Measuring Insulation - Tmr Mode - HT PV-ISOTEST User Manual

8. The instrument carries out the following measurements in
a sequence:
 Insulation between positive pole (+) of the string and
earth connection
 Insulation between negative pole (-) of the string and
earth connection
 Calculation of the value of resistance Rp given by the
parallel of measurements (+) and (-)
If "Rp≥Lim", the instrument shows the message "OK", to
indicate the positive result of measurement.
Press the SAVE key to store the test result in the
instrument's memory (see § 7.1) or the ESC/MENU key
to exit the screen without saving and go back to the main
measuring screen.
6.2.2. Measuring insulation – TMR mode
1. Position the cursor onto M by using the arrow keys
(,) and confirm with ENTER. The display shows the
screen to the side. By using the arrow keys (,) again,
select the "TMR" measuring mode, in position "MODE".
2. Use the arrow keys  or  and select the position
"Vtest" to set the test voltage.
3. Use the arrow keys (,) to select one of the following
test voltages (Vnom): 250, 500, 1000, 1500VDC.
note that in compliance with IEC/EN62446-1 the test
voltage Vtest must be ≥ rated voltage of the system
4. Use the arrow keys  or  and select the position "Lim.".
The display shows the screen to the side.
5. Use the arrow keys (,) to set the minimum limit
threshold for insulation measurement, which can be
selected among the values 0.05, 0.10, 0.23, 0.25, 0.50,
1.00, 50M. Please note that IEC/EN62446-1
sets 1M as the minimum insulation resistance limit
value for systems with rated voltage higher than 120V
Please
guideline
EN - 20
PV-ISOTEST
M 15/10 – 18:04
( + ) ( - )
V t e s t 1 5 1 0 1 5 1 5
R i n s > 1 0 0 > 1 0 0
R p > 1 0 0
V P N V P E
1 4 8 0 V - 7 5 0 V
OK
DUAL 1500V 1.00M
MODE Vtest. Lim.
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.
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.
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.
V
M 
M 
V N E
7 4 8 V
V
M 
s
- - -
V N E
0 V
3s
Time
V
M 
s
- - -
V N E
0 V
3s
Time
V
M 
s
- - -
V N E
0 V
3s
Time