Chapter 2 183
Front-Panel Key Reference
Source
Normalize Key Access: Source
Store Ref
(1
→
3)
Copies trace 1 into trace 3. Store Ref (1
→
3) must be
pressed before pressing
Normalize (On). If Normalize (On)
is pressed before
Store Ref (1
→
3), the error message:
Store reference trace before turning on
Normalize is displayed in the status line, however
Normalize has been activated.
Key Access:
Source, More, Normalize
Normalize
On Off
Normalize (On) Activates the normalize function. On
each sweep, the normalized trace (Trace 3) is
subtracted from Trace 1 and the result is added to the
normalized reference level. The display shows the
result of the following calculation:
Trace 1 – Normalized Trace + Normalized Reference
Level
The trace data is normalized with respect to the
normalized reference level, even if the value of the
normalized reference level is changed. This function
remains in effect on all subsequent sweeps until it is
turned off.
NOTE Segmented sweep is not available when Normalize (On) is selected.
CAUTION Trace 1 should be in clear write mode prior to setting normalize to on.
The normalize function is most useful for applying
correction data to a trace while making a stimulus
response measurement with a tracking generator. For
example, connect the cables and a thru line, in place of
the device to be measured, between the tracking
generator and the analyzer input. Notice that the
frequency response is not perfectly flat, showing the
response of the cables, as well as the flatness of both
the tracking generator and the analyzer.
Now press
Store Ref (1→ 3), Normalize On. Notice that
the displayed trace is now flat, or normalized. The
position of the normalized trace can now be moved to a
different position on the display by changing the
normalized reference position. This may be useful if the
device to be tested has positive gain, such as an
amplifier. Now replace the thru line with the device
under test, and an accurate measurement of the gain or
loss can be made.
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