S21 Transmission Measurement - Agilent Technologies FieldFox N9912A User Manual

VF = 0.66 corresponds to wave propagation through a polyethylene dielectric.
VF = 1.0 (default setting) corresponds to wave propagation through free space (a
vacuum).
How to set Velocity Factor
 Press Meas Setup 4.
 Then
 Then
 Then enter a value between 0.1 and 1 using the numeric keypad, then press
You can also set Velocity Factor by pressing Meas Setup 4 then
(settings).
S21 Transmission Measurements
An S21 Transmission measurement, available with option 110, is used to
measure the loss through a DUT – or cable – over a specified frequency range.
The FieldFox signal source is transmitted out the RF OUT connector, through the
DUT, and into the RF IN connector. Both ends of the DUT must be connected to
the FieldFox.
An S21 measurement is exactly the same measurement as "2-Port Insertion Loss"
in CAT Mode.
NOTE A Normalization Cal is REQUIRED when making 2-port CAT or NA
measurements.
For highest accuracy, when measuring the DUT also attach any cable or adapter
that was used in the normalization cal.
How to make an S21 Transmission Measurement
1. Press Mode then
2. Press Freq/Dist and enter
3. Press Sweep 3 then select a
4. Press Cal 5 then press Normalization. Perform normalization as explained
5. Connect the DUT and view the transmission measurement results.
When measuring very long lengths of cable, it may be necessary to increase the
sweep time. Learn how on page 24. Learn why at the FieldFox Supplemental
Online Help:
Increase Dynamic Range
Dynamic range is the difference between maximum input power to the FieldFox
receiver (without compressing the receiver), and the minimum measurable
power (noise floor). Measurement accuracy is increased when the DUT response
is at least 10 dB above the noise floor. For a measurement to be valid, input
signals must be within these boundaries.
48
Velocity factor = 1/sqrt(εr)
Port Extensions
Velocity Factor
Enter.
NA
measurement.
on page 53.
http://na.tm.agilent.com/fieldfox/help/
then S21 Transmission.
and frequency values of the
Start Stop
setting.
Resolution
Calibration
N9912A FieldFox User's Guide