Model
4 12A
1-1.
INTRODUCTION.
Section
I
SECTION
I
GENERAL
INFORMATION
1-2.
The Hewlett-Packard Model
412A/AR
DC
Vacuum
Tube Voltmeter is
a
multifunction instrument which
measures the entire range
of
dc voltages, current, and
resistance normally encountered in electronic equipment.
1-3.
The Model
412AIAR
measures dc voltage from
1.0
mV full scale to
IO00
V full scale in thirteen ranges
arranged in a
1,3,
10
sequence. Voltmeter accuracy is
1%
of
full scale. The input circuit
is
isolated from the case and
from
power line ground.
14.
The Model
412AlAR
measures positive
or
negative dc
current from
1.OpA
full scale
to
1.0
A
full scale with an
accuracy
of
2%
of
full scale. Current ranges are also in a
1,
3,
10
sequence.
1-5.
Resistance measurement capability
of
the Model
412AIAR
is
from
1.0
ohm center scale
to
I00
megohms
center scale in nine decade rangcs. Resistaiicc nieasureiiieiit
accuracy
is
5%
between
.3
and
3
on
the resistance scale.
16.
The Model
412AIAR
has
a
dc aiiiylifier output
voltage proportional to the input. Ainplificr giiiil is froiii
-1000
to
t1000,
depending on range selected.
1-7.
SPEC1
FlCATlO NS.
1-8.
Complete specifications
for
the dip- Modcl41
2AIAR
are listed in Table
1-1.
1-9.
INSTRUMENT AND MANUAL IDENTIFICATION.
1-10.
Hewlett-Packard uses
a
twoscctioii cigltbdigit scrial
number
(OOO-00000).
If
the first tlircc digits
of
tlic
scrial
number
of
your instrumcnt do not agrcc witti thosc
on
tlic
title page of this manual, changc sliects supplicd
with
tlic
manual
will
explain the diffcrenccs bctwccii
your
instrument and the Model
412AIAll
dcscribcd
in
lliis
manual.
'
412A-A-30188
Figure
1.1.
Model
412A
DC
Vacuum Tube Voltmctcr
00
1
295
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