university of central florida department of electrical engineering and
Contents
1. 18 Overview High Frequency Test System The purpose of this user manual is to assist students and other users in the complete operation of the software and its features that were developed for the interfacing of the HP 8720B Vector Network Analyzer This user manual assumes that the operator understands how to safely calibrate the Vector Network Analyzer without causing damage to the calibration standards other than normal wear Even though the calibration procedure is explained unless an experienced user shows you how to use the calibration standards properly the calibration standards should stay in the box The software was designed to be robust against invalid inputs however it is not perfect and is designed to operate with valid input parameters Procedure This section will provide step by step instructions for full operation of the software s features and data acquisition Initialization 1 Power on the HP 8720B Vector Network Analyzer VNA Connect the VNA to the laboratory s Data Acquisition System computer via the Agilent 82357B USB GPIB Interface controller A Agilent Technologies 82357 use usg 20 terface 2 Run the Agilent Connection Expert software so that the computer will recognize the presence of2. Click the appropriate button after securing a connection for each standard on the appropriate port and then click OK when finished Wait until the instrument has finished calculating to click OK in the confirmation window Calibrate Full Port Retlection Transmission Cancel This shows a Full 2 Port calibration that has completed the Reflection parameters and also has omitted the isolation 4 Click Transmission Transmission Parameters Forward Reverse Transmission Transmission Match Match Cancel For the transmission parameters simply secure a THRU connection between the test port cables This means connect the test port cables together directly if they are opposite sex optimum or use a SMA adapter to connect them together Then click each parameter one by one pausing so that the instrument may completely finish measuring the parameter before moving on to the next measurement Upon completion click OK and complete the transmission parameters Calibrate Full Port Reflection Transmission Cancel Finalize Click Finalize to complete the Full 2 Port calibration Allow the instrument to finish its calculations before clicking the OK button Calibrate Full Port VNA Application Extracting S Parameters and Generating Plots 1 After completion of the calibration process to acquire the plots as seen on the VNA click the Acquire Menu button from the main menu T
3. Note that the default address is set to the default address of the VNA This should never require alteration 4 Click the Start I O key and the connection will be enabled This completes the initialization of the interface and now the instrument may be operated from the laboratory s Data Acquisition System wa vNA Manager File Help Address Calibrate Menu Acquire Menu All of the buttons become active after initialization and a variety of operations are available from the main menu Calibration Before any accurate data can be acquired a calibration is required to shift the reference plane of the instrument to the tips of the test port cables to be used Due to the fact that this laboratory is missing a working male broadband load the calibration must be performed with the female set utilizing an SMA adapter when necessary This compromises the full 2 port calibration s phase measurements but not the magnitude readings of the S Parameters 1 From the main menu after initialization press the Calibrate Menu button to set stimulus values and type of calibration Once a calibration is completed the stimulus values cannot be changed so be sure to set the values correctly Each calibration is unique to its stimulus values Calibration Start Frequency stop Frequency 5 Start Stop 3 Center Span 511 1 Port 200 Bate 22 1 Port Full 2 Port
4. Cancel The frequency sweep of the VNA can be set either by the start and stop frequencies or the center frequency and the span of the frequency Also there is an option to set the number of data points Below the field for the number of points the incident power may be defined as well This is important for some active devices such as amplifiers Typically the incident signal is lowered so that the signal being received by port 2 isn t too large as to damage the instrument The user must then select the type of calibration which to perform After selecting either 511 1 Port S22 1 port or Full 2 port click start to begin the calibration procedure For the Full 2 Port calibration we generally omit isolation uncheck the box We don t have an isolation calibration standard and this calibration step isn t too important unless you are measuring the loss of some test cables and don t expect to see transmission data under 20 dB Isolation helps lower the noise floor level 2 A 1 Port calibration will only require the reflection coefficient calibration steps which use the 85052D 3 5mm Calibration kit A Full 2 Port calibration requires both the reflection coefficient calibration steps as well as the transmission calibration This manual will cover the Full 2 Port calibration procedure since the 1 Port calibration procedure is identical to just the first half After selecting the Full 2 Port calibration the user will be led to the ful
5. the instrument on the bus Agilent Connection Expert E mE File Edit View I O Configuration Tools Help Refresh All W Undo Properties Interactive lO B Add Instrument Add Interface Delete A Task Guide Instrument 1 0 on this PC GPIB Instrument 81208 co Tasks for This Instrument Refresh All An instrurr Refresh this instrument S 4TH SUPPORT LOA WF ASRL1 4 GPIBO A Send commands to this SA LAN TCPIPO instrument 4 USB GPIB GPIB1 Change the label me 87208 GPIB1 16 INSTA GPIB1 17 INSTR 9 usso Change properties VISA address GPIB1 1 6 INSTR IDN string HEWLETT PACKARD 8720B 0 1 02 Manufacturer HEWLETT PACKARD Model code 6720B Add a programming alias Ignore Serial number 0 Delete Firmware 1 02 General Tasks 16 Refresh all GPIB address SICL address gpibl 16 EF Add an instrument Address check More Information Auto identify 99 How do I get drivers Where can I find programming samples 52 bit Agilent VISA is the primary VISA library The highlighted area shows that the software recognizes a valid connection between the VNA and the computer via the USB GPIB Interface controller Note the address is GPIB1 address 16 GPIBO is the GPIB Controller for the Semiconductor Testing System 3 Runthe VNA Manager via the shortcut on the desktop YNA Manager VNA Manager Address GPIB 16 Start 1 0
6. UNIVERSITY OF CENTRAL FLORIDA DEPARTMENT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE HEC 406 NANO MEMS LABORATORY HIGH TEMPERATURE amp HIGH FREQUENCY TESTING SYSTEM LABORATORY USER MANUAL 4 29 2011 Overview High Frequency Test Systein ccscscsccsscccsceccscsccccsccccsceccscsscccscecens 3 PROCCOUNG S 3 3 e EE 6 Extracting S Parameters and Generating PIOts cccscsccscsccssscscsccccccscsceccccscscescccscnceseecess 9 Other Functions o5cssecis ones ve eeocenccanets 11 5 5 12 Overview High Temperature Test 5 6 13 Heater 13 Platform ASSONIDIV cccssdes secicateracanseusndondeaueusadsstadbnataeadanecadeniaiearsssedusaucsnosavnssanetreiesiareeensea sacs 14 Controller Connections Enclosure scssccescssccscceccescesccsccescescesccsccescessesscsscescesssssoncoess 15 BNC 16 season 16
7. an see terminals 7 and 8 are unused Output to heater 120 VAC BNC Extensions Since the existing BNC connections for the probes cannot extend out of the testing box the BNC cables were extended While extra BNC cables were already available in the lab Male male BNC adapters were needed and purchased to connect them Figure 23 illustrates the extended BNC connections along with the controller enclosure Procedure The following section outlines the basic operation of the High Temperature Test system 1 Power the CN7533 Controller by plugging the grey power cable in 2 Open the CN 7 Program noted by this icon fE 3 Go to the monitoring screen by selecting this icon a 4 Connect to address 1 or your custom address on any of the four I O boxes 5 You will now be presented with the following screen fEOMEGA CN7800 PV o comes ee Alarm 2 iz OUT1 OUT2 ALM maes connect 13 v 4 Be ee ev Control Input PID Parameter Alarm PV tuning Ctrl Method PID Input Type Pt100 M Pb 25 9 Alarm 1 Mode PV Offset 0 0 Run Stop Stop Unit C Ti 166 on GED p 4 own 4 Heat Cool Heat M sv 50 0 Td 41 e Mado Com Write Enable Range Hi 600 0 Ctrl Period1 20 Alarm Disable 5 Lock Status Normal Range Lo 99 9 Offset 10 0 Alarm 3 Mode Auto tuning Stop E Decimal 1 Alarm Disable U
8. er stage is mounted directly underneath the microscope and not on its original platform Since the heater s original platform did not fall squarely underneath the microscope this was required to ensure that it did SO Controller Connections amp Enclosure The figure below illustrates the manufacturer s wiring schematic for the CN7500 controller Terminals 1 and 2 power the device with terminal 1 connected to the live wire Terminals 3 4 and 5 take the RTD input The orange wire on the RTD corresponds to the resistor connected to terminal 3 The two other leads are then connected to terminals 4 and 6 Terminals 11 and 12 lead to the RS232 to RS485 converter s terminal block Terminals 9 and 10 connect to 120VAC and the heater Because the CN7500 functions as a simple switching controller Terminals 9 and 10 connect to 120VAC and the heater It is important to note that the live lead that powers the heater should be connected to the controller at either of these terminals while the neutral lead is routed to the heater than back to the other terminal For example if the live lead is connected to terminal 10 the neutral should be routed through the heater then back to terminal 9 a 485 5 aw DATA oma AC100 ae m 50 60 Hz 5VA The figure below illustrates controller in its enclosure A more complete view is shown under BNC Extensions All the connections described above are used and as we c
9. his simple menu allows you to select any parameter i e 511 521 512 S22 and view the data in any format i e Log Mag Phase Delay Smith Chart Polar Lin Mag Real or SWR Once the desired parameter and format is selected click the gather button and after the data has been gathered click Generate Graph to generate the desired plot AcquireData Phase Delay Smith Chart Polar Lin Mag Real SwA Gather Generate Graph 2 Below is an example of a graph acquired with this software This is a Log Mag plot of the 511 parameter of a high pass filter The parameter is displayed in the top left corner of the window and the title displays the format of the data The start and stop frequencies are displayed along the bottom axis and the grid spacing is displayed to the right of the title Log Magnitude Tepaning Markers Reference S11 1 O2 O03 O4 5 pt tt tt FREQUENCY 0 9049GHz VALUE 4 84326 dB ft START 0 13 GHz STOP 3GHz 3 There are five optional markers available for each plot which can be enabled by the check box This allows the user to slide the marker along the trace of the data to see the specific values of the plot 4 Anexport file feature has been added for further analysis of the acquired data Click Done from the Acquire Data menu to return to the VNA Manager main menu Click the File drop down al menu and select export Save the file as a si
10. l 2 port calibration menu Calibrate Full 2 Port Reflection Transmission Isolation Cancel From here select Reflection Transmission or Isolation The order doesn t matter however if isolation was omitted by unchecking the box in the previous menu it will already be marked as completed in this menu 3 Click Reflection Reflection Parameters Clicking Reflection directs the user to the Reflection Parameters menu where the user completes each of the reflection coefficient calibration standards readings The 511 buttons correspond to Port 1 of the instrument and the S22 buttons correspond to Port 2 of the instrument The Reflection calibration for each port requires three standards an open circuit a short circuit and a broadband load circuit Before clicking the calibration standard buttons ensure that there is a secure connection between the calibration standard and the test port cable with the torque wrench It is important to NEVER rotate the calibration standard onto the test port cable or to any connection Only rotate the threaded portion of the male ends onto the female ends without rotating either side Calibration kits are fragile and expensive They should never be used as adapters or loads in any test set and always keep the plastic covers onto the calibration pieces to prevent dirt skin grease etc from degrading the accuracy of future calibrations Also calibration standards must never be dropped
11. nu If an error message appears on the screen of the instrument press the Clear Error button on the VNA Manager main menu to clear it Overview High Temperature Test System The purpose of this part of the manual is to acquaint new users with the high temperature testing system specifically the use of the CN7500 Controller and the probe station This manual assumes the user is familiar with the probe station and wafer based testing Refer to the other lab manual on how to use the various measurement devices interfaced to the probe station In addition the assembly methodology is included to assist in maintenance Heater Assembly Because the choice was made to forgo a controller with an independent power supply the heater must be supplied with its own power This power will be supplied by 120VAC outlet In addition The RTD is mounted on the underside of the heater to maximize the area on the surface for test devices The figure below illustrates the heater assembly showing the power connections and RTD mount RTD 120 VAC Platform Assembly The figure below illustrates the stage fully assembled platform The hot plate is the equivalent to the stage in the Micromanipulator Model 6000 and includes a vacuum tube to hold the device under test in place The heater is in direct contact with the hot plate underneath it where it is connected to the controller and the 120VAC power supply It is significant to note that the hotplate disc heat
12. p file for a 1 port calibration dataset and a 2 file for a 2 port calibration dataset This file format is compatible with Advanced Design Systems ADS and can be further analyzed Other Functions 1 Asa simple test of the connection between the Data Acquisition System and the software the GetID button on the VNA Manager main menu can be used to acquire the ID of the VNA vA Manager Address GPIB1 16 Start 10 Stop 10 2 To perform functions and operations not programmed into this software the user can reference the HP IB Quick Reference and send custom commands to the VNA This utilizes the command entry line and the Send Receive buttons in the VNA Manager main menu The HP IB Quick Reference manual is located within the program directory vA Manager File Address GPIB1 16 Start 1 0 Stop VNA Application For a list of commands see the HPIB Quick Reference located within the program directory Lend ecer J Clear Error Troubleshooting Thanks to our experienced programmer Antony this software is pretty robust and has been coded to protect itself from user errors such as invalid parameter inputs If the program manages to crash press the LOCAL hardkey on the instrument followed by the PRES hardkey to reset the instrument Then close and restart the program If the instrument locks up but the software remains active click the preset button on the VNA Manager main me
13. p 40 Down 4 0 F W Version 1 60 System Alarm Disable 6 From here you can monitor the heater s current temperature and power the disc heater to the desired temperature Make sure the input type is set to Pt100 1000 Platinum RTD and Heat Cool is set to Heat 7 The red number represents the present value PV and the green number represents the SV set value Change the set value as desired Do not set it higher than 260 C as this will melt the adhesive used to attach the RTD to the heater 8 Upon selecting Run in the Run Stop menu the controller will switch to allow power to flow to the heater Set auto tuning to start 9 To view the time temperature graph select View PV Record from the top menu You will be presented with the following screen Cancel CN7800 Address a O Alarm 2 Alarm 3 Outi a a a AT OUTI 2 ALM JAME ioo a J 100 5 10 Here you can monitor the temperature of the heater Each dashed line represents one minute The heater will tend to overshoot the set value especially when set to lower temperatures but this stabilizes relatively quickly The example above shows that it took about 8 minutes from the peak value to settle down to the set value Troubleshooting Should any problem arise first ensure that all the connections to the controller are secure If the controller is not detected the communication protocol may need to be re
14. set By selecting this icon you may configure the settings manually or opt to auto detect
Download Pdf Manuals
Related Search