Diode Test
1. Insert the black lead into the negative COM jack and the red test lead
into the positive CAP jack
2. Set the function switch to the " CAP" position.
3. Press the SELECT key momentarily to select the diode function
4. Touch the test probe tips to the diode or semiconductor junction you
wish to test. Note the meter reading.
5. Reverse the test lead polarity by reversing the red and black leads.
Note this reading.
6. The diode or junction can be evaluated as follows:
a. If one reading displays a value and the other reading displays "OL",
the diode is good.
b. If both readings display "OL", the device is open.
c. If both readings are very small or 0, the device is shorted.
Temperature Measurements (MM570 only)
1. Insert the T1 Temperature Probe into the COM and TEMP input jacks
observing polarity.
2. Insert the T2 Temperature Probe into the 10A and mA-µA input jacks
observing polarity
3. Set the function switch to the "TEMP" position.
4. Use the SELECT key to toggle between oC and oF.
5. Use the RANGE key to toggle between T1, T2 and T1-T2.
6. Touch the Temperature Probe tip to the device under test.
7. Wait 30 seconds for the measurement to stabilize and then read the
display.
MAX/MIN
Press the MAX/MIN key momentarily to activate MAX/MIN recording
mode. The LCD anunciators “R” and “MAX MIN” turn on. The meter
beeps when a new maximum or minimum reading is updated. Press the
key momentarily to step through the Maximum (MAX), Minimum (MIN),
and Maximum minus Minimum (MAX - MIN) readings. Press the key for
1 second or more to exit MAX/MIN recording mode. Auto Power Off
feature will be disabled automatically in this mode.
17
EXTECH [ EXTECH INSTRUMENTS CORPORATION. ]
