15
Recalibrating the Channels
To ensure the highest accuracy and performance, the HVS448 should occasionally be recalibrated in normal use and must be
recalibrated following a firmware upgrade, which overwrites all the internal calibration data. For operations of low current
where current accuracy is critical, recalibration should be performed before each experiment. For these operations, the HVS448
should be powered up and left on for a minimum of 30 minutes prior to recalibration.
1.
Turn off the HVS448 and disconnect everything from the high voltage outputs.
2.
Enable the high voltage connections by connecting the supplied 50-Ω terminator to the Interlock Input on the back panel.
3.
Connect the HVS448 to your computer and turn on the unit.
Note
: For best results, leave the unit on at least 30 minutes before calibration.
4.
Run the Sequence software.
5.
In Sequence, enter
Online
mode by clicking the
toolbar button.
6.
Click the
toolbar button to enable high voltage. The “All” indicator on the HVS448 front panel LED should glow green
after a few seconds.
7.
In Sequence, choose
Actions>Calibration>Recalibrate
. As the system recalibrates you will hear a relay clicking inside the
HVS448, and the front panel LEDs will flash red and green.
8.
When all the tasks are done, choose
Actions>Calibration>Save
.
The system is now recalibrated and is ready for use.
WARNING:
While the HVS is recalibrating the high voltage channels are supplying up to the maximum voltage to
the high voltage connectors. Ensure everything is disconnected from the high voltage connectors
(except for the interlock terminator) on the back panel before performing a recalibration.
Note:
If after performing a calibration you wish to return to the previously saved calibration choose
Actions>Calibration>
Restore Calibration
.
