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POCKET-SIZED

DIGITAL MULTIMETER

OPERATOR’S
INSTRUCTION MANUAL

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Summary of Contents for M839b

Page 1: ...POCKET SIZED DIGITAL MULTIMETER OPERATOR S INSTRUCTION MANUAL ...

Page 2: ......

Page 3: ...0V above earth groud in category II installations Always be careful when working with voltages above 60V dc or 30V ac rms Keep fingers behind the probe barriers while measuring Before attempting to insert transistors for testing always be sure that test leads have been disconnected from any measurement circuits Components should not be connected to the hFE socket when making voltage measurements w...

Page 4: ...urrent except 10A measurements 5 10A Jack Plug in connection for red positive test lead for 10A measurement SPECIFICATIONS Accuracy is guaranteed for 1 year 23 5 less than 75 relative humidity AC VOLTAGE Range Resolution Accuracy 200V 100mV 1 2 of rdg 10 digits 600V 1V 1 2 of rdg 10 digits Overload protection 600V dc or rms ac for all ranges Frequency range 45Hz to 450Hz Response Average respondin...

Page 5: ...rload protection 250V rms ac on all ranges DIODE TEST Range Description Show the approx forward voltage drop of the diode Overload protection 250V rms ac GENERAL Maximum voltage between terminals and earth ground CAT II 600V Fuse protection F 250mA 250V 10A range unfuse Power supply 1 9V 6F22 or NEDA 1604 Display LCD 1999 counts updates 2 3 sec Measuring method Dual slope integration A D converter...

Page 6: ...larity of the red lead connection DC CURRENT MEASUREMENT 1 Connect the red test lead to the VΩmA jack and the black lead to COM jack For measuring current between 200mA and 10A remove red lead to 10A jack 2 Set the rotary switch at desired A position 3 Open the circuit in which the current is to be measured and connect test leads in series with the circuit 4 Read current value on the LCD display a...

Page 7: ... the anode of the diode to be tested and the black lead to the cathode of the diode 4 The approx forward voltage drop of the diode will be display in mV If the connection is reversed only figure 1 will be shown BATTERY FUSE REPLACEMENT If the sign BAT appears on the LCD display it indicates that the battery should be replaced Loosen screws on the back cover and open the case Replace the exhausted ...

Page 8: ...ppliance in an environment with a strong radiated radio frequency electromagnetic field approximately 3V m may influence its measuring accuracy The measuring result can be strongly deviating from the actual value HYS004369 ...

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