Endress+Hauser Analytik Jena PlasmaQuant MS Series, Service Manual, Page: 197 / 221

PlasmaQuant MS Series Power Supply
197
Electrode/lens Range Adjustment Ripple Nominal
current
Settling
times
Detector
protection
Mirror ml 0 →+4 00V 125mV ± 5mV 10uA ≥35ms N/A
Mirror mr 0 →+400V 125mV ± 5mV 10uA ≥35ms N/A
Mirror mb 0 →+400V 125mV ± 5mV 10uA ≥35ms N/A
Entrance lens EL - 10V →
+10V
15mV ± 1mV 10uA ≥35ms N/A
Entrance plate EP - 200V →+0V 50mV ± 1mV 10uA ≥35ms N/A
Fringe electrodes FR -1 0V →
+10V
5mV ± 1mV 10uA ≥35ms N/A
Detector focus DF -580V or +160V 125mV ± 5V 10uA ≥6ms →+160V
tr < 10us
Recovery
tf < 100us
Table 17 - Fundamental properties of each electrode
11.4 Testing and Servicing
The board can be tested and serviced either at the board (system) level, or at the
component level. In either case, the board level testing needs to be applied first, in
order to identify if the board is functional or not. If a board is considered as non-
functional, it then can be either replaced by a functional board, or if justified tested
further and repaired on the component level. While the testing and servicing at the
board level mainly requires commonly available tools and instruments (such as a
multimeter and high voltage probe), the repair at the component level may require
some special instruments and tools (such as signal or pattern generators and storage
oscilloscopes).
Test points on the board are assigned with one of the three colors (black= low voltage,
red= high voltage and green = ground). The colors are intended for easier finding of
test points and to indicate the expected voltage range of the associated node.
However, before accessing any test point, confirm its assignment and the expected
voltage range by identifying its label. While a TP with wrong color can be installed
accidentally during the board assembling, it is much less likely that TP labels will be
swapped since it is a design feature of the PCB silk screen.
The following are some of the recommended diagnostic procedures for examination of
potentially faulty boards. The described methods will help to identify the most likely
problems, however they should not be considered as an exhaustive diagnostics
register.
Test point color coding: