Clarke CDM20 Manual de usuario
0607
DIGITAL MULTIMETER
Model No: CDM20
PartNo: 4500007
WARNING
Before attempting to open the case, Always be sure that test leads have been disconnected from
measurement circuits. Close case and tighten screws completely before using the meter to avoid
electrical shock hazard.
DO NOT dispose of this product with general household waste. It must be disposed of according to all laws
governing waste electrical and electronic products at a recognised disposal facility
Thank you for purchasing this CLARKE Digital Multimeter.
Please read this leaflet thoroughly and follow the instructions carefully, in doing so you can look forward to
the multimeter giving you long and satisfactory service.
Guarantee
This CLARKE product is guaranteed against faulty manufacture for a period of 12 months from the date of
purchase. Please keep your receipt as proof of purchase.
This guarantee is invalid if the product is found to have keen abused or tampered with in any way, or not
used for the purpose for which it was intended.
Faulty goods should he returned to their place of purchase. No product can he returned to us without prior
permission. This guarantee does not effect sour statutory rights.
WARNING
Before attempting to open the case, ALWAYS ensure that the test leads have been
disconnected from their measurement circuits. Close the case and tighten the screws
completely before using the meter to avoid the possibility of electric shock
CDM-20 Page-2
CONTENTS PAGE
1. SAFETY INFORMATION ................................................................................................. 1
1.1 PRELIMINARY ................................................................................................................ 1
1.2 DURING USE ................................................................................................................. 2
1.3 SYMBOLS ....................................................................................................................... 3
1.4 MAINTENANCE ............................................................................................................ 4
2. DESCRIPTION ................................................................................................................ 5
3. OPERATING INSTRUCTIONS ......................................................................................... 8
3.1 MEASURINGVOLTAGE ................................................................................................. 8
3.2 MEASURING CURRENT ................................................................................................ 9
3.3 MEASURING RESISTANCE ............................................................................................ 10
3.4 TESTING DIODE ............................................................................................................. 11
3.5 TESTING TRANSISTOR ................................................................................................... 11
CDM-20 Page-3
CDM-20 Page-4
3.6 CONTINUITY TEST .......................................................................................................... 12
4. SPECIFICATIONS ........................................................................................................... 13
4.1 GENERAL ......................................................................................................................13
4.2 DC VOLTAGE ............................................................................................................... 15
4.3 AC VOLTAGE ............................................................................................................... 16
4.4 DC CURRENT ................................................................................................................ 17
4.5 ACCURRENT ................................................................................................................. 18
4.6 RESISTANCE .................................................................................................................. 19
4.7 DIODE AND AUDIBLE CONTINUITY TEST ..................................................................... 20
4.8 TRANSISTOR liFE TEST .................................................................................................... 20
5. ACCESSORIES .............................................................................................................. 21
6. BATTERY & FUSE REPLACEMENT .................................................................................. 21
1. SAFETY PRECAUTIONS
This multimeter has been designed according to lEG-lOb concerning electronic measuring instruments with
an overvoltage category (CAT II) and pollution 2.
Follow all safety and operating instructions to ensure that the meter is used safely and is kept in good
operating condition.
1.1 PRELIMINARY
❉When using this meter, the user must observe all normal safety rules concerning:
• Protection against the dangers of electronic current.
• Protection of the meter against misuse.
❉Full compliance with safety standards can be guaranteed only if used with the test leads supplied. If
necessary, they must be replaced with the same model or same electronic ratings. Measuring leads
must be in good condition. Replacements are available from CLARKE International - see back page.
CDM-20 Page-5
1.2 DURING USE
❉Never exceed the protection limit values indicated in specifications for each range of measurement.
❉When the meter is linked to measurement circuit, do not touch unused terminals.
❉When the value scale to be measured is unknown before hand, set the range selector at the highest
position.
❉Before rotating the range selector to change functions, disconnect test leads from the circuit under
test.
❉Never perform resistance measurements on live circuits.
❉Always be careful when working with voltage above 60V dc or 30V AC rms. Keep fingers behind the
probe barriers while measuring.
❉Before attempting to insert transistors for testing, always be sure that test leads have been
disconnected from any measurement circuits.
❉Components should not be connected to the hFE socket when making voltage measurements with
test leads.
CDM-20 Page-6
1.3 SYMBOLS
Important safety information, refer to the operating manual.
Dangerous voltage may be present.
Earth ground.
Double insulation ( Protection class II).
A Fuse must be replaced with ratings specified in the manual.
1.4 MAINTENANCE
❉Before opening the meter, always disconnect test leads from all sources of electric current.
❉For continue protection against fire, replace fuse only with the specified voltage and current rating:
F 2A1250V (quick acting).
❉If any faults or abnormalities are observed, the meter cannot be used. It must be inspected and
❉repaired by a qualified technician, or returned to CLARKE International for repair.
❉Never use the meter unless the back cover is in place and fastened fully.
❉Do not use abrasives or solvents on the meter, use a damp cloth and mild detergent only. CDM-20 Page-7
2. DESCRIPTION
This meter is a compact, rugged, battery operated,
handheld 3 ½ digit multimeter, capable of
performing the following functions:
• DC and AC voltage measurement
• DC and AC current measurement Resistance
measurement
• Diode measurement
• Audible continuity test
• Transistor hEE measurement
The Dual-slope A/D Convert uses CMOS technology
for auto-Zeroing, polarity selection and overrange
indication. Full overload protection and low battery
indication are provided
CDM-20 Page-8
1. Power Switch
2. Display
3. Transistor Testing
Socket
4. Rotary Switch
5. Input Jacks
0.888
CDM-20 Page-9
2.1 POWER SWITCH
A push - push switch is used to turn the meter on or off.
2.2 DISPLAY
3 ½ digit, 7 segment, 18mm high LCD.
2.3 FUNCTION AND RANGE SELECTOR
There are different functions and 32 ranges provided. A rotary switch is used to select functions and ranges.
2.4 INPUT JACKS
1. “COM” jack - Plug in connector for black (negative) test lead
2. “V/Ω” jack - Plug in connector for red (positive) test lead for voltage and resistance.
3. “2A” jack - Plug in connector for red test lead for current (2A MAX).
4. “10A” jack - Plug in connector for red test lead for 10A measurement.
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