174-012021_Digital AVC Page 4 of 23
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, non-linear signal that is amplified for a zero to one-volt signal output. 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. In addition, the same
signal is converted to a linear analog output that is range selectable by the user.
The DAVC is available for use with three of THI’s most popular gauge tube families: The DV-6, DV-5, and
DV-4. The DV-6 range is 1.0 - 1000 mTorr. The DV-5 range is 0.1 – 100 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 Safety
The following symbols and terms may be found on THI products and/or in THI manuals and indicate
important information.
When found on the device, this symbol indicates that the operator should refer to the manual
for important instructions on the proper use of this device. When found in a manual, this symbol
indicates that the reader should understand the implications contained in the text before
operating the device.
The WARNING label indicates important information that should be heeded for safe and proper
performance of the device.
The label, CAUTION, is used to indicate that damage to the power supply or equipment connected to it,
could occur if directions are not followed. Warranty could be invalidated if the instructions in this manual
are not followed.
1.3 Compliance Data
CE Standard Compliance
Test Standard
SAFETY EN61010
EMC/EMI Family EN61326
CONDUCTED/RADIATED EN55011
ESD EN61000-4-2
RF EN61000-4-3
CONDUCTED IMMUNITY EN61000-4-6
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