DIGITAL MULTIMETER INSTRUCTIONS IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY TO ENSURE THE SAFE AND EFFECTIVE USE OF THIS TOOL.

Transcription

1 DIGITAL MULTIMETER STOCK No PART No.DMM10 INSTRUCTIONS IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY TO ENSURE THE SAFE AND EFFECTIVE USE OF THIS TOOL. 05/2001

2 INTRODUCTION Digital Multimeter This multimeter is ideal for general electrical and automotive use. FEATURES 32 position rotary function and range selector. Recessed input terminals for added safety. Measures A.C./D.C. voltage, A.C./D.C. amps, frequency, temperature, resistance and capacitance. 200mA fuse protection. Audible continuity buzzer. Diode test facility. Hi-impact rubber case with integral stands. Supplied with test leads, probes and battery. SPECIFICATION D.C.Voltage: 200mV, 2V, 20V, 200V (accuracy +/- 0.5% of rdg. +/- 1 digit). 1000V (accuracy +/- 0.8% of rdg. +/- 2 digits). A.C.Voltage: 2V, 20V, 200V, (accuracy +/- 0.8% of rdg. +/- 3 digits). 700V, (accuracy +/- 1.2% of rdg. +/- 3 digits). D.C. Amps: 2mA, 20mA, (accuracy +/- 0.8% of rdg. +/- 1 digit). 200mA (accuracy +/- 1.5% of rdg. +/- 1 digit). 10A, (accuracy +/- 2.0% of rdg. +/- 5 digits). A.C. Amps: 20mA (accuracy +/- 1.0% of rdg. +/- 3 digits). 200mA (accuracy +/- 1.8% of rdg. +/- 3 digits). 10A (accuracy +/- 3.0% of rdg. +/- 7 digits). Resistance: 200Ω, (accuracy +/- 0.8% of rdg. +/- 3 digits). 2KΩ, 20KΩ, 200KΩ,2MΩ, (accuracy +/- 0.8% of rdg. +/- 1 digit). 20MΩ, (accuracy +/- 1.0% of rdg. +/- 2 digits). 200MΩ, (accuracy +/- 5.0% of rdg. +/- 10 digits). Frequency: 20KHz (accuracy +/- 1.5% of rdg. +/- 5 digits). Temperature: -20ºC to 0ºC, (accuracy +/- 5.0% of rdg. +/- 4 digits). 0ºC to 400ºC, (accuracy +/- 1.0% of rdg. +/- 3 digits). 400ºC to 1000ºC, (accuracy +/- 2.0% of rdg.) Capacitance: 2nF, 20nf, 200nF, 2µF, 20µF, (accuracy +/- 4.0% of rdg. +/- 3 digits). WARNING: To avoid electric shock remove test leads before opening cover. To prevent risk of fire use only the correct fuse as shown on the rear cover of the meter. (Fuse is bypassed on 20A setting, ensure you refer to point 5 and 6 on page 3). - 1-

3 Fig 1. MAINTENANCE The fuse rarely needs replacing, and almost always, a blown fuse is the result of operator error. (see warning on front page). If the meter battery is in need of replacement, will appear on the display. ACCESSORIES PART No: YDMM10 STOCK No: DESCRIPTION: Multimeter Crocodile clip and Probe Set. PART No: YDMM10 STOCK No: DESCRIPTION: Spare Probe Set

4 KNOW YOUR MULTIMETER - 3-

5 KNOW YOUR MULTIMETER 1. Function and Range Selector Switch This switch is used to select the function and desired range. 2. Display LCD display unit. 3. COM Jack Socket Plug in the black (negative) test lead. 4. V/Ω/Hz (voltage/resistance/hertz) Jack Socket (max 200mA) Plug in the red (positive) test lead for all voltage, resistance and amperage (max 200mA) measurements A Jack socket (max 20A) Plug in the red (positive) test lead for measuring amperage from a minimum of 200mA to a maximum of 20A. 6. Transistor Test Socket Suitable for both NPN and PNP transistors. 7. Temperature Measuring Socket Plug in the thermocouple adaptor provided to measure temperatures between -20ºC to 1000ºC. 8. Capacitor Measuring Socket Insert capacitors directly into testing sockets. Measuring range of 2nF to 2µF. OTHER METER MARKINGS/READINGS Diode or continuity test modes have been selected. Caution (see note 5 above and warning on page 1). Indicates that the meter battery voltage has dropped excessively. Caution, risk of electric shock. µa,ma,a Units for current measurements. ACV AC Voltage ranges. mv,v Units for voltage measurements. DCV DC Voltage ranges. Ω,KΩ,MΩ Units for resistance measurements. DCA DC Current ranges. Indicates low battery. OHM Resistance ranges. - 4-

6 OPERATION WARNINGS: Before you use the instrument, inspect the test leads, connectors and probes for damage e.g. cracks or breaks in the insulation. Replace any defective leads before use. If the voltage to be measured is not known, set the selector switch to the highest range and reduce until a satisfactory reading is obtained. DC Voltage Measurement 2. Set the selector switch to the desired D.C.V. range. 3. Connect the test leads to the circuit to be measured. 4. Turn on the power to the circuit to be measured, the voltage value should appear on the digital display along with the voltage polarity (if reversed only). AC Voltage Measurement 2. Set the selector switch to the desired A.C.V. range. 3. Connect the test leads to the circuit to be measured. 4. Turn on the power to the circuit to be measured. The voltage value will appear on the digital display. AC/DC Current Measurement 1. Connect the red test lead to the ma or A jack socket and the black lead to the COM (For measurements between 200mA and 10A connect the red test lead to the A socket. (Max. 20A). 2. Set the selector switch to the desired A.C./D.C. range. 3. Open the circuit to be measured and connect the test leads IN SERIES with the load in which current is to be measured. (See Fig. 1) on page Turn on the power to the circuit to be measured. The AMPERAGE value should appear on the digital display. Resistance Measurement 2. Set the selector switch to the desired OHM range. 3. WARNING: if the resistance to be measured is part of a circuit, turn off the power and discharge all capacitors before measurement. If the reading is less than 200Ω, the display will show 1MΩ, this figure should be subtracted from measurement results. 4. Connect the test leads to the circuit to be measured. 5. The resistance value should now appear on the digital display

7 Diode Measurement jack socket. 2. Set the selector switch to the position. 3. Connect the red test lead to the anode of the diode to be measured and the black test lead to the cathode. 4. The forward voltage drop in mv will be displayed. If the diode is reversed, the figure 1 should show on the display. Transistor hfe Test 1. Set the selector switch to the hfe position. 2. Determine whether the transistor is NPN or PNP. 3. Locate the emitter (E), base (B) and collect (C) legs into the correct holes in the socket on the front panel. 4. The display will read the approximate hfe value at the test condition of base current 10µA VCE 3.2V. Frequency measurement 2. Set the selector switch to the 20K/Hz position. 3. Connect the test leads to the circuit/source to be measured. 4. The frequency value should now be displayed on the digital display. Note: Readings can be taken from input voltages above 10Vms, but the accuracy is not guaranteed. In noisy environment, it is recommended that shielded cables are used for measuring small signals. Capacitance Measurement 1. Set the selector switch to the desired setting within the F range (20nF to 20µF). 2. Before testing the capacitor in the capacitance measuring socket, be sure that the capacitor has been fully discharged. 3. Once the capacitor has been placed into the testing sockets, the capacitance value will be displayed on the digital display. Continuity Test 2. Set the selector switch to the position. 3. Connect the test leads to the circuit/source to be measured. 4. If continuity exists (i.e. resistance is less than 50Ω) the audible buzzer will sound. Temperature Measurement 1. Set the selector switch to the ºC position. The digital display will show the current environment temperature. 2. Insert the thermocouple plug provided into the temperature measuring socket, but remember to remove it before selecting another function to avoid the risk of an electric shock. 3. Contact the object to be measured with the thermocouple probe. 4. The temperature value will be displayed on the digital display. - 6-

8 DRAPER TOOLS LIMITED, Hursley Road, Chandler's Ford, Eastleigh, Hants. SO53 1YF. U.K. Helpline: (023) Sales Desk: (023) General Enquiries: (023) Fax: (023) YOUR DRAPER STOCKIST Published by Draper Tools Ltd. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical photocopying, recording or otherwise without prior permission in writing from Draper Tools Ltd.