User's Manual

174-082010_Digital AVC Page 4 of 17
This manual contains technical and general information relating to the installation, operation, and
calibration of vacuum gauges and gauge tubes manufactured by Teledyne Hastings Instruments (THI).
For best performance, THI vacuum gauges should be operated with the appropriate THI gauge tube.
Attempting to use a THI vacuum gauge with another manufacturer’s tubes may result in damage to both
the gauge and tube.
1.1 Features
The THI Digital AVC (DAVC), is a digital readout version of THI’s AVC vacuum gauge. The heated gauge
tube supplies an analog signal that is amplified for a zero to one volt signal out put. A precision A/D
converter, in conjunction with a microprocessor, measures the gauge tube’s signal output, converts the
measurement to a pressure reading using the gauge tube’s well defined output/pressure function, and then
provides the result to the end user through a serial communications port.
The DAVC is available for use with two of THI’s most popular gauge tube families: The DV-6 and DV-4.
The DV-6 range is 1.0 - 1000 mTorr. The DV-4 range is 0.2 - 20 Torr. All gauge-tubes used with the Digital
AVC feature long life and minimal maintenance due to the use of rugged, noble-metal, thermocouple (TC)
gauge tubes that are designed specifically for each range.
1.2 Specifications
Input Power............................................................................................................................ 12 – 30 VDC
.................................................................................................................................................... 0.7 Watts
Cable.............................................................Combination power and RS232 cable, 1.5 meters, included
..................................................................... For CE Compliance, cable should never exceed 3.0 meters
Weight (Approx.) ....................................................................... 22 Oz’s (624 Grams) W/O Tube & Cable
Height (Length) .................................................................................................... 2.6”, W/O Tube & Cable
Width / Depth .................................................................................................................................... 1.75”
Operating temperature Range ............................................................................................ -20°C to 70°C
Standard Metal Gauge Tube.............................................................................. (DV-6R, DV-5M, DV-4R):
Overpressure (Gauge tubes) ................................................................................................. 50 psig max.
Material of Construction ................................................................................... DAVC Housing: Aluminum
............................................................................................................ Thermocouple: Glass, Noble Metal
Connections .........................................................................................High Density, 15-Pin, D Connector
.........................................................................................................Octal Tube Socket for Thermocouple
Alarms..............................................................................................................................0.50 Amps, max.
Tube Leak Test .......................................................................................................<1x10
-8
atm cc/sec He
See tube Product Bulletin for available tube connection configurations.
1.0 General Information