4 Using the Solar Array Simulator
64 Series E4360 User’s Guide
Operating in SAS Mode
SAS mode uses an exponential model to approximate the I-V curve as
illustrated in the following figure. It is programmed in terms of its open
circuit voltage (Voc), short circuit current (Isc), maximum voltage point
(Vmp), and maximum current point (Imp) at the approximate peak power
point (see Appendix A for model equations). SAS operation is achieved
by sampling the output voltage, applying a low-pass filter, and
continually adjusting the constant current loop by using the filtered
voltage as an index into the exponential model.
Curve Resolution
When operating in SAS mode, the four curve parameters are converted
into a DAC table consisting of a monotonic collection of I-V points,
which are used by the instrument to control the output. You have a
choice in the size of this DAC table to optimize your application for either
better table resolution or faster update speed. (Update speed is defined
as the time it takes to generate and activate a new DAC table.) Specify
the table resolution as follows:
Front Panel:
SCPI Command:
Select Output\Resolution.
Select either Low or High.
To specify low resolution send:
CURR:MODE:DTAB 256,(@1)
To specify high resolution send:
NOTE
This command can only be programmed when the instrument is
operating in Fixed mode. An error will be generated if this command is
sent when the instrument is operating in SAS or in Table mode.
I
V
sc
mp oc
mp
I
I
V V
60V 65V = E4361A
0
V
I
MAXIMUM
VOLTAGE
TYPICAL CURVE
MAXIMUM CURRENT
P
mp
POINTS UNDER
DASHED LINE
ARE INVALID
120V 130V = E4362A
E4361A = 8.5A
E4362A = 5A
510W = E4361A
600W = E4362A
= 1 Ω min (E4362A)
= .25 Ω min (E4361A)
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