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h
cy
P
Y
4b
4
J
Model 4 12A
2-1. INTRODUCTION.
SECTION
I I
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 t o 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 o r 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 t o 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. M a r k
shipping containcr
"DI~LICATE
INSTIWMENT," "FRAGILE," ctc.
00
1
29-5
2-1
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