7
CM-450
Using the Features
Selector Switch
Slide switch to desired mode of operation:
AC voltage
DC voltage
AC current
ohms/continuity/diode
Return switch to OFF position when not in use.
Select Button (SELECT)
Momentarily press to select resistance, continuity, or diode test when the
Selector switch is set to
.
Frequency Button (Hz)
Press to measure frequency.
Note: The sensitivity of the frequency measurement function varies with the
measurement range. To automatically select a sensitivity level, measure the
voltage level first, and then press Hz. Pressing Hz before making a measurement
may give higher sensitivity. Reading may be zero when sensitivity is too low.
Electrical noise may cause unstable readings.
Hold Button (HOLD )
Press momentarily to hold the present value on the display. will appear on
the display.
Press again to return to normal mode.
Relative Measurement Button (Δ)
This feature finds the difference between two measurements.
While taking a measurement, press Δ to set the display to zero. Δ will appear
on the display.
Take the second measurement. The value on the display will be the difference
between the two measurements.
Press again to exit this mode.
Auto Power Off
To extend battery life, the meter will shut itself off after approximately 30 minutes
of inactivity. To restore power, press any button.
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