Chapter 9
Transmission Measurement
Introduction
The Transmission Measurement option (Option 21) provides the capability to perform
two-port measurements of passive devices over the 25 MHz to 3 GHz frequency range. The
signal source provided by Option 21 is unleveled, with a power output of approximately
–10 dBm. Figure 9-1 shows the typical signal level of the Option 21 signal source.
NOTE: Ripple can be reduced by including a 6 dB attenuator in the transmis-
sion path during both calibration and measurement.
Measuring Active Devices
Amplifiers can also be measured with Option 21, provided an external attenuator is in-
stalled between the
RF Out
port of the S332D and the input of the amplifier. The value of
this attenuator depends on the required input signal level into the amplifier. Note that the
output power of the signal source is not leveled, making it most suitable for gain measure-
ments in the linear region of an amplifier.
Calibration
Step 1.
Press the
MODE
key, select
Transmission Measurement
, and press
ENTER
.
Step 2.
Use the
Center
,
Span
,
Start
,
Stop
,
Signal Standard
and
Select Channel
soft keys
to select the desired frequency.
Step 3.
Press the
MEAS/DISP
key, and then the
Calibrate TM
soft key to calibrate the
S332D.
9-1
Figure 9-1.
Option 21 Signal Source Typical Signal Level