User`s guide

292 Agilent E5505A User’s Guide
11 AM Noise Measurement Fundamentals
Method 1: User Entry of Phase Detector Constant
Method 1, example 1
Advantages
• Easy method of calibrating the measurement system
• Will measure DUT without modulation capability.
• Requires only an RF power meter to measure drive levels into the AM
detector.
• Fastest method of calibration. If the same power levels are always at the AM
detector, as in the case of leveled outputs, the AM detector sensitivity will
always be essentially the same.
• Super-quick method of estimating the equivalent phase detector constant.
Disadvantages
• It is the least accurate of the calibration methods.
• It does not take into account the amount of power at harmonics of the
signal.
Procedure
1 Using information shown in Figure 222 and Figure 223 on page 293,
Connect the circuit and tighten all connections. If the N5500A Option 001
or N5507A is available, use one of the connection diagrams described in
Figure 217 on page 287.
2 Measure the power which will be applied to the AM detector (see Figure 223
on page 293). It must be between 0 and +23 dBm.
Figure 222 Phase detector constant AM noise setup (method1, example 1)
DUT
AM detector
Noise
input
Test set