HT PV-ISOTEST User Manual page 22

6. Use the arrow keys  or  and select the position
"Time". The display shows the screen to the side.
7. Use the arrow keys (,) to set the measuring time in
the range: 3s ÷ 999s
8. Connect the instrument to the PV string to be tested as shown in Fig. 7.
also be performed on several strings in parallel with each other. Remember that any
surge arresters connected to the string cables must be disconnected and that it is
advisable to measure upstream of any blocking diodes
Fig. 7: Instrument connection for insulation measurement in TMR mode
Upon pressing the GO/STOP key, different error messages can be displayed
by the instrument (see § 6.2.3) and, therefore, the test cannot be started.
Check and eliminate, if possible, the problem causing the error message
before going on with the test.
9. Press and hold the GO/STOP key for 2s in order to
start the test. In case no error conditions occur, the
instrument displays the message "Measuring..." as
shown in the screen to the side. In field "Vtest (-)", the
real test voltage generated by the instrument is shown.
CAUTION
EN - 21
PV-ISOTEST
M 15/10 – 18:04
V t e s t ( - ) - - -
R i ( - ) - - -
T i m e - - -
D A R - - - P I
V P N V P E
0 V 0 V
TMR 1500V 1.00M
MODE Vtest. Lim.
The test can

M 15/10 – 18:04
V t e s t ( - ) - - -
R i ( - ) - - -
T i m e - - -
D A R - - - P I
V P N V P E
0 V 0 V
Measuring...
TMR 1500V 1.00M
MODE Vtest. Lim.
V
M 
s
- - -
V N E
0 V
3s
Time
V
M 
s
- - -
V N E
0 V
700s
Time