sound
Visible Indication : LCD Backlight
Capacitance
Accuracies with film capacitor or better
±(1.5%rdg+2d)
±(1.5%rdg+8d)
Accuracy
2000nF
20.00nF
20.00mF
200.0nF
200.0mF
2000mF
±(4.5%rdg+10d)
10.00mF
Range
Resolution
10 pF
100 pF
1 nF
10 nF
100 nF
1 mF
10 mF
1)Accuracies assume meter interior and the ambient have reached
the same temperature (isothermal stage) for a correct junction voltage
compensation. Allow enough settling time for a significant change of
ambient temperature. It can take up to an hour for changes > 5°C.
2)Type-K thermocouple range & accuracy not included
Temperature
Range
-40.0 ºC~99.9 ºC
100 ºC~400 ºC
-40.0 ºF~99.9 ºF
100 ºF~752 ºF
1% + 1 ºC
1% + 2 ºF
Accuracy1) 2)

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14
triangle, pulse trains, spikes, as well as distorted waveforms with
the presence of harmonics. Harmonics may cause :
1) Overheated transformers, generators and motors to burn out
faster than normal
2) Circuit breakers to trip prematurely
3) Fuses to blow
4) Neutrals to overheat due to the triplen harmonics present on
the neutral
5) Bus bars and electrical panels to vibrate
Crest Factor
Crest Factor is the ratio of the Crest (instantaneous peak) value
to the True RMS value, and is commonly used to define the
dynamic range of a True RMS DMM. A pure sinusoidal waveform
has a Crest Factor of 1.414. A badly distorted sinusoidal
waveform normally has a much higher Crest Factor.
4) OPERATION
CAUTION
Before and after hazardous voltage measurements, test the
voltage function on a known source such as line voltage to
determine proper meter functioning.
AutoV (LoZ) mode
AutoV automatically selects measurement function of DCV or
ACV, based on their input levels via the test leads. The input also
provides a low ramp-up impedance (LoZ) to drain ghost voltages*.
13
1. 3-5/6 digits 6000 counts
LCD display
2. Push-buttons for special
functions & features
3. Selector to turn the Power
On or Off and Select a
function
4. Input Jack for 10A (20A
for 30sec) current
function
5. Input Jack for all functions
EXCEPT µA, mA & A current
functions
6.
Common (Ground
reference) Input Jack for
all functions
7. Input Jack for µA and mA
current function
VI) PRODUCT DESCRIPTION :
Note : Top of the line model is used as representative for illustration
purposes. Please refer to your particular model for function
availability.
True RMS :
RMS (Root-Mean-Square) is a term used to describe the effective
or equivalent DC value of an AC signal. True RMS is the term which
identifies a DMM that responds accurately to the effective RMS
value regardless of the waveforms such as: square, sawtooth,

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16
AutoV mode input impedance increases abruptly from initial 2.1kΩ
to a few hundred kΩ's on high voltage hard signals. “LoZ” displays
on the LCD to remind the users of being in such low impedance
mode. Peak initial load current, while probing 1000VAC for example,
can be up to 673mA (1000V x 1.414 / 2.1kΩ), decreasing abruptly to
approx. 2.4mA (1000V x 1.414 / 580kΩ) within a fraction of a second.
Do not use AutoV mode on circuits that could be damaged by such
low input impedance. Instead, use rotary selector or high input
impedance voltage modes to minimize loading for such circuits.
WARNING :
ACV, DCV & VFD-ACV functions
Press the SELECT button momentarily to select the subject
functions in sequence. Last selection will be saved as power up
default for repeat measurement convenience.
VFD-ACV and the associated Hz are equipped with digital low-pass
filter (DSP), and are capable of handling VFD (Variable Frequency
Drives) signals for fundamental V & Hz readings. It also improves
ACV and Hz reading stability when being used in most noisy
electrical environments.
Note:
V
~V
15
● With no input, the meter displays “- - - -” when it is ready.
● When a signal above the voltage threshold of 1V DC or
AC up to the rated 1000V is present, the meter displays the
voltage value in appropriate DC or AC, whichever larger in
peak magnitude.
*Ghost-voltage Buster: Ghost-voltages are unwanted stray signals
coupled from adjacent hard signals, which confuse common
multimeter voltage measurements. The AutoV mode provides low
(ramp-up) input impedance (approx. 2.1kΩ at low voltage) to drain
ghost voltages leaving mainly hard signal values on meter
readings. It is an invaluable feature for precise indication of hard
signals, such as distinguishing between hot and open wires (to
g r o u n d ) i n e l e c t r i c a l i n s t a l l a t i o n a p p l i c a t i o n s .
*Only HOLD, EF & Backlight push-button features are available
in AutoV mode.
Note :

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18
BeepLitTM Continuity function is having improved convenience
for checking wiring connections and operation of switches. A
continuous beep tone together with flashing display backlight
indicate a complete wire. Such audible and visible indications
improve continuity readabilities in noisy working environments.
CAUTION
Using resistance and continuity 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 reading
Press the SELECT button momentarily to select the subject
functions in sequence. Last selection will be saved as power
up default for repeat measurement convenience.
ACmV & DCmV; Temperature ºC & ºF
17
TM
Resistance, BeepLit Continuity”;
Press the SELECT button momentarily to toggle the functions. Last
selection will be saved as power up default for repeat measurement
convenience.
Line Frequency functions
Press the Hz push-button momentarily to toggle Hz function.
It is only available to Voltage and Current related ranges.
Input sensitivity varies automatically with the function range
selected while activating the Hz function. 6V function range has
the highest and the 1000V range has the lowest. When activated
under DCV, ACV or VFD-ACV voltage function, the trigger voltage
range will be displayed right before starting the Hz readings.
Press momentarily the RANGE button can manually select another
trigger voltage range (not available to current ranges). It is
recommended to first measure the signal voltage (or current) level
and activate Hz function in that range to get the most appropriate
trigger level. If the Hz reading becomes unstable, select lower
sensitivity to avoid electrical noise. If the reading shows zero,
select higher sensitivity.

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Note: Be sure to insert the banana plug type-K temperature bead
probe Bkp60 with correct + - polarities. You can also use a plug
adapter Bkb32 (Optional purchase) with banana pins to type-K
socket to adapt other standard type-K mini plug temperature probes.
mA, mA and A Current
Press SELECT button momentarily to toggle between DC and AC.
Last selection will be saved as power up default for repeat
measurement convenience.
20
Application notes for flame sensors:
DCmA function is useful for HVAC/R flame sensor applications.
The 0.1mA resolution can identify the minute current changes in
flame detector applications. Flame signal current check should
indicate steady flame signal of at least 2mA for a rectification type,
or 1.5mA for an ultraviolet type (8mA for self checking systems). If a
flame signal current with inadequate strength or fluctuation beyond
10%, check the following to avoid the risk of unwanted flame relay
dropout :
For gas flames (Flame Rod):
· Ignition interference (A flame signal current difference with the
ignition both on and off greater than 0.5µA indicates the presence
of ignition interference)
· Insufficient ground (must be at least 4 times the detector area)
· Flame lifting off burner head (ground), or not continuously in
contact with the flame rod
· Temperature in excess of 600 ºF (316 ºC) at the flame electrode
insulator causing short to ground.
For gas or oil flames (Minipeeper) :
· Low supply voltage
· Detector location
· Defective detector wiring
· Dirty viewing windows
· Faulty Minipeeper
For oil flames (Photocell) :
· Detector location & wiring
· Smoky flame or poorly adjusted air shutter
· Faulty Photocell
· Temperature over 165 ºF (74 ºC) at photocell

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22
Electric Field EF-Detection
Press the EF button momentarily to toggle EF-Detection feature.
The meter displays “EF-H” when it is ready. If it is too sensitive
for your applications, press (Level) button momentarily toggles to
lower sensitivity “EF-L”. The detected Electric Field strength is
indicated as a series of bar-graph segments on the display plus
variable beep tones.
· Non-Contact EF-Detection : An antenna is located along the
top-left end of the meter, which detects electric field surrounding
energized live conductors. It is ideal for tracing live wiring
connections, locating wiring breakages and to distinguish
between live and earth connections.
● Probe-Contact EF-Detection : For more precise indication
of live wires, such as distinguishing between Live and Ground
connections, use direct contact testing with one single test-probe
via the input terminal COM or V. The COM terminal (Black) has
the best sensitivity.
21
Capacitance; Diode
Press the SELECT button momentarily to toggle the functions. Last
selection will be saved as power up default for repeat measurement
convenience.
In Diode function, the 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). A zero reading
indicates a shorted diode (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).
CAUTION
Discharge capacitors before making any measurement. Large
value capacitors should be discharged through an appropriate
resistance load.

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24
Manual or Auto-ranging
For most auto-ranging functions (LCD turns on by default),
press the RANGE button momentarily to select manual-ranging
override. The meter will remain in the range it was in, the LCD
turns off. Press the button momentarily again to select the
next range. Press and hold the button for 1 second or more to
resume auto-ranging.
AUTO
AUTO
Note : Manual-ranging feature is not available to Auto-V,
Capacitance & Hz functions.
The meter beeps as well as displays “InEr” to warn the user
against possible damage to the meter due to improper connections
to the A, mA, or A input jacks when another function, especially a
voltage function, is selected.
Beep-Jack™ Input Warning
Intelligent Auto-Power-Off (APO)
The Auto-Power-off (APO) mode turns the meter off automatically
to extend battery life after approximately 32 minutes of no specified
activities, where applicable:
Relative Zero ( ) mode
Relative Zero allows the user to offset the meter consecutive
measurements with the displaying reading as the reference value.
Practically all displaying readings can be set as relative reference
value including MAX/MIN/AVG feature readings. Press the
button for one second or more to toggle Relative Zero mode.

23
MAX/MIN/AVG Record mode
Press REC button momentarily to activate MAX/MIN/AVG recording
mode. The LCD “MAX MIN AVG” turn on. The meter beeps when
new MAX (maximum) or MIN (minimum) reading is updated.
Press the button momentarily to read the MAX, MIN, AVG readings
in sequence. Press the button for 1 second or more to exit
MAX/MIN/AVG recording mode. Auto-ranging remains, and
Auto-Power-Off is disabled automatically in this mode.
Backlighted LCD display
Press the SELECT button for 1 second or more to toggle the
LCD backlight. The backlight will also be turned off automatically
after 10 minutes to extend battery life.
Hold
The hold feature freezes the display for later view. Press the HOLD
button momentarily to toggle the hold feature.

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VII) 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. Install
only the same type of fuse(s) or equivalent
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 battery and store it
separately
In other words, the meter will intelligently avoid entering the APO
mode when it is under normal measurements. To wake up the
meter from APO, press the SELECT button momentarily and
release, or turn the rotary switch OFF and then back on. Always
turn the rotary switch to the OFF position when the meter is not
in use
1) Rotary switch or push button operations
2) Significant measuring readings of above 8.5% of ranges
3 ) Non-OL readings for Resistance, Continuity or Diode function
4) Non-zero readings for Hz function
5) Electric field signal present for EF function
6) Significant movement indication as in Phase Rotation functions
25
Trouble Shooting
If the instrument fails to operate, check battery, fuses, leads, etc.,
and replace as necessary. Double check operating procedure as
described in this user's manual
Battery use :
1.5V AAA Size battery x 2
Fuse use :
Fuse F1 for µAmA current input:
0.4A/1000V DC/AC, IR 30kA
F fuse or better; Dimension :
6 x 32mm
Battery and Fuse
replacement:
Loosen the screw from the
access cover of the case
bottom. Lift the access cover.
Replace the batteries or fuse.
Re-fasten the screw.
Fuse F2 for A current input:
11A/1000V DC/AC, IR 20kA F
fuse or better;
Dimension: 10 x 38mm
26

®®
28
WARRANTY
This warranty extends only to the original buyer or end-user customer
of a “KUSAM-MECO” authorized dealer.
THIS WARRANTY IS BUYER’S SOLE AND E XCLUSIVE
REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
ANY IM PLIED WA RRANTY OF MERCHAN TABILITY 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.
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”.
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.
“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.
27
MUMBAI
TEST CERTIFICATE
TRMS 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 235
SERIAL NO. ___________
DATE: ___________
ISO 9001
REGISTERED
QC
PASS
KUSAM-MECO