HP 3484A Operating And Service Manual page 15

L
Model 3484A
J4
Section II
SMALL PRINTED
Cl RCUIT BOARD
WITH CABLE
Figure 2-2. Isolated Remote Option Installation.
c. Route input lead from Oluns Converter under
outer row of right-angle pins of connector J2, and
connect to Attenuator Assembly Al at point
indicated in Figure 7-3, Al Component Location
drawing.
d. Turn RANGE switch fully clockwise to 100 mV
range. Remove knob by loosening the two set
screws.
e. Remove RANGE switch mounting nut and care-
fully slide the switch
as far as possible toward the
rear of the instrument.
f. Rotate the counterclockwise limit stop one
position counterclockwise
as
indicated in Figure
2-3.
g. Replace switch carefully so that stop stays in
position. Replace mounting nut.
h. Install new RANGE knob supplied. Orient knob so
that 100
n
range is opposite marker on front
panel and secure with two set screws.
i.
Four wires from RANGE switch are connected to
pins labeled
A, B,
C,
0 near front
center of
bottom side of printed circuit board. Move all four
wires to the set of pins farthest from front edge of
board. Make certain that wires are kept in the
same order.
COUNTERCLOCKWISE
STOP POSITION
Without
Ohms
j. Set FUNCTION switch to VOC and remove knob.
k.
Remove FUNCTION switch mounting nut and
carefully slide the switch as far as possible toward
the rear of the instrument.
l. Rotate clockwise
limit stop one position clockwise
as shown in Figure 2-3. Make certain that the
counterclockwise stop is in the correct position. If
the AC Converter option is also being added, this
stop should be rotated two positions counter-
clockwise.
m. Replace switch carefully so that stops stay in
position. Replace mounting nut.
n. Two FUNCTION knobs are supplied with Ohms
Converter Option, Model l l l 52A. -hp- Part No.
5060-5953 should be used if instrument does not
have ac converter, and Part No. 5060-59 54 if
instrument does have ac, or if it is also being
installed. Select and install correct knob, orienting
so t hat
voe
is opposite marker on front panel.
Secure knob with two set screws.
o. Replace top guard cover.
p. Perform Ohmmeter Accuracy Check given in
Paragraph 5-11.
FUNCTION SW I TC H
With
Ohms ---;>..-~
®
~
With Ohms?<=--'< With AC
COUNTER CLOCK WI SE
.__._
....
/
RANGE S WI T CH
Without Ohms Without AC
CLOCK WI SE STOP
POSITION
COUNTERCLOCKWISE
STOP POSITION
Figure 2-3. Location of Switch Limit Stops.
'4 8 4A - ll - 3 0 38 i
2-3