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100 kHz
10 kHz
1 kHz
100 Hz
10 Hz
4 Hz
250 Hz
25 Hz
2.5 Hz
.25 Hz
0.025 Hz
0.01 Hz
4 msec
40 msec
400 msec
4 sec
40 sec
100 sec
Span Width Setting
When viewing the frequency domain display, keep in mind
that the first major graticule on the HP 3561A's screen
represents 10% of the span width.
Frequency of Each Cycle
When viewing the time domain display, you can determine
the frequency of the beatnote by multiplying the number of
cycles appearing across the HP 3561A's screen by the
appropriate Frequency of Each Cycle value from the chart.
For example, to tune the beatnote to within 5 Hz you can
use the 1 kHz span width setting by reducing the beatnote
frequency until the time domain display is showing two
cycles or less across the screen:
Number of Cycles X Frequency of Each Cycle = Beatnote Frequency
2 cycles x 2.5 Hz = 5 Hz
HP 3561A Time Record
Note that the higher the span width setting that you are in
is, the faster the HP 3561A will respond to the beatnote
frequency changes you make.
Signal Source Applications
3-57
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