Keithley 2290-5 - Page 54

Section
8: Performance verification Model 2290-5 5 kV Power Supply
User's Manual
8-6 2290-5-900-01 Rev. A/December 2013
3. Turn on the power, and recall the Model 2290-5 default conditions. (Press RCL, 0, and then
ENTER.)
4. Select the multimeter DCV function, and enable autoranging.
5. With the high voltage off, allow the multimeter reading to settle and then enable REL to null any
residual offset voltage.
6. Set the Model 2290-5 output voltage to 5000V, and set the current limit to 5mA. Turn the high
voltage on.
7. Note the DMM reading, and then calculate the current as follows: I = V/R, where V is the
multimeter voltage reading, and R is the actual value of the 4.99 kΩ resistor measured in step 1.
8. Verify that the current computed in step 7 is within the limits as shown in the table (see
Table: DC
current accuracy summary) of the programmed current limit value. Also, make sure that the front
panel mA display reading is within the limits shown in the table.
9. Repeat steps 6 through 8 for the remaining currents listed in the next table. For each value:
• Program the current limit to the correct value.
• Measure and record the multimeter voltage reading.
• Compute the current from the voltage and resistance.
• Verify the computed and display current values are within required limits.
10. Turn off the high voltage, and allow the voltage to discharge.
11. Enable Filter 1, and then repeat the entire procedure with a 3000V output voltage.
Table: DC current accuracy summary
Current limit
setting
Multimeter
voltage
1
Calculated
current
2
Allowable current
range Filters off
Allowable current range
Filter 1 and 2 on
Lower limit Upper limit Lower limit Upper limit
500 µA V µA 497 µA 503 µA 495 µA 505 µA
1 mA
V
µA
0.997 mA
1.003 mA
0.995 mA
1.005 mA
1.5 mA
V
µA
1.497 mA
1.503 mA
1.495 mA
1.505 mA
2 mA
V
µA
1.997 mA
2.003 mA
1.995 mA
2.005 mA
2.5 mA
V
µA
2.497 mA
2.503 mA
2.495 mA
2.505 mA
3 mA
V
µA
2.997 mA
3.003 mA
2.995 mA
3.005 mA
3.5 mA
V
µA
3.497 mA
3.5003 mA
3.495 mA
3.505 mA
4 mA
V
µA
3.997 mA
4.003 mA
3.995 mA
4.005 mA
4.5 mA
V
µA
4.497 mA
4.503 mA
4.495 mA
4.505 mA
5 mA
V
µA
4.997 mA
5.003 mA
4.995 mA
5.006 mA
1Voltage across 4.99 kΩ resistor measured by multimeter.
2
Calculated as follows: I = V/R, where V= multimeter voltage reading and R= measured resistor value.