72
FieldFox User’s Guide
NOTE
When prompted:
"Connect port 1 to port 2"
, then you can connect them
however you choose, including using the internal ECal THRU. This is an
‘Unknown THRU’.
When prompted:
"Connect port 1 directly to port 2"
, then you must connect
the ports directly together at the calibration reference plane with no adapter
or other cabling. This is a ‘Flush THRU’.
Learn more on page 73.
Simple Response Cals
Simple Response Cals are used to quickly calibrate the magnitude and phase of a
measurement using any Open, Short, or Thru component. These may be
calibration standards, but because a Cal Kit is not selected, they are not modeled.
Measurement accuracy is generally low. Use a Simple Response Cal to make
quick measurements when using a jumper cable to connect the DUT to the
FieldFox. Otherwise, CalReady is usually more accurate.
NOTE
You can perform a Simple Response Cal for either: S11, S22, or S21 AND S12.
When prompted, choose a standard based on the displayed measurements to be
calibrated. For example, to calibrate S11, connect either an OPEN or SHORT to
the port 1 reference plane.
1-port response cals are also available from the Mechanical Cal menu. Learn
more on page 75.
Normalize
uses a THRU standard or cable between port 1 and port 2 to cal an
S21 and S12 Transmission measurement (NA Mode) and a 2-port Insertion Loss
measurement (CAT Mode). In VVM Mode, this is performed using
Zero
.
How to perform a Simple Response Cal
Select the measurements to be calibrated. See the relevant Mode (NA, CAT, or
VVM) for measurement selections.
Press
Cal 5
then
Response Cal
For 1-port measurements:
o
Select either
Open Response
or
Short Response
for the port to be
calibrated. Port 2 may require an option.
o
Connect an OPEN or SHORT standard to the specified port and press
Measure
For 2-port measurements:
o
Select
Normalization
o
Connect a short, high-quality, phase stable cable between the FieldFox port 1
and port 2 connectors, then press
Measure
NOTE
With a Normalization Cal, all subsequent insertion loss measurements are made
relative to the insertion loss of the THRU cable. For example, if you use a cable
with 1 dB of loss, then after Normalization, the display will show 0 dB of loss
with this cable in place. Therefore, for highest accuracy, when measuring the
DUT also attach the cable that was used in the normalization cal.
Press
Finish
.
Connect the DUT.
