3
A3 RF Functionality
E7495A/B Manual Verification
5. Press Frequency/Normalize and follow the instructions.
The junction of the 10 dB pads forms a calibrated plane. Measuring
unknowns or standards is performed by splitting the plane and
inserting the unknown or standard between the 10 dB pads.
6. Connect the 6 dB pad between the two 10 dB pads.
7. Use the marker function to verify that the measured value agrees
with the pad.
8. Repeat steps 6 and 7, using different pads in order to cover the range
of 6 – 60 dB.
Return Loss procedure
1. Press [MODE] Antenna/Cable test; Return Loss.
2. Set the Start Frequency to 375 MHz, Stop Frequency to 2500 MHz.
3. Perform the open/load and short calibration.
4. Connect a 6 dB pad to the end of the cable connected to Port 1.
5. Average/Sweep turn off averaging to clear the buffer.
6. Turn on averaging.
The best and worst return loss should be between 10 and 14 dB.
If you find a failure
• Double-check your attenuators! When you stack attenuators the
overall insertion loss is slightly higher than the sum of the values.
• Check the Port 1 and Port 2 Type-N connectors for contamination,
damage, or loose connectors.
• Reload the latest firmware.
In the event of a performance failure, you must have the instrument sent in for repair.
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