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7. Additional Setup & Calibration for ITC-79-FTF-DIV only:
The ITC-79-FTF-DIV takes the incoming pulses (frequency) and provides a 50% duty
cycle square wave output that is divided by an adjustable division factor. The
division factor can be in the range of 1 to 65535 and is encoded in binary on the
jumper strip H1. Position H1-1 carries the weight 1, H1-2 equals 2, H1-3 equals 4,
all the way to H1-16 which equals 32768. As division by 0 is invalid, the output
will stop if no division factor is set up on H1.
Example: to divide the input by 1000 the jumpers on H1 must be set as follows:
H1-1
out
H1-5
out
H1-9
in
H1-13
out
H1-2
out
H1-6
in
H1-10
in
H1-14
out
H1-3
out
H1-7
in
H1-11
out
H1-15
out
H1-4
in
H1-8
in
H1-12
out
H1-16
out
The jumpers that are inserted carry the binary weights of 8+32+64+128+256+512 which
when added together, results in 1000.
Output Selection:
The ITC-79-FTF-DIV can be configured as a 'straight through' instrument or a divider
or a combination of both. Jumpers H4-1,2,3 control the relay output and jumpers H4-
4,5 control the TTL output. The following tables show how the different jumpers
affect the operation of the outputs:
Relay
TTL
Output
H4-1 Relay & 24 VDC follow input directly
H4-4 TTL Output follow
input directly
H4-2 Relay & 24 VDC driven by divider
H4-5 TTL
Output
driven
by
divider
H4-3 Relay & 24 VDC is same as TTL output
(depending
on
H4-4,5)
