2400 Series SourceMeter
®
User’s Manual Source-Measure Concepts 6-7
Above 30˚C, for both source and sink operation, the SourceMeter will not overheat if the
high power range(s) is not used. For the Models 2400 and 2410, the high power range is
1A. For the Model 2420, the high power ranges are 20V, 3A and 60V, 1A. For the Model
2425 and Model 2430 DC Mode, the high power ranges are 20V, 3A and 100V, 1A. For
the Model 2440, the high power ranges are 10V, 5A and 40V, 1A.
NOTE See “Operating boundaries” for details on source and sink operation.
Power equations to avoid shutdown
Power equations can be used to determine if the SourceMeter will shut down. For the fol-
lowing power equations:
I
OUT
= SourceMeter measured current* (in amps)
V
OUT
= SourceMeter measured voltage* (in volts)
DC = Duty cycle** (0 to 1) (i.e. 50% = 0.5)
T
AMB
= Ambient temperature (0˚ to 50˚C)
*For sink operation, I
OUT
or V
OUT
(but not both) must be a negative number. The excep-
tion is |I
OUT
| which is a magnitude (absolute value).
**If a duty cycle of less than 1 is required for the equations to be true, then the maximum
output on-time must be less than 10 seconds.
Model 2400 SourceMeter
When using the 1A range, you can use the two equations below to determine if the
SourceMeter will overheat. Both of the equations must be true to ensure that the
SourceMeter will not overheat. The result of the first equation must be ≤150 and the result
of the second equation must be ≤120.
1A range power equations:
{[(14 × |I
OUT
|) - (0.4 × V
OUT
× I
OUT
)] × 8.5 × DC} + T
AMB
≤ 150
and
{[20 + (|I
OUT
| × 36 × DC)] × 1.6} + T
AMB
≤ 120
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