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Manual Scope Execution Procedure for Depth and Modulation Measurements

This article describes how to set up and execute tests with the GRL-C3-MP-TPR Tester and Tektronix High-Performance Real-Time Oscilloscope in the manual mode

Depth and Modulation measurements of ASK packets can be verified manually using the scope. Follow the instructions below when running these measurements:

  1. Ensure proper connection between the GRL-C3-MP-TPR Tester and scope. i.e., connect AC1, V_RECT and I_RECT from the GRL-C3-MP-TPR Tester to the scope channels 1, 3 and 2 respectively using scope probes to replicate MPP signals (refer to Figure 1 below).

Note: It is not mandatory to connect to scope channels 1, 3 and 2 only. Any channels on the scope can be connected.

Figure 1: Channel-1 (AC1), Channel-3 (V_RECT) and Channel-4 (I_RECT) connections on scope

Figure 2 below shows Channel-1 (AC), Channel-3 (V_RECT) and Channel-4 (I_RECT in Calibration) connections on the GRL-C3-MP-TPR Tester.  

Figure 2: Channel-1 (AC), Channel-3 (V_RECT) and Channel-4 (I_RECT in Calibration) connections on GRL-C3-MP-TPR Tester

2. After setting up all the above connections, set the scope settings as follows:

  • Sample rate to 200us/s
  • Record length to 50M
  • Resolution to 200ns
  • For channel 1, set the vertical Scale per division to 4V
  • For channel 3, set the vertical Scale per division to 4V
  • For channel 2, set the Vertical Scale per division to 500mA
  • Set Mode to Run in Single

 Figure 3 and 4 below show the Horizontal or Acquisition setup and Single mode setup. 


Figure 3: Horizontal / Acquisition setup

Figure 4: Single Mode setup

3. Select the USB Power Delivery test case (e.g. 1.7.1) and run the test case in the GRL-C3-MP-TPR Browser App and observe Modulation for the ASK packets. Figure 5 below shows the ASK Modulation capture on the scope.

Figure 5: ASK Modulation capture on scope

4. Once the waveform is captured, measure the Mod Base Load and Depth as shown in Figure 6 and 7 respectively.

Figure 6: Mod Base Load measurement

Figure 7: Depth measurement

5. Once the test execution is completed, save the CV+ waveform on the scope and rename it.

For example, for Test ID: TD_1_7_1_MPP.PTX.POW.GUARANTEED_POWER _1- (0,0), rename as “TD_171.wfm”.