BEKA BA514G, Manual

Page: 20 / 33

The retransmitted RTx annunciator on the instrument
display shows the status of the retransmitted pulse
output. Annunciator activation depends upon the
setting of
5ource
in the pulse output configuration
menu.
5caled:
Annunciator activated each time pulse output
open collector is
on , i.e. Ron is less than 60 Ω
+ 3V.
direct:
Annunciator continuously activated
5.20.1 System design
The Tachometer’s pulse output is a passive circuit i.e.
not powered, but it is totally isolated from all other
Tachometer circuits, therefore terminals P1 and P2
may be connected to most other instrument with an
open collector pulse input.
Fig 8 shows how to produce a voltage pulse that could
be used to drive a remote counter. The positive
terminal of the pulse output circuit P1 is connected to
the Tachometer’s positive supply terminal 1. When an
output pulse occurs and the open collector output
‘closes’, P2 is connected to P1 and the pulse current
flows through resistor R1. The current flowing in the
circuit is determined by R1 which should be chosen to
limit the pulse output current to less than 10mA. For a
24V supply R1 should be greater than 2,200
Ω .
Fig 8 Transferring pulse output to the safe area
5.20.2 Configuration
The pulse output sub-menu which is within the
instrument configuration menu is shown in Fig 9.
For re-transmission applications the output pulse
may be a synchronous duplicate of the input pulse
by selecting
dirECt
in the
5ourCE
function.
When
5CALEd
is selected in the
5ourCE
function, two
additional functions,
diVidE
and
durAtion
are
introduced enabling the input pulse frequency to be
divided to produce the output pulse frequency, and
the output pulse width (duration) to be defined.
5.20.3 Access pulse output sub-menu:
PuL5E oP
The pulse output is configured in a sub-menu
contained in the
pul5e op
function.
Using the
&
or
*
push button scroll though the
configuration menu until
PuL5E oP
is displayed,
pressing
(
will then access the pulse output sub-
menu which is shown in Fig 9.
Fig 9 Pulse output configuration sub-menu
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