Table of Contents
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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 t o 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
I 0 0 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 t o 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.
'
4 1 2 A - A - 3 0 1 8 8
Figure
1.1.
Model
412A
DC Vacuum Tube Voltmctcr
00
1
2 9 5
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