Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 2: General operation
2657A-901-01 Rev. B/December 2012 2-35
Hazardous voltages may be present on the output and guard terminals. To prevent electrical shock
that could cause injury or death, never make or break connections to the Model 2657A while the
output is on. Power off the equipment from the front panel or disconnect the main power cord
from the rear of the Model 2657A before handling cables connected to the outputs. Putting the
equipment into standby does not guarantee the outputs are not powered if a hardware or software
fault occurs.
To perform power measurements from the front panel:
1. Set source function and value. Press the SRC key to select the voltage or current source function
as required.
2. Set the output voltage or current to an appropriate value. See Step 1 of Front-panel source-
measure procedure (on page 2-24) earlier in this section.
3. Press the LIMIT key and set the voltage or current limit high enough for the expected voltage or
current across the DUT to be measured. See Step 2 of Front-panel source-measure procedure
(on page 2-24) earlier in this section.
4. Press the MEAS key as many times as needed to display power.
5. Press the OUTPUT ON/OFF control to turn the output
on.
6. View the displayed reading (press the TRIG key if necessary).
7. When finished, press the OUTPUT ON/OFF control again to turn the output off.
Power measurements using the remote interface
The following paragraphs summarize basic power measurement commands using the remote
interface and also give a programming example for a typical power measurement situation.
Remote power reading command
The programming example below illustrates how to obtain a power reading from SMU A:
reading = smua.measure.p()
See Remote source-measure commands (on page 2-25) for more commands necessary to set up
source and measure functions and also Introduction to TSP operation
(on page 5-1).
Power measurement programming example
The following programming example illustrates the setup and command sequence for a typical power
measurement procedure with the following parameters:
• Source function: voltage, source autorange, 1000 V output
• Current measure function and range: current, autorange
• Current compliance: 50 mA
WARNING
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