HP 651B - Page 3

Model 651B
Section I
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1-1. DESCRIPTION.
1-2. The Hewlett-Packard Model 651B Test Oscilla¬
tor is a wide range capacitance-tuned oscillator cov¬
ering a frequency range from 10 Hz to 10 MHz. The
oscillator has a stable sine-wave output signal that is
adjustable from 10 microvolts to 3.16 volts into 50 or
600 ohms< The Model 651B Test Oscillator is shown
in Figure 1-1 and the specifications are given in
Table 1-1. This manual is written for the standard
Model 651B Test Oscillator; refer to paragraph 1-7
for differences between the standard instrument and
Options 01 and 02.
1-3. Two output impedances are provided at front
panel output connectors. The 600 ohm connector pro¬
vides an output with an impedance that is compatible
with transmission lines and many distribution systems.
The 50 ohm connector provides an output where a low-
source impedance is desired.
1-4. The Model' 651B Test Oscillator output voltage
is constantly monitorai at the input of the attenuator
by an internal voltmeter. The voltmeter has two
scales for RMS voltage re^ii^s and a dBm scale ref¬
erenced to 1 milliwatt iirto 50 ohms. The OUTPUT
ATTENUATOR, in conjunction with the AMPLITUDE
control, provides a monitored output of desired level
when matched into a 50 or 600 ohm load.
1-5. AVAILABLE ACCESSORIES.
1-6. Table 1-2 contains a list of the accessories
which will increase the usefulness of the Model 651B.
1-7. OPTIONS.
1-8. OPTION 01.
1-9. Option 01 is a standard -hp- Model 651B Test
Oscillator that has the dBm scale of the output moni¬
tor referenced to 1 miiliWatt into 600 ohms. Thefront
panel OUTPUT ATTENUATOR dBm markings have
been changed to correspond with the signal level at
the 600f2 output connector (-80 to +10 DBM).
1-10. OPTION 02 .
1-11. Option 02 is a standard -hp- Model 651B Test
Oscillator that has output impedances of 75 ohms and 600
ohms. Also, the output monitor has the dBm scale
referenced to 1 milliwatt into 75 ohms.
1-12. INSTRUMENT IDENTIFICATION.
1-13. Hewlett- Packard uses 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 manualwill define differences
between your instrumentaiuitheModelSSlBdescribed
in this manual.
1-14. If a letter prefixes the serial number, the
instrument was manufactured outeide the United
States.
Table 1-2. Available Accessories
-hp- Model lOllQA, BNC to Binding Post Adapter:
Converts a BNC connector to binding post
connectors.
-hp- Model 11048B Feed-thru Termination:
Precision 50 0 feed-thru termination with male
and female BNC connectors.
-hp- Model 11004A Line Matching Transformer:
Provides fully balanced 135 or 600 output
from single-ended input.
-hp- Model li095A Feed-Thru Termination:
Precision 600 0 feed-thru termination with male
and female BNC connectors.
-hp- Model 11005A Line Matching Transformer:
Provides fully balanced 600 output from
single-ended input.
-hp- Model n094A Feed-Thru Termination:
Precision 75 0 feed-thru termination with male
and female BNC connectors. (Use with Option 02.)
01810-2
1-1