How It Is Measured; Instrument Operation - HP 4934A Operating And Calibration Manual

How it is Measured
1 The transmitter sends a complex signal which approximates a modem signal (16
frequencies with a known envelope shape).
2 From the received signal envelope, the receiver calculates the peak-to- average
ratio. This is compared with the known peak-to-average ratio of the transmitted
signal. A scaling factor ensures that a P/AR of 100 indicates no signal
degradation.
Instrument Operation
2,4 3 1
Use MEAS to select P/AR - there will be a 10 second delay before the HP
4934A starts measuring.
TRANSMITTER
3 Display the transmitted P/AR signal level (in dBm) in the left window using the
DISPLAY key (the TRMT indicator will be lit).
Set the transmitted level to the nominal data level using the OUTPUT
LEVEL control.
RECEIVER
4 Display the received signal level in the left window and the P/AR reading in the
right window using the DISPLAY key (the RCV indicator will be lit).
2-22 Making Measurements