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in such low impedance mode. Peak initial load current, while probing 1000VAC for

example, can be up to 471mA (1000V x 1.414 / 3kΩ), decreasing abruptly to approx. 3.1mA

(1000V x 1.414 / 460kΩ) within a fraction of a second. Do not use AutoCheck

mode on

circuits that could be damaged by such low input impedance. Instead, use rotary selector

or high input impedance voltage modes to minimize loading for such circuits.

dBm

+Hz

(TBM829 only), 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. 1V 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.

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.

DC+ACV

+ACV

(TBM525 & TBM829 only), DCV, DCV

+ACV

functions

Press the SELECT button momentarily to select the subject functions in sequence. Last

Brymen TBM811 User Manual

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