Agilent Technologies Agilent 4396B - Manual (Page 113)

Absolute Output Level Measurement
The analyzer can show the characteristics input level versus output
level by using the absolute measurement capability in the network
analyzer mode .
1. Press 4 Sw eep 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CHAN COUP on OFF to
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CHAN COUP ON off to couple
the sweep parameters of both channels .
2. Press 4 Ma rk er 5
N NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MKR COUP on OFF to
N NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MKR COUP ON off to couple
the marker between both channels .
3. Press 4 Chan 2 5 4 Meas 5
NNNNN
B to select the absolute measurement at the B
input.
4. Press 4 Displa y 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DATA MATH [DATA]
NNNNNNNNNNNNNNNNNNNN
OFFSET . Then input the value
of the attenuator that is connected between the DUT and the B
input. In this example measurement, a 30 dB attenuator is used.
Therefore , enter 30 4 21 5 .
5.
Press 4 Scale Ref 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
AUTO SCALE if the trace needs to be rescaled.
6. The analyzer displays the input versus output power levels . The
marker shows the input and output power levels at the 01 dB gain
compression point.
7. Press 4 Displa y 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DUAL CHAN on OFF to
NNNNNNNNNNNNNNNNNNNN
ON off to display both
channel (see Figure 5-24). Note that you must subtract 3 dB from
the input value readout. This is necessary because the input signal
is attenuated by the power splitter that is between the RF OUT and
the DUT .
Figure 5-24.
Input vs . Output P ower Level at the 01 dB Gain Compression
P oint
Network Measurement Examples 5-27