Philips 6652C - Page 56

When triggered mode (TE1) has been selected, the
counter makes all necessary preparations for a
measurement
(status 17) and then waits (status
19) for either a group execute trigger (GET)
command via the bus or code "X" (execute).
If a GET command is received the counter will
after a shor t delay synchronize with the input
signal and start the measurement. If, however ,
an
"X" is received, the counter will go through
the preparation for measurement once again and
then start the measurement.
Sending an
"X" will result in a small delay
(approx. 5ms) compared to the GET command.
The output phase (status 0, 64 or 96) terminates
the measuring cycle. "Output" means output to
both the display and to the IEEE-488 bus, if re-
quested by the controller .
There
are 3 different output states :
-
Status 0 indicates a normal output without
service request ( "SQ~") •
- Status 64 indicates a normal output with
service request (ttSQ1").
-
Status 96 indicates limit alarm together
with service request ("SQ2" or "SQJI•).
Deviations from the normal measuring cycle are
found when performing:
- Hold-off, measuring time and trigger level
readings.
- Tests 1 through 6.
Totalize A, Manual gating.
- High Speed Dump mode output.
Hold~off , Measuring time, Trigger levels
The reading of hold-off, measuring time or trig-
ger levels results in the measuring cycle shown
in fig. 5.6.
The normal output phase has status 8 and when
SRQ is sent (nSQ1 •• is programmed), the status is
72. Limit monitoring, when selected (nSQ2" or
"SQ3
11
) is ignored in these measurements.
Status message Binary
Measuring and computing 00011010
Ready for output 00001000
Ready with service req. 01001000
Table 5. 6
Decimal
26 busy
8 }
72
ready
Fig . 5,6 Measuring cycle: HOLD-OFF, MEASURING
TIME or TRIGGER LEVELS.
Tests 1 ... 6
The measuring cycle when performing self-tests
1 ••• 6 (TS1 ••• TS6) is illustrated in fig. 5.7.
Fig. 5. 7 Measuring cycle: TEST.
When the test is finished, the status byte con-
tains 7 (without SRQ), 71 (with SRQ) or error
codes 97 ••• 100 (with SRQ). If an error occurs, a
mandatory SRQ is sent to the controller, even if
the service request is disabled ("SQ!Il").
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