Example Sweep: Amplitude Linearity
For this ex am ple, we will mea sure the am pli tude lin ear ity of the ATS-2.
With the an a log out put con nected to the an a log in put, we sweep the am -
pli tude of the an a log gen er a tor over its full range, and plot the ra tio of the
level mea sured by the an a lyzer to the gen er a tor out put level, in dB. Any
am pli tude non-lin ear ity in the sys tem will show as a deviation from 0 dB.
First, per form a New Test, turn the an a log gen er a tor on, and set both
an a log 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 open the Sweep panel and make the fol -
low ing changes:
§
Click the Source 1 browser button, and choose ‘Analog Generator’ as
the instrument and ‘ChA Amplitude’ as the setting.
§
Change the Start value for Source 1 to 100 µV. (ATS understands the
prefix ‘u’ to stand for ‘µ’.)
§
Choose the dBg A units for Data 1 by clicking on the arrow next to
the Top field, and choosing the ‘dBg A’ line from the list. The dBg A
units (decibels relative to generator channel A) show the ratio of the
reading to the level of the analog generator, in dB.
§
Set the Data 1 Top value to 0.1, and the Bottom value to –0.1.
Click Go to start the sweep. The rang ing re lays will click as the gen er a -
tor changes am pli tude. The re sult will be a curve that de vi ates only slightly
from 0 dBg A, as shown in Fig ure 19.
Quick Guide to Sweeps Chapter 5: Quick Guides
Getting Started with ATS-2 39
Figure 18. Current
workspace after
frequency
response sweep,
showing typical
results.
To Next Page
Loading...
Need help?
General
