2400 Series SourceMeter
®
User’s Manual Source-Measure Concepts 6-17
Model 2420 SourceMeter
The general operating boundaries for the Model 2420 are shown in Figure 6-6. In this
drawing, the 3A, 20V and 1A, 60V magnitudes are nominal values. The actual maximum
output magnitudes of the SourceMeter are 3.15A, 21V and 1.05A, 63V.
These operating boundaries are valid only if the SourceMeter is being operated in an envi-
ronment where the ambient temperature is 30˚C or less.
NOTE Above 30˚C, high power operation could overheat the SourceMeter, causing the
output to turn off. See “Overheating protection,” page 6-6, and “Power equa-
tions to avoid shutdown,” page 6-7, for details.
The heavy solid lines show the limits for continuous output operation. Note that in quad-
rants II and IV (sink operation), the limits for the 3A and 1A ranges are derated as follows:
3A Range – Limits linearly derated from: -3A, 0V to -2A, 20V
3A, 0V to 2A, -20V
1A Range – Limits linearly derated from: -1A, 20V to -0.7A, 60V
1A, -20V to 0.7A, -60V
If the output duty cycle is decreased to 60% or less, sink operation limits are restored to
normal as shown by the dotted lines in Figure 6-6.
Figure 6-6
Model 2420 operating boundaries (T
amb
≤
30°C)
–I
= 100% Duty Cycle
≤ 60% Duty Cycle
(III)
Source
–V
+V
+I
(IV)
Sink
(II)
Sink
(I)
Source
-60V
-20V 20V
60V
-3A
-2A
-1A
1A
3A
2A
0.7A
-0.7A
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