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Table of Contents
Include:
- 275: small unit considered for noisebridge. Analog and digital versions. Can get analog < $50
- 303
- 307 (JM unit)
307
Has a separate power supply and digital side. RS-232 interface option.
Just from reading the manual sounds a little quirky…has some notes like that LED display is closely tied to the RS-232 output even when it doesn't always make sense.
says “HELIX TECHNOLOGY CORPORATION”
I purchased this unit because they are widely available on the surplus market and are a relatively inexpensive unit with computer interface option.
“307 VGC Cable Connections” [307 manual 1-9 (Figure 1-7). copyright Granville-Phillips]:
Power supply
WARNING: there are jumpers on the PCB that must be set correctly for given line voltage…the PS is NOT auto-ranging
1 and 2 port versions available. Each port can control one ion gauge. The collector (vacuum level signal) is connected separately to the controller instead of through the tube power connector.
“Standard Tube Base Configurations” [307 manual 1-8 (Figure 1-6). copyright Granville-Phillips]:
My gauge (CES (ETI?) 8136F):
From left to right:
| Pin | Signal | Notes |
|---|---|---|
| 1 | ||
| 2 | ||
| 3 (raised) | ||
| 4 | ||
| 5 |
Controller
