HT instruments SIRIUS87 - Manual (Page 20)

SIRIUS 87
EN - 18
4.2.1.2. Mode "TIMER"
6. Use the following keys to set the duration time of the test:
Press this key to increase the duration time of the test ( Tmax=999 seconds).
Press this key to decrease the duration time of the test ( Tmin=10 seconds).
7. Press
the
START/STOP key.
The instrument effects the measurement ending when the set time has elapsed.
999 seconds
 Maximum value of the test duration.
10 seconds  Minimum value of the test duration.
Note: Pressing the START/STOP key again the test gets immediately interrupted.
 At the end of the test, in case the
resistance value R
ISO
detected results
to be lower than R
MAX
(depending on
the selected voltage see following table)
and the test is effected at the selected
rated voltage value, the instrument
emits a
double sound signal indicating
the positive outcome of the test
displays one screen similar to the screen
alongside.
R
ISO

2.07
M 
500 V 20
s
TIMER
The values of measured resistance of isolation always must be confronted with the
normative limits for being able to assert if the system is to norm.
SAVING: The test can be stored pressing the SAVE key twice
(according to § 5.1).
Note: The maximum resistance value R
MAX
which can be measured in mode M

depends on the rated voltage selected for the test. In particular:
Rated voltage selected
for the test
R
MAX
= Maximum resistance
value
50VDC 99.9M

100VDC 199.9M

250VDC 499M

500VDC 999M

1000VDC 1999M

Table 2: Test maximum resistance values depending on the rated voltage selected
Timer mode.
Duration of the
set test.
Insulation
resistance value
R
ISO.
Rated voltage value selected for the Timer test.
SAVE
START
STOP
S▲
U
L
▼