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Summary of Contents for General DMM30
- Page 1 8-FUNCTION DIGITAL MULTIMETER WITH NCV DETECTION USER’S MANUAL DMM30 Please read this manual carefully and thoroughly before using this product.
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Page 2: Table Of Contents
Operating Instructions ......7 – 11 General Instructions ......7 Holding Readings . -
Page 3: Key Features
PRODUCT OVERVIEW Fig. 1 shows the labels and positions of the controls, LCD and physical structures of the DMM30. Fig. 2 shows all possible indications on the LCD. Familiarize yourself with the functions and meanings of all controls, indications and connectors before moving on to the Setup Instructions and Operating Instructions. -
Page 4: Safety Instructions
1) Low battery indicator 2) Indicates that the displayed value is a held reading 3) Measured value 4) Negative polarity indicator Fig. 2. All possible display indications SAFETY INSTRUCTIONS •• •• Warning To avoid possible electric shock or personal injury, and to avoid damaging the meter or the equipment under test: •... - Page 5 • Use caution when working with voltages above 42VAC , or 60VDC. These voltages pose a shock hazard. • Use the proper terminals, function and range for all measurements. • •WARNING Do not operate the meter around explosive gas, vapor, or dust.
- Page 6 Electrical Symbols Used On the Meter and In This Manual Symbol Description Symbol Description AC (Alternating Fuse Current) Double (Direct Current) Insulated Caution, risk of electric Risk of danger. Important shock. Hazardous information. Refer to the voltage. manual. Low battery indication (when shown Earth ground on LCD)
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Page 7: Setup Instructions
4) Secure the battery compartment by replacing the cover/stand and reinstalling and tightening the Phillips-head screw. OPERATING INSTRUCTIONS GENERAL INSTRUCTIONS All parameters are measured through the included test leads. Unless you are measuring DC currents larger than 200 mA, plug the red test lead into the jack and the black test lead into the COM jack. -
Page 8: Measuring Dc Current
encounter. If you are unsure of the type, select one of the positions. If you are unsure of the amplitude, select either 600 position. (2) Plug the black test lead into the front-panel COM jack and the red test lead into the jack. -
Page 9: Measuring Resistance
If the readout is a negative value, the leads are reversed but the absolute value represents a valid measurement of current amplitude. (7) Remove power from the circuit and discharge all high-voltage capacitors. (8) Remove the test leads and restore the circuit to its original condition by eliminating the break you made in Step 5. -
Page 10: Checking The Integrity Of A Diode
(3) Touch the test leads to any two points of the circuit. The resistance between those two points will be displayed. If the resistance is <40 , the beeper will sound continuously. If there is no continuity (an open circuit or a resistance >40 ) between the two points, OL. -
Page 11: Using The Ncv Detector
(2) Plug the black test lead into the COM jack and the red test lead into jack. (3) Touch the red test lead to the battery’s anode (+ terminal) and the black test lead to its cathode (– terminal). The battery’s voltage will appear on the display. - Page 12 Continuity Open circuit voltage 2.9V Threshold <40 Diode integrity Forward DC current Reverse DC voltage 2.9V Battery voltage Measurement ranges 12V, 9V, 1.5V Measurement accuracy ±(0.8% of reading + 7 digits) in 12V and 9V positions; ±(3% of reading + 5 digits) in 1.5V position Max resolution Safety rating CAT II 600V...
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Page 13: Operating & Maintenance Tips
5. Remove the four Phillips-head screws that secure the two halves of the housing and pull the two halves apart. 6. Locate the blown fuse on the circuit board. The DMM30 uses two different ceramic fuses. The jack is protected by an F250mA/250V fuse. -
Page 14: Warranty Information
The defective unit must be returned to General Tools & Instruments or to a General- authorized service center, freight prepaid and insured. -
Page 15: Return For Repair Policy
Customer Service to obtain an RGA (Return Goods Authorization) number before forwarding the unit via prepaid freight to the attention of our Service Center at this address: General Tools & Instruments 80 White Street New York, NY 10013... - Page 16 FAX (212) 431 - 6499 TOLL FREE (800) 697-8665 e-mail: sales@generaltools.com www.generaltools.com DMM30 User’s Manual Specifications subject to change without notice NOTICE - NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS. ©2015 GENERAL TOOLS & INSTRUMENTS MAN# DMM30 1/28/15 General Tools & Instruments GeneralToolsNYC...