Benning MM 7-2, Operating Manual

Page: 33 / 50

Operation
5.2 Connecting the safety measuring lines
5235 / 05/2022 en BENNING MM 7-2 33
5.2 Connecting the safety measuring lines
For certain tests and measurements, it is necessary to connect the safety measuring lines to the
device.
Requirements
• Please observe the requirements for measuring [
}
page 32].
• Safety measuring lines
The safety measuring lines must be approved for the device (e. g. safety measuring lines
included in the scope of delivery) and be in a technically perfect and operationally safe
condition.
– Check the specifications regarding nominal voltage and nominal current.
– Check the insulation of the safety measuring lines.
– Check the safety measuring lines for continuity.
– Replace defective safety measuring lines.
• Protective caps (depending on the overvoltage category)
• During tests and measurements, only touch the safety measuring lines in the area intended
for your hands.
WARNING
Dangerous voltage
Danger to life or serious injury is possible due to contact with high electric voltage in case of
incorrect operation.
• Do not touch the bare measuring probe tips of the safety measuring lines or the bare
contacts of the optional alligator clips. Only touch the safety measuring lines in the area
intended for your hands.
• Connect the safety measuring lines to the correspondingly marked measuring jacks of the
device and check them for tight fit.
• Only use approved safety measuring lines.
• Attach the protective caps to the contact tips of the safety measuring lines (circuits of
overvoltage category CAT III or IV).
• When disconnecting the measuring circuit, first remove the live safety measuring line
(phase) and then the neutral safety measuring line from the measuring point.
Procedure
1. Connect the black safety measuring line to the COM jack of the device.
2. Connect the red safety measuring line to the following jack of the device depending on the
planned test or measurement:
– Jack for voltage, frequency, duty cycle, resistance or capacitance measurement,
continuity or diode testing
– μA mA: current measurement
– A: current measurement
Please observe the information for visual and acoustic jack control [
}
page 24].
3. Measurements or tests with test probes in electric circuits of overvoltage category CAT III or
CAT IV: Attach the protective caps to the contact tips of the safety measuring lines.