Source and Receiver Power Calibration can be performed during a standard S-parameter Guided Calibration. This power cal provides the following enhancements over the standard source and receiver power calibration:
A source and receiver power cal can be performed for all PNA ports with a single power sensor connection.
Multiple power sensors can be used to cover wide frequency ranges.
The receivers are corrected automatically.
Optionally compensates for an adapter that may be used to connect the power sensor.
Source and Receiver power correction is stored to the Cal Set along with S-parameter correction.
Note: A Guided Power Calibration is not accurate when Frequency Offset Mode is enabled.
Learn more about the standard Source and Receiver Power Cals.
How to perform a Guided Power Cal
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On the following Select Ports dialog, check Calibrate source and receiver power, then click Next.
Two Cal Wizard pages later, complete the following dialog.
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Note: A Use Power Table checkbox (not shown) is available when a mmWave SMC measurement is active. Learn more. Power Cal at: Select the source port for which a Power Calibration will be performed. The source and receiver correction will be transferred to all other sources and receivers involved in the S-parameter measurements. Use Multiple Sensors NOT available with SMC measurements. Check this box to use one or more power sensors that are configured as PMAR devices. This dialog is replaced with the Multiple Sensors dialog. See following image. When "Use Multiple Sensors" is cleared (default setting), click Power Meter Settings to configure the power meter. De-embed (power sensor) adapter When the power sensor connector is NOT the same type and gender as the DUT connector for the specified port, then for optimum accuracy, extra cal steps are required to measure and correct for the adapter that is used to connect the power sensor to the reference plane. Clear this box to NOT compensate for the added adapter. Check this box to perform extra calibration steps to measure and correct for the adapter. Then select the Power Sensor Connector type and gender of the power sensor. "Ignored" does NOT compensate for the added adapter, just as if the checkbox were cleared. When this connector matches the DUT connector for the same port, then the PNA assumes that there is no adapter. Extra cal steps are NOT required and the Cal Kit selection is not available. Otherwise, select the Cal Kit to be used to calibrate at the adapter. See Accuracy Settings below. |
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Power Cal at: Select the source port for which a Power Calibration will be performed. The source and receiver correction will be transferred to all other sources and receivers involved in the S-parameter measurements. Sensor Settings Click to start the Sensor Settings dialog, used to ADD / Configure an External Device. Sensor GridSensor Select the power sensor and the associated Start and Stop frequency range. Adapter When the power sensor connector is NOT the same type and gender as the DUT connector for the specified port, then for optimum accuracy, extra cal steps are required to measure and correct for the adapter that is used to connect the power sensor to the reference plane. Clear this box to NOT compensate for the added adapter. Check this box to perform extra calibration steps to measure and correct for the adapter. Then specify the Power Sensor Connector type and gender of the power sensor. When this connector matches the DUT connector for the same port, then extra cal steps are NOT required, and the Cal Kit selection is not available. Otherwise, select the Cal Kit to be used to calibrate at the adapter. Remove Click to remove the power sensor from the list. Add Sensor Click to add a new line, then click the down-arrow to select a sensor. If a power sensor does NOT appear in the list, click the Sensor Settings button to configure a power sensor. AccuracyTolerance When consecutive power sensor readings are within this value of each other, then the reading is considered settled. Max Number of Readings Sets the maximum number of readings the power sensor will take to achieve settling. Each power reading is "settled" when either:
The readings that were taken are averaged together to become the "settled" reading. |
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Power Level Set the power level at which the Source Power Cal is to be performed. It is usually best to perform the Source Power Cal at 0 dBm because the power sensor is calibrated at that level. If 0 dBm is not achievable for your measurement, then set to the power level with the lowest level of measurement noise. |
During a Guided Power Cal, the match between the power sensor and the VNA source port is measured. The source power correction array is compensated to account for the measured mismatch. In addition, the reference receiver measurement is also compensated to account for the mismatch of the DUT.
How to turn OFF match correction:
Click Cal > Main > Correction Methods.....
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Match correction on power measurementsBy default, the Guided Power Cal applies match correction to the receiver measurements. However, you may want to turn OFF match correction in the following cases:
Clear the box to NOT apply match correction on all receivers used on this channel. The receivers are still corrected using standard receiver calibration. Learn more. Check the box to apply match correction on all receivers used on this channel. Port subset correction |
