Operation - Extech Instruments MultiMaster MM560A User Manual

cause digit rolling or offset in voltage measurements. This series has a CMRR specifications of > 80dB
at DC to 60Hz in ACV function; and > 120dB at DC, 50 and 60Hz in DCV function. If neither NMRR nor
CMRR specification is specified, a DMM's performance will be uncertain.
Analog bar-graph
The analog bar graph provides a visual indication of measurement like a traditional analog meter
needle. It is excellent in detecting faulty contacts, identifying potentiometer clicks, and indicating signal
spikes during adjustments. Analog bar-graph is not available in AC+DC True RMS Voltage & Current
modes.
4)

OPERATION

CAUTION
Before and after hazardous voltage measurements, test the voltage function on a known source such
as line voltage to determine proper meter functioning.
AC Voltage, DC Voltage, DC+AC Voltage, &
In AC Voltage, press SELECT button momentarily to toggle between AC and dBm. In DC Voltage,
press SELECT button momentarily to toggle between DC, and DC+AC. In mV Voltage, press SELECT
button momentarily to select DC, AC, or DC+AC. The new settings will be saved automatically to the
non-volatile memory as power up default. In DCV and DCmV, press 500000 button momentarily to
toggle between 4-4/5 digits and 5-4/5 digits readings. In voltage or current functions, press the
Hz push button momentarily to activate or to exit Line Level Frequency measuring function. Line
Level Frequency measuring function is designed especially for noisy electrical high voltage signals.
Note: In dBm function, power up default reference impedance will be displayed for 1 second before
displaying the dBm readings. Press dBm- (RANGE) button momentary to select different reference
impedance of 4, 8, 16, 32, 50, 75, 93, 110, 125, 135, 150, 200, 250, 300, 500, 600, 800, 900, 1000, up
to 1200. The new impedance value will be saved automatically to the non-volatile memory as power
up default.
dBm
A
V1.1 8/12
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Hz Line Level Frequency
dBm-Ω
A
6
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dBm
A
MM560A-MM570A-EU-EN