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Summary of Contents for Clarke CDM20
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Page 1: Digital Multimeter
DIGITAL MULTIMETER Model No: CDM20 PartNo: 4500007 0607... - Page 2 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...
- Page 3 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.
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Page 4: Table Of Contents
CONTENTS PAGE SAFETY INFORMATION ....................1 PRELIMINARY ........................ 1 DURING USE ......................... 2 SYMBOLS ........................3 MAINTENANCE ......................4 DESCRIPTION ........................ 5 OPERATING INSTRUCTIONS ..................8 MEASURINGVOLTAGE ....................8 MEASURING CURRENT ....................9 MEASURING RESISTANCE .................... 10 TESTING DIODE ......................11 TESTING TRANSISTOR .................... - Page 5 CONTINUITY TEST ......................12 SPECIFICATIONS ......................13 GENERAL ........................13 DC VOLTAGE ....................... 15 AC VOLTAGE ....................... 16 DC CURRENT ........................ 17 ACCURRENT ......................... 18 RESISTANCE ........................19 DIODE AND AUDIBLE CONTINUITY TEST ..............20 TRANSISTOR liFE TEST ....................20 ACCESSORIES ......................
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Page 6: Preliminary
❉ 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... -
Page 7: During Use
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. -
Page 8: Safety Information
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. -
Page 9: Description
2. DESCRIPTION This meter is a compact, rugged, battery operated, 0.888 handheld 3 ½ digit multimeter, capable of performing the following functions: 1. Power Switch • DC and AC voltage measurement 2. Display • DC and AC current measurement Resistance 3. - Page 10 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 “COM”...
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Page 11: Operating Instructions
OPERATING INSTRUCTIONS 3.1 MEASURING VOLTAGE Connect the black test lead to the COM jack and the red test lead to the V/Q jack. Set the rotary switch at the desired V or V range position and connect test leads across the source or load under measurement. -
Page 12: Measuring Current
3.2 MEASURING CURRENT Connect the black test lead to the COM jack and the red test lead to the A jack for a maximum of 2A current For a maximum of 20A, move the red lead to the 10A jack. Set the rotary switch at desired A or A range position and connect test leads in series with the load under measurement The polarity of the red lead connection will be indicated along with the current value when making... -
Page 13: Measuring Resistance
3.3 MEASURING RESISTANCE Connect the black test lead to the COM jack and the red test lead to the V/Ω jack. (The polarity of red lead is “+” ) Set the rotary switch at desired Q position and connect test leads across the resistor under measurement. -
Page 14: Testing Diode
3.4 TESTING DIODE Connect the black test lead to the COM jack and the red test lead to the V/Ω jack. (The polarity of red lead is “+”. Set the rotary switch at the position and connect red lead to the anode, black lead to the cathode of the diode under testing. -
Page 15: Specifications
4.SPECIFICATIONS Accuracy is specified for a period one year after calibration and at 18º C to 28º C (64º F to 82º F) with relative humidity to 80 %. 4.1 GENERAL Maximum Voltage between ..........CAT II 1000V. Teminal and Earth Ground ..........CAT III 600V. Fuse Protection .............. - Page 16 Polarity indication ..............“-” displayed for negative polarity. Operating Temperature ............0ºC to40ºC (32ºF to l04ºF). Storage Temperature ............10ºC to 50ºC (14ºF to 122ºF). Temp for guaranteed accuracy ........23ºC ± 5ºC. Low Battery Indication ............appears on the display. Size ( W x L x H) ..............
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Page 17: Dc Voltage
4.2 DC VOLTAGE Range Accuracy Resolution 200mV 100µV ± 0.5% of rdg ±1 digits 10mV 200V l00mV 1000V Input Impedance: 10MΩ on all ranges. Overload Protection: 250 V rms AC for 200mV range, 1000 V peak or 700 V rms AC for other ranges CDM-20 Page-16... -
Page 18: Ac Voltage
4.3 AC VOLTAGE Range Accuracy Resolution 200mV ±1.2 % of rdg + 3 digits 100µV 1 mV ±0.8 % of rdg + 3 digits 10mV 200V l00mV 700V ±1.2% of rdg + 3 digits Input Impedance: 10MΩ on all ranges. Frequency Range: 40Hz to 1 kHz;... -
Page 19: Dc Current
4.4 DC CURRENT Range Accuracy Resolution 20µA ± 2.0 % of rdg+ 5 digits 10nA 200µA 0.1µA ±0.8% of rdg + 1 digits 1µA 20mA 10µA 200mA ± 1.2 % of rdg ± 1 digits 100µA ±2.0% of rdg + 5 digits l0mA Max Input Current: 2A:2A. -
Page 20: Accurrent
4.5 AC CURRENT Range Accuracy Resolution 20µA ±3.0% of rdg + 7digits l0nA 200µA 0 .1µA ±1.0% of rdg + 3digits 1µA 20mA 10µA 200mA ± 1.8% of rdg 3 digits 100µA ± 3.0% of rdg + 7 digits l0mA Max Input Current: 2A2A. -
Page 21: Resistance
4.6 RESISTANCE Range Accuracy Resolution 200Ω ±0.5% of rdg + 3 digits 0.1Ω 2KΩ 1Ω 20KΩ ±0.5% of rdg + 1 digit 10Ω 200kΩ 100Ω 2MΩ 1 KΩ 20MΩ ±1.0% of rdg + 2digits 10KΩ Overload Protection: 250V DC/AC rms on all ranges. Open Circuit Voltage: Less than 700mV. -
Page 22: Diode And Audible Continuity Test
4.7 Diode and Audible Continuity Test Range Description Test Condition Display read approximate forward Forward DC current approximately 1mA. voltage of diode Reversed DC voltage approximately 2.8V. Built-in buzzer sounds ifresistance is Open Circuit Voltage approximately 2.8V. less than approximately 30Ω Overload Protection: Sounds alarm (250V AC/DC rms) 4.8 Fransistor hEE Test Range... -
Page 23: Accessories
5. ACCESSORIES Test leads Electric Rating 1500V, 10A MASTECH HYTL — 095 Battery 9V NEDA 1604 or 6F22 Operating Manual HYS004343 6. BATTERY & FUSE REPLACEMENT If the sign appears on the LCD display, it indicates that battery should be replaced. Remove screws on the back cover and open the case.
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