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2.8 OPTIONAL PULSE OUTPUT
The BA364D can be supplied with an isolated
retransmitted pulse output which may be used to
operate remote instrumentation. The pulse
output is only functional when the BA364D is
programmed as a counter with an ‘A : b’ input
count mode (Input A + Input B). See section
2.5.4
This output is a polarised current sink so current
will only flow in one direction. Terminal P1
should be connected to the positive side of the
supply.
Ron
=
60
+ 3V
Roff
=
1M
See section 1.9.6.1 for details of intrinsic safety.
2.8.1 Programming and adjustment
The main counter programme menu is extended
as shown in Fig 2.7 to accommodate the re-
transmitted pulse output calibration functions.
How frequently a pulse is generated is defined by
the ‘diUidE’ function. When set to 1, an output
pulse will be generated each time the least
significant digit of the total display is incremented.
This may be reduced in multiples of 10. e.g. if
‘diUidE’ is set to 1,000 the least significant digit
must be incremented 1,000 times before an
output pulse is generated.
Output pulse width is determined by the
‘durAtion’ function which allows the width of the
output pulse, and the minimum time between
pulses, to be set between 2.5ms and 500ms.
The re-transmitted output pulse is not
synchronous with the input pulse. If the two
pulse output functions are set such that there is
not enough time for the BA364D to output the
required number of pulses in real time, they will
be stored and output as quickly as possible.
If the instrument power supply fails or is
disconnected, any untransmitted output pulses
will be lost.
Fig 2.7 Pulse output menu
