7
TEMPERATURE MEASUREMENT (for model M838)
1. Put the range switch to the «TEMP» position. The display will show the ambient
temperature.
2. Connect the thermocouple, type «K» to the appropriate sockets on the front panel and
place the thermocouple against the object to be tested. Read the temperature on the
indicator.
3. When the work is nished, put the rotary switch to the «OFF» position.
To avoid electric shock, make sure that the thermocouple is disconnected before
performing other work.
Maximum operating temperature of the thermocouple, type «K» is 250 °C (300 °C
for short-term operating mode).
DIODE TEST
1. Connect the red probe to the socket «VΩmA», and the black probe to the socket
«COM». The polarity of the red probe is considered positive.
2. Put the rotary switch to the position
3. Connect the red probe to the anode and the black probe to the cathode of the tested
diode. The display will show the approximate voltage drop in the diode when the direct
current is owing through it. When the probes are reverse connected to the diode, the
display will show «1».
4. When the work is nished, put the rotary switch to the «OFF» position.
TRANSISTOR TEST
hFE
1. Set the rotary switch to the position
hFE
.
2. Determine whether the transistor is NPN or PNP and identify the emitter, base, and
collector contacts. Insert the transistor into the corresponding holes of the connector on
the front panel: «E» – emitter, «B» – base, «C» – collector of the transistor.
3. Read the hFE value on the display at the base current of 10 µA and collector- emitter
voltage Vce of 2,8 V.
4. When the work is nished, put the rotary switch to the «OFF» position.
Before testing the transistor, remove the probes from the sockets of the multimeter.
!
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