Keithley 2290-5 - DC Current Limit Accuracy

Model 2290
-5 5 kV Power Supply User's Manual Section 8:
Performance verification
2290-5-900-01 Rev. A/December 2013 8-5
DC current limit accuracy
The DC current accuracy test measures the accuracy of the output current limit and the mA (current)
display.
1. Using the ohms function of the multimeter, measure and record the value of the 4.99 kΩ resistor.
2. With the power off, connect the 4.99 kΩ resistor, the 1 MΩ load resistor, and the multimeter to the
Model 2290-5 HIGH VOLTAGE output connector, as shown in the next figure. Note that the
multimeter is connected across the 4.99 kΩ resistor.
Turn off high voltage and allow ample time for the voltage to discharge before changing any
connections.
For safety purposes, the resistors must be mounted within a safety shield connected to
safety earth ground using #18 AWG or larger wire. Be sure to connect the 4.99 k Ω resistor
to the low (chassis side) of the Model 2290-5 output. Otherwise, the multimeter will be
floated 5 kV above earth ground, which could result in instrument damage or risk of electric
shock.
Figure 18: Model 2290-5 Connections for DC current accuracy tests