Table 8-2 Model 2601/2602 Maximum Duty Cycle Equation Constants; Table 8-3 Model 2611/2612/2635/2636 Maximum Duty Cycle Equation Constants - Keithley 2601 Reference Manual

Section 8: Source-Measure Concepts
Maximum duty cycle equation
NOTE When attempting to determine the maximum duty cycle where the off
CAUTION
Table 8-2
Model 2601/2602 Maximum Duty Cycle equation constants
Constant
P
HS
V
OA
Table 8-3
Model 2611/2612/2635/2636 Maximum Duty Cycle equation constants
Constant
P
HS
V
OA
Examples
Example 1:
Using a Model 2611 to charge a 5V battery with 1.5A, while operating at 50°C ambient
temperature; what is the maximum duty cycle?
1. Equations apply to both channels, sinking or sourcing power simultaneously. If a duty cycle less than 100% is required to avoid
overheating, the maximum on time must be less than 10 seconds
8-6
(
P T
–
CS DER
≤
-------------------------------------------------------------------------------- -
DC
MAX (
state will be 0V or 0A:
• I is 0
B
• I and V are the voltage and current levels when the
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
100mV range
56
18
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Series 2600 System SourceMeter® Instruments Reference Manual
1
) ( ) V (
V V
– –
OA B B
) I ( )
V V
–
OA P P
1V range
56
18
1V range
56
18
2
)
×
100
6V range
56
18
6V range
56
18
2600S-901-01 Rev. C / January 2008