Module Test 9-4 - Tektronix PM 101 Instruction Manual

If the Expansion Option is not present, Address Ii nes
A16-A23 and Data lines 08-015 are set to "X" (don't
care). The External Trigger is always set to "X" (don't
care).
The State Machine in the 7002 is programmed to
execute a test sequence:
IF WR1, THEN TRIGGER MAIN AND TIMING
IFWR2 ORWR3ORWR4, THEN DON'T TRIGGER
ELSE GOTO 1
The Acquisition Memory board in the 7002 is set for
Zero Delay. The Front End Qualifiers and the Clock
Shifter/Divider are programmed to default values of all
"X"s ( don't cares) according to data stored in the Per­
sonality Module ROM. After all setups are complete, a
Display command is sent and the Slow Clock Detector is
checked. A slow clock indication results in the following
error:
3 FAIL 0FF60-1
This error can be caused by an erratic or missing
PM 101 clock.
If the clock appears to be running, the Personality
Module ROM is read to determine how long to wait for a
trigger to occur. A Store command in the 7002 is sent next.
After waiting the specified length of time, the Activity
Monitor on the Acquisition Memory board is examined to
see if the Main Section has triggered and returned to the
Display mode. (All of this is occurring in the 7002.) If the
Main Section is still in the Store mode, the following error
is generated:
3 FAIL 2E803-7
TRIGGER
Failure to trigger can be caused by a failure of the
Personality Module to generate the WR1 value.
Module Test 9-4. This test involves all four Word
Recognizers, both Counters, the State Machine, and the
Acquisition Memory. The Word Recognizers remain
programmed as in sub-test 3. The State Machine is
programmed with the following test program:
The State Machine begins in state 1 and advances to the
next state as each of the four Word Recognizers occur in
order. While in state 1, the two Counters are reset. While in
state 2, Counter 1 is incremented, and while in state 3,
Counter 2 is incremented. While all of this is going on, the
Acquisition Memory is acquiring data. When Word
Recognizer 4 occurs, that single data sample is not stored
and the Main Section and the Timing Option are both
@
; SLOW OR NO CLOCK
; MAIN SECTION FAILED TO
Maintenance and Troubleshooting-PM 101
triggered. At that point, the Acquisition Memory contains
the last 16 words generated before Word Recognizer 4 and
the 240 words generated immediately after Word
Recognizer 4. If the Qualify RAM works correctly, the
Word Recognizer 4 value was not stored. Counter 1
contains the number of clocks that occurred between
Word Recognizer 1 and Word Recognizer 2, and Counter 2
contains the number of clocks that occurred between
Word Recognizer 1 and Word Recongizer 3.
The Acquisition Memory board is set for a delay of 240
clocks and the Memory Address Counter is pre-set to
0FDH. The Front End Qualifiers and the Clock
Shifter/Divider are programmed with default values accor­
ding to data stored in the Personality Module ROM. After
all steps are completed, a Display command is sent and
the Slow Clock Detector is checked. A Slow Clock
indication results in the following error message:
4 FAIL 0FF60-1
If the clock appears to be running, the Personality
Module ROM is read to determine how long to wait for a
trigger. Then, a Store command is sent. After waiting 2 ms,
the Activity Monitor on the Acquisition Memory board is
examined to see if the Main Section has triggered and
returned to the Display mode. If still in the Store mode, the
following error message is generated:
4 FAIL 2E803-7
TRIGGER
Failure to trigger can be caused by a failure of the
Personality Module to generate any one of the Four Word
Recognizer values.
Another part of sub-test 4 checksums the Acquisition
Memory. All bytes between 2:E000 and 2:E3FF are summ­
ed and the result stored. The Expansion Option Acquisi­
tion Memory is then checksummed by summing all bytes
between 2:E400 and 2:E7FF. The results of these
checksums are compared with the expected values stored
in the Personality Module ROM, and one of the following
error messages is displayed if they do not compare
correctly:
4 FAIL 3E035-X
CHECKSUM
4 FAIL 3E036-X
FAILS CHECKSUM
These messages may indicate that the PM 101 is not
always generating the correct data pattern, i.e., that one or
more channels are intermittent.
Module Test 9-5. Failure of this test indicates that the
problem is in the 7002; consult that Service manual.
; SLOW OR NO CLOCK
; MAIN SECTION FAILED TO
MAIN ACQ. MEM. FAILS
EXP. OPT. ACQ. MEM.
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