User manual

Operation Basics: Tutorial
2–18
WFM 90 & WFM 91 User Manual
Location. Press the right Bezel Button a few times and notice that
the location of the WIP window rotates around the four corners of
the Picture display.
Display Mode. The left three Bezel Buttons allow you to change
which display mode is shown in the WIP window.
7. Using the audio monitor
Connect the output of the audio generator to the
AUDIO IN connector
on the WFM 90 or WFM 91. Set the generator for a 0 dB tone
output. Press the
AUDIO button to select the Audio display mode.
Notice that the audio waveform is free-running and that the audio
graticule has solid lines labeled
0 dBu representing the reference
level and dashed lines labeled
–3dB representing the headroom
setting.
Reference dBu. Select
4 dBu from the Operating menu. Notice that
the amplitude of the waveform is reduced and that the graticule line
label changed to
4 dBu. Set the audio generator for a +4 dB output
and notice that the signal amplitude is returned to the reference level
graticule line.
Headroom. Select
10dB HEADROOM from the Operating menu.
Notice that the graticule scale expands so that the headroom graticule
lines are now located outside the reference level graticule lines, and
that they are now labeled
+10dB. The +10 dB setting allows signals
greater than 3 dB over the reference level to be viewed.
8. Using the amplitude alarm
Enter the Configuration menu and select the
ALARMS category.
Select
ON to turn on the Amplitude Alarm mode. Return to the
Operating menu and select
0 dBu reference level. Notice that the
portion of the audio signal exceeding the reference level graticule
lines has been highlighted. Enter the WIP display mode and notice
that the alarm highlighting is visible there as well.