Section 5: Pulse measure and pulse generator units
Model 4200A-SCS Parameter Analyzer Reference Manual
5-46
4200A-901-01 Rev. C / February 2017
4200A-SCS power supply limitations
In some system configurations, the 4200A-SCS power supply cannot supply enough current if a test
has too many high power instruments enabled. Some system configurations may have enough
instruments installed to exceed the power supply limit if the selected test has too many channels
enabled.
Clarius tracks the instruments used in a test and calculates the maximum power required and
compares it to the maximum available power. If the test requires too much power, a message is
displayed and the test will not run.
The next table and the equations below it show how the power is calculated. The maximum power
available for each instrument in the test module is used in the calculation. The 4210-SMU High Power
SMU, 4225-PMU Ultra-Fast Pulse Measure Unit, and 4220-PGU High Voltage Pulse Generator draw
the majority of the power in the 4200A-SCS chassis.
There are two parts to the total power supply draw. The first part is the power required for the
instruments while the 4200A-SCS is idle (turned on, but not testing). The second part is the power
required by the instruments taking part in the test. Note that medium power SMUs (4200-SMU), 4200
preamplifiers (4200-PA), and 4210-CVU modules are not included in the equations, as their power
draw is not significant.
4200A-SCS power requirements
Instrument
Idle power
Test power
High Power SMU (4210-SMU)
NS
45
4225-PGU
29.4
NA
4225-PMU
50.4
NA
4225-RPM
4.2
NA
10 V PGU or PMU channel*
NA
8.4
40 V PGU or PMU channel*
NA
54.6
Medium Power SMU (4200-SMU)
NS
NS
4210-CVU
NS
NS
NS = Not Significant
NA = Not Available
* There are two channels for each PGU and PMU instrument card.
Equations to calculate power:
PowerIDLE = [(29.4 * nPGU) + (50.4 * nPMU) + (4.2 * nRPM)]
PowerTEST = [(45 * nHPSMU) + (8.4 * nC10) + (54.6 * nC40)]
PowerTOTAL = Pow PowerTEST
PowerTOTAL = 500 maximum. If PowerTOTAL is less than or equal to 500, the test proceeds.
Where:
•
nPGU = number of 4220-PGU cards in the 4200A-SCS chassis (idle power draw)
•
nPMU = number of 4225-PMU cards in the 4200A-SCS chassis (idle power draw)
•
nRPM = number of 4225-RPM modules connected to PMUs (idle power draw)
•
nHPSMU = number of High Power SMU (4210-SMU) in the test
•
nC10 = number of 10 V PGU or PMU channels in the test
•
nC40 = number of 40 V PGU or PMU channels in the test
