Benning CM 2-1, Operating Manual

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5.4 Current or frequency measurement
Operation
5191 / 07/2021 en BENNING CM 2-1 30
5.4 Current or frequency measurement
Requirements
• Please observe the requirements for measuring [ } page 26].
• Make sure that no voltage is applied to the jacks of the device (“COM” and “+”). Remove
any connected safety measuring lines.
• Current ranges [
}
page 24] and frequency ranges [
}
page 25]
Figure 12: Current or frequency measurement
Procedure
1. Set the rotary switch of the device to switch position “Hz ”.
2. Press the “AC HFR / DCA ZERO” key to set the desired measuring function (frequency, AC
or DC).
3. For DC measurements: Press and hold the “AC HFR / DCA ZERO” key for approx. 2 s to
switch the device into the initial mode by means of a null balance. The “Δ” symbol is shown
on the digital display.
4. Operate the opening lever and clamp the single-wire live conductor centrally with the
measuring clamp.
5. Read the measured value on the digital display.