HT instruments SOLAR I-V - Manual (Page 51)

I-V400 - SOLAR I-V
EN - 49
15. After connection to the panel, the real time values are
shown by meter:
 Open voltage of module installation
 Irradiance value on the panel installation, measured by
reference cell
15/05/10 15:34:26
R s
V d c
I r r
= - - -

= 3 6 7 V
= 1 0 4 5 W / m 2
Module: SUNPOWER 210
Select RS Mode
CAUTION
After pressing the GO/STOP key, some different messages can be shown by
the meter (§ 6.3) and, in this case, the meter does not perform the test.
Check and, if possible, solve this situation before carrying on with the test.
16. Press GO/STOP key to start the test. If none of the
previous error messages are detected, the message
“Measuring 1 running…” is displayed for about 5 s and
the meter performs the first measurement of Rs with the
standard conditions of module irradiance (§ 5.1.5).
15/05/10 15:34:26
R s
V d c
I r r
= - - -

= 3 6 7 V
= 1 0 4 5 W / m 2
Module: SUNPOWER 210
Measure 1 running…
Select RS Mode
17. After performing the first measurement, the meter enters a
waiting mode before starting the second measurement,
which should be performed with the panel partially
obscured and the message “Wait for modifying Irrad.”
18. Cover the module under test and the reference cell (e.g.
by using a white plexiglass sheet) in order to reduce the
irradiance value measured by a percentage ranging from
40% up to 70% with respect to the previous test.
15/05/10 15:34:26
R s
V d c
I r r
= - - -

= 3 6 7 V
= 1 0 4 5 W / m 2
Module: SUNPOWER 210
Wait for modify Irrad.
Select RS Mode
CAUTION
 Do not modify the inclination of the module during the obscuring operation
to avoid possible errors on measurements
 After
pressing the GO/STOP key, some different messages can be shown
by the meter (§ 6.4) and, in this case, the meter does not perform the test.
Check and, if possible, solve this situation before carrying on with the test
19. Press GO/STOP key to start the second measurement. If none of the previous error
messages are detected, the meter gives the definitive value of Rs parameter for the
panel under test as combination of two previous measurements
20. Press SAVE key to save the result and the “Saved data” message is displayed for a
while. Press ESC/MENU key to exit without saving and to go back to the previous
screen.