Clarke CDM20, Operating Manual

Page 1: ...0607 DIGITAL MULTIMETER Model No CDM20 PartNo 4500007...

Page 2: ...surement 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 ac...

Page 3: ...ase 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 pla...

Page 4: ...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 1...

Page 5: ...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 ACCESS...

Page 6: ...ion 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 comp...

Page 7: ...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...

Page 8: ...rces 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 met...

Page 9: ...t 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 overra...

Page 10: ...ent 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 jack Plug in connector for red...

Page 11: ...he rotary switch at the desired V or V range position and connect test leads across the source or load under measurement The polarity of the red lead connection will be indicates along with the voltag...

Page 12: ...red lead to the 10A jack 2 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 indic...

Page 13: ...easurement NOTE 1 If the resistance being measured exceeds the maximum value of the range selected or the input is not connected an overrange indication 1 will be displayed 2 When checking in circuit...

Page 14: ...at hFE position 2 Determine whether the transistor to be tested is NPN or PNP type and locate the Emitter Base and Collector leads Insert leads of the transistor into proper holes of the transistor te...

Page 15: ...lative humidity to 80 4 1 GENERAL Maximum Voltage between CAT II 1000V Teminal and Earth Ground CAT III 600V Fuse Protection A F 2A1250V 10A unfused Power Supply 9V battery Neda 1604 or 6F22 Display L...

Page 16: ...ve polarity Operating Temperature 0 C to40 C 32 F to l04 F Storage Temperature 10 C to 50 C 14 F to 122 F Temp for guaranteed accuracy 23 C 5 C Low Battery Indication appears on the display Size W x L...

Page 17: ...AGE Range Accuracy Resolution 200mV 100 V 2V 1mV 20V 0 5 of rdg 1 digits 10mV 200V l00mV 1000V lV Input Impedance 10M on all ranges Overload Protection 250 V rms AC for 200mV range 1000 V peak or 700...

Page 18: ...its 100 V 2V 1 mV 20V 0 8 of rdg 3 digits 10mV 200V l00mV 700V 1 2 of rdg 3 digits 1V Input Impedance 10M on all ranges Frequency Range 40Hz to 1 kHz Indication Average rms of sine wave Overload Prote...

Page 19: ...5 digits 10nA 200 A 0 1 A 2mA 0 8 of rdg 1 digits 1 A 20mA 10 A 200mA 1 2 of rdg 1 digits 100 A 2A 1mA 10A 2 0 of rdg 5 digits l0mA Max Input Current 2A 2A 10A 10A continuous 20A 15 sec MAX Overload...

Page 20: ...1 0 of rdg 3digits 1 A 20mA 10 A 200mA 1 8 of rdg 3 digits 100 A 2A 1mA 10A 3 0 of rdg 7 digits l0mA Max Input Current 2A2A 10A10A continuous 20A 15 sec MAX Overload Protection 2A 250V fuse 10A range...

Page 21: ...ISTANCE Range Accuracy Resolution 200 0 5 of rdg 3 digits 0 1 2K 1 20K 0 5 of rdg 1 digit 10 200k 100 2M 1 K 20M 1 0 of rdg 2digits 10K Overload Protection 250V DC AC rms on all ranges Open Circuit Vo...

Page 22: ...eversed DC voltage approximately 2 8V Built in buzzer sounds ifresistance is Open Circuit Voltage approximately 2 8V less than approximately 30 Overload Protection Sounds alarm 250V AC DC rms 4 8 Fran...

Page 23: ...f the sign appears on the LCD display it indicates that battery should be replaced Remove screws on the back cover and open the case Replace the exhausted battery with a new one The fuse should rarely...

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