General Information; Description - HP 400F Operating And Service Manual

Model 400F /FL

1-1. DESCRIPTION.

1-2. The �hp- Models 400F and 400FL are versatile
ac and dB
voltmeters meters.
used as wideband amplifiers.
primarily intended for voltage measu rements, where­
as the Model 400FL is primarily a dB meter.
ever. both meters indicate both volts and dB.
a
40DF has linear scale with a logarithmic dB
ac
scale underneath. and the 400FL has a linear dB
scale with a logarithmic ac scale underneath.
the difference in scales is the only difference between
the two instruments. this manual will use the term
400F /FL in reference to both instruments.
1-3. Figure 1-1 shows both the Model 400F and the
Mode1400FL. Table 1-1 is a list
1-4. OPTION (400F ONLY).
Option 01 is a standard -hp_ Model 400F AC
1-5.
Voltmeter which has a dB scale that reads from -15
300 �V TO 300 V RANGES
Frequency 20 Hz
(2
±
100 �V RANGE
Frequency
300 � V TO 300 V RANGES
Frequency 20 Hz
100 IJ,V RANGE
Frequency
01795-2
SECTION
GENERAL
Both models can be
The Model 400F is
How­
The
Since
of
specifications.
Table 1-1. Specifications (Cont'd)
MODEL 400F
Accuracy: ± (% Full Scale +
40
Hz 100 Hz
2 )
±(1 + 1 )
+
60
30 Hz Hz
± (2 2)
+
MODEL 400FL
Accuracy: ±
40 Hz 100 Hz
±4
±2
60 Hz
30 Hz
±4
INFORMATION
of
to +2 instead from -12 to +2.
placed at the top of the meter face for better
resolution.
1-6. INSTRUMENT AND MANUAL
IDEN TIFATION.
1-7. Hewlett-Packard instruments are identified by
a two-section, eight-digit serial number (000-00000).
If
the first three digits of the serial number on your
not
instrument do agree with those on the title page
of
this manual, change sheets supplied with the man­
ual will define differences between your instrument
and the Model 400F /FL described in this manual.
If
1-8. a letter prefixes the serial number, the
instrument was manufactured outside the United States.
1-9. BACKDATIN G IN FORMATION.
1-10. Appendix C contains backdating information
that adapts this manual to instruments with serials
prefixed 617.
%
Reading)
1
MHz
±Cl
±(1/2 + 1/2) + 1 )
100 kHz
±(1 + 1 )
±1
%
Reading
1 MRz
±1
100 kHz
±2 +1 -8
Section
The dB scale is
2 MHz
4 MRz
2)
± (2
+
500 kHz
+0
-7
2 MHz 4 MHz
±4
500 kHz
I
1-1