-5 5 kV Power Supply User's Manual Section 4:
2290-5-900-01 Rev. A/December 2013 4-7
FILT(?) <n>
The FILT command controls the output filter, which is useful for reducing output ripple and noise.
When <n> = 0 the output filter is disabled, while <n> = 1 and <n> = 2 enable Filter 1 and Filter 2,
respectively. The FILT? query returns the state of the filter.
Example:
FILT 1
Enable Filter 1
Default value: 0
When the filter is changed, the high voltage is turned off. The unit does not actually change the filter
until the high voltage has dropped below 100 VDC. If the high voltage is turned on remotely while the
filter is in the process of changing, an error will result. So if the commands FILT 1;HVON are sent,
an Err7 (illegal GPIB command) will appear. To avoid this situation, insert a *WAI (wait command)
between the two. The command string FILT 1;*WAI;HVON is valid.
For more information about the output filter, see the Output filter topic.
Interface control commands
*RST
The *RST (Reset) common command resets the Model 2290-5 to its default configuration. This
command performs the same function as holding down the front panel CLR button at power-on.
*IDN?
The *IDN? (Identification) common query returns the Model 2290-5 device configuration. The
response string is in the format:
KEITHLEY INSTRUMENTS INC., MODEL 2290-5, <serial_number>, <version_number>
Where:
2290-5 is the model number.
serial_number is the serial number of the particular unit.
version_number is the 3-digit firmware version level.
*WAI
The *WAI common command is a synchronization command that halts further command processing
until all present commands are complete. For example, the commands FILT 1;*WAI;HVON will
change the output filter setting, wait until the operation is complete, and turn the high voltage back on.
Status reporting commands
The following commands control various status reporting aspects.
*CLS
The *CLS (Clear Status) common command clears all status registers.
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