Inside the Type 146 Unit
Chapter Three: Overview
56
Hot Cathode Type “D” Connector Pinout
Pin Number
Assignment
1
Fi
2
Chassis Ground
3
Filament -
4
+15 Volt Output
5
115 Volt Output
6
Grid/Degas -
7
External -15 Volts (high power)
8
Grid/Degas +
9
Fi
10
Ex15 Volts
11
Filament -
12
Power Ground
13
Grid/Degas -
14
External -15 Volts (Current limited)
15
Grid/Degas +
Table 16: Hot Cathode Type “D” Connector Pinout
Note
All ion gauges show an inability to establish an ion current at high
pressures. The gauge may respond as if the pressure is extremely low.
Keep this characteristic in mind when setting a disconnect threshold,
alarm trip points, or if you designate an ion gauge as a reference channel.
Provision for External Power to a Hot Cathode
The 146 unit can supply a maximum of 45 watts to a hot cathode. If the hot cathode is
undergoing a high power degas, all of the 45 watts is used for the degassing process. If the hot
cathode is undergoing a low power degas, the filament is powered for measurement, and the
remaining power is used for the degassing function.
Power from the internal power supply is supplied to the hot cathode board via looping the supply
in the rear panel connector. If preferred, a cable can be supplied which does not loop the power
into the hot cathode board. The optional cable provides a line that can be connected to an
external power source. The external power source would then power the hot cathode board. A
90 watt, ± 15 Volt, external power supply can provide 60 watts for degassing in the high or low
power degas mode.
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