COKEVA 11940C Nota de funcionamiento - Página 17

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Cokeva 11940C Operation Note

4. Set the HP 8502A Input Attenuation knob to 0 dB.

5. Adjust the HP 8754A trace to the top graticule line using the CH 1 REFERENCE POSITION knob.

Turn the CH 1 REFERENCE POSITION off.

6. On the HP 8754A, turn on the CH 1 REFERENCE OFFSET. Adjust the trace, reference line, to the top CRT graticule

using the REFERENCE OFFSET knob. The HP 8754A is now calibrated for making return loss measurements relative to

the short.

7. If an HP 8750A Storage Normalizer is used, press the following keys on the HP 8750A: [CH 1], [INPUT], [STORE

INPUT], and [INPUT‐MEM]. The displayed reference line will shift to the middle of the screen. Errors in the reflection

test set will now be normalized.

8. Remove the SMA Coaxial Short and replace it with the Cokeva 11940C probe. The displayed trace should be 16 dB

or more below the reference line at all frequencies. If the trace is less than 16 dB below the reference line, the probe

fails the test.

5‐1. SMA ROTARY JOINT INSTALLATION PROCEDURE

Figure 10. SMA ADAPTER LOCATION

Figure 11. RF Rotary Joint Mounted on Probe