Benning MM 7-2, Operating Manual

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4.2 Functions
Device description
5235 / 05/2022 en BENNING MM 7-2 24
4.2.8 “RANGE” key
“Measuring range” function
Press the “RANGE” key to disable the automatic measuring range selection (AUTO) and set the
measuring range manually. Press the “RANGE” key (>1 second) to enable the automatic
measuring range selection afterwards (the “AUTO” symbol will be displayed).
The manual measuring range selection is not available for the following functions:
• AutoV LoZ
• Capacitance measurement
• Frequency measurement
4.2.9 “AutoV LoZ” function
“AutoV” function
The corresponding measuring function (AC or DC voltage) and the optimum measuring range
are set automatically. Without a measuring signal, the “Auto” symbol is displayed. The coupling
mode (AC or DC) is set automatically from 1 to 1 000 V, depending on which peak value
(AC or DC) is higher. Other available functions are “HOLD” [
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and “Voltage indicator” [
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page 22].
“LoZ” function
The input resistance briefly is only approx. 2.1 kΩ in order to suppress unwanted inductive and
capacitive voltages (reactive voltages) and increases within fractions of a second to several
hundred kΩ in case of high-energy voltages.
4.2.10 Jack control
The device is provided with a visual and acoustic jack control. If a rotary switch position is set
that is not admissible for the “A” or “μA / mA” jacks (e. g. voltage measurement) and a safety
measuring line is plugged into this socket, an acoustic signal will be emitted and the
“InEr” (‘Input error’) will be shown on the digital display to protect the device.
A non-functioning visual and acoustic jack control indicates a defective fuse.