Keithley 2290-5 - Safely Connect to Instruments; Line Voltage Selection; Line Fuse; Interlock Circuit

Section
2: Safe configuration and test setup Model 2290-5 5 kV Power Supply
User's Manual
2-2 2290-5-900-01 Rev. A/December 2013
Safely connect to instruments
Line voltage selection
There are three versions of the Model 2290-5 to allow operation from a 100, 120, 220, or 240 V
nominal AC power source with a line frequency of 50 or 60 Hz. Before connecting the power cord to a
power source, verify that the line voltage selector card, located in the rear panel fuse holder, is set for
the correct AC line voltage.
The following table indicates the three versions of the Model 2290-5 5 kV power supply and their
respective line voltage:
Model Nominal voltage
2290-5
120 V AC
2290E-5
220/240 V AC
2290J-5
100 V AC
This instrument may be damaged if operated with the line voltage selector set for the wrong AC line
voltage, or if the wrong fuse is installed.
Line fuse
Verify that the correct line fuse is installed before connecting the line cord as follows:
Model Line voltage Fuse type Keithley fuse
part number
2290-5
120 V AC
1 A, 250 V, 3 AG, Slow Blow
FU-10
2290J-5
100 VAC
2290E-5
220/240 V AC
1/2 A, 250 V, 3 AG, Slow
Blow
FU-4
Interlock circuit
An interlock circuit is provided on the rear panel of the instrument. This circuit must be engaged to
allow the Model 2290-5 to produce output voltages. When the safety interlock signal is engaged, all
voltage ranges of the instrument are available. However, when the safety interlock signal is
disengaged, the output voltage is turned off.
The Model 2290-5 is provided with an interlock circuit that must be engaged to allow high
voltage output. The interlock helps facilitate safe operation of the equipment in a test
system. Bypassing the interlock could expose the operator to hazardous voltages that could
result in personal injury or death.