Solartron Mobrey 3595 4C, User Manual

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IMP Commands 3595 4C User Manual Part Two
1-12
35952350 (CH01/AA)
Table 1.5: Mode Codes for IMP type 2A (Digital)
Code, m Mode Set Comments
000 Skip
700 Digital status
Event count totalise:
740
741
742 -ve going edge.
+ve going edge.
+ve or -ve going edge. On receipt of a measurement trigger, keeps a
continuous count of events. This count may be
cleared either by the CL command or by setting the
channel mode again to event count totalise.
Event count increment:
750
751
752 -ve going edge.
+ve going edge.
+ve or -ve going edge. A continuous count of events is kept since the last
trigger. On receipt of the next trigger, the event count
is stopped, the result is sent to the PC, and another
event count is begun.
Event capture:
760
761
762 -ve going edge.
+ve going edge.
+ve or -ve going edge. Enabled by EV command only.
800 Switch output off (high)
801 Switch output on (low)
For digital output, sets channel to logic ‘1’ or ‘0’.
Frequency Measurement:
900
901
902
903 gate time = 10ms.
gate time = 100ms.
gate time = 1s.
gate time = 10s.
Multiple periods:
910
911
912
913 1 period.
10 periods.
100 periods.
10000 periods. Returns the time over which periods are counted.
Measurement starts on the negative-going edge.
‘One-shot’ time:
920
921 -ve going start, +ve going stop.
+ve going start, -ve going stop. Measures -ve pulse width.
Meve pulse width
Note: -ve edge refers to a negative-going edge, a transition from high to low.
+ve edge refers to a positive-going edge, a transition from low to high.
Event Count This facility permits a number of events to be counted. The events (transitions) to be
included in the count can be +ve, -ve or both. Two types of count are offered: increment or
totalise. These operate as follows:
Increment . On receipt of a measurement trigger, an event count is started. Then on
receipt of another measurement trigger, the event count is stopped. The result is sent to
the 3595 4C Interface card and another count begins.
Totalise . On receipt of a measurement trigger, events are counted until an HA (halt)
command is received or until the channel mode is set to Event Count Increment. In the
latter case, the counter is cleared prior to starting the incremental count. If a CL (clear)
command is received at any time, the event counter is reset to zero. A new count is started
on receipt of the next measurement trigger. The event counter of a particular channel is
also cleared when that channel is set again to the totalise mode.
The maximum number of events that can be recorded per channel by the event-counting
circuitry is 16,777,215, after which the rolls over to zero. No indication of this is given.