Operation Manual

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BENNING ST 750 A
Pressthe<▼>buttontoopenthe"calendarview"toselectthemonthandtheyeardirectly.Select
themonthfromthelistandchoosethecorrespondingyearbymeansofthearrowbuttons(<◄>,
<►>).Tosetthetime,select"HH":"MM":"SS"respectivelyandsetthevaluebymeansofthe
arrowbuttons(<◄>,<►>).
7.7 Calibration / System Calibration
Probe calibration (compensation of the test cable): Depending on the test cable used, the probe
should be calibrated again. This calibration is necessary, because the resistance of the test ca-
ble will be taken into consideration for the measuring result of the protective conductor resistance
measurement! The calibration data will be saved permanently in the device.
Gotothe"Setup Selection"menuandpress<Calibration>.
Connecttheconnectingcable(testcable)totheyellow"Sonde/Probe"jackandtothegreen"Kal./
Cal."jack.Press<Probe Calibration>andconrmthemessagewith<Yes>. Now, probe calibra-
tion has been done successfully.
A ZERO balance / calibration is necessary, if in standstill or with a missing signal the displayed
measured values are not approximately at 0 (e.g. 0.000 mA). For this, go to the start menu and
press <Setup>, <Calibration>. Then, press <ZERO Balance> and start it by pressing <Yes>.
During calibration, no connecting cables of the test sample or other cables must be connected to
the device!
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The device shall be calibrated at the manufacturer's in certain time intervals (see chap-
ter23"Maintenance/Calibration").