HP 11757B Podręcznik - Strona 42
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HP 11757B
Radio Setup
1. Press
.
4 RADIO SETUP 5
2. The rst item displayed reads
need only be entered if you are using a BERT to
measure recovery time to a bit error rate. Press
to see what the bit rate is set to. The
4 ENTER 5
preset value is 44.7 MHz (DS3). If you want to set
another bit rate use the arrow or data keys and press
.
4 ENTER 5
3. The display then reads
to nd the present setting. Use the
4 ENTER 5
to toggle to the termination appropriate for your
BERT, then press
4 ENTER 5
4. The display then reads
to see what the variable error threshold is
4 ENTER 5
set to. If you want to set a dierent threshold use
the arrow or data keys. Choose a threshold setting
(combined with the ERROR TERM setting) that
is appropriate for your BERT, then press
Error pulse input variable threshold is only available
in serial prexes 3235A and above.
5. The display next reads
need to set this for this test. Press the
advance to the next feature.
6. The display should read
PRESET scale factor is 1.0, and this should only be
changed if your BERT's error output is sending out
error pulses at a rate other than it is detecting them.
For instance, if the error output of your BERT is
sending one pulse for every four errors, set the scale
factor to four. To set the SCALE FACTOR press
when
4 ENTER 5
3 SCALE FACT
the
arrow key to display the factor your want,
485
then press
again.
4 ENTER 5
7. The display should now read
(Automatic Gain Control) maintains the power level
Digital Radio Testing
. This
0 BIT RATE
. Press
1 ERROR TERM
485
.
. Press
1.1 ERROR THR
4 ENTER 5
. You will not
2 ALARM POL
key to
485
. The
3 SCALE FACT
is displayed, then use
4 AGC ON/OFF
key
.
. AGC
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