1. TECHNICAL DATA
Product: Ferm Digital Multimeter
Type MM-940 Art. no. 185940
Ferm b.v. Genemuiden, Netherlands
3 1/2 Digit Liquid Crystal Display (max. readout: 1999)
Operation temperature: 0 .... 40°C (rel. humidity <75%)
Readout frequency: 2-3 seconds
Max. "Common mode" voltage: 500VDC or AC rms.
Storing temperature: -10 .... +50°C
The multimeter operates on a 9V battery of type
6LR62 or MN 1604.
"Battery LOW" indication: ' ' is lit.
Calibration: Accuracy will be guaranteed for a period of
1 year, at 23°C +/-5°C and a relative humidity of <75%.
READ THIS USER'S MANUAL CAREFULLY!
2. USAGE
Your multimeter can be used to perform measure-
ments of direct voltage (VDC), direct current (ADC),
alternating voltage (VAC), alternating current (AAC)
resistance (Ω, Ohm) and diodes- and continuity test
and battery check.
3. KNOW YOUR PRODUCT
Read this user's manual carefully and pay attention to
the safety rules in particular, before you put your mul-
timeter into use. Maintain your multimeter according
to the instructions, to keep it in good shape. Do not
use your multimeter, until you really understand the
operation procedures. Keep this manual in a safe
place, together with the other documentation of your
device.
4. GENERAL SAFETY RULES
Your device has been developed with the greatest
care for safety. Any modification or extension of the
design can undo the safety.The guarantee can also be
cancelled for that reason.
Keep your working area neat and tidy:
- An untidy working environment can cause acci-
dents
- Provide sufficient lighting in your working environ-
ment
Be aware of the impact of your working area
Never use your multimeter in a moist or wet area.
Never leave it in the rain.
Keep children away
Never let other persons use your multimeter.
Keep them out of the working area.
Store your tools in a safe place
Keep your multimeter in a dry place, if you do not
use it.
Never overload your multimeter
You will work better and safer within the indicated
power range. The guarantee will not cover damage
due to overload.
Never use the measuring cord in the wrong way
Never carry your device, holding it with the
measuring cord. Do not pull the cord to remove
the plug from your multimeter. Always pull the
plug itself.
Maintain your multimeter carefully
Keep your multimeter clean, for better and safer
performances. Keep it dry and far from oil and grease.
Remove the measuring plug from your multi-
meter
If you do not use your multimeter.
Check your tools for damage
- Try the safety facilities or damaged parts carefully
on their excellent and purposive performance,
every time before you use your device.
- Check if all conditions have been met, which may
influence the performance of your device.
5. SPECIAL SAFETY RULES
1. WARNING! Measuring high voltages or cur-
rents can endanger your life. Never touch the bare
parts of the measuring cords, when you measure
voltages higher than 40 Volt or currents over 20
mA.
2. Your multimeter is a measuring instrument. Never
hit or drop it.
3. Turn the switch to the OFF-position to save the
battery, when you do not use your multimeter.
4. Keep your device far from high humidity or high
temperatures.
5. Keep your multimeter far from strong magnetic
fields.
6. Remove the battery to prevent leakage, when you
intend to put your multimeter out of use for a long
time.
7. Remove the cords immediately, when you smell
