Keithley 2651A Reference Manual page 705

Model 2651A High Power System SourceMeter® Instrument Reference Manual
Test considerations
When performing the verification procedures:
•
Be sure to restore factory front panel defaults as outlined above.
•
Make sure that the test equipment is properly warmed up and connected to the Model 2651A
output terminals (use 4-wire sensing for voltage).
•
Make sure the Model 2651A is set to the correct source range.
•
Be sure the Model 2651A output is turned on before making measurements.
•
Be sure the test equipment is set up for the proper function and range.
•
Allow the Model 2651A output signal to settle before making a measurement.
•
Do not connect test equipment to the Model 2651A through a scanner, multiplexer, or other
switching equipment.
The maximum common-mode voltage (voltage between LO and chassis ground) is 250V DC.
Exceeding this value may cause a break down in insulation, creating a shock hazard.
The Input/Output terminals of the Model 2651A are rated for connection to circuits rated
Installation Category I only, with transients rated less than 1500V peak. Do not connect the
Model 2651A terminals to CAT II, CAT III, or CAT IV circuits. Connection of the Model 2651A
terminals to circuits higher than CAT I can cause damage to the equipment or expose the
operator to hazardous voltage.
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 2651A
while the unit is on. Power off the equipment from the front panel or disconnect the main
power cord from the rear of the Model 2651A before handling cables connected to the outputs.
Putting the equipment into standby mode does not guarantee the outputs are not powered if a
hardware or software fault occurs.
Setting the source range and output value
Before testing each verification point, you must properly set the source range and output value.
To set the source range and output value:
1. Press the SRC key to select the appropriate source function.
2. Press the navigation wheel
3. When the cursor in the source display field is flashing, set the source range to the range being
verified. Use the up or down RANGE keys to select the range.
4. Use the navigation wheel
and then press the navigation wheel
2651A-901-01 Rev. A / March 2011
WARNING
to enable the edit mode (EDIT indicator on).
and CURSOR keys to set the source value to the required value,
to complete editing.
Appendix B: Calibration
B-5