Guildline 7520 Operation And Instruction Manual
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Guildline 7520 Operation And Instruction Manual

Precision voltage divider
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OPERATION AND INSTRUCTION MANUAL
FOR
MODEL 7520
PRECISION VOLTAGE DIVIDER
www.guildline.com
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.
OM7520-B-00
27 September, 2019

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  • Page 1 PRECISION VOLTAGE DIVIDER www.guildline.com 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 WARRANTY: This product is warranted against defects in materials and workmanship for a period of two years from date of shipment. During the warranty period, Guildline Instruments Limited will, at its option, either repair or replace products that prove to be defective.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION ....................1-1 1.1. DESCRIPTION ............................. 1-1 1.2. WARRANTY ............................1-1 1.3. TO OBTAIN WARRANTY SERVICE ....................1-3 1.4. SPECIFICATIONS ..........................1-4 INSTALLATION ....................2-1 2.1. INITIAL INSPECTION ........................2-1 2.2. POWER REQUIREMENTS ........................ 2-1 2.3. LOCATION ............................2-1 2.4.
  • Page 6 3.9. 1000:1 RATIO DIVIDER ........................3-19 3.10. CONNECTION AND VOLTAGE COMPARISON INSTRUCTIONS ......... 3-20 3.11. 0.01 VOLT, 1:1000 RATIO COMPARISON ..................3-21 3.12. 0.1 VOLT, 1:100 RATIO COMPARISON ..................3-21 3.13. 1 VOLT, 1:10 RATIO COMPARISON ..................... 3-21 3.14. 10 VOLT, 1:1 RATIO COMPARISON ..................... 3-22 3.15.
  • Page 7 REMOTE CONTROL .................... 6-1 6.1. REMOTE OPERATION ........................6-1 6.2. REMOTE COMMANDS ........................6-2 OM7520-B-00 27 September, 2019...
  • Page 8 FIGURE 3-2: REAR PANEL GUILDLINE MODEL 7520................. 3-2 FIGURE 3-3: GUILDLINE MODEL 7520 MENU/SCREEN HIERARCHY ........... 3-3 FIGURE 3-4: MODEL 7520 CONNECTIONS FOR OPERATION AS A VOLTAGE DIVIDER ....3-18 FIGURE 3-5: MODEL 7520 CONNECTIONS FOR COMPARISONS UUT TO 10 VOLTS ....... 3-20 FIGURE 4-1: 7520 COMPARISON MEASUREMENT CONFIGURATIONS ..........

  • Page 9: Introduction

    Special care has been taken to minimize thermal offsets and noise. The switches used are high isolation, low thermal relays. The 7520 can be operated from the front panel touch screen or by SCPI commands sent over the USB or IEEE Interfaces.
  • Page 10 Section 1 Guildline will repair or replace any failed unit at no additional cost to the customer. Guildline will be responsible for returning warranty standards to the owner and will bear transportation costs from the repair center back to the user. It will be the customer’s responsibility for transportation costs for equipment returned to Guildline for repair or replacement.

  • Page 11: To Obtain Warranty Service

    USA and Canada Fax: 1-613-283-6082 Outside US and Canada Telephone: + [0] [1] 613 283-3000 Outside US and Canada Fax: + [0] [1] 613 283-6082 You can also contact Guildline Instruments Limted via their Email or Website. Email is: sales@guildline.com Website is: www.guildline.com...

  • Page 12: Specifications

    Section 1 1.4. SPECIFICATIONS VOLTAGE DIVIDER RATIO SELECTIONS 1:1000, 1:100, 1:10, 1:1, 10:1, and 100:1 VOLTAGE DIVIDER RATIO UNCERTANTIES 7520 S P EC IF ICA TI O N S Voltage Divider Ratios Output Uncertainty Voltage Divider Ratio 0.05 10:1 100:1...
  • Page 13 Section 1 INPUT VOLTAGE RANGE 0.01 volts to 1100 volts NOMINAL OUPUT VOLTAGES 0.01, 0.1, 1.0, 10, 100, and 1000 volts ENVIRONMENTAL LIMITS Operating: 19.5 C to 26.1 C and 20 % to 50 % relative humidity Storage: C to 70 C and 15 % to 80 % relative humidity POWER COEFFICIENT EFFECTS ON RATIO ACCURACY <...
  • Page 14 Section 1 WEIGHT 11 kg (24 lb.) LINE POWER 100 V – 240 V ± 10 % 45 Hz to 66 Hz 60 VA OM7520-B-00 27 September, 2019...

  • Page 15: Installation

    Section 2 INSTALLATION 2.1. INITIAL INSPECTION This instrument was carefully inspected both mechanically and electrically before shipment. It should be free of marks and scratches and in perfect electrical order upon receipt. Unpack the instrument and retain the shipping container until the instrument has been inspected for damage in shipment.

  • Page 16: Warm-Up And Self Alignment

    2.4. WARM-UP AND SELF ALIGNMENT When the 7520 is first powered up a red screen will appear during an initialization phase which takes about 20 seconds. Following successful initialization, you will be greeted by the main screen, the heaters will be automatically turned ON and the status bar at the bottom of all screens will show “Warming up”.

  • Page 17: Manual Operation

    MANUAL OPERATION 3.1. FRONT PANEL Figure 3-1: Front Panel Guildline Model 7520 1. TOUCH SCREEN INTERFACE - Used for front panel operation. Refer to section 3.3 for operation. 2. VOLTAGE INPUT - Terminals for connection to the input of the voltage divider resistance chain.

  • Page 18: Rear Panel

    Section 3 3.2. REAR PANEL Figure 3-2: Rear Panel Guildline Model 7520 1. BOOTLOADER SWITCH - Switch to allow firmware upgrade. 2. IEEE-488 - Access for IEEE-488 interface bus for external control. 3. USB INTERFACE BUS - Type B connector used to connect voltage divider to external controller (i.e.

  • Page 19: Front Panel Operation

    The Precision Voltage Divider is operated manually using the touch screen interface. The GUI (Graphical User Interface) navigates through all of the functions and operation of the 7520. The navigation is straightforward and is described in the following diagram of the screen/menu hierarchy.

  • Page 20: Touch Screen Display Functions

    7520 such as firmware revision, and system date/time of the 7520. The opening banner is also the root of the menu system. There are 5 main menu areas on the 7520 indicated by “Divider”, “Comparator”, “Setup”, “Status”, and “Log”.

  • Page 21: Divider Menu Screen

    Section 3 3.4.2. Divider Menu Screen The “Divider” menu allows the selection of the available divider voltage ratios and displays the current status of the measurement configuration. On the display you will see the status of the configuration indicated in green, signifying the active measurement configuration.
  • Page 22 Section 3 WARNING: NEVER CHANGE OR ENGAGE A VOTAGE DIVIDER MODE OF OPERATION, OR RATIO, WHILE LIVE VOLTAGE IS PRESENT. VOLTAGE INPUTS SHOULD BE TURNED OFF BEFORE SWITCHING MEASUREMENT CONFIGURATIONS. CHANGING MEASUREMENT SETUPS WITH LIVE INPUT VOLTAGE CAN DAMAGE THE VOLTAGE DIVIDER, OTHER CONNECTED EQUIPMENT AND POSSIBLY RESULT IN INJURY OR DEATH.

  • Page 23: Comparator Menu Screen

    Section 3 3.4.3. Comparator Menu Screen The “Comparator” menu allows the selection of the available divider voltage comparisons to a reference voltage and displays the current status of the measurement configuration. On the display you will see the status of the configuration indicated in green, signifying the active measurement configuration.

  • Page 24: Setup Menu Screen

    Note: The “Non-Align” function enables a forced operation override of the 7520 such that the device will allow operation in a “Non-Aligned” therefore uncalibrated state. This is intended for demonstration and training purposes and should never be used for official measurements. If during “Non-Align”...

  • Page 25: Self-Alignment Screen

    If the warming up process failed, the warm up status bar will turn red and a “Warm up failed” message will appear. The 7520 will then wait for the operator to respond.
  • Page 26 “Self-Alignment failed” message will appear. The 7520 will then wait for the operator to respond. Note: If a “Self-Alignment” error occurs then the 7520 may be too close to a heat source or fluctuating temperature. Verify the environmental conditions and restart the 7520 Self-Alignment.
  • Page 27 “Self-Alignment passed”. Note: If a “Self-Alignment failed” error occurs, then check for other warnings and restart the 7520 Self-Alignment. If the problem persists, the device may need to be returned to the factory for adjustment.

  • Page 28: Password Screen

    Section 3 3.4.4.2.Password Screen To allow access to the system and calibration functions of the 7520 a system password must be entered. This screen allows an operator to change the system password. When entering the “Password” menu you will be prompted to “Current Password”...

  • Page 29: Offset Adjustment Screen

    Process and it is recommended that the Calibration Parameters not be changed; and if changed that it be done by qualified personnel. On original shipment these parameters are set to the Guildline calibration settings. Note that the screens to change the offset adjustments are password protected.
  • Page 30 Section 3 The “Logging…” process will take a few seconds when the “Save&Exit” is pressed. OM7520-B-00 3-14 27 September, 2019...

  • Page 31: System Parameters Screen

    The “System Parameters” screen displays and allows changes to be made to the system parameters of the 7520. Touching any of the grey areas will open a corresponding screen to edit and change the parameter displayed in the grey areas.
  • Page 32 Section 3 The “System” >> “Time” screen allows changes to be made to the 7520 system time. Touching the grey areas will place a cursor into the field allowing the field to be changed. The “OK” button sets the time to the time displayed and exits the screen.

  • Page 33: Status Screen

    Section 3 3.4.5. Status Screen The “Status” screen shows the system status such as last alignment date/time, calibration date/time, system date/time, and internal temperature. You may enter this screen at any time without affecting the measurement. The information on this display is updated once a second. 3.4.6.

  • Page 34: Connection And Voltage Divider Instructions

    CONNECTION AND VOLTAGE DIVIDER INSTRUCTIONS There are four primary ratio configurations for dividing any value voltages up to 1000 volts. The 7520 Precision Voltage Divider can be configured for voltage ratios from 1:1 up to 1000:1. An operator needs to be aware that body heat from touching leads and terminals can result in thermals that can introduce errors.

  • Page 35: 10:1 Ratio Divider

    Section 3 3.7. 10:1 RATIO DIVIDER This configuration is used to divide by a factor of 10 the voltage that is present at the Voltage Input terminals. Connect as described in Figure 3-4. Configure the touch screen for the 10:1 divider ratio and enable the divider. Turn on the input voltage source and a voltage will be produced at the Voltage Output that is the Voltage Input divided by 10.

  • Page 36: Connection And Voltage Comparison Instructions

    Input Detector Reference Figure 3-5: Model 7520 Connections for Comparisons UUT to 10 Volts NOTE: An operator needs to be aware that body heat from touching leads and terminals can result in thermals that can introduce errors. Due to the high impedance of most voltage measurement equipment operator proximity can also affect the measurement results.

  • Page 37: Volt, 1:1000 Ratio Comparison

    Allow sufficient time for the measurement to stabilize. Once a null is obtained the 0.01 volt source is equal to the 10 volt reference standard certified value divided by the 1:1000 ratio of the 7520. 3.12. 0.1 VOLT, 1:100 RATIO COMPARISON Configuration B is used for the comparison of a 0.1 volt source to a 10 volt reference...

  • Page 38: Volt, 1:1 Ratio Comparison

    Once a null is obtained the 100 volt source is equal to the 10 volt reference standard certified value multiplied by the 10:1 ratio of the 7520. Note that the 100 V source should be turned off before choosing this menu selection and should be turned off before choosing another menu selection.

  • Page 39: Theory Of Operation

    Several systems are used to protect the devices connected to the divider and the voltage divider itself from being damaged by operator error or internal failure. The 7520 Voltage Divider can be operated from the front panel touch screen or by commands sent over the USB or GPIB Interface.

  • Page 40: Internal Circuits

    4.3. INTERNAL CIRCUITS The 7520 is designed to allow easy operation from both the USB or GPIB interfaces and the front panel. The USB interface is designed to work with a connected computer and installs as a virtual com port and can be used with any terminal program which supports serial interfaces, such as HyperTerminal.

  • Page 41: Comparison Measurement Configurations

    Section 4 4.5. COMPARISON MEASUREMENT CONFIGURATIONS The Model 7520 Precision Voltage Divider can be configured to allow relative and direct- ratio measurements of signals input to the front panel terminations for each of the voltage configurations shown in the diagrams below. These configurations are for forward and reverse polarity measurements.

  • Page 42: Measurement Configuration A: 0.01 Volt Comparison

    The low side of the divider chain produces a known 0.01 volt source to be compared to the UUT 0.01 volt source connected to the 7520 Voltage Input terminals. The comparison is done via an external null detector connected to the Null Detector terminals.

  • Page 43: Measurement Configuration E: 100 Volt Comparison

    The Voltage Ratio Alignment cannot be performed when the 7520 is powered on until the temperature controlled chamber has come up to a stable temperature. The alignment function is completed within 2 hours and the touch screen will report the results of the alignment.

  • Page 44: Maintenance And Trouble Shooting

    All shields should be connected to the 7520 “GUARD” terminal and one guard terminal of the external devices if available. Further to Guard, ensure there is no direct airflow or heat/cooling sources nearby as these can cause thermal EMF’s and affect the measurement process.
  • Page 45 Install the Microchip Bootloader application (PIC32UBL.exe) via the AN1388 Source Code 2014_02_14.exe installer. By default the application is installed in ▪ C:\AN1388_Source_Code_2014_02_14\PIC32_Bootloaders\PC Application\PIC32UBL.exe • The 7520-AF application image, 7520-AF_fRTOS.X.production.hex. Step Description Power off the 7520-AF unit. Connect the PC USB to the unit’s USB connector.
  • Page 46 Section 5 Invoke the PIC32 Bootloader Application Select the USB connection Enable Checkbox. Connect to the 7520-AF PIC32 firmware. Load the 7520-AF_fRTOS.X.production.hex file. OM7520-B-00 27 September, 2019...
  • Page 47 Power off and on the unit to boot into the new application. It is possible that a new screen needs to be updated when upgrading system firmware. The 7520-AF will do this automatically upon first power-up with a new firmware load. In this case you should see the following screens upon first power-up from a new firmware before loading the main screen.
  • Page 48 REMOTE CONTROL 6.1. REMOTE OPERATION The 7520 has a GPIB and USB port located on the rear panel which is used for remote operation. These ports can be used to communicate with the 7520, or accessed programmatically through a PC computer.
  • Page 49 Section 6 6.2. REMOTE COMMANDS A brief description of each of the possible remote commands and their syntax in BNF (Backus Naur Form) follows: - words inside angle brackets (i.e. < and > ) are defined items - :== means "is defined to be" - | means "or"...
  • Page 50 Section 6 CONFigure:COMParator <value> set the Comparator Value <value>:== 0|1|2|3|4|5|6 0=open 1=0.01V 2=0.1V 3=1V 4=10V 5=100V 6=1000V CONFigure:COMParator? query, display the Comparator Value CONFigure:REFerence <polarity> set the configuration reference polarity <polarity>:==0|1 0=negative 1=positive CONFigure:REFerence? query, display the configuration reference polarity CONFigure:NONALign <value>...
  • Page 51 Section 6 SYSTem:STATE? query, display the system state return value:== 0|1|2|3|4|5|6|7 0=warming up 1=warmed up 2=warm up failed 3=self alignment passed 4=self alignment failed 5=self alignment cancelling 6=self alignment in process 7=logging SYSTem:TERSe respond to commands with a minimum data set SYSTem:VERBose respond to commands with a maximum data set SYSTem:VERSion?

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