Test Products International 265 - Manual (Page 27)

27 26
G. Trouble Shooting
Problem Probable Causes
Does not power up • Dead or defective battery
• Broken wire from battery
snap to PCB
All functions except • Very weak battery that will
ohms read high not turn on the low battery
indicator on the LCD
AC Volts do not read • Very weak battery that will
not turn on the low battery
indicator on the LCD
AC Amps does not read • Make sure the jaw is clamped
around a single wire and the
device connected to the wire is
turned on.
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.