3: Basic operations Model 2290-5 5 kV Power Supply
3-2 2290-5-900-01 Rev. A/December 2013
Output filter
The Model 2290-5 employs a switchable output filter for low noise performance. If higher slew rate or
output power is required, the filter can be disabled. When the filter is enabled, the unit can reach
either maximum voltage or maximum current but not both simultaneously. The filter has three
possible settings: Filter Disabled (Filter 0); Filter Enabled, High Current (Filter 1); and Filter Enabled,
High Voltage (Filter 2).
The output filter determines the voltage and current limits, as well as the ripple and noise
performance of the unit. Note that the noise reduction characteristics for the two filters are identical,
but other factors such as rise and discharge times virtually depend on the selected filter (see
specifications). See the specifications for information on ripple and noise for the different filter
settings. The voltage and current limits for the different filter settings are listed in the next table.
Filter mode Voltage limit Current limit Current trip
High Current Filter (Filter 1)
High Voltage Filter (Filter 2)
It is recommended that you turn off the output before changing the filter. If the filter is changed while
the high voltage is on, the unit will turn off the high voltage and wait until the voltage has dropped
below 100 VDC before switching the filter. This is done to minimize stress on the filter components.
During this time, the HIGH VOLTAGE ON switch is disabled. If the filter is changed while the high
voltage is off, it will switch immediately.
To display and change the present filter value:
1. Press the FILTER button to display the current filter selection in the center display.
2. Press FILTER 1 or FILTER 2 at the FIL display prompt (the associated FILTER LED will turn on
to indicate that the filter is enabled).
3. Enter a new filter value (enter the value), then press the ENTER button.
4. To turn off filtering, press FILTER then NO FILTER followed by ENTER.
If an illegal value is entered, the unit will display Err2 (illegal parameter entered). Use the CLR button
to clear any error messages.
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