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16
VI. INSTALLATION
1. Cabinets
Two types of cabinets are available for the PM 6650:
— a bench cabinet (4/6 rack size)
—a
19" cabinet (6/6 rack size)
Refer to chapter II for full details.
1.1. Bench cabinet
Proceed as follows to fit counter in cabinet (refer to
fig. VI-1):
— Loosen Allen screws "A".
—
Press
knurled
part of quick-release
cams
"B"
so
that they hinge out.
— Slide counter into cabinet, press release cams and
tighten screws "A".
1.2. 19" cabinet
— Remove rear plastic cover.
— Fit the dark grey plastic rails to cross-bars located
at 4/6 distance from left-hand side of cabinet (refer
to fig. VI-2).
— Mount rear panel PM 9664 with four screws A (fig.
VI-3).
—
Slide counter into cabinet, press and secure release
cams.
NOTE:
If no sub-unit is used, the empty compartment
can be covered
by blank panel PM 9722 (2/6
rack size) or two blank panels PM 9721
(1/6
rack size).
1.3. Rack installation
The rear plastic cover of the 19" cabinet contains two
angular brackets for rack mounting.
Refer to fig. VI-2 and proceed as follows:
— Remove four screws 1.
— Slightly lift side plates at front and remove
plastic
plates 2.
— Mount angular brackets in the place of the plastic
plates.
— Refit side plates and secure with screws 1.
— Remove feet 3.
— Remove tilting bracket and two pivot brackets.
2. Sub-unit installation
2.1. The desired sub-unit is installed in the 2/6 com-
partment of the 19" cabinet. The sub-unit is connected
to the PM 6650 via rear panel PM 9664 and a front
panel coaxial cable.
Proceed as follows:
— Switch off power.
—
Push sub-unit into compartment until front panel is
flush with counter.
— Press and secure release cam.
—
Interconnect sub-unit output and relevant input of
PM 6650 using a coaxial cable (refer to operating
instruction of sub-unit).
3. Installing
BCD
output
unit PM 9684
and
remote
control unit PM 9685
3.1. BCD output unit PM 9684 (refer to fig. VI-4 and
fig. VI-5).
— Remove rear cover plate A.
— Plug unit into connector C.
—
Secure unit to rear panel with the two screws sup-
plied.
3.2. Remote control unit PM 9685 (refer to fig. VI-4 and
fig. VI-6).
— Remove rear plate B.
—
Plug unit into connector D.
— Secure unit to rear panel with the two screws sup-
plied.
4. Installing D/A converter PM 9687
— Remove reer cover plate A (fig. VI-4).
— Plug unit into connector C (fig. VI-7).
— Secure unit to rear panel with the two screws sup-
plied.
5. Installing oven-enclosed
oscillators PM 9680 A or
PM 9681
5.1. Model PM 6650 B can be equipped with optional
oscillator PM 9680 A or the ultra-stable type PM 9681
(refer to chapter I! for full details).
The PM 9681 can also be installed in model PM 6650 A.
5.2. Proceed as follows (refer to fig. VI-8):
— Unplug TCXO.
— Fasten oscillator box to left-hand side wall with the
four screws supplied.
— Connect
coaxial
cable
to connector
BU616
and
supply leads to earth and +12V.
— Let the PM6650
warm
up for at least 7 minutes
before measuring.
6. Mains voltage conversion and rear panel fuse
The
PM 6650 can be adapted
to two
mains voltage
ranges
as shown
in table VI-1. The
mains
voltage
selector (refer to fig. Vil-2) is operated with a screw-
driver inserted in the switch slot.
At delivery the PM 6650 is set to 230 V and provided
with a 0.5 A slow-blow
fuse in the rear panel fuse-
holder (refer to fig. VIl-2). Be sure to change fuse to
1 A, slow-blow, if 115 V range is selected!
Mains voltage
:
;
marking
range
slide switch
visible
200...260V
downwards
115V_
0.5 A slow-blow
100...130 V_
upwards
230
V
1A
slow-blow
Mains frequency range is 50 Hz to 400 Hz.
fuse
7. Internal fuses
Two more fuses protecting the power supply are ac-
cessible inside the PM 6650 on unit U6. Refer to fig.
VI-9. Both fuses are 2 A, normal.
Refer to the Service Manual
to isolate fault causing
fuses to blow.
8. Earthing
The local safety regulations prescribe how the PM 6650
should be earthed. Two ways are possible:
a) via the 3-core mains cable plugged into an outlet
with protective earth contact.
b) via the protective earth terminal on the rear panel
(fig. VII-2).
NOTE:
Use only one of these alternatives, otherwise
hum may occur.
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