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Section 4: Theory of operation
P
The maximum power generated in an instrument channel that can be properly dissipated by the
CS
instrument cooling system measured in watts. For the Model 2651A, this constant equals 370.
T
The ambient temperature of the instrument operating environment.
AMB
P
= 3(T
DER
This factor represents the number of watts the instrument is derated when operating in environments
above 30° C. The maximum output power is reduced by 3 W per degree C above 30° C.
P
DER
V
The instrument output amplifier voltage. This constant can be found in the tables below.
OA
V
The voltage level the instrument is attempting to force while at the pulse level.
P
When operating in quadrants 1 or 3 (sourcing power), the sign of this voltage must be positive when
used in the power equations.
When operating in quadrants 2 or 4 (sinking power), the sign of this voltage must be negative when
used in the power equations.
V
The voltage level the instrument is attempting to force while at the bias level.
B
When operating in quadrants 1 or 3 (sourcing power), the sign of this voltage must be positive when
used in the power equations.
When operating in quadrants 2 or 4 (sinking power), the sign of this voltage must be negative when
used in the power equations.
I
The current flowing through the instrument channel while at the pulse level.
P
I
The current flowing through the instrument channel while at the bias level.
B
Maximum duty cycle equation
When attempting to determine the maximum duty cycle, where the off state will be 0 V or 0 A:
I
is 0
B
I
and V
P
Model 2651A maximum duty cycle equation constants
Constant
V
OA
4-4
Model 2651A High Power System SourceMeter® Instrument Reference Manual
- 30)
AMB
is 0 when the ambient temperature is below 30° C.
(P
– P
CS
DC
MAX
|(V
– V
OA
are the voltage and current levels when the instrument is on
P
100 mV
1 V
range
range
18.5
18.5
) – |(V
) (I
– V
DER
OA
B
)(I
)| – |(V
)(I
– V
P
P
OA
B
NOTE
10 V
20 V
range
range
18.5
27
)|
B
)|
B
40 V
range
64
2651A-901-01 Rev. A / March 2011
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Table of Contents
Troubleshooting
