In order to calibrate the RI8604 80 GHz TestSet TIM, a Keysight N1913A Power Meter with a Keysight E8486A Power Sensor must be installed along with the 80 GHz Diag/Cal Interface plate. Prior to calibration, a '.gzp' with the CalKit Definition and Power Sensor calibration data must be imported into Guru. This '.gzp' file is on the supplied USB stick.
Steps to Prepare the Power Meter:
- Connect the power sensor to the power meter.
- Confirm that the power meter is set to the correct AC voltage (120/220) and connect the power meter to the AC mains.
- Connect the power meter's GPIB cable to the tester's GPIB instrument pod. (If a GPIB handler pod exists, do NOT connect to the handler pod.)
- Turn on the power meter.
- Ensure the power meter is set to the correct GPIB command set:
- On the power meter, press the System button.
- Choose Remote Interfaces > 2 of 2 > Command Set > If it is not HP437B, select HP437
- Ensure the power meter is set to the GPIB address 20 as follows:
- On the power meter, press the System button
- Choose Remote Interfaces > GPIB Address > 20. If it is not '20' then manipulate to the GPIB Address enter 20 and then press Enter.
- Press the Display button to change the Power Meter back to display the power level measured, .
- Connect the Power Sensor's N connector to the power meter's cal port and zero-cal the power sensor as follows:
- Press the Cal button (on the far right of the power meter).
- Select Zero + Cal
- Add the power meter to the tester's configuration as follows:
- On the tester, if the main Cassini window is not already open, choose ShortCut and select the latest from the list.
Note: Calibration Test Plans require the latest software, even if a different ShortCut is used in production.
- Open a configuration panel by choosing System > Tester from the main Cassini window.
- In the configuration panel's menu, choose Instrument > Add GPIB Instrument
- Choose HP437B then choose Select.
- The system will prompt for a Instrument Name, enter Pmeter77GHz (case sensitive) and press OK.
IMPORTANT: Instrument Name is case sensitive, enter it exactly as show with Upper Case "P", "G", and "H".
- The system will prompt for a GPIB Address, enter 20 and choose OK.
- Import Calibration Data for the mmWave power sensors:
- In the configuration panel, highlight the Pmeter77GHz.
- Choose Instrument > Calibration > Import from the Configuration Window menu, then choose Yes from the Please Confirm prompt.
- Highlight the appropriate sensor in the list and choose Select.
- Latch the Cal/Diag plate on the tester by placing the plate on the testhead and twisting the Fixture switch to Latch.
- Perform a system check by choosing System > Check from the main Cassini window.
- Confirm the Fixture appears in the configuration window.
Steps to Prepare the Cal Kit Definition:
- Choose a cal kit by choosing Instrument > Add Cal Kit from the Configuration window.
- Choose the proper Cal Kit from the list.
- Confirm the CalKit appears in the Configuration window.
- Verify the serial numbers match the items in the Cal Kit before starting by selecting CalKit form the list and choosing Instrument > Calibration > Inspect. (See Calibration Kit Maintenance)
Figure 1: The 80 GHz TIMs must use the modified waveguide supplied with the 80 GHz Calibration Kit.
Figure 2: The 1.5 inch waveguide piece should remain permanently mounted to the power sensor and should be considered as part of the sensor.
Loading the Correct Cal List:
If the 80 GHz test set is permanently installed, then the Cal List will be saved to the system configuration and accessible from the Tester > Calibrate menu. If the 80 GHz TIM is transient (sometimes installed, sometimes not), then the Cals might be in a separate cal list. To access this alternative Cal list:
- Choose System > Tester to open the configuration window.
- In the list of instruments, select the instrument called System and choose Calibration > Calibrate from the right mouse button menu or the Instrument menu.
- It will open a Choose a Calibration List window. (See Figure 2.1)
- Select "RI8604A 80 GHz TIM w Src1-2 Cal" from the list and choose select button. (See Figure 2.2)
Calibrating the RI8604 80 GHz Test Set:
NOTE: Always run "Cal" and "Validate" Test Plans together. All 19 Test Plans must be run to have a valid Cal. If a Validate Test Plan fails, every selected Test Plan must be run again. This is the primary reason to select Test Plans in small groups. If the operator has to abort the Calibration procedure, choose System > Reset from the main Cassini window to reload the last valid calibration data before proceeding.
NOTE: The exact cal plan names may be slightly different, depending on your tester's configuration. For example, your plan may not have 'SrcSw' at the end. However the process is the same for all variants.
Select the first three calibration steps starting with "Ri8604A..." and choose Run > Selected.
When requested, connect the RF Power sensor directly to Port W1 of the 80 GHz TIM.
Please mind the sensor orientation. The rectangular waveguide on the fixture block should align with the waveguide on the sensor. If the power sensor is turned 90 degrees, the waveguide will not be properly aligned and all calibrations will fail.
Attach the power sensor and choose OK to proceed.
Note: The next 12 calibration Test Plans will require the same connection to the Power Meter, please do not change anything while running.
When finished, select the next two calibration steps "... Port1 Rcv Freq..." and click Run > Selected.
When finished, select the next two calibration steps, "... Port1 Src Linearity..." . Click Run > Selected.
When finished, select the next two calibration steps, "... Port1 Rcv Frew Resp..." Click Run > Selected.
When finished, select the next four calibration steps, "... IM Src..." Click Run > Selected.
When finished, select the next two calibration steps, "... Port1 Atten...". Click Run > Selected.
For the next Test Plans, the operator is asked to connect the Waveguide Cal standards for the EA Calibration and Validation.
Pictured (left to right): TERMINATION, 3/8 short (when 1/4" is attached to 1/8" Short), 1/8" short.
Select the next two calibration steps, "... Port1 ea Cal". Click Run > Selected.
When requested, connect the 1/8 short to Port 1 of 80 GHz TIM as seen on the picture below.
Choose OK to proceed.
When requested, connect the 3/8 short to Port 1 of 80GHz TIM as seen on the picture. Note the addition of the 1/4 wavelength shim in the stack. Also please mind the orientation of the shim. Its rectangular waveguide must align with the cal block's waveguide. If it is turned 90 degrees, then the cal will be invalid.
Choose OK to proceed.
When requested, connect the Termination to Port 1 of 80GHz TIM as seen on the picture.
Choose OK to proceed.
When the '... Validate' Test Plan runs, the operator is requested to connect the Termination (do not change anything), press OK to continue.
Next, the operator is requested to connect the 3/8 short (see Figure 16), press OK to continue.
The next Test Plans deal with the Port 2 Calibration and Validation. The operator is asked to use waveguide loop to connect to either a TIM port or power meter.
See Figure 21 and Figure 22 below:
Select the final two calibration Test Plans (... Port2 Rcv Freq Resp...), choose Run > Selected
When requested, connect the RF Power meter, thru waveguide loop, to Port 1 of the 80GHz TIM as seen on the photo below. Please mind the waveguide orientation so that rectangular holes should be connected from TIM port, to waveguide cables, to power meter sensor. Use an appropriate spacer under the power sensor so as to keep the loop properly oriented.
Next, the operator is requested to connect Port 1 and Port 2 using the same waveguide loop. Try to not flex the waveguide loop. Loosen the loop from the cal block to provide some flexibility, connect the thru line between the loop and the block, and tighten everything.
The last 2 Operator Requests of the Validation Test Plans require the operator to do the same 2 steps in reverse.
The Calibration procedure is complete after the last "... Validation" testplan completes with a state of "Success."
If additional RI8604 TIMs are in the configuration, the steps above are repeated, but the Test Plan name is appended with TH77# (where # is 2, 3, 4, etc...).