HT instruments SOLAR I-V - Manual (Page 49)

I-V400 - SOLAR I-V
EN - 47
6.2.4. Serial resistance Rs
The serial resistance Rs is one of the typical elements of PV modules which can affect the
I-V curve measurement of the panels themselves. The instrument meter performs the Rs
calculation, during the measurement of I-V curve (§ 6.2.1), in the following modes:
 AUTOMATIC
mode  the Rs calculation is automatically performed by meter using an
approximate evaluation based on the measurement of I-V curve.
 MANUAL mode  the Rs value is given by the internal database where it can be
manually input by the operator (§ 5.3.1) or measured (§ 6.2.4.1).
6.2.4.1. Serial resistance Rs measurement
The reference standard IEC/EN60891 defines the Rs value with 2 different consecutive
measurements at the following conditions:
 Measurement #1: irradiance > 500 W/m
2
 Measurement #2: irradiance less respect to the previous measurement #1
CAUTION
The maximum voltage among P1, P2, C1, and C2 inputs is 1000V DC. Do
not measure voltages exceeding the limits prescribed by this manual.
Should you exceed the voltage limits you could damage the instrument
and/or its components or endanger your safety.
1. Turn on the meter by pressing ON/OFF key.
2. Check the specifications of the reference cell (parameters Alpha and Sens.) on meter
depending on the type of module MONOcrystal or MULTIcrystal under test (§ 5.1.4)
3. Check the minimum irradiance threshold set on meter (§ 5.1.5). It is recommended to
perform measurements with threshold
 700 W/m 2
in compliance with IEC/EN60891
standard
4. Press ESC/MENU key to enter to the herewith main menu
5. Select the “I-V” item and press ENTER to access the I-V curve measurement §
6. Press the ENTER key, select the “Settings” item and
confirm again with ENTER. Select the type of PV module
under test among the available models as described in §
5.3.1.
15/05/10 15:34:26
V d c = 0 . 0 V
I r r = - - - W / m 2
T c = - - - ° C
Module: PANEL01
S e t t i n g s
M e a s . T y p e 
Select I - V
7. Note the name of the selected module (ex: SUNPOWER 210) in the screen