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INSTRUCTION
MANUAL
Digital
Multimeter
Models
172A.
173A
OPERATING
INSTRUCTIONS
3-12
HOW TO USE THE MODEL 1722 DIGITAL
INTERFACE.
a.
Genera 1.
The Model
1722 provides
binary
coded
decimal
outputs
(8421)
and
range
control
I ines.
Outputs
are
open-collector
positive
true
unless
otherwise
specified.
This
accessory
is
available
either
"factory
installed"
or "field-installable".
The
Model
1722 consists
of
a two-layer
circuit
with
card-edge
and mating
outputconnectors,
b.
Installation.
I .
Disconnect
the
Model
l72A/l73A
line
cord
from
line
voltage.
2.
Turn
the
instrument
over
so that
the
bottom
cover
faces
up.
3.
Loosen
four
slotted
screws
on the
bottom
cover.
The screws
are
captive,
that
is,
they
cannot
be removed
completely.
4.
Turn
over
the
instrument
with
the
top
cover
facing
up,
taking
care
to hold
the
top
and bottom
covers
together.
5.
Carefully
remove
the
top
cover
to
gain
access
to
the
printed
circuit
board.
There
is one connection
between
the
top
cover
and
the
main
circuit
board
which
must
be temporarily
removed
in order
to free
the
top
cover.
6.
Remove
the
Model
1728 Rechargeable
Battery
Pack
(if
installed).
Carefully
disconnect
connectors
from
the
mother
board.
NOTE
The Models
1722 and 1728 cannot
be installed
on the
Model
172A/l73A
cnassis
at
the
same time.
7.
Check
to see
that
the
four
insulating
spacersare
in position
on the
circuit
board
as shown
in
Figure
3-Y.
8.
Place
the
Model
1722 on the
spacers
as shown
in Figure
3-9.
9.
Lift
up the
Model
1722 slightly
to gain
access
to
the
Model
172A/l73A
motner
board,
and plug
in connectors
JlOO3,
JlOO2,
and JIOOI
(in
order
given).
IO.
Connect
ground
return
wire
from
the
Model
1722 to the
extra
lug
on
transformer
TIOI.
11.
Replace
the
connections
to the
top
cover.
12.
Reinstall
the
top
cover.
13.
Turn
the
instrument
over
and
tighten
the
four
screws.
c.
Connector
Terminations.
The Model
1722 uses
two card-edge
connectors
~1006
(40-
pin)
and PI101
(26-pin).
Ribbon
cable
style
of
mating
connectors
may be used
with
these
cardedge
connectors
as shown
in Table
3-5.
TABLE 3-5.
Sumnary
of
Mating
Connectors
PI 101
~1006
Manufacturer
Crimped
Ribbon-Cable
Style
3M
3462-0000
3M
3464-0000
3-1:
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