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Digital Radio Testing
1-30
press
to get the next parameter. 11 is a good
4 ENTER 5
value to enter to keep the measurement time down.
3. The second and third items will be \
and \
". These access the start and stop
2 STOP FRQ
frequencies for the notch. Press
STRT FRQ, then use the arrow or data keys to set a
value in MHz (use 45 for this example), then press
. The display should show
4 ENTER 5
Press
and set a value using data or arrow
4 ENTER 5
keys (95 for this example), then press
4. The next two items displayed are \
and \
4 STOP RATE
for S-Curve measurements and will be ignored when
making Hysteresis M-Curve measurements. Press
until the display reads \
5.
determines the number of errors that
ERROR BITS
are counted before a nal bit error rate calculation is
made. You may enter powers of 2 from 2 to 15 (4 ,
8, . . . , 32768). Press
arrow key to get 2
485
.
4 ENTER 5
6. The next displayed item is \
Hysteresis M-Curve measurement uses BOTH
phases. You do not need to select a phase because
the instrument will always choose BOTH. Use the
key to move to
495
CRITERIA
7. The Fader will then display \
indicates the decision criteria for drawing an
M-Curve. Press
4 ENTER 5
to toggle through the options: ALARM, 1E-3, 3E-4,
1E-4, 3E-5, 1E-5 and 1E-6. Unless you have opted to
use the ALARM INPUT to make the measurement,
select one of the other criteria and press
8. The display will then read \
only to Dynamic M-Curve, and will be ignored for
HP 11757B
1 STRT FRQ
to access
4 ENTER 5
2 STOP FRQ
4 ENTER 5
3 START RATE
". These parameters are used
".
5 ERROR BITS
to access and use the
4 ENTER 5
, which equals 2048. Press
11
". The
PHASE
.
", which
CRITERIA
and use the
arrow key
485
4 ENTER 5
". This applies
8 SPEED
"
.
.
"
495
.
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