Instruction Manual

When measuring resistance of a motor, make

sure the power is disconnected prior to testing.

Set up meter following steps under

“Measurement Procedure” on page 16, and

proceed with the following:

• Connect the red test lead to one power

input line of the motor and the black test

lead to the other power input line of the

motor. In most applications if the reading

is OFL, the motor winding is open.

• Connect the red test lead to the frame of

the motor and the black test lead to the

winding. In most applications if a reading

of 0 Ohms is displayed, the winding is

shorted to the motor frame (ground).

Application Notes (DC Volts)

The 270 will accurately measure rectified DC Voltages like

those encountered in furnaces and other appliances even

though many of these devices do not have output filtering

or other signal conditioning.

When measuring DC Voltage of a bat-

tery, the most accurate reading can be

attained by testing the battery under

load. To accomplish this, follow steps

1 through 4 shown on page 14 and

the following (with the battery in

holder and device turned on):

• Connect the red test lead from the

meter to the positive (+) terminal

of the battery.

• Connect the black test lead to the

negative (-) terminal of the battery.

Application Notes (Resistance)