HP 400F, Operating And Service Manual, Page: 9 / 54

Model 400F /FL
Section I
SECTION
GENERAL
1-1. DESCRIPTION.
1-2. The �hp- Models 400F and 400FL are versatile
ac
voltmeters
and dB
meters. Both models can be
used as wideband amplifiers. The Model 400F is
primarily intended for voltage measu rements, where­
as the Model 400FL is primarily a dB meter. How­
ever. both meters indicate both volts and dB. The
40DF has
a
linear
ac
scale with a logarithmic dB
scale underneath. and the 400FL 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
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
of
specifications.
1-4. OPTION (400F ONLY).
1-5. Option 01 is a standard -hp_ Model 400F AC
Voltmeter which has a dB scale that reads from -15
INFORMATION
to +2 instead
of
from -12 to +2. The dB scale is
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
instrument do
not
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.
1-8.
If
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.
Table 1-1. Specifications (Cont'd)
MODEL 400F
Accuracy: ± (% Full Scale +
%
Reading)
300 �V TO 300 V RANGES
Frequency 20 Hz
40
Hz 100 Hz
1 MHz 2 MHz 4 MRz
±
(2
+
2 )
±(1 + 1 ) ±(1/2 + 1/2)
±Cl
+ 1 ) ± (2
+
2)
100 �V RANGE
Frequency 30 Hz
60
Hz
±
(2
+
2)
±(1 + 1 )
MODEL 400FL
Accuracy: ±
%
Reading
300 � V TO 300 V RANGES
Frequency 20 Hz 40 Hz 100 Hz
±4 ±2 ±1
100 IJ,V RANGE
Frequency 30 Hz
60 Hz
±4
±2
01795-2
100 kHz
±1
1 MRz
100 kHz
+1 -8
500 kHz
+0
-7
2 MHz
500 kHz
4 MHz
±4
1-1