Data Display Range
A graph is au to mat i cally cre ated when a sweep is run. The Start and Stop
val ues for Source 1 de fine the ex tent of the hor i zon tal (x-) axis. The ex tent of
the ver ti cal (y-) axis is de ter mined by the val ues in the Top and Bot tom fields
be neath Data 1.
The units of the y-axis are the same as the units in the Top and Bot tom
fields. If you change the units of the Top or Bot tom field, the units in the other
field will also change. See Units on page 38 for more in for ma tion on units.
We will now per form two ex am ple sweeps: a fre quency re sponse sweep,
and an am pli tude lin ear ity sweep.
Example Sweep: Frequency Response
For this ex am ple, we will mea sure the fre quency re sponse flat ness of the
2700 se ries it self. We con nect the an a log out put to the an a log in put, sweep the
fre quency of the an a log gen er a tor over the au dio range, and plot the level mea -
sured by the an a lyzer against fre quency.
First, click the New Test but ton, turn the an a log gen er a tor on, and set both
An a log An a lyzer in put chan nels to GenMon so that the gen er a tor sig nal is
sent di rectly to the an a log in put. Now click the Sweep but ton to open the
Sweep panel. The de fault sweep is a mono fre quency re sponse sweep, so we
only have to make a few mod i fi ca tions:
§
Check the Ste reo Sweep box to cre ate a ste reo sweep.
§
Change the Steps from 30 to 100 for a more de tailed re sponse.
§
The de fault range for Data 1 is quite wide, and the units are Volts.
Change the units to dBV by click ing on the ar row next to the Top field.
From the list, choose the dBV line. (Note that the units in the Bot tom
Chapter 5: Quick Guides Sweeps
42 Getting Started with Your 2700 Series Instrument
Review
To set up a sweep, you must:
§
set Source 1 to the set ting to be var ied dur ing the sweep;
§
set Data 1 to the read ing to be col lected dur ing the sweep;
§
click Ste reo Sweep if you wish to col lect data from both chan nels;
§
set the Start, Stop, Steps, and Lin/Log for Source 1; and
§
set the Top and Bot tom val ues and units for Data 1.
Once the sweep is set up, you can run it by click ing the Go but ton at
the bot tom of the Sweep panel.
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