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Summary of Contents for Teledyne DAVC-4
- Page 1 Digital AVC (DAVC-4, DAVC-5, DAVC-6) INSTRUCTION MANUAL I S O 9 0 0 1 C E R T I F I E D...
- Page 2 Revision H (Document Number 174-052016)............... May 2016 Revision J (Document Number 174-012021) ..............January 2021 Visit www.teledyne-hi.com for WEEE disposal guidance. Hastings Instruments reserves the right to change or modify the design of its equipment without any obligation to provide notification of change or intent to change.
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Page 3: Table Of Contents
Table of Contents GENERAL INFORMATION ............................4 ...............................4 EATURES ..............................4 AFETY ..........................4 OMPLIANCE ............................5 PECIFICATIONS ..........................5 HERMAL OEFFICIENT ............................6 CCESSORIES INSTALLATION ................................9 -I/O C ..........................9 OWER ABLE & P ......................9 OWER EQUIREMENTS .......................9 ERIAL OMMUNICATIONS ........................9 INEAR UTPUT ......................9 INEAR UTPUT .........................10... -
Page 4: General Information
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. -
Page 5: Specifications
1.4 Specifications Input Power ..........................11 – 32 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.) ................0.27 lbs (123 Grams) W/O Tube & Cable Height (Length) ...................... -
Page 6: Accessories
Reference Tubes for use with DAVC 55-104 DB-20 Ref Tube (DV-6) for DAVC-6 Calibration 55-101 DB-16D Ref Tube (DV-4D) for DAVC-4 Calibration 55-103 DB-18 Ref Tube (DV-5) for DAVC-5 Calibration Page 6 of 23 174-012021_Digital AVC... - Page 7 1.6.4 Tube Types and Cables Extension Cables for VT Series (DAVC) 55-3 OM-8-OFV 8 Ft Extension Cable 55-22 OM-12-OFV 12 Ft Extension Cable 65-53 OM-25-OFV 25 Ft Extension Cable 65-102 OM-50-OFV 50 Ft Extension Cable 55-142 OM-100-OFV 100 Ft Extension Cable Vacuum Gauge Tubes 1000 mTorr Range Stock # Model # Description...
- Page 8 1.6.5 Outline Drawing Page 8 of 23 174-012021_Digital AVC...
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Page 9: Installation
2.0 Installation 2.1 Power-I/O Cable The Power-I/O Cable is assembled at the factory as shown in Fig. 1. Its terminal end is finished with stripped wire ends each tinned with lead free solder. This configuration is consistent with the previous, analog version of the AVC and its color-coded wire assignment remains the same, as much as possible, considering the additional features of the Digital version. -
Page 10: Pressure Alarms Pin Out
2.6 Pressure Alarms Pin Out A single pressure set point controls two open collector circuits. Alarm 1, the over-pressure condition is available through pin 1 (gray) and Alarm 2, the under-pressure condition available through pin 2 (brown). The open-collector circuits will need to be supplied with power and current limiting resistance by the end user. -
Page 11: Vacuum Gauge Operation
3.0 Vacuum Gauge Operation All THI gauge tubes are shipped with a protective cap or cover at the evacuation port to reduce contamination and prevent damage to the internal thermopile elements. Once the protective cap or cover is removed, a tube can be installed in any convenient position in the vacuum system without adversely affecting calibration or performance. -
Page 12: Non-Linear Analog Pressure Measurement
Analog Output vs. Pressure graph below. The minimum detectable pressure is 0.1 millitorr for DAVC-5, 1 millitorr for DAVC-6 and 20 millitorr for DAVC-4. The voltage signal, illustrated in the Analog Output vs. Pressure graph below, can be mapped to a pressure value by using the following equation. - Page 13 Analog Output vs Pressure DAVC6 DAVC4 DAVC4-1.2V DAVC5 0.01 0.001 0.0001 Voltage Page 13 of 23 174-012021_Digital AVC...
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Page 14: Linear Analog Pressure Measurement
3.4 Linear Analog Pressure Measurement A second analog signal output line, pin 11 (red), supplies one of five different ranges of linear signals corresponding to the output range of the selected tube. This signal should be measured with respect to the Analog Signal Common line, pin 6 (violet). - Page 15 The 4-20mA value can be mapped to a milliamp signal by using the following equation. − SPAN Where: I = current in milliamps, P = pressure in Torr for DV-4, mTorr for DV-5, DV-6, and DV-33, = max pressure range (20 Torr, 100 mTorr, 1000 mTorr), = span value in milliamps (example: 20 for 0-20 mA, 16 for 4-20 mA), SPAN...
- Page 16 Page 16 of 23 174-012021_Digital AVC...
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Page 17: Alarm Set Point
3.5 Alarm Set point A single set point controls two open collector circuits. Though not mechanical relays, the two circuits called Alarm 1 (P > SP) and Alarm 2 (P < SP) allow physical monitoring of the state of the vacuum with respect to the set point. Alarm 1 (P ˃... -
Page 18: Digital Communications
3.6 Digital Communications See the section on Serial Communications Pin Out for wiring instructions. RS-232 communication may be established with baud rates of 9600 or 19200 only. The communication parameters of the DAVC are fixed at 8 data bits, 1 stop bit, no parity and no handshaking. The command set can be found in the table below. - Page 19 3.6.3 Parameter Modification Commands Command Description Format Response notes: Select 0-20 mA Linear Output D0<CR> Select 1 Volt Linear Output D1<CR> Select 4–20 mA Linear Output D4<CR> Select 5 Volt Linear Output D5<CR> Select 10 Volt Linear Output D10<CR> Select A/D input 0 A0<CR>...
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Page 20: Operation And Performance
3.6.4 Reset / Initialize Commands Command Description Format Notes: Software Reset /<CR> Reset instrument Does not reset or overwrite any parameters saved in non-volatile memory (EEPROM). Autobaud <ctrl-z><CR> Match baud rate currently in use Device can run at 9600 or 19200 Baud. Set terminal to 9600/N/8/1 or 19200/N/8/1 and type Ctrl-Z. The <ctrl-z>... -
Page 21: Calibration Procedure
3.9 Calibration Procedure NOTE: ONCE CALIBRATION IS COMPLETE THE CALIBRATION DATA IS PERMANENTLY STORED IN NON-VOLATILE MEMORY. A LOSS OF POWER WILL NOT ERASE THE CALIBRATION DATA. TO ERASE THE CALIBRATION DATA, REFER TO STEP 4. 3.9.1 Preparation 1. The following procedures can be carried out on a unit installed in a vacuum system as long as a calibrated reference meter is installed in the same system in close proximity to the unit being calibrated. - Page 22 tweak the DAC span voltage, first send the DS<CR> command and record the returned value. Use the command DS={m.dd}E{+e}<CR> to alter this value until 10.000 volts is achieved. After achieving a close approximation to the selected span value, send the DSW<CR> command to lock in any changes.
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Page 23: Warranty
If you then choose not to have the product repaired, a minimum will be charged to cover the processing and inspection. Please consult the factory for your RMA number before returning any product repair. TELEDYNE HASTINGS INSTRUMENTS 804 NEWCOMBE AVENUE HAMPTON, VIRGINIA 23669 U.S.A.
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