Test Products International 270 - Manual (Page 33)

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Application Notes (Temperature Differential)
When measuring temperature there may be applica-
tions when knowing the differential between two mea-
surements is required. This can be accompished by
following these steps.
•
Remove the test leads from the input jacks. Insert
the K-type thermocouple probe into the input jack
on the 270. Set the 270 to the desired TEMP
function.
• Touch the temperature probe sensor to the device
under test (T1).
• When the reading stabilizes, press the REL but-
ton. The display will read “0” and T1 will be
stored as the reference value that the next mea-
surement will be made relative to.
• Touch the temperature probe sensor to the device
under test (T2).
• The 270 will display the differential temperature
T2-T1.
Application Notes (AC Amps)
When measuring AC Amps of a motor there
are two types of measurements that can be
made, running current and in-rush or start-up
current. Start-up current will usually be much
higher than running current.
Set up the meter following the steps under
“Measurement Procedure” on page 17, and
then proceed with the following:
• Clamp the meter around a single wire
and reconnect power to the device. Read
the current displayed on the meter. This
is the running current of the motor.
• Disconnect power to the motor and put
the meter in PEAK HOLD mode.
Reconnect the power and read
the current displayed on the
meter. This is the in-rush or
start-up current
of the motor.