Rel Function; E) Hz Function (Measuring The Electrical Frequency); Hold Function; Display Backlight - VOLTCRAFT VC-740E AC Bedienungsanleitung

d) REL function
The REL function sets a reference value in order to discount test lead interference during resistance measurements.
The displayed reading will be reset to zero when the reference value has been set. Automatic range selection will be
disabled.
Press the "REL" button to activate this mode. The "Δ" symbol will appear on the display.
To disable this feature, press the "REL" button again or change the measuring mode.
This feature is not available in "Motor" and "Hz" modes.

e) Hz function (measuring the electrical frequency)

The AC voltage and current modes feature a sub-mode for measuring the frequency. In order to measure the fre-
quency, the signal level must exceed >30Vrms. You can measure frequencies from 40 to 400 Hz (e.g. mains voltage
frequencies).
To measure the frequency of the current or voltage signal, press the "Hz" button. The display indicates the frequency
in Hz. Press the "Hz" button again to view the current/voltage reading.
f) HOLD function
This feature freezes the current reading on the display so that you can record it for future reference.
When testing live wires, make sure that this feature is disabled before you take any measurements,
otherwise the reading will be incorrect.
This feature is not available in "Motor" mode.
Press the "HOLD" button to enable this feature. The multimeter will beep and "H" will be displayed.
To disable the hold feature, press the "HOLD" button or change the measuring mode.
g) Display backlight
The multimeter automatically switches the backlight on and off according to the ambient brightness. "BL" is displayed
when the automatic backlight feature is enabled. To prevent the backlight from switching on automatically, press the
backlight button ( ). The automatic backlight feature will be automatically re-enabled the next time you turn the
multimeter on.
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