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Getting Started
R&S
®
UPV
102
Getting Started 1146.2078.62 ─ 09
f) The sweep variable must now be specified in the "X Axis" field. Frequency is
already preset here (as required in this example).
No other sweep variable is required; therefore, the "Z Axis" field also remains
unchanged and set to "Off".
The "Spacing" selection field is used to select the algorithm for advancing
through the sweep points. This can be done using a linear or logarithmic step
size; the number of individual sweep points ("Points") or the step size from
point to point ("Steps") can be set.
This selection field is factory-set to "Log Points"; this is the usual setting for fre-
quency response measurements.
g) The values for the start and stop frequency of the sweep must be entered in
the two fields "Start" and "Stop".
Highlighting the desired field gives it the green selection frame. The desired fre-
quency value can now be entered directly (here: 20 Hz). Pressing the ENTER
key adopts the value and adjusts the hardware accordingly.
The possible value range is given above the softkey bar. Entries outside the
specified value range are not accepted; an audible warning is issued and the
entry is changed to its permissible minimum or maximum value.
As soon as the value entry field is highlighted, all available units are displayed
on the softkey bar; additional hidden units can be shown using the >> button.
Value entry can also be completed by pressing the softkey labeled with the
desired unit; this is a particularly useful feature if a value is to be changed to a
different unit.
The value for the stop frequency is entered in the same way (here 20 kHz).
h) The number of desired sweep points must be entered in the "Points" field, 30
points are preset here. Up to 1024 points can be selected (50 points are
entered in this example). This generally provides an adequate number of mea-
sured values without making the overall test sequence too long.
Introduction to Instrument Operation Using Examples