HP 70427A User Manual page 59

Getting Started
To Demodulate AM: RF AM Detector
Step 3 - Connect the cables
Before applying a signal, look at the and make sure enough
Input Atten:
attenuation is inserted so that the input to the detector does not exceed
+20 dBm.
1. The signal to be detected goes to the input SIGNAL connector.
2. The demodulated signal is taken from the AM NOISE output connector.
This output is AC coupled.
Figure 2-15 Connect Cables Diagram
2-14 HP 70427A/HP 70428A User's Guide