Automated Test Sequences 97
Setting up a Linear Aid
For ANSI 96, use [F1] to select LINEAR 50 or LINEAR 60. Your selection should
be based upon manufacturer specifications. If the specifications are unavailable,
use:
• 50 dB for aids with high gain and relatively low output.
• 60 dB all other aids.
If you are unsure which to choose, press [EXIT] to return to the Main Screen
and [F3] to enter the Coupler Multicurve screen. Run a full-on SPL curve at 60
dB and at 90 dB. (See Section 3.4.1 for more information.) If there is less than a
4 dB difference at any frequency between 200 and 5000 Hz, use LINEAR 50 as
your aid type. Choose LINEAR 60 for all other aids.
In ANSI 03, the full-on gain measurement is always taken at 50 dB SPL, so this
selection is not available.
Setting up an AGC Aid
Use [F1] to select AGC or ADAPTIVE AGC.
When you run the ANSI sequence on an AGC aid, you may run up to five dif-
ferent input/output curves. The frequencies that you can choose from are 250,
500, 1000, 2000, and 4000 Hz. Choosing AGC or ADAPTIVE AGC with [F1] will
result in additional selections appearing above [F2] and [F3] that let you control
the input/output settings.
Push [F2] to toggle through the frequencies. Use [F3] to turn the input/output
curve for the current frequency on or off.
Press [NEXT] to see the ANSI I/O Screen. If you haven’t yet run an ANSI test,
the I/O curve selection box will show which curves you have selected to test.
In ANSI 03, you can choose whether or not you want to change the compres-
sion controls midway through the test. According to the ANSI standard, AGC
aids should be set to have minimum compression at the beginning of the test
and maximum compression for the AGC part of the test. However, if you don’t
want to adjust the compression controls during the test sequence, you can set
the analyzer to skip the pause it usually makes in the test sequence to allow you
to adjust the compression controls.
To do this:
1. Press [MENU] to open the local menu.
2. Make sure that ANSI TEST is set to S3.22-2003. If it isn’t, change the ANSI
TEST selection and press [MENU] twice to refresh the local menu.
3. Adjust the AGC SWITCHING selection. A choice of ON will include the
pause in the test sequence that will allow you to adjust the compression
controls. A choice of OFF will remove the pause from the test sequence.
