HT PVCHECK, Manual

Page: 13 / 56

PVCHECK 11
5.1.5. Irradiance
This section allows setting the minimum irradiance threshold both for IVCK measurement
and for efficiency test on a PV installation.
1.
Position the cursor onto “
Irradiance
” by using the arrow keys
and confirm with ENTER .
2.
The display shows the screen containing “
Min Irr IVCK
”, which
allows setting the minimum irradiance threshold expressed in
W/m
2
, used by the instrument as a reference during IVCK
measurement, and “
Min Irr EFF
”, which allows setting the
minimum irradiance threshold expressed in W/m
2
, used by the
instrument as a reference while measuring the efficiency of a
PV installation. Use the arrow keys
to switch between
the two items.
3. To set the minimum irradiance threshold, use the arrow keys
. To obtain results with the accuracy guaranteed in this
manual, we recommend following the instructions given in § 10.
The value can be set within the following range:
0

800 W/m
2
4. Press Press the SAVE key to save the settings made; the
message “Data saved” will be displayed for a few seconds. Press
the
ESC/MENU key to exit without saving and go back to the
previous screen
CAUTION
The “0 W/m
2
” setting for parameter “Irr min IVCK” allows carrying out IVCK
measurements without the following conditions being checked:

Connection of reference cell to IRR input of the instrument

Unsteady irradiation values
Number of modules consistent with the measured open circuit voltage
5.1.6. DC Clamp
This option allows setting a possible correction factor K for the DC clamp, in order to
improve current measurement. If present, the correction factor is indicated on the rear label
of the clamp itself, indicated as:
In case no label is present, set k = 1.000
1.
Position the cursor onto “
DC Clamp
” by using the arrow keys
and confirm with ENTER .
2.
The display shows the item “DC clamp K”, which allows setting
the corrective factor in the following range
0.950 to 1.050 . Set
the desired values by means of the arrow keys
3. Press the SAVE key to save the settings made; the message
“Data saved” will be displayed for a few seconds. Press the
ESC/MENU key to exit without saving and go back to the
previous screen.
“
K= X.xxx