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INITIAL PREPARATION
MODEL 1793/6423
h.
Connect P1008 to its mating recepticle on the
printed circuit board (J1002 on the Model 480 and
J1008 on the Models 177, 179, a 179-20A).
j.
Install the Model 1793 in the instrument so
that it rests on the plastic spacers.
The ground
clip must make contact with the upper side of the
shield on the Model 1793.
k.
Set up the DIP switch, S502, for the proper
mode of operation and timing/address as explained in
the Operating Instructions (paragraph 3-3).
1.
Install the top cover that was shipped with
the Model 1793.
This cover has a hole to accom
modate the connector of the Model 1793.
m.
Save all removed parts for reinstallation in
the event that the 1793 is to be removed at a later
date.
2-7.
MODEL 6423 INSTALLATION.
2-8.
The Model 6423 is installed internally in the
Model 642 Electrometer mainframe and is powered by
its own line operated power supply. Installation of
the Model 6423 precludes use of the Model 6422 BCD
Output and the Model 6428 Battery Adapter. Refer to
Figure 2-2 and install the Model 6423 as follows:
X
WARNING
Disconnect the line cord before removing
the case cover.
a. Turn off power and disconnect the line cord.
b.
Remove the four attaching screws and remove
the top cover.
c.
Remove and replace the back panel plate with
the plate that is furnished with the Model 6423.
(Remove the Model 6422 or 6428 if installed.)
d.
Remove the front four attaching screws from
the mother board and replace them with the metal
spacers, as shown in Figure 2-2. These spacers may
fit snugly and require use of a wrench to install
them. Take care not to cross thread or tighten them
too tight.
e.
Connect P10G8 to J1013 on the mother board.
After making the connection, place the printed cir
cuit board outside of the Model 642 so that there is
no strain on the cable and the board will be out of
the
way
during
installation
of
the
shield
and
spacers in the following steps.
f.
Place the shield on the spacers and attach
with the four screws, as shown. The printed circuit
board will not fit properly unless the shield is in
stalled with the nut plates on the bottom side and
with the hole pattern positioned as illustrated.
g. Install the four spacers into the shield.
h. Place the printed circuit board on the spacers
(component side down) and
attach
it
with
four
screws.
i. Attach the output connector (J501) to the back
panel plate using two No. 6 hex head bolts and two
No. 6 kep nuts (see Component Layout 30494D - page
6- ).
j.
Disconnect the AC power line at the mother
board of the 642 (J/P 1006) and reconnect to P1003A
of the 6423.
Connect J1003B of the 6423 to P1006 of
the 642.
k.
Set the Line Voltage Switch (S501) on the
6423 to the proper line voltage (llOV or 230V).
1.
Set up the DIP switch, S502, for the proper
mode of operation and timing/address as explained in
the Operating Instructions (paragraph 3-3).
m. Reinstall the case top cover.
n.
Save all removed parts for reinstallation in
the event that the 6423 is to be removed at a later
date.
2-9. MODEL 1793/6423 OUTPUT CONNECTOR.
2-10.
The Model 1793/6423 uses a 24-pin connector
(J501) which will interface with IEEE-488 1978 con
nector.
2-11.
An optional cable accessory is available for
interfacing the 1793/6423 with external equipment.
The Model 7008 is a 1.8m (6 ft.) IEEE Cable.
2-2
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