BEHA-AMPROBE BM197 Расширенная инструкция онлайн [6/20] 529186

step through the ranges or functions.

*As Hazardous-Alert: When making resistance measurements in AutoCheck

mode,

an unexpected display of voltage readings alerts you that the object under test is being

energized.

*Ghost-voltage Buster: Ghost-voltages are unwanted stray signals coupled from

adjacent hard signals, which confuse common multimeter voltage measurements. Our

AutoCheck

mode provides low (ramp-up) input impedance (approx. 2.5kΩ at low

voltage) to drain ghost voltages leaving mainly hard signal values on meter readings. It

is an invaluable feature for precise indication of hard signals, such as distinguishing

between hot and open wires (to ground) in electrical installation applications.

WARNING:

AutoCheck

mode input impedance increases abruptly from initial 2.5kΩ to a few

hundred kΩ’s on high voltage hard signals. “LoZ” displays on the LCD to remind the

users of being in such low impedance mode. Peak initial load current, while probing

1000VAC for example, can be up to 566mA (1000V x 1.414 / 2.5kΩ), decreasing

abruptly to approx. 3.37mA (1000V x 1.414 / 420kΩ) 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-switch selector or high input impedance voltage

modes to minimize loading for such circuits.

VFD-ACV

& ACV

functions

Inputs are made through the test leads terminals.

VFD-ACV

function is to deal with VFD (Variable Frequency Device) signals. It,

however, further pre-selects the most appropriate voltage-ranges and thus the Hz

trigger levels to best cope with most VFD-Voltage and VFD-Frequency applications.

Note: The Hz trigger level is determined by the AC/DC+AC Voltage or Current

function-range being in use. Press RANGE button to select

different

function-ranges

and thus

trigger levels manually.

DCV & DC+ACV

(Model 197 only) functions

Inputs are made through the test leads terminals. Defaults at DCV Function. Press

SELECT button momentarily and release to select DC+ACV