Description; Accessory Features - HP 652A Operating And Service Manual

1 · 1 . DESCRIPTION.
1 · 2. The Hewlett-Packard Model 6 5 2A Test Oscillator is a
highly stable, capacitance-tuned
frequency range of 10 Hz to 10 MHz. The oscillator has a
sine-wave output that is adjustable from 10 microvolts to
3.16 volts into 5 0 or 600 ohms. The Model 6 5 2A Test
Oscillator is shown in Figure 1 -1, and the specifications are
given in Table I-I.
1 - 3 . Two output impedances are provided at the front panel
output connectors. The 600 ohm connector provides an
output with an impedance
transmission lines and many distribution systems. The 50
ohm connector provides an output for circuits needing a low
source impedance.
1 -4. The Model 6 5 2A Test Oscillator output voltagc is
constantly monitored at the input to the attenuator by an
internal voltmeter. The voltmeter has two scales for RMS
voltage readings, and a dBm scale referenced to 1 milliwatt
into 5 0 ohms. The metcr scale can be expanded and used to
set and maintain a reference for the output voltage, when the
MONITOR switch is in the EXPAND position. The 1 .0 volt
scale is shaded from 0. 9 to 1 .0 to denotc the expandable
area. Other voltages can be obtained using the OUTPUT
ATTENUATOR and, if desired, an external 1 dB attenuator.
1 · 5 . The OUTPUT ATTENUATOR, in conjunction with the
AMPLITUDE control, allows any output voltage from 10
Mnr'lp1 fi'::; ? A
SECTION
GENERAL INFORMATION
oscillator that has a
that is compatible with
microvolts to 3 .16 volts to be sclected, when matched into a
50 or 600 ohm load.
1·6. ACCESSORY FEATURES.
1-7. The accessory furnished with the Model 6 5 2A is the
-hp- Model 1 l 04 8 C Feedthrough Termination. It is used to
insure that the Test Oscillator is operating into the rated
impedance, in the event that the instrument is connected to a
device with an impedance greater than
s p e c i f i c ations for the
Termination arc listed below:
Terminating Resistance - 50 ohms +/·0 .2 5 %
Connectors - BNC male on one end, and BNC female
on the other end.
1 -8. INSTRUMENT AND MANUAL IDENTIFICATION.
1-9. Hewlett- Packard uses a two-section serial number. The
fIrst section (prefix) identifies a series of instruments. The
last section (suffix) identifi e s a particular instrument within
the series. If a letter is included with the serial number, it
identifies the country in which the instrument was rnanu�
factured. If the serial prefix of your instrument differs from
the one on the title page of this manual, a change sheet will
be supplied to make this manual compatable with newer
instruments or the backdating information in Appendix C
will adapt this manual to earlier instruments.
spondenc e with Hewlett- Packard should include the com­
plete serial number.
50 ohms. The
Model 1 l 04 8 C Feedthrough
All
corre�
Section I
1 -1