Operation
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© 2017 Pico Technology
pv106ug r1
Restart the software using the selection in the drop-down menu under
Tools
Switch the VNA off and on again (using the switch on the back) when prompted to do so
Wait until the front panel lights have stopped flashing
Click
OK
to complete the software restart
Recalibrate the instrument
You should rarely see a ‘No Response’ message. If it happens often, check that the PC is not running other
applications and that the VNA software is not running as a background task when the sweep is on.
6.2
Calibration
The instrument must be calibrated before any measurements can be carried out. This is done by loading a
previous calibration (see
File
menu) or carrying a fresh calibration by clicking
Calibration
in the main
window, which brings up the
Calibration
window as shown here:
Instrument calibration is carried out through the Calibration window. Before starting calibration select the
preferred enhancement settings (bandwidth and averages).
Note:
The frequency sweep is set by entering the start, stop and selecting the number of sweep points.
Alternatively, by entering the centre frequency and span after clicking on the
Centre/Span format
option
box.
The table below summarizes the calibration types available together with the standards required to
complete the calibration. For best overall accuracy, particularly when measuring low isolation devices with
poor return loss values, a 12-term calibration should be performed.
S
11
S
21
S
11
+ S
21
12 terms (insertable
DUT)
12 terms or 8 terms*
(non-insertable DUT)
Minimum
calibration
standards
required
Matched load
Open
Short
Through
connection
Termination (see
text)
Matched load
Open
Short
Through connection
Matched load (x 2)
Open ( x 2)
Short (x 2)
Through cable
Matched load (x 1)
Open ( x 1)
Short (x 1)
Through adaptor (x
1)
Through cable
