Clas Ohlson cm-100 Manual

Safety Instructions

The meter is constructed and tested according to suit-
able norms. Approved to use according to installation
category II.
The meter is meant for use in dry environment at tempera-
tures from +5° C up to max +40° C. 2000 metres above
sea level.
It is important that you follow all advice and instructions in
this manual. If you do not use the meter in a proper way
the meter's safety functions can be impaired.

International symbols

!
Important information Diode
Alternating current (AC) Contact test
DC Current (DCC) Earth
Double insulation
DATA
General Data
Display: 3 ½ digit LCD display, max value displayed 1999.
Polarity: Minus is displayed automatically (-).
Reset to zero: Automatic.
Value above max limit: Only the digit 1 is displayed.
Power: 1x 9V 6F22 battery.
Size in mm: 70 x 132 x 25.
Weight: approx. 220 grams (with battery and packaging).
Specifications
The accuracy is ± (% of read value + amount of digits
that can differ in the last digit of the measured value) at
+23° C ±5° C and max. 75% relative humidity.
Example: The accuracy at measuring 100 V DC is
±0.8 % ±1 (digit in the last number) = 99.1 V – 100.9 V.
DC Voltage (DCV)
2000 mV, 20 V, 200 V, 500 V: ±0.8 % ±1.
Impedance: 1 MOhm.
Overload protection: 500V AC/DC effective average value.
AC Voltage (ACV)
200 V, 500 V: ±1.5 % ±4.
Impedance: 450 kOhm.
Frequency response: 50 Hz - 200 Hz.
Overload protection: 500V AC/DC effective average value.
GREAT BRITAIN For consumer contact, please visit www.clasohlson.co.uk and click on customer service. Internet: www.clasohlson.co.uk
DC Current (ACA)
200 mA: ±2.0 % ±2.
Overload protection: Quick 200 mA/250 V fuse.
Resistance (Ohms)
2000 Ohm, 20 kOhm, 200 kOhm, 2000 kOhm: ±1.5 % ±3.
Overload protection: 250 V DC/AC (quick).
Diode test
Test current: 1.0 ±0.6 mA
Test Voltage: Max. 3.2 V.
Audible contact test
The buzzer sounds at resistance under ca 100 Ohm.
Battery Test
1.5 V R6 battery:
370 Ohm operating current: 40 mA. If the battery is OK
the multi meter displays.
9 V load:
360 Ohm operating current: 24 mA. If the battery is OK
the multi meter displays.
Front Panel
3 ½ digit
Power OFF
LCD display
Measuring
range for AC
Range switch
voltage (ACV)
Diode/
DC current
contact test
range (DCV)
Measuring range
for resistance
Measuring range
(Ohm)
for battery test
Measuring range for
Housing
DC current (DCA)
Built-in test cables with
probe
Use
Warning!
1. Make sure that the meter's range switch is in DCV or
ACV position when measuring voltage.
If you put the range switch in the wrong position the
multimeter can be destroyed.
2. Take extra caution when measuring voltage higher
than 50 V, especially really high voltage.
3. Always make sure you have selected the correct
function and measuring range. If you are doubtful
about what measuring range to select: start on the
highest range and then decrease a range at a time.
4. Be extra careful when using the meter together with
an electrical transformer that is connected to the test
cables. When the current is disconnected high volt-
age can form on the probes on the test cables.
5. Always check the test cables and probes before
measuring to make sure they are in good condition.
Especially that the insulation has not been damaged.
6. Do not exceed the max data that is indicated in this
manual.
7. When changing the fuse, the new one has to be the
correct size and rating.
Measuring DC Voltage (DCV)
Set the selector switch on desired DCV range and con-
nect the test cables parallelly with the object to be meas-
ured.
Measuring AC Voltage (ACV)
Set the selector switch on desired ACV range and con-
nect the test cables parallelly with the object to be meas-
ured. If you do not know which voltage it is set the selec-
tor on the highest measuring range and then decrease
one step at a time.
Measuring Resistance (Ohm)
Set the selector switch on desired resistance range. If the
measuring resistance part of a circuit you have to make
sure that the circuit is dead before connecting the cable
probes.
Measuring DC Current (DCA)
Set the selector switch to range 200 mA.
Connect the test cables in series with the object to be
measured.
Note! Max input protection: 250 V eff. average value,
within 10 seconds.
Diode test ( )
Set the selector switch toward the symbol for the buzzer
(same position as the diode symbol). Connect the test
cables parallelly with the diode: red probe to the diodes
anode and black to the cathode.
Contact test ( )
Set the selector switch as for the diode test above.
Connect the test cables parallelly with the circuit. If the
resistance is below. 100 Ohm the buzzer will sound.
Battery Test
Set the selector switch at 1.5 V for R6 batteries and at 9
V for batteries of type 6F22.
Care
Before you remove or change battery fuse, loosen test
cables from all current carrying circuits to avoid electric
shocks.
The fuse rarely needs to be changed. If it blows it is usu-
ally the result of incorrect handling.
First, remove the yellow shock absorbing plastic housing
from the back of the meter.
To change battery and fuse you need to remove the
screw on the battery cover on the back of the meter.
Simply remove the used battery/fuse and replace with a
new one of the same size and rating.