Keithley SourceMeter 2600 Series Reference Manual page 214

8-8 Source-Measure Concepts
Maximum duty cycle equation
NOTE
NOTE
Model 2601/2602 Maximum Duty Cycle equation constants
Constant
P
HS
V
OA
Model 2611/2612 Maximum Duty Cycle equation constants
Constant
P
HS
V
OA
1. Equations apply to both channels, sinking or sourcing power simultaneously.
2. If a duty cycle less than 100% is required to avoid overheating, the maximum on time must be less than
10 seconds.
2600S-901-01 Rev. A / May 2006
(
P – T
CS DER
≤ -------------------------------------------------------------------------------------------
DC
MAX
(
When attempting to determine the maximum duty cycle where the
off state will be 0V or 0A:
• I is 0
B
• I and V
P P
SourceMeter is on.
This maximum duty cycle equation is an approximation. In general,
if the duty cycle calculation yields a number > 90% then DC under
those conditions should not cause the SourceMeter to overheat.
However, if the calculation yields a number < 10%, the calculated
duty cycle should not be exceeded by more than 0.5% to avoid
potential overheating.
100mV range
56
18
200mV range
56
38
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Series 2600 System SourceMeters Reference Manual
1, 2
) ( ) V (
– V – V
OA B
) I ( )
V – V
OA P P
are the voltage and current levels when the
1V range
56
18
2V range
56
38
Section 8 topics
2
)
B
×
100
6V range 40V range
56 56
18 56
20V range 200V range
56 48
38 222