HP 54750A, User Manual, Page: 129 / 478

Eye , Mask and Eyeline Mode Measurement T utorials
Making Eyeline Measurements
(HP 83480A Option 001 only)
N O T E
It is usually easiest to congure the HP 83480-series digital communications analyzer in terms of time
base , color-graded displa y , mask test, and so forth, before executing the e yeline application.
Instrument setups can be changed while eyeline is running, but observe the
following:
Ignore the message "keypress ignored, the instrument is in
remote" that shows up when you press a key . The instrument is in
remote , but it is still interpreting keystrokes . This is an instrument
rmware limitation.
When the program is running, you can halt the program by pressing:
4 STOP 5
The pattern generator returns to local so you can now change pattern
length, bit rate , and so forth.
When you have nished making these adjustments , resume operation of the
eyeline program by pressing:
4
RUN
5
T o exit the program completely , without unloading it from memory , press:
4 Shift 5 4 Lo cal 5
Y ou can now use the knob and front-panel keys at normal speed.
Note that when using 4 Lo cal 5 , you don't actually exit the program. The
program goes into an innite loop where the only thing it does is look to
see if you pressed
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
RESUME EYELINE . The only way to exit the program
completely is to cycle instrument power .
T o return to the eyeline program from this state , press:
4 Application 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
RESUME EYELINE
T o determine if the eyeline program is loaded in memory , press:
5-45