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h
cy
P
Y
4b
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Model
4
12A
2-1.
INTRODUCTION.
SECTION
II
IN
STACLATIO
N
2-2. Tliis section contains instructions necessary for
installation
of
the Model 412AIAR
DC
Vacuum Tube
Voltmeter. Included are initial inspection procedures,
power and grounding requirements, installation
information, and instructions for repackaging for shipment.
2-3.
INITIAL INSPECTION.
2-4.
This
instrument was carefully inspected both
mechanically
and
electrically before shipment. It should be
free
of
mars or scratches, and in perfect electrical order
upon receipt.
To
confirm this, the instrument should be
inspected for physical damage
in
transit.
Also
test the
clcctrical
performance
of
tlic instrument, using the
procedure outlined in Paragraph
5-5.
If
there is damage or
deficiency, see tlic warranty on the inside front cover of
this manual.
2.5.
POWER
REQUIREMENTS.
2-6.
The Model 412AIAR can be operated from any
source
of
115
or
230
volts at
50
or
60
Hz.
The
115/230
V
slide switch
on
the rear panel selects the desired voltage.
Power dissipation is approximately
35
watts.
2-7.
G
R
0
U
N
D
I
NG
REQUl
R
EMENTS.
2-8.
To protect operating personnel, the National
Electrical Manufacturer’s Association
(NEMA)
recommends
that tltc instrument panel and cabinet
be
grounded. This
instrument is equipped with a threeconductor power cable
wluch, when plugged into an appropriate receptacle.
grounds the instrument. The offset pin
on
the connector is
tlie ground wire.
2-9.
To
preserve the protection feature when operating the
instrument from a twocontact outlet, use a threeprong
to
two-prong adapter and connect the green pigtail
on
the
adapter to ground.
NOTE
Operating the Model 412A/AR without
grounding the third (power line ground)
wire
of
the power cable will result
in
a
zero offset
of
the meter and oscillation
of
the pointer.
2-1
0.
INSTA
1
LATlO N.
Section
I1
2-1
I.
The Model 412A is intended
for
use
as
a
bcncli
instrument, having a top-mounted handle and rubbcr fcct.
2-12. The Model 412AR is intended for rack mounting.
Front panel height
is
5-7/32 inches.
2-13.
REPACKAGING
FOR
SHIPMENT.
2-14.
The following paragraphs contain
a
general guidc for
repackaging
of
tlie instrument. Rcfcr to Paragraph
2-15
if
the original container is
to
be
uscd;
2-16
if
it
is
not.
If
you
have any questions, contact your
local
-lip-
Salcs
and
Service Office. (SCC Appendix
B
for office locatiwis.)
NOTE
If
the instrumcnt is to be sliippcd
to
I
Icwlctt-i’ackard for scrvicc
or
repair.
attach a tag to tlic instrumcnt idcntifying
the owncr and indicating tlic scrvicc
or
repair
to
be accomplislicd. lncludc tlic
model number
of
tltc instrumcnt.
In
any
corrcspondcnce, identify tlic instrumcnt
by modcl numbcr, scrial numbcr prcfix,
and scrial numbcr.
2-15. Place the instrumcnt
in
original conhincr with
suitable packing material and
scat
wcll
with strong tapc
or
metal bands.
If
original containcr
is
not aviilablc, onc
CBR
be
purchased from your ncarcst
hp
Salcs
and
Scrvicc
Office.
2-16.lf original container
is
not to hc uscd, procccd
as
follows:
a. Wrap instrument
in
hcavy
papcr or plastic hcfurc
placing in an inncr containcr.
b.
Place packing material around a11
sidcs
of
instrumcnt and protcct panel facc
with
cardhturd
strips
.
c. Place instrument and inncr containcr
in
a hcavy
carton
or
wooden box and scal wcll with strong
tapc
or
metal hands.
d. Mark shipping containcr
“DI~LICATE
INSTIWMENT,”
“FRAGILE,” ctc.
00
1
29-5
2-1
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