6.5.2.1. Meaning of measurement results
In general, the result of an IVCK test on Voc and Isc measurement is determined by the
following relationships. Please note the following parameters:
= average of open circuit voltage calculated over the last 10 stored
measurements
= average of short-circuit current calculated over the last 10 stored measurements
= Positive tolerance value on Voc = x
= Negative tolerance value on Voc = x
= Positive tolerance value on Isc = x
= Negative tolerance value on Isc = x
= Maximum instrument error declared on Voc (see § 10.1)
= Maximum instrument error declared on Isc (see § 10.1)
= Error on Voc measurement @ OPC
= error on Isc measurement @ OPC
The following conditions on parameters on the result are managed by the instrument:
Relation (1) is not verified but still applies:
Relations (1) and (2) are not verified, but still apply:
None of the relations (1), (2) and (3) are verified
(1) → Positive test result also considering instrument error in the measurement
(2) → Positive test result, except in case of instrument error in the measurement
(3) → Negative test result except in case of instrument error in the measurement
(4) → Negative test result also considering instrument error in the measurement
• The average values of Voc and Isc are displayed on the result page. These
values include the average values of Voc and Isc under OPC conditions
calculated as a rolling average of the last 10 previously stored tests If
the user has carried out and saved a number of tests <10 or reset the
average values, the average value displayed during test N+1 will be
calculated on the available N values.
• When using the instrument like this, the average values previously
calculated are particularly important. When starting a new measurement
campaign with significant variations in irradiance or temperature, it is
recommended to reset ("Reset AVG" control) the reference average
values and then recalculate them based on new measurements. Average
values are anyway zeroed in case the user changes the number of modules
and/or strings.