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The beatnote frequency is set by the relative frequency
difference between the two sources. If you have two very
accurate sources set at the same frequency, the resulting
beatnote will be very close to 0 Hz. You may have to look
carefully at the HP 3561A's display to see a beatnote close
to 0 Hz.
On the other hand, less accurate sources may create a
beatnote greater than 100 kHz. Searching for the beatnote
will require that you adjust the center frequency of one of
the sources above and below the frequency of the other
source until the beatnote appears on the HP 3561A's display
(beatnote < 100 kHz).
If incrementing the frequency of one of the sources does not
produce a beatnote within 100 kHz, you will need to verify
the presence of an output signal from each source before
proceeding.
SPAN
" 7
dBV
10
dB
/ D I V
- 8 7
START:
00 000
A: MAG
Hz
RANGE: - 7 dBV
STATUS: PAUSED
:
:
:
:
:
:
:
:
:
s Frequency
D o m a i n
. / Time Domain .
^ f
^^2__i^: :
1 i i
0 Hz
BW: 9 5 4 . 8 5 Hz
STOP:
100 000 Hz
0-100kHz
DEFINE
START
DEFINE
CENTER
DEFINE
SPAN
DEFINE
TIME LEN
FRO AXIS
LIN
LOG
Figure 3-24. The Beatnote is Displayed in Both the
Frequency and Time Domain by the HP 3561A
3-84
Signal Source Applications
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