Chapter Three: Overview
Inside the Type 146 Unit
55
Hot Cathode
Located on the end of the Hot Cathode board is one coaxial connector and one 15-pin female
Type “D” connector. Table 14 shows the connector pinout of the coaxial connector and Table 16
shows the Type “D” connector pinout. A list of MKS hot cathode gauges, along with their
cables, is shown in Table 15.
Note
Only hot cathode gauges with nude tubes are CE compliant. Hot cathode
gauges with glass tubes are not CE compliant. If your 146 unit is CE
compliant, you must use a hot cathode gauge with a nude tube for the unit
to remain CE compliant.
The 146 unit offers several power control features designed for use with hot cathode gauges. If
the 146 unit detects a disconnected hot cathode, a tube short, or an open filament in the HC
gauge, it automatically turns off power to the gauge. To restore power to the gauge, toggle the
HC channel off and on again. This feature is always enabled.
Hot Cathode Coaxial Connector Pinout
Ion Current SMA
Ion Current
Center
Chassis Ground
Shield
Table 14: Hot Cathode Coaxial Connector Pinout
Hot Cathode Sensors and Cables
Sensor Type
Part Number
All MKS Hot Cathode Gauges Types IG-xx, RG75, and NRC563
consult factory
HPS low power, nude, Bayard-Alpert (B/A) hot cathode KF-40
100005987
HPS low power, nude, Bayard-Alpert (B/A) hot cathode 2¾ CF
100005980
Other nude or B/A tubes - thoriated iridium or tungsten filament
Consult factory
Cable Description
Part Number
Cable for glass envelope tubes
CB146-13, CB146S-13
Cable for glass envelope tubes and external power
CB146-16, CB146S-16
Cable for nude hot cathode tube
CB146-19, CB146S-19
Table 15: Hot Cathode Sensors and Cables
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