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
Press Cal 5 then
For 1-port measurements:
For 2-port measurements:
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.
72
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.
VVM) for measurement selections.
Response Cal
Select either
Open Response
o
calibrated. Port 2 may require an option.
Connect an OPEN or SHORT standard to the specified port and press
o
Measure
Select
Normalization
o
Connect a short, high-quality, phase stable cable between the FieldFox port 1
o
and port 2 connectors, then press
or
for the port to be
Short Response
Measure
FieldFox User's Guide