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16 General Information
I
V
sc
mp oc
mp
I
I
VV
120V 130V = E4351B
0
E4351B = 4A
480W MAX
= 1
Ω
min (E4351B)
.25
Ω
min (E4350B)
V
I
MAXIMUM
VOLTAGE
TYPICAL CURVE
MAXIMUM CURRENT
E4350B = 8A
P
mp
POINTS UNDER
DASHED LINE
ARE INVALID
60V 65V = E4350B
Figure 1-2. Simulator Mode Characteristic
Note that under certain conditions, such as if Imp is significantly less than Isc, the model equation will exhibit a certain
degree of inaccuracy in that the actual maximum power point (Pmp) and value may be somewhat different from the
expected value of Pmp (Imp x Vmp). Thus the actual Pmp point may not occur at exactly the Imp x Vmp. This can be
corrected by entering new values for Imp and Vmp (see Figure A-1 in appendix A).
Also note that the accuracy specifications in simulator mode are relative to the values given in the exponential equations,
and not necessarily to the input parameters Imp and Vmp. However, the Isc and Voc values are always accurately given by
the exponential equations.
Restrictions:
■ Maximum Power
≤
480 W
■ Voc
≤
130 V (E4351B) or 65 V (E4350B)
■ Isc
≤
4 A (E4351B) or 8 A (E4350B)
■ Vmp < Voc
■ Imp
≤
Isc
■ ∆
V/
∆
I
≥
.25
Ω
for Agilent E4350B;
≥
1
Ω
for Agilent E4351B
NOTE: When the unit detects invalid equation parameters, it will generate an error, light the ERR annunciator on the
front panel, and will not use the new parameters. Instead, it will operate with the last valid settings. Therefore,
although it may seem that the unit is operating correctly, it will NOT be using the values that you have
programmed for simulator mode.
If simulator mode is entered with no parameters specified, E4350B E4351B
the default values that will be used are: Voc 61.5 V 123 V
Vmp 49.2 V 98.4 V
Imp 6.528 A 3.264 A
Isc 8.16 A 4.08 A
Pmp 321.2 W 321.2 W