Specifications

5-11
Getting Started
To Verify/Demonstrate the Capture Error Feature (Option UHJ
instruments)
To Verify/Demonstrate the Capture Error Feature (Option UHJ
instruments)
The following procedure can be used to demonstrate capturing an error, or verify that the
instrument is operating correctly in this mode. It also teaches you how to select an
alternate pattern and add errors to one half of the alternate pattern.
Procedure
For this procedure an alternate pattern is selected and errors added to pattern B.
1. The procedure assumes that the Agilent 71612 is correctly installed; all MSIB cables
are connected and the Agilent 70843 is connected back to back - pattern generator
CLOCK OUT and DATA OUT connected to error detector DATA IN and CLOCK IN.
Also connect the clock source RF OUTPUT to the pattern generator CLOCK IN port.
2. Select , then an store - for this
example select .
3. Set to then select . This sets the length of the pattern in
to 1.
4. Select then enter a pattern length of 4000 using the numeric key-
pad - press . If you press you can view the pattern on a
full screen.
5. Check that the key is set to .
6. Load a PRBS into each half of the alternate pattern as follows:
7. Set the cursor on bit 0 of half A (half A is the uppermost pattern) then select
,,.
8. Use the and keys to set the cursor on bit 0 of half B.
9. Select , , . Add errors to pattern B by
changing bits 224 and 560.
10.Select , .
11.Select and set to and to
. Note that the red Errors flag is illuminated.
12.Select and press . Note that the Bit error address
in the Error location configuration control window indicates an error in bit 224, - press
again and the address changes to 560. Note the captured error
positions depend upon the initial state of the instrument error registers. The error posi-
tions given could possibly be reversed in order.
13.End of procedure.
pattern
edit ram usr INTERNAL PATT
INTERNL PATT1
ALT PAT ON OFF ON YES
INTERNL PATT1
SETPAT LENGTH
ENTER toggle screen
INSERT REPLACE REPLACE
load block 2^13 prbs NO MODIFY
▼
goto
load block 2^13 prbs NO MODIFY
save pattern INTERNL PATT1
pattern
ALTPAT AUX USR USR ALTPAT HALF AB
B
error location
CAPTURE ERROR
CAPTURE ERROR