Test Products International 270 User Manual
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F. Application Notes (AC Volts)
Disconnect power from the
terminal block, find the fuse
or circuit breaker that con-
trols the block and turn it
off.
Set up the meter following
the steps under
“Measurement Procedure”
on page 15. Then proceed with
the following:
•Connect the red test lead to
the hot side of the block and
the black lead to the neutral
side of the block. Reconnect
power to the block and read
the voltage on the meter. The
reading should be approximately 110V to
130V.
•
Disconnect power from the block and move
the red wire to ground. Reconnect power to
the block and read the voltage on the meter.
Typically less than 20V should exist from
neutral to ground. If 110V or above exists,
the block may be wired incorrectly.
Other Features (continued)
Manual Ranging (R-H)
The range hold button (R-H) activates manual ranging.
Press the R-H button to cycle through available ranges.
Pressing and holding the R-H button for approximately two
seconds returns the meter to autorange mode and “auto” will
be displayed in the upper left corner of the display.
Data Hold (D-H)
Press the D-H button at any time to freeze the reading on the
LCD display. This function is useful when measuring in
locations where the display is difficult to read.
LED Indicators
The 270 is equipped with three LED indicators at the top near
the jaw.
HI-V
This indicator flashes and the 270 beeps
when the test leads are in contact with a
voltage of 30V AC/DC or more.
NCV
This indicator illuminates when the non-
contact voltage detector senses a voltage.
This is the visual indicator of continuity. This
LED also flashes anytime the buzzer beeps.