General Information; Instrument And Manual Identification - HP 400E Operating And Service Manual

Model 400E/EL . Section I
Paragraphs 1-1 to 1-6
SECTION I
GENERAL INFORMATION
1-1. DESCRIPTION.
1-2. The -hp- Models 400E and 400EL are versatile ac voltmeters and db
meters. Both models can be used as ac to de converters or wideband ampli-
fiers. The Model 400E is primarily intended for voltage measurements,
whereas the Model 400EL is primarily a db meter. However, both meters
indicate both volts anddb. The 400E has a linear ac scale with a logarithmic
db scale underneath, and the 400EL has a linear db scale with a logarithmic
ac scale underneath. Since the difference in scales is the only difference
between the two instruments, this manual will use the term 400E/EL in ref-
erence to both instruments.
1-3. The enclosed data sheet contains a complete description of the 400E/EL
along with a list of specifications.
1-4, INSTRUMENT AND MANUAL IDENTIFICATION.
1-5. Hewlett-Packard instruments are identified by a two-section, eight-
digit serial number (000-00000).
If the first three digits of the serial num-
ber on your instrument do not agree with those on the title page of this
manual, change sheets supplied with the manual will define differences be-
tween your instrument and Model 400E/EL described in this manual.
are prefixed with an E or G, your instrument was produced in Europe. An
E000-00000 serial number indicates that the instrument was manufactured
in England; a G000-00000 serial number indicates that the instrument was
manufactured in Germany.
1-1