Safety Control Measurements
Before each measurement the instrument automatically checks the measuring
conditions and, while simultaneously displaying the kind of error, prevents
measurements from being started under the following conditions:
excessive voltage on the sockets (> 24 V in RE and R~; > 3 V in
RF)
wrong or incomplete connection
Problems during the measuring sequence (display "E1 ... E5") see
display description in the section 'Procedure of Measurements'.
Battery voltage too low ( display LO-BAT )
Measurement of Interference - Voltages and Frequen-
cies
This measuring function detects possible interference voltages and their fre-
quencies. This function is automatically active in every switch position before
an earthing or resistance measurement. If the pre-set limit values are exceeded,
the interference voltage is indicated as too high and a measurement automati-
cally prevented .The frequency of an interference voltage is only measurable if
the level of this intereference voltage is higher than 1 V. See Figure 7.
Bring central rotary switch in desired position, read out measured value of in-
terference voltage, measured value of interference frequency is displayed with
"DISPLAY".
Earth/Ground Tester
Procedure of Measurements
31