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1-14
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4.
Line frequency
The Model 2790 will operate at line frequencies from 45Hz to 66Hz, and 360Hz to 440Hz.
There are no user-settings for line frequency. It is automatically sensed at power-up. The
following command can be used to read the line frequency:
SYSTem:LFRequency?
Setting line voltage and replacing fuse
A rear panel fuse located next to the AC receptacle protects the power line input of the
instrument. If the line voltage setting needs to be changed or the line fuse needs to be
replaced, perform the following steps.
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1.
2.
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3.
The power cord supplied with the Model 2790 contains a separate
ground wire for use with grounded outlets. When proper connections
are made, instrument chassis is connected to power line ground
through the ground wire in the power cord. Failure to use a grounded
outlet may result in personal injury or death due to electric shock.
The maximum voltage between any switching module terminal and
chassis ground is 42V. DO NOT connect any external sources to
switching modules.
Turn on the instrument by pressing the front panel power switch to the on (I)
position.
Make sure the instrument is disconnected from the AC line and other
equipment before changing the line voltage setting or replacing the line
fuse.
Place the tip of a flat-blade screwdriver into the power module by the fuse holder
assembly
(Figure
1-3). Gently push in and up. Release pressure on the assembly
and its internal spring will push it out of the power module.
Remove the fuse and replace it with the type listed in
For continued protection against fire or instrument damage, only
replace fuse with the type and rating listed. If the instrument repeat-
edly blows fuses, locate and correct the cause of the trouble before
replacing the fuse.
If configuring the instrument for a different line voltage, remove the line voltage
selector from the assembly and rotate it to the proper position. When the selector is
installed into the fuse holder assembly, the correct line voltage appears sideways in
the window.
Model 2790 SourceMeter
' Query power line frequency.
®
Switch System Reference Manual
Table
1-2.
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