Guildline 6622T Series Operation Manual
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Guildline 6622T Series Operation Manual

Automatic dcc thermometry bridges
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Operation Manual
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6622T Series
Automatic DCC Thermometry Bridges
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NOTICE
The contents and information contained in this manual are proprietary to
Guildline Instruments Limited. They are to be used only as a guide to the
operation and maintenance of the equipment with which this manual was
issued and may not be duplicated or transmitted by any means, either in whole
or in part, without the written permission of Guildline Instruments Limited.
OM6622T-A-00
30 January 2018

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  • Page 1 NOTICE The contents and information contained in this manual are proprietary to Guildline Instruments Limited. They are to be used only as a guide to the operation and maintenance of the equipment with which this manual was issued and may not be duplicated or transmitted by any means, either in whole or in part, without the written permission of Guildline Instruments Limited.

  • Page 3: Table Of Contents

    Setup And Power On ............................2-3 2.2. INCOMING INSPECTION ..........................2-3 2.3. 6622T SERIES FRONT PANEL DISPLAY AND CONTROLS ..............2-5 2.3.1. Standard Resistor Input Terminals (Bench Model Only) ................2-5 2.3.2. Resistor Under Test Input Terminals (Bench Model Only) ................2-6 2.3.3.
  • Page 4 3.1.2. Low Ohm Mode Resistance Measurement (All 6622T Models) ..............3-5 3.1.3. Thermometry Measurement Mode ......................3-10 3.2. BRIDGEWORKS DATA ACQUISITION SOFTWARE ................. 3-12 INSTRUMENT OPERATION ..................4-1 4.1. FRONT PANEL OPERATING PROCEDURE ................... 4-1 4.2. 6622T THERMOMETRY MEASUREMENT BRIDGE ................4-1 4.3.
  • Page 5 4.6.7.7. <Sys Time>MENU Fn-2 (Sofcal MAIN) ..................4-35 4.6.7.8. <Extender>MENU Fn-3 (SofcalMENU) ..................4-35 4.6.6.9 PASSWORD> MENU Fn-1 (Sofcal_MAIN) ................... 4-40 VERIFICATION AND CALIBRATION ..............5-1 5.1. RESISTANCE RATIO ACCURACY VERIFICATION ................5-1 5.1.1. Purpose ................................5-1 5.1.2. Equipment Required ............................5-1 5.1.3.
  • Page 6 7.5. MODEL 6622T PROGRAMMING COMMAND SUMMARY ..............7-8 APPENDICES ......................8-1 8.1. GENERAL SPECIFICATIONS (continued) ....................8-1 8.2. RESISTANCE MEASUREMENT SPECIFICATION ................8-2 OM6622T-A-00 30 January 2018...
  • Page 7 LIST OF FIGURES FIGURE 1-1 : MODEL 6622T BLOCK DIAGRAM ...................... 1-4 FIGURE 2-1 : LINE VOLTAGE SELECTOR ......................... 2-2 FIGURE 2-2 : 6622T FRONT VIEW (BENCH / RACK) ....................2-5 FIGURE 2-3 : 6622T REAR VIEW (BENCH / RACK) ....................2-8 FIGURE 3-1 : RESISTANCE MEASUREMENT RESPONSE VERSUS TEST SAMPLE .........
  • Page 8 OM6622T-A-00 30 January 2018...
  • Page 9 LIST OF TABLES TABLE 2-1 : FUSE RATINGS ............................2-2 TABLE 3-1 : RECOMMENDED NORMAL OHM MODE TEST SETUPS ..............3-4 TABLE 3-2 : 6623 RECOMMENDED LOW OHM MODE TEST SETUP ..............3-7 TABLE 3-3 : 6623A-300 RECOMMENDED LOW OHM MODE TEST SETUP ............3-7 TABLE 3-4 : RECOMMENDED TEMPERATURE MEASUREMENT TEST SETUP ..........
  • Page 10 OM6622T-A-00 30 January 2018...

  • Page 11: Introduction

    1.2. GENERAL DESCRIPTION The 6622T series bridges can be controlled from the front panel or by a computer system through software. The BridgeWorks Software Users Manual describes the operation of the 6622T with the software. Once the computer system is installed and connected to the IEEE-488 Interface of the 6622T Thermometry Bridge, full software control of the bridge is possible.

  • Page 12: Overview

    The bridge is designed for flexibility and ease of use and is based on the manually operated direct- current-comparator bridge manufactured by Guildline Instruments (model 9975) and also on the original work of the National Research Council of Canada .

  • Page 13: Principle Of Operation

    Section 1 1.4. PRINCIPLE OF OPERATION A simplified diagram of the automatic direct-current-comparator is shown in Figure 1-1. Two sets of four terminal connections hardware are provided, one set for the standard resistor and one set for the unknown resistance. A current (Ix), set under control of the microprocessor, is passed through the variable turns of winding (Nx) of the comparator and through the unknown resistance (Rx).

  • Page 14: Figure 1-1 : Model 6622T Block Diagram

    Section 1 5 Mb/s SYNCHRONOUS KEYPAD 6622T SERIAL INTERFACE EACH MESSAGE IS 22 BYTES CONTROLLER/ COMMUNICATION 6622T DISPLAY GPIB FIBRE OPTIC FIBRE OPTIC INTERFACE INTERFACE MAGNETIC MODULATOR AND FLUX DETECTOR ASYNCHRNOUS SERIAL FIBRE OPTIC ISOLATION Rx Tx -AUTORANGING -HIGH INPUT IMPEDANCE Nx=0 to 8747 Ns=648...

  • Page 15: Low Ohm Measurement Mode

    Section 1 1.4.1.1. Low Ohm Measurement Mode This mode can be used to make 4 terminal resistance measurements down to 0.1  against a 1 . In Low Ohm mode a high current range extender such as the model 6623A is used to improve the accuracy and allow for measurements below the normal Ohm range.
  • Page 16 Section 1 OM6622T-A-00 30 January 2018...

  • Page 17: Installation

    Section 2 INSTALLATION 2.1. PRELIMINARIES 2.1.1. Unpacking a. Remove the 6622T Automatic DCC Thermometry Bridge and the other items from its shipping container in a suitable location. b. The following items are included with each new bridge Operators Manual (OM6622T) Software Users Manual (SUM66XX) iii.

  • Page 18: Fuse Replacement

    Section 2 2.1.3. Fuse Replacement Only fuses with specified current rating type should be used for replacement if necessary. See Table 2-1. FUSES (TIME DELAY TYPE) 100 V 120 V 220 V 240 V 2 A, 250 V, (T) 2 A, 250 V, (T) 1 A, 250 V, (T) 1 A, 250 V, (T) Table 2-1 : Fuse Ratings...

  • Page 19: Setup And Power On

    Section 2 2.1.4. Setup And Power On a. Verify that the power switch is off. b. Remove any excess packing material from around the front panel that is provided for shipping purposes only. c. Connect the computer system as applicable in accordance with the documentation provided.
  • Page 20 Section 2 Select the down arrow key to highlight the next line on the display. Enter in 15 for the reversal rate for the measurement. Select the down arrow key to highlight the next line on the display. Enter 1 mA test current value for the test Select the down arrow key to highlight the next line on the display.

  • Page 21: 6622T Series Front Panel Display And Controls

    Section 2 2.3. 6622T SERIES FRONT PANEL DISPLAY AND CONTROLS The displayed text for each control of the 6622T Series represents the current applicable state of the bridge. Figure 2-2 : 6622T Front View (Bench / Rack) 2.3.1. Standard Resistor Input Terminals (Bench Model Only) The standard resistor input terminals consist of 4 low thermal binding posts.

  • Page 22: Resistor Under Test Input Terminals (Bench Model Only)

    Section 2 automated with the standard resistor input terminals connected to the Line A 'Rs C & P' output terminals of an optional model 16 Channel Scanner(s). These terminals are located on the front panel for bench top models. 2.3.2. Resistor Under Test Input Terminals (Bench Model Only) The resistor under test input terminals consist of 4 low thermal binding posts.

  • Page 23: Display

    Section 2 2.3.6. Display The display is a combined green fluorescent vacuum consisting of 256  64 graphic display pixel and of 8  42-display character. 2.3.7. Numeric Keypad The numeric keypad consists of the following cited 15 keys; <0>, <1>, <2>, <3>, <4>, <5>, <6>, <7>, <8>, <9>, <...

  • Page 24: 6622T Series Rear Panel Connectors And Controls

    2.4.1. IEEE-488 Interface The IEEE-488 interface consists of the standard IEEE-488 interface connector. The IEEE-488 interface provides the means for the computer system to obtain complete computer control of the 6622T Series Automatic DCC Thermometry Bridge. OM6622T-A-00 30 January 2018...

  • Page 25: Line Input Connector

    Section 2 2.4.2. Line Input Connector The Line Input Connector is a combination of a 3-prong AC standard male connector, an ON/OFF switch and a fused input line voltage selector. The input line's voltage selector consists of a four-position selector and a fuse holder. The selector allows switching between the four possible tensions: 100 V, 120 V, 220 V and 240 V.

  • Page 26: Ground Terminal

    2.4.7. Ground Terminal The ground terminal consists of a four way green binding post. The ground terminal is bonded to the chassis of the 6622T Series and to power ground of the line input connector. 2.4.8. Extender Connector The Extender connector is a 6 pin circular connector which is used to connect the necessary signals to and from the 6623A Series or 6623 Range Extenders.

  • Page 27: Quick Measurement Guide

    Section 3 QUICK MEASUREMENT GUIDE 3.1. MEASUREMENT OPERATION GUIDE This section contains information regarding the measurement of resistors in the range of 1m ohm to 1G ohms. This guide is provided for manual front panel control of the 6622T bridge. An operation guide for full automatic control of the 6622T bridge, through the terminal of the system computer, is provided in the BridgeWorks Software User’s Manual.

  • Page 28: Normal Ohm Mode Resistance Measurement (All 6622T Models)

    Figure 3-2 shows a typical rear panel connection for this measurement mode. Specifications are based on use of shielded wire connections throughout, with shields connected to the 'GUARD' terminal. Use of SCW cable from Guildline is most recommended. NOTE: In this, as in all measurements, optimum results will be obtained if the environment is controlled.
  • Page 29 Section 3 Step 2) Connect the Rs and Rx terminals to the terminals of the resistor to be measured. The four terminals are labeled as C1, P1, C2, and P2, and should be connected to the corresponding terminals of the 4 terminal resistor to be measured.

  • Page 30: Table 3-1 : Recommended Normal Ohm Mode Test Setups

    Section 3 Ref. U.U.T. Itest Imax Reversal Comment (1) (mA) (mA) Rate (sec) () () Output current limited to 150 mA 31.6 31.6 3.16 31.6 0.316 31.6 31.6 31.6 10 k 3.16 3.16 10 k 0.316 3.16 100 k 0.032 10 k 3.16 3.16...

  • Page 31: Low Ohm Mode Resistance Measurement (All 6622T Models)

    Section 3 3.1.2. Low Ohm Mode Resistance Measurement (All 6622T Models) The 6622T in its Low Ohm Mode enables measurement of resistors below 1 ohm. When used with a 6623A series or 6623 range extender, measurement of low ohm resistors can be made with larger currents.
  • Page 32 Section 3 When a model 6623 and the external power supply are used, a user sets the test current on the external power supply, the bridge does not. When a model 6623A range extender is in use, enter the test current (for the resistor to be measured) in Amps.

  • Page 33: Table 3-2 : 6623 Recommended Low Ohm Mode Test Setup

    Section 3 Rs > (Extender Ratio) x Rx Ref. U.U.T. Itest Rs Current Extender Reversal Comment (1) (mAmps) Ratio Rate (sec) () () 0.316 31.6 10:1 1 W test in Rx 0.01 100:1 1 W test in Rx 0.001 31.6 31.6 1000:1 1 W test in Rx...

  • Page 34: Figure 3-3 : Rear Panel Connections - Low Ohm Mode With 6623

    Section 3 Figure 3-3 : Rear Panel Connections – Low Ohm Mode with 6623 OM6622T-A-00 30 January 2018...

  • Page 35: Figure 3-4 : Rear Panel Connections - Low Ohm Mode With 6623A-300

    Section 3 Figure 3-4 : Rear Panel Connections – Low Ohm Mode with 6623A-300 OM6622T-A-00 30 January 2018...

  • Page 36: Thermometry Measurement Mode

    Section 3 3.1.3. Thermometry Measurement Mode The model 6622T in its Thermometry Measurement Mode is similar to Normal Ohm mode but is enables measurement of PRT and SPRT probes in the range of 1m ohm to 100k ohms. The following steps outline the general procedure for making Normal Ohm measurements. Figure 3-4 shows a typical rear panel connection for this measurement mode.

  • Page 37: Figure 3-5 : Rear Panel Connections - Prt/Sprt

    Section 3 Figure 3-5 : Rear Panel Connections – PRT/SPRT OM6622T-A-00 3-11 30 January 2018...

  • Page 38: Bridgeworks Data Acquisition Software

    Adding optional 6664C Scanner(s) to work along with 6622T Series bridges and software control will create a fully automated Resistance Measurement System. Before using the 6622T with the computer, ensure that the operation of the software package is well understood.

  • Page 39: Instrument Operation

    Section 4 INSTRUMENT OPERATION 4.1. FRONT PANEL OPERATING PROCEDURE The 6622T Bridges is manually operable from the front panel. The BridgeWorks Software User's Manual contains the operating instructions for fully automatic software control of the 6622T Automatic DCC Thermometry Bridge via its computer system. 4.2.

  • Page 40: Figure 4-1 : Menu Tree - Measure/Sofcal

    Section 4 Measure Setup Sofcal Ratio Meas OFF Update 1 Power x1 No Filter Normal 0.001ppm Quick OFF Ohms Meas ON Update 2 Power x2 Decimation 0.01ppm Quick ON Update 4 N Average Delta 0.1ppm PPM SP 1.0ppm Delta SP 10.0ppm GPIB Coef Set...

  • Page 41: Figure 4-2 : Menu Tree - Setup (Resistor)

    Section 4 Measure Setup Sofcal Profiles Edit Normal Low Ohms Low Ohms Edit Edit Scale Edit 6623A-3A Edit 6623-2A 6623A-300A 6623/9923 6623 Custom (etc.) Figure 4-2 : Menu Tree – SETUP (Resistor) OM6622T-A-00 30 January 2018...

  • Page 42: Figure 4-3 : Menu Tree - Setup (Probe)

    Section 4 Measure Setup Sofcal Profiles Edit IPTS-68 ITS-90 IEC-751 Edit Edit Scale - Coeff Edit Neg Edit 6623-2A 6623/9923 Custom Figure 4-3 : Menu Tree – SETUP (Probe) OM6622T-A-00 30 January 2018...

  • Page 43: Figure 4-4 : Menu Tree - Measure-View

    Section 4 Summary Graph Detail Window Edit Graph Previous Next Summary Previous Summary Data Next Refresh Data Det Data Sum Detail Refresh Clear Det Clear Sum Detail Figure 4-4 : Menu Tree – MEASURE-VIEW OM6622T-A-00 30 January 2018...

  • Page 44: General Key/Display Operations

    Section 4 4.3. GENERAL KEY/DISPLAY OPERATIONS 4.3.1. Base menu Typically consists of four function key (or less) description areas, and a status line. When there are more than four functions for a given menu level a <Scrn n-N> function key will appear.

  • Page 45: Basic Menu Operations

    Section 4 4.4. BASIC MENU OPERATIONS 4.4.1. Menu Option-<MEASURE> In the menu option <MEASURE>, several function keys are defined where each key can cause one of several actions. If the function key <Fn> has multiple states, pressing the key beneath the displayed function will cause it to toggle between the valid states.

  • Page 46: Menu Option -

    Section 4 4.4.2. Menu Option - <any other menu but measure> In all other menu options if a function key has a defined set of alternate values, pressing that function key will cause one of the alternate values to be selected and displayed in the associated active area of the display screen.

  • Page 47: Base Edit/Select Menu - One Column Of Data

    Section 4 4.4.3. Base Edit/Select Menu - one column of data An optional header line can appear at the top of a screen display to prompt or inform the user with "details" of the present menu level. If a header line is displayed the number of selections are restricted to 5 or less.

  • Page 48: Operation Of Select/Edit Data Menus

    Section 4 4.4.5. Operation of Select/Edit Data Menus 4.4.5.1. Function - <Scrn n-N> If more than one screen of display information is available for selection as current at a menu level, then a <Scrn n-N> software function key will appear above the fourth function key <Fn-4>.

  • Page 49: Title Screen

    Section 4 4.5. TITLE SCREEN At power ON the 6622T will start its internal power on self-test programming and display its opening banner. This banner will outline the 6622T’s model configuration and the installed options. (i.e. -B, -XP, XPS, -XR, -XPR, -HV) The REMOTE DISPLAY screen will appear only when the 6622T has been addressed by a remote communication device on the GPIB .

  • Page 50: Main Menu

    Section 4 4.6. MAIN MENU The main menu, on power up will display a null measurement configuration where all parameters have been initialized to zero. On power up the 6622T Bridge will default to a standby condition with the measurement cycle of operations OFF i.e.

  • Page 51: Measure> Menu Fn-1 (Main)

    Section 4 4.6.1.1. <Measure> MENU Fn-1 (MAIN) Page 1 of 3 The <STATUS LINE> will only appear if the 6622T is currently making a measurement. The information displayed in the <STATUS LINE> depends on the options selected. if <PPM>, <PPM SP>, <DELTA>, or <DELTA SP> is the current selection then the <STATUS LINE>...

  • Page 52: Measure> Menu Fn-1 (Main)

    Section 4 4.6.1.2. <Measure> MENU Fn-1 (MAIN) Page 2 of 3 Available functions (menu page 2 of 3). Function key <Fn-1> selects the screen measurement update rate as a function of the test current reversal rate. <Update 1> sets a screen update rate at twice the test current reversal rate;...
  • Page 53 Section 4 4.6.1.3. <Measure> MENU Fn-1 (MAIN) Page 3 of 3 Available functions (menu page 3 of 3), last menu page. Function key <Fn-1> selects the mode of displaying the measurement data as <Normal>; parts per million <PPM>; change <Delta>; change ppm from a set point <PPM SP>;...

  • Page 54: Setup> Menu Fn-1 (Setup_Main)

    Section 4 4.6.2. <Setup> MENU Fn-1 (Setup_MAIN) ITS- 90 Celsius Probes Function key <Fn-3>, <Probes>, allows you to toggle between “Resistors” and “Probes”. 4.6.3. <Profiles> MENU Fn-1 (Profiles MAIN) Profiles allow the user to save resistor configuration files. 15 profiles are available. Function key <Fn-1>, <Select>, allows the selection and deletion of profiles.

  • Page 55: View

    Section 4 Function key <Fn-3>, <Create>, allows the creation of a new profile. Function key <Fn-2>, <Ok>, creates a new profile with the name as entered in the text. Function key <Fn-3>, <Scale>, allows insertion of special text for defining the resistor value.

  • Page 56: Detail Graph

    Section 4 <Refresh> updates the detail and summary values. <Detail> switches to the Detail display. <Clear Det> clears the trace buffer. It requires a confirmation to prevent accidental clearing. <Clear Sum> clears the summary buffer 4.6.4.2. Detail Graph <Data> switches to the detail display. <Previous>...

  • Page 57: Detail

    Section 4 4.6.4.3. Detail <Graph> switches to the graph display. <Previous> (if present) scrolls back by 5 entries. <Next> (if present) scrolls forward by 5 entries. The Up arrow scrolls the trace buffer up by one (1) entry. The Down arrow scrolls the trace buffer down by one (1) entry. The Left Arrow scrolls to the beginning of the trace buffer.

  • Page 58: Edit Ohms> Menu Fn-2 (Edit_Ohms Main)

    Section 4 Window Size. This prevents the screen from doing a complete refresh on each new entry once the window size is less than the number of trace entries. 4.6.5. <Edit Ohms> MENU Fn-2 (Edit_Ohms MAIN) Function key <Fn-1>, <Normal>, will select the Normal Ohm measurement mode of operation.

  • Page 59: Low Ohms> Menu Fn-3 (Edit Ohms_Main)

    Section 4 The Test Current value sets the current in the UNKNOWN RESISTOR (Rx). If the condition: [Test Current X (Rx/Rs)] >Max Current is satisfied, then the test is terminated, and an error message is displayed. The Max Current is the maximum current that can be carried by the STANDARD RESISTOR (Rs).
  • Page 60 Section 4 Press <Edit> and use arrow keys to move the highlight to the data line to be changed. Modify data and press <Ok>. Check resistance limits for Rx and Function key <Fn-3> will select the different available current range extender modes such as <6623A-3A>, <6623A-300>,<6623A-3000, and <6623>.

  • Page 61: Edit> Menu (Probe) Fn-2 (Edit Main)

    Section 4 4.6.6. <Edit> MENU (Probe) Fn-2 (Edit MAIN) The <Edit> menu will either be identical to the standard menu seen in the 6622T Series bridge, or be as described below dependent on the selection of the Resistors/Probes mode toggle key in the <Setup> menu. RS : Mode: Display:...

  • Page 62: Its 90> Menu Fn-2 (Edit Main)

    Section 4 4.6.6.2. <ITS 90> MENU Fn-2 (Edit MAIN) -Coeff: <Range 1> +Coeff: <Range 6> ──────────┬══════════┬─────────┬══════════ -Coeff │Edit Neg │+Coeff │Edit Pos Function Key <Fn-1> ,<-Coeff>, selects from the ITS90 set of temperature ranges: <Range 1> := <13.8 K to 273.16 K> : screen display ‘-259C to 0C’ <Range 2>...
  • Page 63 Section 4 When either the <Edit Neg> or <Edit Pos> key is pressed the PASSWORD CHECK display menu is activated. Before the selected set of coefficients can be changed the correct password must be entered. If an incorrect password is entered, the error message "Invalid Password" will be displayed and the edit session will be terminated.

  • Page 64: Iec 751> Menu Fn-3 (Edit Main)

    Section 4 4.6.6.2.2. < Edit Pos> MENU Fn-4 (ITS90 Edit MAIN) Pos Coeff Range: <0C to 962C> ──────────┬──────────┬─────────┬────────── Edit │Ok │ │ Press <Edit> and use arrow keys to move the highlight to the data line to be changed. Modify data and press <Ok>. 4.6.6.3.

  • Page 65: Sofcal> Menu Fn-3 (Main)

    Section 4 Press <Edit> and use arrow keys to move the highlight to the data line to be changed. Modify data and press <Ok>. A resistance value >0 for the ice point resistance (R0) or triple point of water resistance (Rtpw), MUST be entered for the probe before a measurement can take place.
  • Page 66 Section 4 Function Key <Fn-3>, <Diagnostic>, allows selection of functions that control the hardware. This function is useful when diagnosing problems with the 6622T. Sofcal menu selection menu page 2 of 4. Function Key <Fn-1>, <P.O.S.T.>, displays the result of the power on self test and the revision level of the installed software.

  • Page 67: Gpib>Menu Fn-1 (Sofcal_Main)

    Section 4 Function Key <Fn-1>, <PASSWORD>, allows setting of the unit password feature. By default the password is “6622” 4.6.7.1. <GPIB>MENU Fn-1 (Sofcal_MAIN) <Address> function key Fn-1 sets the GPIB address. <Mode> function key Fn-2 selects from the options <Talk/Listen>, <Talk Only>, <Disabled>.

  • Page 68: Diagnostic> Menu Fn-3 (Sofcal_Main)

    Section 4 Line Frequency is either 60 Hz or 50 Hz. ADC Beta must be between 225 and 330. This is a factory setting. 4.6.7.3. <Diagnostic> MENU Fn-3 (Sofcal_MAIN) To enter the Diagnostics window a password must be supplied. Diagnostic menu selection page 1 of 4. Function Key <Fn-1>, <Monitor>...
  • Page 69 Section 4 CAUTION: Do not enter a number larger than 8747. 4.6.7.3.1. <Monitor> MENU Fn-1 (Diagnostic_Sofcal_MAIN) This diagnostic menu allows monitoring of the signals on the servo board. 4.6.7.3.2. <Diagnostic> MENU Fn-1 (Sofcal_MAIN) Diagnostic menu selection page 2 of 4. Function key <Fn-1>, <Sign>...
  • Page 70 Section 4 Function key <Fn-3>, <Range> selects the measurement voltage range for the built-in voltmeter from: <20V>, <2V>, <200mV>, <20mV>, <2mV>. Diagnostic menu selection page 3 of 4. Function key <Fn-1>, <Mode> sets the measurement mode from the choice of <Normal> and <Low>. Function key <Fn-2>, <Speed>...

  • Page 71: P.o.s.t.> Menu Fn-1 (Sofcal_Main)

    Section 4 4.6.7.4. <P.O.S.T.> MENU Fn-1 (Sofcal_MAIN) This Sofcal menu selection displays the results of the internal self-test performed by the 6622T. NOTE: A restricted access password system has been implemented for certain Sofcal functions. If the password is changed it can be reset to the factory default password by entering this menu and pressing in order: Left Arrow, Right Arrow, Up Arrow, Down Arrow.

  • Page 72: Filter> Menu Fn-2 (Sofcal_Main)

    Section 4 4.6.7.5. <Filter> MENU Fn-2 (Sofcal_MAIN) Function key Fn-1 <Average N> allows the number of data samples to be set for the simple averaging filter <1, 2, 4, 8, 16, 32, 64, and 128>. Function key Fn-2 <Decimation> allows the setting of the decimation filter factor <0.001 through 0.500>.

  • Page 73: Sys Time>Menu Fn-2 (Sofcal Main)

    Section 4 4.6.7.7. <Sys Time>MENU Fn-2 (Sofcal MAIN) This allows the updating of the system date and time. The time is entered in 24 hour format. 4.6.7.8. <Extender>MENU Fn-3 (SofcalMENU) This allows creation, deletion and editing of extenders. Existing extenders are selected with <UP> and <DOWN> arrows and the edit or delete acts on the highlighted extender.
  • Page 74 The 6622T always sets current to zero(0) and then sets the specified current during state changes. (turns or polarity) For a standard Guildline Product the setting for this stage is 1 second.
  • Page 75 The 6622T always sets current to zero(0) and then sets the specified current during state changes. (turns or polarity) For a standard Guildline Product the setting for this stage is 1.5 seconds.
  • Page 76 Section 4 Ratio is the extender ratio for this stage. For a standard Guildline product this is one hundred(100). Minimum Amps is used to specify the minimum current for this stage. For a standard Guildline product this is 3.0 A.
  • Page 77 The 6622T always sets current to zero(0) and then sets the specified current during state changes. (turns or polarity) For a standard Guildline Product the setting for this stage is 2.0 seconds.

  • Page 78: Password> Menu Fn-1 (Sofcal_Main)

    For a standard Guildline product this is 1. Slave state is used to select the stage. For a standard Guildline product this is 1. For a Guildline 6623A-3000 the slave count is set to 20. 4.6.6.9 PASSWORD> MENU Fn-1 (Sofcal_MAIN) In order to obtain access to change the system password the current password must be supplied.
  • Page 79 Section 4 The password can be changed using the keypad numeric keys. A string of up to nine (9) characters can be entered for the password. Function key <Ok> will accept the new password as entered. NOTE: The factory default password is: 6622 If the password has been changed and subsequently misplaced, see Section 4.6.7.4 <P.O.S.T.>, to allow recovery of the factory default password setting.
  • Page 80 Section 4 OM6622T-A-00 4-42 30 January 2018...

  • Page 81: Verification And Calibration

    10 kΩ standard resistor, stable to ±0.01 ppm over a 24 hour period (x2) Note: Ten of these standard resistors are available in the optional model 6634A Resistance Standard and up to four reference resistors are available in the portable Guildline Instruments model 6634TS Resistance Standard. OM6622T-A-00 30 January 2018...

  • Page 82: Set Up

    6664C scanner as defined above. Set these standard resistors into the controlled temperature environment and allow time for them to stabilize. The Guildline model 6634A offers up to 10 of these resistors in a temperature stabilized rack mountable chamber. Open the BridgeWorks Data Acquisition Software in the computer.
  • Page 83 Section 5 = (1/2) x (R ) -1 x 10 3. The maximum allowable interchange closure errors (ppm) for the following resistor pairs are: Resistor Resistor Interchange Closure Error 1  1  0.05 100  100  0.05 0.05 10 k...

  • Page 84: Temperature Ratio Verification

    6622T. 5.2.1. Purpose The purpose of the procedure in this section is to assure that the model 6622T Series Bridge functions properly and meets the manufacturer’s additional specifications for Temperature Measurement. It is recommended that these procedures be performed after any corrective maintenance activity, or if the operator perceives a problem.

  • Page 85: Set Up

    6664C scanner as defined above. Set these standard resistors into the controlled temperature environment and allow time for them to stabilize. The Guildline model 6634A offers up to 10 of these resistors in a temperature stabilized rack mountable chamber. Open the BridgeWorks Data Acquisition Software in the computer.
  • Page 86 Section 5 = (1/2) x (R ) -1 x 10 3. The maximum allowable interchange closure errors (ppm) for the following resistor pairs are: Resistor Resistor Interchange Closure Error 0.05 10 10 0.05 100 100 0.05 1k 1k 4. For the 100:1 ladder up closure errors, the 100:1 ratio must agree to within the specification of the nominal ratio for either directly measuring the 100:1 ratio, or calculating the ratio from the product of the 100:10 ratio and the 10:1 ratio, as follows:...

  • Page 87: Troubleshooting And Maintenance

    Section 6 TROUBLESHOOTING AND MAINTENANCE 6.1. INTRODUCTION This section covers troubleshooting, repair and verification of the 6622T Automatic DCC Thermometry Bridge. 6.1.1. Error Messages The 6622T Automatic DCC Thermometry Bridge will display error messages either on the front panel display of the 6622T Thermometry Bridge in manual mode or on the computer monitor when using the BridgeWorks Data Acquisition Software.

  • Page 88: Table 6-1 : Model 6622T Error Messages

    Section 6 Error Number Error Corrective Measures nV Detector Communication -None, fatal hardware error (try power Failure switch) Invalid Test Setup -Resistors not wired to Rx and Rs terminals properly, improper test setup Servo Railed -No current path on Rx or Rs terminals Nano Zero, nVoltmeter not -Cycle power...

  • Page 89: Model 6622T Setup Warnings

    Section 6 6.1.2. Model 6622T Setup Warnings The model 6622T Thermometry Bridge provides limit checks for variables that can be setup during the configuration of a measurement. Below is a listing of the warnings that may appear on its display in manual operation or on the computer monitor when the BridgeWorks Data Acquisition Software is used.

  • Page 90: Purpose

    Section 6 6.2.1. Purpose The purpose of this procedure is to assure that the 6622T Automatic DCC Thermometry Bridge is fully operational by testing all ratio ranges and basic measurement modes. It is not a test for full rated accuracy. To test the 6622T to full rated accuracy see Section 5 for verification and calibration.

  • Page 91: Check Procedure

    Section 6 6.2.4. Check Procedure 1. Use the “Test Sequence” function of the “Configuration” menu of the BridgeWorks Data Acquisition Software to measure the resistance ratio of each resistor pair with the corresponding excitation current and reversal rate listed below. See the BridgeWorks Software User’s Manual for the particulars of running a test sequence.
  • Page 92 Section 6 OM6622T-A-00 30 January 2018...

  • Page 93: Remote Control

    Section 7 REMOTE CONTROL The model 6622T Automatic DCC Thermometry Bridge series operates directly from the front panels or under remote control of the computer supplied with the system. Remote control can be interactive, with the user controlling each step from a terminal (not supplied with the system), or under the control of the computer running the model 6622T as an automated system with the use of the BridgeWorks Data Acquisition Software.

  • Page 94: Controller

    Guildline Instruments Part Number 996-23006 is a suitable IEEE-488 cable assembly of length 2 meters. Each connector assembly is fitted with a pair of captive locking screws.

  • Page 95: Typical System

    Section 7 7.2.4. Typical System The 8-Data Input/Output Lines form the data bus over which data between the various devices is transmitted under the supervision of the controller. The message bytes are carried on Data I/O signal lines in a bit parallel byte serial form, asynchronously and generally in a bi-directional manner.

  • Page 96: Address And Talk/Listen Selection

    Section 7 7.2.5. Address And Talk/Listen Selection The IEEE-488 Address and Talk/Listen status can be set using the front panel controls as directed by the operator menu system. If there is no controller and the model 6622T is hooked up to a printer for hard copy, then Talk Only mode should be selected as the preferred mode of operation.

  • Page 97: Table 7-2 : Ieee-488 Connector Pin Designations

    Section 7 ┌────────┬────────┬────────────────────────────────────────────┐ │ │ NAME │ DESCRIPTION │ ╞════════╪════════╪════════════════════════════════════════════╡ │ │ DIO1 │ Data Input Output Line 1 │ ├────────┼────────┼────────────────────────────────────────────┤ │ │ DIO2 │ Data Input Output Line 2 │ ├────────┼────────┼────────────────────────────────────────────┤ │ │ DIO3 │ Data Input Output Line 3 │...

  • Page 98: Ieee-488 Output Buffering

    Section 7 ┌──────────────────────┬───────┐ │ Source Handshake │ │ ├──────────────────────┼───────┤ │ Acceptor Handshake │ │ ├──────────────────────┼───────┤ │ Talker │ │ ├──────────────────────┼───────┤ │ Listener │ │ ├──────────────────────┼───────┤ │ Service Request │ │ ├──────────────────────┼───────┤ │ Remote Local │ │ ├──────────────────────┼───────┤ │ Parallel Poll │...

  • Page 99: Command Language

    Section 7 7.3. COMMAND LANGUAGE The commands for IEEE-488 mainly correspond to the labels assigned to the front panel menus. The examples will not show the termination character. 7.3.1. General Syntax For Commands The model 6622T uses a sophisticated command parser which can usually determine which command was desired, even if the command is entered incorrectly.

  • Page 100: Model 6622T Programming Command Summary

    Section 7 Remote: When the Remote Enable (REN) line is asserted and the controller addresses the model 6622T as a listener, the model 6622T enters the remote state. Front panel operation is restricted to the use of the Remote softkey/pushbutton. Pressing the Remote softkey or sending the GTL (Go To Local) interface message returns the model 6622T to the local state.
  • Page 101 Section 7 bit 5 = ESB (event summary) ; set when bitwise AND of ESE, register is not zero bit 4 = MAV (message available) ; set when GPIB Tx buffer has data available ; cleared when the buffer is empty bit 3 = IFL (input buffer full) ;...
  • Page 102 Section 7 COMMAND COMMENT MEASure:UNIT <unit> select the units of measurement and instrument operation <unit> :== R|O|C|F|K|V type <letter> R:==Ratio O:==Ohms C:==Celsius F:==Fahrenheit K:==Kelvin V:==Volts MEASure:UNIT? query, display the units of measurement MEASure:FILTer <function> setup the digital filter for the display data <function>:== 0|1|2 type <digit>...
  • Page 103 Section 7 COMMAND COMMENT data MEASure:RESOlution <prec> select the precision of reporting the data <prec>:==0|1|2|3|4 type <digit> 0 :== 0.001 ppm 1 :== 0.01 ppm 2 :== 0.1 ppm 3 :== 1.0 ppm 4 :== 10.0 ppm MEASure:RESOlution? query, display the precision of reporting the data MEASure:VOLT <state>...
  • Page 104 Section 7 COMMAND COMMENT CONFigure:DATUm? query, display the datum used as the set point in all difference calculations CONFigure:FILTer <size1>,<size2> initialize the filter coefficients <size1> :== <nr3> decimation filter coefficient <size2> :== <unsigned> N average filter coefficient CONFigure:FILTer? query the filter coefficients CONFigure:RESIstor <md>, <RS_SN>, <SN>, <RX>, <Rev_Rate>, <Tst_Val>, <Tst_Max>...
  • Page 105 Section 7 COMMAND COMMENT <unit>:== R|O type <letter> R:==Ratio O:==Ohms <rate>:== 0|1|2 type <digit> 0:==1 updates/cycle 1:==2 updates/cycle 2:==4 updates/cycle <filter>:== 0|1|2 type <digit> 0 :== none 1 :== decimation 2 :== simple average <size>:==<unsigned> size = % for decimation = sample size for simple average <power>:== 0|1|2 type <digit>...
  • Page 106 Section 7 COMMAND COMMENT ref. resistor value <RS_SN>:==<string> ref. resistor serial # <R0>:==<nr3> Probe resistance at ice point (IPTS68) Or triple point of water (ITS90) <PRT_SN>:==<string> probe resistor serial # <Rev_rate>:==<nr3> test current reversal rate <Tst_Val>:==<nr3> test current/volts <Tst_Max>:==<nr3> max current(Is) for ref resistor CONFigure:PROBe? query, display active probe configuration Information;...
  • Page 107 Section 7 COMMAND COMMENT R:==Ratio O:==Ohms C:==Celsius F:==Fahrenheit K:==Kelvin <rate>:== 0|1|2 type <digit> 0:==1 updates/cycle 1:==2 updates/cycle 2:==4 updates/cycle <filter>:== 0|1|2 type <digit> 0 :== none 1 :== decimation 2 :== simple average <size>:==<unsigned> size = % for decimation = sample size for simple average <power>:== 0|1|2 type <digit>...
  • Page 108 Section 7 COMMAND COMMENT <coeff_00>:==<nr3> <coeff_xx> are coefficients 01 through n for the probe ITS90 conversion algorithm. When <equation>:==00 the IPTS68 coefficients can be set. CONFigure:PROBe:PositiveCOEfficient? query, display the active probe positive temperature coefficients CONFigure:PROBe:NegativeCOEfficient? query, display the active probe negative temperature coefficients CONFigure:VOLTmeter <range>, <zero>, <high>, <ref>...
  • Page 109 Section 7 COMMAND COMMENT 0 :== disable 1 :== talk only 2 :== talk/listen SYSTem:COMMunicate:GPIB? query, display GPIB set up SYSTem:TERSe respond to commands with a minimum data SYSTem:VERBose respond to commands with a minimum data SYSTem:VERSion? query, display the installed software version SYSTem:DIAGnostic:ROMChecksum? query, display rom checksum SYSTem:DIAGnostic:SERialNumber <number>...
  • Page 110 Section 7 COMMAND COMMENT 4:==10:1 ratio (81 turns) 5:==100:1 ratio type<digit> <range>: == 0|1|2|3|4|5|6|7|8 type<digit> 0:==1 ohm Rs range 1:==10 ohm Rs range 2:==100 ohm Rs range 3:==1k ohm Rs range 4:==10k ohm Rs range 5:==100k ohm Rs range 6:==1M ohm Rs range 7:==10M ohm Rs range 8:==100M ohm Rs range <corr>:==<nr3>...
  • Page 111 Section 7 COMMAND COMMENT <range>: == 0|1|2|3|4|5|6|7|8 type<digit> 0:==1 ohm Rs range 1:==10 ohm Rs range 2:==100 ohm Rs range 3:==1k ohm Rs range 4:==10k ohm Rs range 5:==100k ohm Rs range 6:==1M ohm Rs range 7:==10M ohm Rs range 8:==100M ohm Rs range SOFCAL <beta>...
  • Page 112 Section 7 COMMAND COMMENT ADconvRead? query, display adc reading in engineering units ADconvB? query, display adc in raw binary units Filter? query, display the nano voltmeter filter setting Filter <function> set the nano voltmeter filter <function>:==0|1 type <boolean> 0:== OFF 1:== ON Highres? query, display the high resolution mode setting...
  • Page 113 Section 7 COMMAND COMMENT 3:== +40 Volts 4:== -40 Volts 5:== primary current 7:== calibrate ISResolution? query, display the resolution setting ISResolution <resolution> set the resolution <resolution>:==0|1|2 type <digit> 0 :== high 1 :== medium 2 :== low ISSpeed? query, display the speed setting ISSpeed <speed>...
  • Page 114 Section 7 OM6622T-A-00 7-22 30 January 2018...

  • Page 115: Appendices

    Section 8 APPENDICES 8.1. GENERAL SPECIFICATIONS (continued) 6622T Series General Specifications       Table 8-1 : General Specifications (continued) OM6622T-A-00 30 January 2018...

  • Page 116: Resistance Measurement Specification

    Section 8 8.2. RESISTANCE MEASUREMENT SPECIFICATION The following tables show the uncertainty contribution of the model 6622T Bridges to the total measurement. Because of the wide range of Rx/Rs ratios available, it is possible to measure UUT’s with a variety of Rs standards. For example, a 100...

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