Operating instructions

ManualsBrandsClarke ManualsMultimeterCDM20

0607

DIGITAL MULTIMETER

Model No: CDM20

PartNo: 4500007

Summary of content (24 pages)

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DIGITAL MULTIMETER Model No: CDM20 PartNo: 4500007 0607
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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.
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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 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.
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CONTENTS PAGE 1. SAFETY INFORMATION ................................................................................................. 1 1.1 PRELIMINARY ................................................................................................................ 1 1.2 DURING USE ................................................................................................................. 2 1.3 SYMBOLS .............................................................................................
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3.6 CONTINUITY TEST .......................................................................................................... 12 4. SPECIFICATIONS ........................................................................................................... 13 4.1 GENERAL ...................................................................................................................... 13 4.2 DC VOLTAGE .................................................................................................
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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.
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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.
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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).
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2. DESCRIPTION This meter is a compact, rugged, battery operated, handheld 3 ½ digit multimeter, capable of performing the following functions: 0.888 1. Power Switch • DC and AC voltage measurement 2. Display • DC and AC current measurement Resistance measurement 3. Transistor Testing Socket • Diode measurement 4. Rotary Switch • Audible continuity test 5.
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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.
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3. OPERATING INSTRUCTIONS 3.1 MEASURING VOLTAGE 1. 2. 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. The polarity of the red lead connection will be indicates along with the voltage value when making DC voltage measurement. 3.
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3.2 MEASURING CURRENT 1. 2. 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 DC current measurement. 3.
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3.3 MEASURING RESISTANCE 1. 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 “+” ) 2. Set the rotary switch at desired Q position and connect test leads across the resistor under measurement. 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.
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3.4 TESTING DIODE 1. 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 “+”. 2. Set the rotary switch at the position and connect red lead to the anode, black lead to the cathode of the diode under testing. The meter will show the approx. forward voltage of the diode. If the lead connection is reversed, only figure “1” displayed. 3.5 TESTING TRANSISTOR 1. Set the rotary switch at hFE position. 2.
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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 ..................................................................... A: F 2A1250V; 10A: unfused. Power Supply ..............................................
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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 .........................................................
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4.2 DC VOLTAGE Range Accuracy Resolution 200mV 100µV 2V 1mV 20V ± 0.5% of rdg ±1 digits 10mV 200V l00mV 1000V lV Input Impedance: 10MΩ on all ranges.
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4.3 AC VOLTAGE Range Accuracy 200mV ±1.2 % of rdg + 3 digits 100µV ±0.8 % of rdg + 3 digits 10mV ±1.2% of rdg + 3 digits 1V 2V 20V 1 mV 200V 700V Resolution l00mV Input Impedance: 10MΩ on all ranges. Frequency Range: 40Hz to 1 kHz; Indication: Average (rms of sine wave). Overload Protection: 250V rms AC for 200mV range and 1000V DC or 700V rms AC for other ranges.
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4.4 DC CURRENT Range 20µA Accuracy Resolution ± 2.0 % of rdg+ 5 digits 10nA ±0.8% of rdg + 1 digits 1µA ± 1.2 % of rdg ± 1 digits 100µA ±2.0% of rdg + 5 digits l0mA 200µA 2mA 0.1µA 20mA 200mA 10µA 2A 10A 1mA Max Input Current: 2A:2A. 10A:10A continuous, 20A 15 sec.MAX.
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4.5 AC CURRENT Range 20µA Accuracy l0nA ±1.0% of rdg + 3digits 1µA ± 1.8% of rdg 3 digits 100µA ± 3.0% of rdg + 7 digits l0mA 200µA 2mA 0 .1µA 20mA 200mA 10µA 2A 10A Resolution ±3.0% of rdg + 7digits 1mA Max Input Current: 2A2A. 10A10A continuous, .
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4.6 RESISTANCE Range 200Ω Accuracy Resolution ±0.5% of rdg + 3 digits 0.1Ω ±0.5% of rdg + 1 digit 10Ω 2KΩ 20KΩ 1Ω 200kΩ 100Ω 2MΩ 20MΩ 1 KΩ ±1.0% of rdg + 2digits Overload Protection: 250V DC/AC rms on all ranges. Open Circuit Voltage: Less than 700mV.
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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.
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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. Replace the exhausted battery with a new one. The fuse should rarely need replacement and will blow almost always as a result of operator error.
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