Instruction Manual

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.