DIGITAL MULTIMETER
Model No: CDM 25
OPERATING INSTRUCTIONS
0507
Thank you for purchasing this CLARKE compact digital multimeter. This instrument is designed to measure AC and DC voltages, AC and DC current, Resistance, Diode, and to perform continuity checks with accuracy and ease.
GUARANTEE This product is guaranteed against faults in manufacture for 12 months from purchase date. Keep your receipt as proof of purchase. This guarantee is invalid if the product has been abused or tampered with in any way, or not used for the purpose for which it is intended. The reason for return must be clearly stated. This guarantee does not affect your statutory rights.
FEATURES Automatic Power OFF.
DC / AC Voltage measurement 1mV to 600V
DC /AC Current measurement 0.01mA to 400mA
Full overload protection
Fully auto-Ranging
Resistance measurement 0.1 to 40 M Data Hold function
Audible continuity function
Diode test at 25A test current
3.75 LCD Display
Auto polarity indication
SPECIFICATIONS Measuring Method: Dual integration mode
Sampling Rate: 2 - 3 times per second
Low Battery Indication: BATT displayed on the left of LCD
Operating Temperature: 0EC - 40EC, less than 80% RH
Dimensions: 70 (W) x 120 (H) x 18 (D) mm
Weight Approx: 110g (Incl batteries)
Battery: 3V, SR44 x 2 or equivalent.
Accessories: Carrying case, Fuse, Operating Instruction booklet
TABLE OF CONTENTS Features ....................................................................... 2 Safety Precautions ..................................................... 4 Description of Front Panel ........................................ 5 Operating Instructions .............................................. 6 DC Voltage ................................................................. 6 AC Voltage ................................................................. 7 DC Current .................................................................. 8 AC Current .................................................................. 8 Resistance Measurement ......................................... 9 Diode ........................................................................... 10 Audible Continuity Test ............................................. 10 Dta Hold Function ...................................................... 10 Maintenance .............................................................. 11 Battery Replacement ................................................ 11 Fuse Replacement ..................................................... 11 Replacement Parts .................................................... 11
When disposing of this product, do not dispose of with general waste. It must be disposed of according to the laws governing Waste Electrical and Electronic equipment, at a recognised disposal facility.
SAFETY PRECAUTIONS Read this information before using the meter, taking special care regarding any WARNING or IMPORTANT notices. The following safe practices and proper operating procedures should be followed when using any multimeter:
WARNING: TO AVOID ELECTRIC SHOCK, USE CAUTION WHEN WORKING ABOVE 40V DC OR 25V AC RMS. SUCH VOLTAGES POSE A SHOCK HAZARD
Inspect the test leads for insulation damage or exposed metal. Damaged leads should be replaced.
Select the proper function and range for your measurement.
Avoid severe shocks and do not drop the multimeter.
Do not allow the meter to be used if it is damaged or if its safety is impaired.
Electrically disconnect the live, or hot, test lead before disconnecting the common test lead.
Follow all equipment safety procedures. Disconnect the input power and discharge all high-voltage capacitors through a protective impedance before testing in and with the multimeter.
Avoid working alone.
When making a current measurement, turn the power off before connecting the multimeter in the circuit. Overloading a current shunt will cause excessive heat.
When measuring transformer secondary or motor winding current, check the multimeter fuses first.
When testing circuits take extra care not to touch any bare metal including the ends of the test probes.
The use of makeshift fuses and the short-circuiting of fuse holders is prohibited.
Whenever it is likely that the protection has been impaired, the meter shall be made inoperative and be secured against any unintended operation.
Never attempt to measure a voltage or current higher than the maximum rating of the meter.
DESCRIPTION OF PANEL
1 - Push Button ON/OFF switch
2 - D - H Push Button for data hold function
3 - Rotary Function Switch
4 - Test Leads. Red - positive, Black - negative polarity
5 - 3 digit LCD from 0 to 9999 counts
3
4
2
1
5
OPERATING INSTRUCTIONS WARNING: Extreme care should be taken when reading high voltages. DO NOT exceed maximum voltage for which the meter is designed.
DC VOLTAGE MEASUREMENT 1. Set function switch to V position
2. Set range switch to desired position. If magnitude of voltage is unknown beforehand, set the switch to its highest range and then reduce until satisfactory reading is obtained.
3. Connect test leads across the source or load under measurement. The polarity of the RED lead connection will be indicated as well as the voltage.
4V 1mV 0.5% of rdg 2 digits
40V 10mV
400V 0.1V 0.8% of rdg 2 digits
600V 1V
Maximum allowable input: 600V DC
Input Impedance: 10M
Accuracy (1 year 18EC 28EC)Range Resolution
AC VOLTAGE MEASUREMENT 1. Set function switch to V position.
2. Set range switch to desired position. Measurement reading can be obtained at 2V and 20V positions, but accuracy is not guaranteed.
3. Connect test leads across load or source under measurement. Read voltage value on display.
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4V 1mV 0.8% of reading 5%
40V 10mV
400V 0.1V 0.5% of full scale 2 digits
600V 1V
Frequency Range: 50 - 400Hz. 50 - 60 Hz for 400/600V ranges.
Max. Allawable Input: 600V rms AC
Accuracy (1 year 18EC 28EC)Range Resolution
DC CURRENT 1. Set function switch to A position
2. Open the circuit to be measured and connect the test leads in series with the load in which current is to be measured.
3. Read current value on display along with polarity of RED test lead.
Accuracy (1 year 18EC 28EC)Range Resolution
40mA 0.01mA
400mA 0.1mA
Overload Protection: 0.5A/250V fuse.
2.0% of rdg 2 digits
AC CURRENT 1. Set function switch to A position
2. Open the circuit to be measured and connect the test leads in series with the load in which current is to be measured.
3. Read current value on display along with polarity of RED test lead.
Accuracy (1 year 18EC 28EC)Range Resolution
40mA 0.01mA
400mA 0.1mA
Overload Protection: 0.5A/250V fuse.
2.0% of rdg 2 digits
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