HP 11757B Handbuch - Seite 37

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HP 11757B Handbuch
Digital Radio Testing
Equipment Setup
Radio Setup
1-34
1. Connect the Fader, Digital Radio, and BERT if used
as shown in gure 1-6.
2. Press
. Use the
4 MEAS TYPE 5
shows
, then press
RECVRY
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 preset
4 ENTER 5
value is 44.7 MHz (DS3). If you want to set another
bit rate use the arrow or data keys and press
3. The display then reads
to nd the present setting. Use the
4 ENTER 5
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
to display the current setting. Use the
toggle between positive and negative edge polarity
triggering. You may need to refer to the ALARM
OUTPUT of your radio, or the manual for your radio
to nd out which polarity to use. Select the polarity
and press
.
4 ENTER 5
6. The display should read
needed unless you are using a BERT for recovery to
a bit error rate, and the BERT does not put out a
pulse for each error it detects. For instance, if the
HP 11757B
key until the display
485
.
4 ENTER 5
. This
0 BIT RATE
4 ENTER 5
. Press
1 ERROR TERM
485
. Press
1.1 ERROR THR
4 ENTER 5
. Press
2 ALARM POL
key to
485
. This is not
3 SCALE FACT
.
key to
.
4 ENTER 5