gohastings com Hastings Entertainment Cable Box DAVC 4 User Manual

TELEDYNE  
HASTINGS  
INSTRUMENTS  
INSTRUCTION MANUAL  
DIGITAL AVC  
(DAVC-4, DAVC-5, DAVC-6)  
I S O 9 0 0 1  
C E R T I F I E D  
Table of Contents  
1.0  
1.1  
GENERAL INFORMATION............................................................................................................................ 4  
FEATURES ....................................................................................................................................................... 4  
SPECIFICATIONS ............................................................................................................................................. 4  
COMPLIANCE DATA ........................................................................................................................................ 5  
SAFETY ........................................................................................................................................................... 5  
1.2  
1.3  
1.4  
ACCESSORIES ............................................................................................................................................................... 5  
2.0  
INSTALLATION............................................................................................................................................... 7  
2.1  
2.2  
2.3  
2.4  
2.5  
POWER-I/O CABLE.......................................................................................................................................... 7  
POWER REQUIREMENTS & PIN OUT............................................................................................................... 7  
SERIAL COMMUNICATIONS PIN OUT............................................................................................................. 7  
ANALOG OUTPUT PIN OUT............................................................................................................................ 7  
PRESSURE ALARMS PIN OUT.......................................................................................................................... 7  
3.0  
VACUUM GAUGE OPERATION.................................................................................................................... 9  
3.1  
3.2  
3.3  
3.4  
3.5  
3.6  
3.7  
QUICK START ................................................................................................................................................. 9  
ANALOG PRESSURE MEASUREMENT .............................................................................................................. 9  
ALARM SET POINT........................................................................................................................................ 12  
DIGITAL COMMUNICATIONS. ...................................................................................................................... 12  
OPERATION AND PERFORMANCE ................................................................................................................. 14  
GAUGE TUBE OPERATING PRINCIPLE.......................................................................................................... 15  
CALIBRATION PROCEDURE .......................................................................................................................... 15  
4.0  
WARRANTY.................................................................................................................................................... 17  
4.1  
4.2  
WARRANTY REPAIR POLICY......................................................................................................................... 17  
NON-WARRANTY REPAIR POLICY................................................................................................................ 17  
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1.0 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.  
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.  
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1.3 Compliance data  
CE Standard Compliance  
Test  
Standard  
SAFETY  
EN61010  
EN61326  
EMC/EMI Family  
CONDUCTED/RADIATED  
EN55011  
ESD  
EN61000-4-2  
EN61000-4-3  
EN61000-4-6  
RF  
CONDUCTED IMMUNITY  
1.4 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.  
Accessories  
1.4.1 Installation Accessories  
THI offers a complete line of system attachments that  
permit easy maintenance for contaminated operations.  
Gauge tubes are offered with various system fittings to  
match almost any system requirement. Additionally,  
THIs complete line of quick disconnect attachments  
allows customers to install these special fittings and  
easily replace sensors without vacuum sealant or  
Teflon® tape. For particularly dirty systems, Hastings  
offers a particle dropout trap containing a series of nine  
separate baffles which prevent solid contaminants from  
having a direct path to the sensor’s thermopile.  
1.4.2 DV-6S: New DV-6 tube For Severe  
Environments  
Hastings Instruments has developed a new gauge tube, the DV-6S, which is specifically designed for  
outdoor use on cryogenic tanks including railcar and tanker truck applications. In addition to the DAVC, the  
gauge tube is compatible with the hand-held HPM-4/6 and the analog VT-6.  
The DV-6S is supplied with a protective cap. The o-ring-sealed cap protects the gauge tube pins from  
moisture thus significantly reducing corrosion. A metal lanyard prevents cap loss. The tube is provided with  
a standard 1/8” NPT fitting; however special fitting requests can often be met.  
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1.4.3 Calibration Reference  
Tubes  
Vacuum Gauge Tubes 1000 mTorr Range  
Stock # Model # Description  
THI Reference Tubes employ the  
same metal thermopiles used in all  
THI Vacuum Gauge Tubes. The  
thermopile is sealed in a glass  
capsule that has been evacuated,  
baked, out-gassed, and then aged to  
ensure long-term stability. The sealed  
capsule is then housed in a protective  
metal shell to provide a rugged,  
trouble-free assembly.  
55-38  
DV-6M  
DV-6R  
DV-6  
1/8” NPT Standard (Yellow base)  
1/8” Ruggedized  
55-38R  
55-38RS  
1/8” NPT Rohs Rugged  
55-38S  
55-251  
DV-6S  
1/8” NPT Rugged/Vibration  
KF-16TM  
KF-25TM  
VCRTM  
Mini ConflatTM  
DV-6-KF-16  
DV-6-KF-25  
DV-6-VCR  
DV-6R-CF  
55-267  
55-283  
Once assembled, the reference  
gauge tube is accurately calibrated to  
precisely simulate a gauge tube at a  
given operating pressure. It provides  
quick and easy instrument re-  
calibration by merely plugging the  
instrument and, in the case of the  
DAVC, adjusting the HTR  
55-38R-CF  
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  
potentiometer until the display reads  
the exact pressure noted on the  
reference tube.  
Vacuum Gauge Tubes 20Torr Range  
55-19  
DV-4D  
DV-4R  
DV-4D-KF-16 KF-16TM  
DV-4D-KF-25 KF-25TM  
1/8” NPT (Purple Base)  
1/8” NPT Ruggedized  
55-19R  
55-258  
55-266  
55-227  
DV-4D-VCR  
VCRTM  
Vacuum Gauge Tubes 100 mTorr Range  
55-19  
DV-5M  
1/8” NPT (Red Base)  
55-230  
DV-5M -VCR VCRTM  
Reference Tubes for use with DAVC  
55-104  
55-101  
55-103  
DB-20  
DB-16D  
DB-18  
Ref Tube (DV-6) for DAVC-6 Calibration  
Ref Tube (DV-4D) for DAVC-4 Calibration  
Ref Tube (DV-5) for DAVC-5 Calibration  
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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.  
Fig 1  
2.2 Power Requirements & Pin Out  
Supply the DAVC with a well regulated, 12 to 30 VDC power source capable of providing at least 0.5.  
Watts between Power pin 4 (blue/-) and Power Common pin 3 (green/+). See Fig. 1.  
2.3 Serial Communications Pin Out  
The transmit line of the DAVC, RS232 TX pin 15 (pink), must be connected to the receive pin of the serial  
connector on the computer and the receive line, RS232 RX pin 14 (tan) must be connected to the transmit  
pin of the serial connector on the computer. A third line, Digital Common, pin 8 (black), should join the  
common pins on both the computer and the DAVC.  
RS-232 communication may be established with baud rates of 9600 or 19200 only. The communication  
conditions of the DAVC are fixed at 8 data bits, 1 stop bit, no parity and no handshaking. See the SERIAL  
COMMUNICATIONS subsection under OPERATION for the command set.  
2.4 Analog Output Pin Out  
An analog Pressure Signal output line, pin 7 (yellow) supplies a 0 to 1 VDC signal corresponding to the  
output range of the selected tube. This signal should be measured with respect to the Analog Signal  
Common at pin 6 (violet).  
2.5 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. The suggested circuit configuration is illustrated in Figure 2. The open collector circuits are limited to  
the Voltage limitations of the DAVC and the maximum continuous current should be limited to no more than  
0.5 amps to avoid damage to the DAVC.  
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ALARM 1  
DIGITAL COMMON  
ALARM 2  
+VDC  
POWER COMMON  
DIGITAL COMMON  
DIGITAL COMMON  
Fig. 2  
Relay Hook Up  
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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. The recommended orientation is with the tube vertical and its stem  
down. This will aide in preventing condensable materials from remaining in the gauge tube.  
3.1 Quick Start  
1. Install the appropriate DV4, DV5 or DV6 gauge tube (See the bottom of the instrument to determine  
the appropriate tube) into the vacuum system. When installing the gage tube, consider the position  
of the keyed octal plug so that the LEDs and controls on the DAVC will be readily accessible  
2. Plug the gauge tube into the octal socket on the bottom of the Digital AVC.  
3. Connect power common (-) to the blue wire (pin 4) and from +12 VDC to +30 VDC supply to the  
green wire (pin 3). One of the LED's indicating over-pressure or under-pressure on the top of the  
DAVC will illuminate.  
4. While at one atmosphere, press the ATM button and release to set the atmosphere tube output for  
this individual tube. The LEDS will flash while the button is pressed. Holding the button longer than  
3 seconds will reset the adjustment back to the default value.  
5. The low pressure accuracy can be improved if the vacuum chamber can be pumped down below the  
minimum pressure range of the attached tube can be reached, adjust the HTR potentiometer until  
that pressure reading is reported (See the serial communication section) or until the analog Pressure  
Signal Output, pin 7 (yellow) equals approximately 1.0 Volts. Refer to Section 3.7 for more  
information about tube calibration.  
3.2 Analog Pressure Measurement  
An analog Pressure Signal Output line, pin 7 (yellow), supplies a 0 to 1 VDC signal 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). See the INSTALLATION section for a diagram showing the Analog Signal pin  
out.  
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This signal is equal to an amplified tube millivolt signal. This signal will NOT be linearly proportional to  
the indicated pressure. 1 volt (1.2 for DAVC4-1.2V) will correspond to a system pressure that is at least 1  
order of magnitude less than the minimum detectable pressure. Increasing pressure will be indicated by a  
decreasing voltage. The minimum detectable pressure is 0.2 millitorr for DAVC-5, 1 millitorr for DAVC-6  
and 20 millitorr for DAVC-4.  
The voltage signal can be mapped to a pressure value by using the following equation.  
a + cV + eV 2  
1+ bV + dV 2  
P =  
Where:  
V = Voltage  
P = pressure in Torr for DV4 & DV5 versions and millitorr for DV6  
DV5  
DAVC-4-1.2V  
Parameters DV6  
DV4  
a
b
c
d
e
-1623.22 -5.10184  
-58.0442 -6.91233  
-3.8115614  
-2.5905928  
-26.238798  
-22.881611  
24.483441  
-0.25948  
-42.23869  
-2.92598  
-256.99510  
3.18016  
-11732.2  
-4.4943  
-130.397 -6.30995  
13338.17 9.563177  
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Analog Output vs Pressure  
100  
10  
DAVC6  
DAVC4  
DAVC4-1.2V  
DAVC5  
1
0.1  
0.01  
0.001  
0.0001  
0
0.2  
0.4  
0.6  
0.8  
1
1.2  
Voltage  
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3.3 Alarm Set point  
A single set point controls two open collector circuits. Though not the 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 > SP), pin #1 (gray), is active when the red LED is ‘ON’ indicating that the pressure is  
above the set point.  
Alarm 2 (P < SP), Pin #2 (brown), is active when the green LED is ‘ON’ indicating that the pressure is  
below the set point.  
The open-collector circuits need to be supplied with their own power and current limiting resistance by the  
end user. The load, controlled by the Open-Collector circuits, must not require voltages higher than those  
specified for the DAVC (12 – 30 VDC) AND must not exceed 500 mAmps of continuous current. See the  
section on Pressure Alarms Pin Out for wiring instructions.  
The alarm set point may be set in one of two ways:  
One, by the measuring the Voltage signal between Analog Signal Common, Pin #6 (violet) and  
Setpoint Level, Pin #5 (white) and setting the voltage using the SP potentiometer until the voltage  
corresponds to the pressure indicated on one of the Pressure Vs. Voltage charts above.  
Two, by using the A2 command to send the set point voltage to the A/D converter in conjunction with  
a P1 command to enable streaming while the pot is set to the desired trigger pressure. Remember to  
disable streaming by issuing a P0 command and reset the signal source of the A/D converter by  
issuing an A0 command.  
While the SP potentiometer is enabled using the PE command, the value of the set point is read every  
thirty seconds and compared to its previous setting. If the setting has changed, the new setting will be  
stored to non-volatile memory. If the SP potentiometer is disabled using the PD command, then no  
tweaking of the SP potentiometer will have any affect.  
In either Enabled (PE) or Disabled (PD) cases, using the S1=#.## command will re-write a new set point.  
Only if the Potentiometer is Enabled using the PE command, will adjustment of the potentiometer affect a  
previous set point.  
3.4 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.  
Communication with the serial interface of the Digital AVC is via an ASCII data string. The command  
message consists only of a command string and the terminator. If all components of the ASCII data string  
are valid the command will be accepted and executed.  
3.4.1 Command Syntax.  
In the following examples of syntax codes, the special characters are explained:  
The first characters in each row of the format column represent a command string, either upper or lower  
case command characters accepted. All characters must follow each other in the string with no spaces  
or other characters.  
The characters within wavy brackets { } contain choices for the appropriate command.  
The characters within the symbols < > are the common abbreviations for the one digit ASCII control  
codes which they represent, (e.g. <CR> represents carriage return).  
All command strings must be followed by the terminator character (carriage return <CR>, also known as  
ENTER).  
When a lower case character is present in an example it represents an option.  
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Character  
Description  
Valid Inputs:  
1 - 9  
m
d
Most Significant Digit Of Mantissa  
Decimal Digit  
0 - 9  
e
Exponent  
0 - 5  
<CR> Command Terminator (carriage return)  
N/A  
3.4.2 Interrogation Commands.  
Command Description  
Format  
ID<CR>  
P<CR>  
Sample Response  
Get Device ID  
Digital AVC<CR>  
Get Current Pressure if A0 is set, current Set Point  
if A2 is set, heater potentiometer setting if A3 is set  
Pa: 1.23456e+0 Torr<CR>  
Get Relay Status  
RS<CR>  
S1<CR>  
SN<CR>  
ST<CR>  
U<CR>  
1,R1:ON<CR>  
Get Setpoint  
SP1: 1.0240e-2 mbar<CR>  
1023400012<CR>  
DV-6<CR>  
Get Serial Number (10 character max)  
Get Sensor Type  
Get Raw Average Output Voltage – No Offset.  
Get User Data (10 character max)  
Get Software Version #  
Vavg: 1.23456e-1 Volts<CR>  
TextString<CR>  
UD<CR>  
V<CR>  
Digital CVT 1.1.0 <CR>  
3.4.3 Parameter Modification Commands  
Command Description  
Select A/D input 0  
Select A/D input 1  
Select A/D input 2  
Format  
A0<CR>  
A1<CR>  
A2<CR>  
Response  
none  
notes:  
Read from gauge tube  
Read from Setpoint Potentiometer  
Read heater adjust potentiometer  
Stops streaming output  
none  
none  
Data streaming/Logging Off  
Data streaming/Logging On  
P0<CR>  
P1<CR>  
none  
See P cmd  
(Reports signal Voltage and  
pressure in Torr only)  
Disable set-point pot.  
Enable set-point pot.  
Modify Setpoint  
Set units to Torr  
Set units to Pascal  
Set units to Mbar  
Modify User Data  
Notes:  
PD<CR>  
PE<CR>  
OK  
OK  
Lock out local setpoint adjustment  
Enable local setpoint adjustment  
1.00000e-9 to 9.99999e+9  
All subsequent values in Torr  
All subsequent values in Pascal  
All subsequent values in mbar  
10 character maximum  
S1={m.dd}E{+e}<CR> OK  
U1<CR>  
OK  
OK  
OK  
U2<CR>  
U3<CR>  
UD=TextString<CR>  
The User Data is 10 digit text area reserved for use by the customer for identification purposes.  
The setpoints may also be entered as a decimal number, e.g. [S1=0.760<CR>] will be same as entering  
[H=7.60E-1<CR>] .  
When inputting setpoint data, it should be entered in the same Units of Pressure as the presently selected  
Units of Measurement (i.e. Torr, mbar or Pascal). The data is only checked to be a valid number with a one  
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digit exponent before being accepted. There are no limit checks on the data; the user is free to choose any  
value appropriate to his use of the instrument.  
If the command syntax is not met or if the number is out or range, the Digital AVC will respond with the  
ASCII codes for <bell>?<CR>, and the command will be ignored.  
3.4.4 Reset / Initialize Commands  
Command Description Format  
Software Reset  
Notes:  
/<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> is entered by holding down the “Ctrl” key while pressing the “z” key when using terminal  
emulator program. This character has an ascii code of 26 (decimal) and 1A (hexadecimal).  
Device will respond with Device ID (Digital AVC). If this response is not generated, repeat the Ctrl-Z until it  
is. The Baud rate will be stored in EEPROM and is remembered on the next power-up.  
3.5 Operation and Performance  
The Digital AVC will function right “out of the box”. For maximum accuracy refer to the Calibration section  
below and perform the calibration procedure.  
The simplest and quickest way of checking the operation and performance of a gauge and/or gauge tube,  
is to keep a new or known-good gauge tube on hand for use as a reference.  
To check operation, install both the reference and suspect gauge tubes in a common vacuum system  
(locate the gauge tubes as close as possible to each other), then evacuate the system until a stable base  
pressure is obtained. Alternately connect the vacuum gauge to each gauge tube and record its pressure  
readings. If the gauge tube-under-test produces a significantly higher pressure reading than the reference  
gauge tube, this indicates a calibration shift and is usually the result of contamination (particulate, oil, or  
other chemical deposits). You can try to restore calibration of the contaminated gauge tube by cleaning it  
internally with an appropriate solvent such as high-purity isopropyl alcohol (flood the interior cavity of gauge  
tube gently with solvent and allow it to stand and soak for about 15 to 30-minutes). Drain the contaminated  
solvent and let gauge tube dry in ambient air until all of the cleaning solvent has evaporated. To prevent  
mechanical damage to the thermopile elements, do not use forced air to dry the gauge tube. Gauge tubes  
that remain out of calibration after cleaning should be replaced.  
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3.6 Gauge Tube Operating Principle  
Operation of the Hastings gauge tube is based on a low voltage AC bridge that heats a noble metal  
thermopile. A change in pressure in the gauge tube changes the molecular collision rate and therefore the  
thermal conduction of the gas or gas mixture surrounding the thermopile. This results in a temperature shift  
in the AC heated thermocouples A and B (Fig. 6). The resultant temperature shift causes a change in the  
DC output from couples A and B inversely with pressure changes. The DC thermocouple C (when installed)  
is in series with the circuit load. Thermocouple C provides compensation for transient changes in ambient  
temperature.  
3.7 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 2.  
3.7.1 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.  
2. The following procedure assumes that the appropriate DV4, DV5 or DV6 gauge tube (See the  
bottom of the instrument to determine the appropriate tube) corresponding to the set up of the DAVC  
is connected to the unit.  
3. Power the DAVC with a DC supply capable of providing from 12 to 30 Volts DC and at least 0.5  
Amps.  
4. Using a pointed object, such as a ballpoint pen, press and hold the “ATM” push button located on  
the top cover until the two LEDS are on continuously (approximately 3 seconds). This deletes any  
previously stored data.  
3.7.2 Set High End  
NOTE: TUBE MUST BE AT ATMOSPHERE TO PROPERLY SET THE HIGH END.  
While at one atmosphere, press the ATM button and release to set the atmosphere tube output for this  
individual tube. The LEDS will flash while the button is pressed. Push the button only as long as it takes  
the LED’s to blink one or twice. Holding the button longer than 3 seconds will reset the adjustment back to  
the default value. The high-end setting is now set.  
3.7.3 Set Low End W/Vacuum System  
NOTE: The LOW END can be adjusted by either bringing the system to a known vacuum or by using a  
HASTINGS REFERENCE TUBE (see below).  
A. Set system to known vacuum.  
B. Turn the HTR potentiometer on the top panel until the either the voltage measured between pins 6,  
Analog Signal Common (violet) and 7, Pressure Signal Output (yellow) reads the voltage  
corresponding to the pressure as read on the Pressure Vs. Voltage chart for the tube being  
measured or, if using serial communication, until the proper pressure is read while using the  
streaming P1 command.  
C. The low end is now adjusted.  
3.7.4 Set Low End W/Reference Tube.  
A. Connect the THI reference tube.  
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B. Turn the HTR potentiometer on the top panel until the either the voltage measured between pins 6,  
Analog Signal Common (violet) and 7, Pressure Signal Output (yellow) reads the voltage  
corresponding to the pressure as read on the Pressure Vs. Voltage chart for the tube being  
measured or, if using serial communication, until the proper pressure is read while using the  
streaming P1 command.  
C. THE LOW END is now adjusted.  
NOTE: If re-calibration is required you must repeat the High End adjustment first.  
The following table specifies the THI reference tube to be used in the calibration of a gauge based upon  
the type of gauge tube being used.  
Ref. Tube  
Gauge Tube  
DB-16D  
DB-18  
DB-20  
DV-4  
DV-5  
DV-6  
174-082010_Digital AVC  
Page 16 of 17  
4.0 Warranty  
4.1 Warranty Repair Policy  
Hastings Instruments warrants this product for a period of one year from the date of shipment to be free  
from defects in material and workmanship. This warranty does not apply to defects or failures resulting from  
unauthorized modification, misuse or mishandling of the product. This warranty does not apply to batteries  
or other expendable parts, nor to damage caused by leaking batteries or any similar occurrence. This  
warranty does not apply to any instrument which has had a tamper seal removed or broken.  
This warranty is in lieu of all other warranties, expressed or implied, including any implied warranty as to  
fitness for a particular use. Hastings Instruments shall not be liable for any indirect or consequential  
damages.  
Hastings Instruments, will, at its option, repair, replace or refund the selling price of the product if Hastings  
Instruments determines, in good faith, that it is defective in materials or workmanship during the warranty  
period. Defective instruments should be returned to Hastings Instruments, shipment prepaid, together  
with a written statement of the problem and a Return Material Authorization (RMA) number. Please consult  
the factory for your RMA number before returning any product for repair. Collect freight will not be  
accepted.  
4.2 Non-Warranty Repair Policy  
Any product returned for a non-warranty repair must be accompanied by a purchase order, RMA form and  
a written description of the problem with the instrument. If the repair cost is higher, you will be contacted for  
authorization before we proceed with any repairs. 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.  
ATTENTION: REPAIR DEPARTMENT  
TELEPHONE  
(757) 723-6531  
1-800-950-2468  
FAX  
(757) 723-3925  
E MAIL  
INTERNET ADDRESS  
Repair Forms may be obtained from the “Information Desk” section of the Hastings Instruments web site.  
174-082010_Digital AVC  
Page 17 of 17  

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