Troubleshooting
voltage
Table 8: Peaks Shifted Equally
possible cause perform check, test, or troubleshooting proced-
ure no. →
incorrect amplification factor
check U0 HSA3500 section → 8.2 , section 8.1 ,
section
Table 9: Peaks Shifted Differently
possible cause perform check, test, or troubleshooting proced-
ure no. →
malfunction of counter board
→section 9.1.2
one lens electrode not connected
Run a spectrum with high speed. Perform a
crosstalk test with all lens tubes. section→
8.4.2
malfunction of the energy sweep
generator
check the energy sweep →section , section
Table 10: Intensity Fluctuations
possible cause perform check, test, or troubleshooting
procedure no. →
field emission at the exit slit of the HSA Background signal independent of Ekin with
DE=const, rises with small Epass - values and
increases in DE/E=const mode. Remove wir-
eedge from the mesh at the exit slit.
sparks at the anode side of the CEM background signal is independent of Ekin in
DE/E=const mode and background to signal
ratio decreases with increasing of the pass
energy.
incorrect detector preamplifier
threshold
→ section 9.1.1
dark current at the isolation parts check spectra without excitation source 2nd:
disconnect the preamplifier and measure
again, see Chapter 9
Table 11: High Background Signal
possible cause perform check, test, or troubleshooting
54 PHOIBOS
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