Connection Check of the Analyzer Electrodes
8.4.1 Capacitance Check for Electrodes
Check the electrode connection to the electrical feedthrough. For this check a capacit-
ance meter must be used. The best way to check is to measure the capacitances
between the housing and all pins of the feedthrough of the analyzer (see Figure 33:
Schematics of the 12-pin Analyzer Feedthrough, page 72.). Switch off the HSA 3500 and
remove the connector to the HSA electrodes.
! Mind the safety information given at the beginning of this manual!
The capacitances measured on the HSA and lens electrodes under UHV conditions in
table 16, and table 17 are for information only. Some differences caused by the meter
should be taken into consideration when checking the values. Correct ratios between
the values show correct connection to the analyzer parts, the absolute values may differ
from the values in the table. Tables of former releases can be found in the documents
“Check-PHOIBOSRx.pdf”.
PIN
1
2
3
4
5
6
7
8
9
10
11
12
housing 32
147
123
37
121
-
65
71
323
62
170
Table 15: Capacitance Measurements (pF), PHOIBOS100 R6 or higher
PIN
1
2
3
4
5
6
7
8
9
10
11
12
housing
60
191
139
63
124
-
71
79
396
109
303
Table 16: Capacitance Measurements (pF), PHOIBOS150 R6 or higher
If the measured capacitances differ substantially from the nominal values please contact
SPECS. If the capacitances have nearly the right values, no short circuit inside the spec-
trometer is likely. If the measured capacitances have the correct values, a missing con-
tact from the HSA 3500 to the analyzer may be the reason for a faulty spectrum (see
section 8.4.2 , " on page 71).
8.4.2 Check the Cable Contacts
The connection to the analyzer and the detector are supplied by two multi-pin vacuum
feedthroughs, which are designed for high voltages up to 5 kV. Check whether the con-
tacts are in good condition. Since the plug is a movable part which is frequently
plugged and unplugged, it can become defective. In most cases, contact failures in the
plug are the reason.
●
A 12-pin feedthrough on a flange DN38CF, mounted to the lens housing, for all
voltages of lens electrodes and capacitor electrodes, which is schematically
shown in figure 33, page 72.
●
The second 12-pin feedthrough (DN38CF) mounted at the detector flange, for
all channeltron voltages and channeltron outputs. The pin assignments is shown
71
Summary of Contents for PHOIBOS 100
Page 1: ...PHOIBOS Hemispherical Energy Analyzer Series PHOIBOS 100 PHOIBOS 150 3 1...
Page 6: ...Table of Contents PHOIBOS...
Page 10: ...Introduction 4 PHOIBOS...
Page 13: ...Electrical Connections Figure 2 Connection Scheme PHOIBOS 7...
Page 14: ...Components and Connections Figure 3 Analyzer Housing PHOIBOS100 8 PHOIBOS...
Page 15: ...Electrical Connections Figure 4 Analyzer Housing PHOIBOS150 PHOIBOS 9...
Page 42: ......
Page 51: ...SpecsLab Hardware and Software Installation PHOIBOS 45...
Page 52: ......
Page 62: ......
Page 78: ...Analyzer Checks Figure 33 Schematics of the 12 pin Analyzer Feedthrough 72 PHOIBOS...
Page 80: ......
Page 86: ......
Page 92: ...List of Figures Figure 39 Alignment Pin 84 II PHOIBOS...
Page 93: ...List of Figures PHOIBOS III...
Page 94: ......
Page 96: ......
Page 98: ...Index PHOIBOS...
