Amprobe AM91RS Digital-Multimeter - Manual (Page 7)

6
4) OPERATION
ACV, ACV + Hz, & dBm + Hz functions
Defaults at ACV. Press SELECT button momentarily to select ACV + Hz. Press
SELECT button momentarily again to select dBm + Hz. Input sensitivity for Hz varies
automatically with voltage range selected in ACV + Hz function. It is designed especially
for measuring the frequency of high voltage noisy electrical signals.
Note: Default Reference impedance 600 Ω will be displayed for 2 seconds before
displaying the dBm + Hz readings. Press dBm- Ω Ω (RANGE) button momentary to select
different reference impedance from 4, 8, 16, 32, 50, 75, 93, 110, 125, 135, 150, 200, 250,
300, 500, 600, 800, 900, 1000, up to 1200
Ω . Impedance values will again be displayed for
2 seconds before displaying the dBm + Hz readings.