Test Products International 270 - Manual (Page 22)

Measuring DC Microamps
CAUTION!
Do not attempt to make a current measurement with the test
leads connected in parallel with the circuit to be tested. Test
leads must be connected in series with the circuit. Do not
attempt to make a current measurement of circuits with more
than 600V present. Instrument damage and/or personal injury
may result. Make sure the temperature probe is NOT plugged
in during this test.
Instrument set-up:
FUNC. BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
COM V/W /mA 0.01mA
400.0mA
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into the COM input jack.
3. Plug red test lead into the V/ W W/m mA input jack.
4. Set the rotary switch to the m mA function.
5. Connect the test leads in series to the circuit to be
measured.
6. Reconnect power to circuit to be measured.
7. Read the current on the 270.
Optional Modes (See Other Features Section)
• D-H: Freezes the reading on the LCD.
• MAX/MIN: Records minimum and maximum measure-
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Measuring Temperature
CAUTION!
Do not attempt to make a temperature measurement with the
test leads connected to the 270. Remove the test leads and
insert the K-type temperature probe.
Instrument set-up:
FUNC. BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
400ºF N/A N/A -40.0ºF 399.9ºF
1000ºF N/A N/A -40ºF 1000ºF
Measurement Procedure:
1. Remove the test leads from the input jacks.
2. Observing polarity, insert the temperature probe
into the Type K input jack.
3. Set the rotary switch to the appropriate function
for the temperature being measured.
4. Touch the temperature probe to the item to be
measured.
5 . Read the temperature on the LCD.
Note:The 270 will beep when no probe is connected to
the temperature input.
Optional Modes (See Other Features Section)
• D-H: Freezes the reading on the LCD.
• MAX/MIN: Records minimum and maximum measure
ments.
• REL: Enables temperature differential tests to be per
formed. See Application Notes section.
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