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Guildline 7520, Operation And Instruction Manual

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Guildline 7520 Operation And Instruction Manual Download Page 40

 

Section 4

 

 

OM7520-B-00

 

27 September, 2019   
 

4-2 

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. 

To operate from the front panel, the touch screen interface allows for control of the settings 
and associated parameters for the two modes of operation and for each of the measurement 
configurations;  as  well  as  to  activate  the  7520  input  and  output  connections  through  the 
divider chain sections.   

Both the touch screen and USB/GPIB interfaces are controlled by a microprocessor which 
is kept isolated from the analogue circuits that are part of the voltage divider chain.  This 
high isolation ensures no noise or offsets will be present in measurements conducted with 
the 7520 due to heat and noise from the rest of the circuitry inside the 7520. 

4.4.

 

CIRCUIT PROTECTION 

The 7520 has several protection features to help ensure the equipment used with the 7520, 
as  well  as  the  7520  itself,  will  be  safe  from  damage.    Critical  voltages  are  monitored 
through the micro-processor which will disconnect inputs and outputs when over voltages 
are sensed.  

The  divider  chain  itself  is  protected  from  over  voltages  on  the  input  as  there  is  only  one 
high impedance input that is used for all divider ratio configurations. 

 

Summary of Contents for 7520

Page 1: ...anual 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 ...

Page 2: ......

Page 3: ...ildline Instruments Limited nor any of its employees shall be liable for any direct or indirect special incidental or consequential damages arising out of the use of this product No other warranty is expressed or implied SAFETY PRECAUTIONS This product has been designed and tested in accordance with IEC1010 1 EN61010 1 including amendment 1 1995 for insulation category II use Use of this equipment...

Page 4: ......

Page 5: ...AR PANEL 3 2 3 3 FRONT PANEL OPERATION 3 3 3 4 TOUCH SCREEN DISPLAY FUNCTIONS 3 4 3 4 1 Opening Banner Main Display Screen 3 4 3 4 2 Divider Menu Screen 3 5 3 4 3 Comparator Menu Screen 3 7 3 4 4 Setup Menu Screen 3 8 3 4 4 1 Self Alignment Screen 3 9 3 4 4 2 Password Screen 3 12 3 4 4 3 Offset Adjustment Screen 3 13 3 4 4 4 System Parameters Screen 3 15 3 4 5 Status Screen 3 17 3 4 6 Log Screen 3...

Page 6: ...LOW THERMAL DESIGN 4 1 4 3 INTERNAL CIRCUITS 4 2 4 4 CIRCUIT PROTECTION 4 2 4 5 COMPARISON MEASUREMENT CONFIGURATIONS 4 3 4 6 MEASUREMENT CONFIGURATION A 0 01 VOLT COMPARISON 4 4 4 7 MEASUREMENT CONFIGURATION B 0 1 VOLT COMPARISON 4 4 4 8 MEASUREMENT CONFIGURATION C 1 VOLT COMPARISON 4 4 4 9 MEASUREMENT CONFIGURATION D 10 VOLT COMPARISON 4 4 4 10 MEASUREMENT CONFIGURATION E 100 VOLT COMPARISON 4 5...

Page 7: ...OM7520 B 00 27 September 2019 iii 6 REMOTE CONTROL 6 1 6 1 REMOTE OPERATION 6 1 6 2 REMOTE COMMANDS 6 2 ...

Page 8: ...L GUILDLINE MODEL 7520 3 1 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 4 3 ...

Page 9: ...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 Figure 1 1 Guildline Model 7520 Precision Voltage Divider The voltage divider is fully controlled by an internal micro processor through a front panel touch screen 1 2 WARRANTY Each Model 7520 Precision Voltage Divider provided includes a two 2 y...

Page 10: ...urned to Guildline for repair or replacement Warranty repairs will be provided in Canada Guildline does not provide warranty service or file claims due to shipping damage Customers are responsible for properly packaging instruments and insuring instruments to account for the possibility of shipping damage These warranties will not in any way be voided by any customer performed routine maintenance ...

Page 11: ...s The phone number in the USA and Canada to obtain Product Support Calibration Service or Replacment Parts is 800 310 8104 To Contact Guildline Instruments the following information is provided USA and Canada Telephone 613 283 3000 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...

Page 12: ... 1 100 1 0 2 1000 1 0 5 Maximum Voltages Voltage Input Terminals 1100 Vdc Reference Standard Terminals 12 5 Vdc Resistance Ratios Input3 Output 1 1 ratio direct connection to input 10 1 ratio 2 303 MΩ 270 kΩ 100 1 ratio 2 303 MΩ 43 2 kΩ 1000 1 ratio 2 303 MΩ 5 8 kΩ Communication USB IEEE 488 2 SCPI Based Language Instructions Environmental Operating Storage Temperature 21 C to 25 C 69 8 F to 77 F ...

Page 13: ...CTS Not Applicable if Self Alignment Process is run at the same altitude as the ratio measurements Any altitude effects will be compensated for by the Self Alignment Process DIVIDER RESISTANCE Divider 3 0 MΩ 0 1 Driven guard 10 0 MΩ 0 1 INPUT RESISTANCE no load on ref or output 1 1 ratio Short 10 1 ratio 2 3 MΩ 0 1 100 1 ratio 2 3 MΩ 0 1 1000 1 ratio 2 3 MΩ 0 1 OUTPUT RESISTANCE no load on ref or ...

Page 14: ...Section 1 OM7520 B 00 27 September 2019 1 6 WEIGHT 11 kg 24 lb LINE POWER 100 V 240 V 10 45 Hz to 66 Hz 60 VA ...

Page 15: ...T THE POWER LINE CORD SUPPLIED WILL PROVIDE THE PROTECTIVE GROUNDING WHEN INSERTED INTO A SOCKET OUTLET PROVIDED WITH AN EARTH CONTACT THE PROTECTIVE ACTION MUST NOT BE NEGATED BY THE USE OF AN EXTENSION CORD OR ADAPTOR WITHOUT A PROTECTIVE GROUNDING CONDUCTOR 2 3 LOCATION To ensure optimum performance the Precision Voltage Divider should be installed in an area having reasonably constant temperat...

Page 16: ...ess bar After warming up is completed the Self Alignment will start automatically Progress of the Self Alignment function is shown for each stage of the divider by a progress bar and a Self Alignment in process appears in the status bar of all screens After successful completion of the Self Alignment the bottom banner of the screens displays Self Alignment passed The Self Alignment takes about 2 h...

Page 17: ...of the voltage divider resistance chain 3 NULL DETECTOR Terminals for connection to an external null detector 4 VOLTAGE REFERENCE Terminals for connection of a reference voltage standard 5 VOLTAGE OUTPUT Terminals for connection to the outputs of the voltage divider chain 6 GUARD Terminal for connection of the internal passive guard of the voltage divider chain 7 GND Terminal for connection to the...

Page 18: ... control 3 USB INTERFACE BUS Type B connector used to connect voltage divider to external controller i e computer 4 CHASSIS Terminal for connection to the chassis tied to power line ground i e earth 5 POWER Line input voltage on off switch 6 FUSE 1 2 A Time Delay for 100 V 127 V 1 4 A Time Delay for 220 V 240 V 7 100 V 240 V AC POWER INPUT IEC Line cord to AC mains 100 V to 240 V 10 45 Hz to 66 Hz...

Page 19: ... display responds better with the use of touch screen stylus rather than a finger WARNING NEVER CHANGE OR ENGAGE A VOTAGE DIVIDER MODE OF OPERATION WHILE LIVE VOLTAGE IS PRESENT DOING SO CAN DAMAGE THE VOLTAGE DIVIDER OTHER CONNECTED EQUIPMENT AND POSSIBLY RESULT IN INJURY OR DEATH THE VOLTAGE DIVIDE CAN BE OPERATED UP TO 1100V AND THEREFORE LEATHAL VOLTAGES MAY BE PRESENT ON INPUT TERMINALS OR EV...

Page 20: ...formation for the Voltage Divider and is present in all screens of the user interface Note The first two selections are for the two different operational modes of the 7520 These two modes are the Divider mode of operation and the Comparator mode of operation The Divider selection corresponds to a straightforward voltage divider where the voltage provided on the Voltage Input terminals is simply di...

Page 21: ...o desirable when dividing down a programmable or arbitrary voltage source when not compared to a reference voltage cell This operation mode offers flexibility and simplicity to work with non decade values of voltage When calibrating working voltage references or Digital Multi Meters DMMs or Volt Meters the Divider mode is used You can touch the desired ratio button to engage the configuration The ...

Page 22: ...OULD 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 THE VOLTAGE DIVIDE CAN BE OPERATED UP TO 1100V AND THEREFORE LEATHAL VOLTAGES MAY BE PRESENT ON INPUT TERMINALS OR EVEN OUTPUT TERMINALS IF USED INCORRECTLY ...

Page 23: ...ltage button to engage the configuration The line will turn green and the Open button will turn white You should always disengage a configuration before engaging a new configuration Selecting the Open button disengage all measurement configurations and return the active green highlighted range back to white WARNING NEVER CHANGE OR ENGAGE A VOTAGE COMPARATOR MODE OF OPERATION OR RATIO WHILE LIVE VO...

Page 24: ...ate This is intended for demonstration and training purposes and should never be used for official measurements If during Non Align mode voltages higher than 25 V have been used self alignment should not be invoked for 6 hours to allow the resistor chain to cool to its nominal temperature The Self Align will invoke the Self Alignment process after the system has reached temperature stability of th...

Page 25: ...stem will remain uncalibrated until such time the alignment process has successfully completed If the alignment is attempted before the system has finished the 6 hour warm up temperature stability process the 7520 will not initiate self alignment Note The Exit button will only cancel the alignment process but the warming up process will still continue in the background If the warming up process fa...

Page 26: ...o wrong the self alignment process bar will turn red and a 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 If the problem persists the device may need to be returned to ...

Page 27: ...ed all the process bars will remain green and the bottom bar state becomes 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: ...ord When entering the Password menu you will be prompted to Current Password by this screen then press the OK button If the password is correct then you will be forwarded into the New Password screen otherwise you will be returned to the Setup menu Lastly the Cancel button exits the screen back to the Setup menu Note The operator should type in four digits for the password value 0231 2321 5633 etc...

Page 29: ...lf Alignment 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 After pressing one of the offset adjustment fields the user will be brought to a password prot...

Page 30: ...Section 3 OM7520 B 00 27 September 2019 3 14 The Logging process will take a few seconds when the Save Exit is pressed ...

Page 31: ...he parameter displayed in the grey areas The Exit function closes the screen and returns to System Parameters menu These screens are password protected and defined below The System Date screen allows changes to be made to the 7520 system date Touching the grey areas will place a cursor into the field allowing the field to be changed The OK button sets the date to the date displayed and exits the s...

Page 32: ...cel exits the screen without applying the change The System GPIB Address screen allows changes to be made to the 7520 GPIB Address Touching the grey area will place a cursor into the field allowing the field to be changed The OK button sets the address to the address displayed and exits the screen Lastly the Cancel exits the screen without applying the change By default the GPIB Address is set to ...

Page 33: ...cting the measurement The information on this display is updated once a second 3 4 6 Log Screen d The Log screen displays the five system events on each page These events include dates that the Self Alignment functions were finished and dates that the Offset values were changed Up to 51 log events are retained Older events will be deleted automatically to make room for new events as needed Note Ev...

Page 34: ...30 minutes and for the operator to remain 3 meters i e 10 feet away from the test setup or to use an EMI cage to shield the system to obtain optimal results Figure 3 4 Model 7520 Connections for Operation as a Voltage Divider 3 6 1 1 RATIO DIVIDER This configuration is used to directly output the voltage present at the Voltage Input terminals Connect the measurement components as described in Figu...

Page 35: ...as described in Figure 3 4 Configure the touch screen for the 100 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 100 Allow sufficient time for the measurement to stabilize Once stabilized the output voltage will be a 100 1 ratio value within 0 2 ppm of the input value 3 9 1000 1 RATIO...

Page 36: ...ons 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 It is best practice to allow all tests to settle for at least 30 minutes and to remain 3 meters i e 10 feet ...

Page 37: ...a 0 1 volt source to a 10 volt reference standard Connect the measurement components as described in Figure 3 5 Configure the touch screen in the Comparator menu section 3 4 3 for the 100mV comparison and enable the divider Turn on the output from the 10 volt reference connected to the Voltage Reference terminals and the output from the 0 1 volt source connected to the Voltage Input terminals and ...

Page 38: ...connected to the Voltage Input terminals and adjust the 100 volt source for a null indication on the null detector Allow sufficient time for the measurement to stabilize 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 an...

Page 39: ...The voltage divider is fully controlled by an internal micro processor through a front panel touch screen 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 4 2 LOW...

Page 40: ... the divider chain sections Both the touch screen and USB GPIB interfaces are controlled by a microprocessor which is kept isolated from the analogue circuits that are part of the voltage divider chain This high isolation ensures no noise or offsets will be present in measurements conducted with the 7520 due to heat and noise from the rest of the circuitry inside the 7520 4 4 CIRCUIT PROTECTION Th...

Page 41: ...cted to the Input Voltage The VD box refers to the internal divider section A B C D E F Figure 4 1 7520 Comparison Measurement Configurations Note In all configurations the output of the divider chain is connected to the high side red terminal of the null detector 10V Reference Standard VD IN OUT 1 1000 Null Detector UUT 0 01V 10V 0 01V 0 01V 10V Reference Standard VD IN OUT 1 100 Null Detector UU...

Page 42: ... compared to the UUT 0 1 volt source connected to the 7520 Voltage Input terminals The comparison is done via an external null detector connected to the Null Detector terminals 4 8 MEASUREMENT CONFIGURATION C 1 VOLT COMPARISON Configuration C is used for comparison of a 1 volt source to a 10 volt reference standard through the voltage divider set up for a 1 10 division The 10 volt reference connec...

Page 43: ... V reference voltage that is connected to the Reference Voltage terminals The comparison is done via an external null detector connected to the Null Detector terminals 4 12 INTERNAL RATIO ALIGNMENT The 7520 Precision Voltage Divider is designed with a fully automatic Voltage Ratio Alignment function i e Self Calibration which can be invoked from the front panel touch screen as may be desired by th...

Page 44: ...eful attention to external connections and shielding 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 5 3 ALIGNMENT Alignment consists of an internal ratio alignment No additional ...

Page 45: ...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 1 Power off the 7520 AF unit 2 Connect the PC USB to the unit s USB connector 3 While pressing on the bootloader switch apply power to the unit After 5 seconds you may stop pressing on the bootloader switch The d...

Page 46: ... 5 OM7520 B 00 27 September 2019 5 3 4 Invoke the PIC32 Bootloader Application 5 Select the USB connection Enable Checkbox 6 Connect to the 7520 AF PIC32 firmware 7 Load the 7520 AF_fRTOS X production hex file ...

Page 47: ...it 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 and ...

Page 48: ... and querying the status The GPIB interface conforms to IEEE 488 2 standard and is by default set to address 10 The USB when connected to a PC computer installs a com port commonly referred to CDC RS 232 emulation mode Both interfaces use the same commands which are SCPI based NOTE When the 7520 receives a command over the remote interface either USB or GPIB the 7520 will become under remote contr...

Page 49: ...er A B C Z a b c z string letter letter string boolean 0 1 unsigned digit digit unsigned nr1 unsigned nr3 nr1 unsigned E nr1 letter digit not to be confused with DD unsigned limited to range 1 31 MM unsigned limited to range 1 12 YYYY unsigned limited to ranges 1999 and up COMMAND COMMENT IDN query display identity of unit RST reset the instrument to a known defined state CONFigure DIVider ratio s...

Page 50: ...ce polarity polarity 0 1 0 negative 1 positive CONFigure REFerence query display the configuration reference polarity CONFigure NONALign value set the Non Align mode value 0 1 0 false 1 true CONFigure NONALign query display the Non Align mode ALIGN START initiate self alignment Note unit needs to be warmed up first ALIGN STOP cancel self alignment Note unit self alignment parameters set to default...

Page 51: ...n 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 query display the installed software version SYSTem LOCAL respond to local operation unlock local SYSTem REMOTE respond to remote operation lock out local TEMPerature TarGet query display the target temperature TEMPerature CurrenT query display the ...

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