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Model 427A
Section I
SECTION
1
GENERAL
1-1.
DESCRIPTION.
1-2.
The Hewlett-Packard Model 427A is a versatile,
compact,
self-contained voltmeter.
It is capable of
making de measurements from 1 mV to 1000 volts, ac
measurements from 0. 3 туѓо 300 volts at frequencies
from 10 Hz to 1 MHz,
and resistance measurements
from 0.2 ohms to 500 megohms.
With the 01 option,
the Model 427A may be powered either by a 115 or
230 volt line or by an internal 22-1/2 volt dry cell
battery.
1-3,
The use of solid state components
throughout
gives the Model 427A both ruggedness and reliability,
Battery operation makesthe instrument
ideal for field
use or isolation from common mode ground loops.
1-4,
Figure 1-1showsthe Model427A,
and Table
1-1
contains а list of the Model 427A Specifications,
1-5.
BATTERY.
1-6.
The battery used in the Model 427A is a 22-1/2
volt dry cell,
Eveready No. 763 or an RCA
VS102.
Typical battery life is morethan
300 hours continuous
operation or 700 hours intermittent operation.
1-7.
INSTRUMENT
AND
MANUAL
IDENTIFICATION.
1-8.
Hewlett-Packard
uses a two-section eight-digit
serial number
(000-00000).
If the first three digits
(prefix) of the serial number
on your instrument do
not agree with those on the title page of this manual,
INFORMATION
change sheets
supplied with the manual will define
differences
between
your
instrument and the
Model
427A described in this manual.
1-9.
If a letter prefixes the serial number,
the
instrument
was
manufactured
outside
the
United
States.
1-10.
AVAILABLE
ACCESSORIES.
1-11.
The following accessories are available to in-
crease the test capabilities of the Model 427A.
1-12.
CABLES AND ADAPTERS.
-hp- 110014 45" test lead, dual banana to BNC
male
-hp- 11002А 5' test lead-dual banana to alligator
clips
-hp- 110034 5" test lead-dual banana to pencil
probe and alligator clip
-hp- 10111A shielded BNC female to banana
plug adapter
1-13.
PROBES.
-hp- Model 11074A 10:1 Voltage Divider Probe
extends the voltage range of Model 427А by a
factor of 10.
-hp- Model 11039A 1000:1 Capacitive Voltage
Divider for measuring voltages up to 24 KV.
-hp- Model 11096A High Frequency Probe ex-
tends the frequency range ofthe 427A to 500 MHz.
The voltage range is 0.25V to 30V.
Figure 1-2.
11096А High Frequency Probe
01791-2
1-1
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