Using the HSA
2.3.2.3 Check/set offset and gain with voltmeter
Adjustment and calibration of the power suppliy has been performed at the factory.
Normally no additional work is necessary after installation. The procedures described
in this chapter are only necessary for service and/or fine tuning.
To calibrate the voltage modules with a high voltage probe (1000:1) and a voltmeter,
you have to set the kinetic energy and the workfunction via software (HSA3500 Jug-
gler or FixedEnergies mode in SpecsLab2). For the offset calibration set all to zero
(do not forget the work function). For the gain calibration please set as close to the
end of the module range as possible.
1. Warm up the HSA for at least 30min. Switch off and on again to reboot and
force a startup calibration.
2. Use the HSA3500 Juggler program to set all voltages or define a region in
SpecsLab2 with the analyzer mode FixedEnergies and a sufficient number of
values (the product of values multiplied with Dwell Time defines the time for
the measurement in this FixedEnergies mode!)
3. Set the workfunction in the region to zero.
4. Set the kinetic energy and pass energy.
5. Set the multiplier voltage to 0 V (for your safety!).
6. Run a spectrum in FixedEnergies mode or apply the setting with the Juggler.
7. Check the spectrometer output voltage U0 of the HSA (analyzer box: pin9 fig-
ure 36, page 71) with U0 = Ekin - Ep + WF. For the high voltage ranges 1500V
and 3500V, use the HV probe.
8. Change the offset value for the selected energy range in the "Analyzer/Set-
tings" menu.
9. Depending on the software version the HSA can reboot after confirmation of
the settings (versions before September 2003, include startup calibration).
This needs a few seconds and ends with a beep of the unit.
10. Repeat the procedure for each desired voltage range.
11. Repeat the procedure (except item 1) with an energy value close to the end
of the module range to correct the gain in each desired voltage range (see
examples in table 10 and table 11 on page 19).
12. The gain is defined as
gain=
required value
measured value
.
20 HSA3500 / HSA3500 plus Power Supply
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