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. Frequ~ncy Meters - Normal Use
12.
(1) Check the following pin connections on the 50 way connector:-
Pin No.
Requi red Connecti on
19
and
24
49
Open Ci rcui t, or connected to
OV
Connected to the Hold signal
(2) The Hold signal (logic level
11'
to hold) should be applied to the interface after
receiving the Print Command signal, but before the end of the next gate time
(ie 7 ms for 10 ms gate time), and should remain at logic level '1' for the period that the
_ information on the data output is required to remain unchanged. Although the outputs from
the interface will remain unchangedwhilst a Hold is applied, the counter continues its
normal measurement sequence, i.e. 'free run', This has the advantage that the next Print
Command will be given at the end of the gate time immediately following the release of the
Print Hold. This result in a more rapid measurement sequence.
From Fig.
A2.
it can be seen
..Jt a Print Command signal occurs
3
to
4
ms after an end of gate,
by which time the gate
rime for a new measurement will have commenced.
NEW GATE
TIME
I
I
I
I
I
'm,
1' - -_____
j
I
I
I
I
I
I
I
1
I
I
____
IO~~'5L
1
I
\
I
I
I
~
I
I
I
1
HOLD
MUST
BE
APPLIED
I
I--
DURING
THIS
TIME
TO STOP
-..,
. I
DATA CHANGING
AT
END
OF
NEXT
I
GATE
TIME
END OF
GATE
_ /
-
REQUIRED
~
MEASUREMENT
l'
m s
I
I
I
I
I
I
DATA
UPDATE
PRINT
COMMAND
Fig.A2
-:;~ction
4 : 99 Series Appendix 1.
Page
App 4
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