Limit (Limit) - BEHA Unitest Telaris ISO Plus Mode D'emploi

PTDB90690001.qxd:PTDB9069-02.qxd
Measurements
The Timer measurement is started pressing the
"Start" key. During the time that the test volt-
age is present at UUT the symbol of the mea-
surement unit (MΩ/GΩ) is blinking.
The limit value monitoring is permanently car-
ried out during limit value monitoring, i.e. if the
measurement value falls below the limit value.
This condition is indicated by an acoustic sig-
nal and the display of the respective symbol.
The Timer measurement is interrupted when
pressing the "Start" key. A confirmation signal
is audible. The UUT is automatically dis-
charged upon completion of the measure-
ment,. The measurement unit symbol is also
blinking during this procedure.
6.1.2 Acoustic control during Timer
Measurement Timer measurement
If the measurement value changes for the first time
from the overflow (>1.999 GΩ) to a value < 2.000
GΩ, a brief signal sound is audible as confirmation
for having connected a UUT. If the insulation resis-
tance falls below the pre-set limit value, an addi-
tional signal (continuous signal) is audible, where-
by the signal level is clearly different from the first
signal sound. Thus, it is possible to test the insula-
tion of several current circuits. The TELARIS ISO
plus is connected to a protective conductor via a
cable. The second cable will be equipped with a test
probe. Test voltage and Timer duration will be set.
The limit value will be selected. Then, the measure-
ment is started pressing the Start key. The user
hears a brief acoustic sound when connecting the
test probe to a current circuit. During the measure-
ment of the subsequent current circuit, a further
brief signal sound is audible, etc. If the insulation
resistance of a current circuit is too low, the user
hears a continuous sound during the time, the test
probe is measuring the faulty current circuit.
30
02.10.2008 15:36 Uhr
If no brief signal sound is audible during the
measurement of a current circuit, either the
timer duration has already elapsed, or the mea-
surement value amounts to > 1.999 GΩ, or
the measurement instrument has not yet dis-
played the overflow between two measure-
ments.
The last measurement value remains displayed
until a new measurement procedure is started
or a different measurement range is selected.
6.1.3 Limit Value (LIMIT)
Repeated pressing of the "LIMIT" key (16) allows
the setting of 3 limit values for the insulation mea-
surement, or to switch off the limit value monitor-
ing.
The set limit value is displayed. If the measurement
value falls below a pre-set value, a warning signal is
audible and the respective symbol is displayed.
Seite 30