Brymen BM869s - Operation - dBm and AC Measurements; dBm, Hz, and ACV Functionality

6
Drive measurements. You can also press the RANGE button momentarily to select
another trigger level (voltage range) manually. If the Hz reading becomes unstable,
select higher voltage range to avoid electrical noise. If the reading shows zero, select
lower voltage range for better sensitivity.
dBm
+Hz
, Hz
+ACV
, ACV
+Hz
functions
Press the SELECT button momentarily to select the subject functions in sequence.
Last selection will be saved as power up default for repeat measurement convenience.
Note: Hz Input sensitivity varies automatically with voltage (current function alike)
range selected. 5V range has the highest and the 1000V range has the lowest. Auto-
ranging measurements normally set the most appropriate trigger level. You can also
press the RANGE button momentarily to select another trigger level (voltage range)
manually. If the Hz reading becomes unstable, select higher voltage range to avoid
electrical noise. If the reading shows zero, select lower voltage range for better
sensitivity.
Note: In dBm
+Hz
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. Last selection
will be saved as power up default for repeat measurement convenience. Manual trigger
level selection on Hz reading is not available in this function.