Chapter 11
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.
Transmission Measurement can also be used to make antenna isolation measurements and
repeater measurements. The signal source provided by Option 21 is unleveled, with a power
output of approximately –10 dBm. Figure 11-1 shows the typical signal level of the Option
21 signal source.
NOTE: Ripple can be reduced by includinga6dBattenuator in the transmis
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sion path during both calibration and measurement.
Measuring Active Devices
Amplifiers can also be measured with Option 21, provided an external attenuator is in
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stalled between the RF Out port of the S33xD 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
Start and Stop soft keys to select the desired frequency.
Step 3.
Press the MEAS/DISP key, and then the
Calibrate TM soft key to calibrate the
S33xD.
11-1
Figure 11-1. Option 21 Signal Source Typical Signal Level
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