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12
2.2.5.
Frequency control
fo =m
(1+ 2) ie
wan
a.< (n+ 206 Je 19
where:
fy
= signal frequency at the generator output
m
= frequency-range selected (x0.1, x1, to x100 k}
ng
= frequency-dial value selected (0.1, to 10)
U,.
= contro! voltage at SWEEP
IN input
In order to obtain a jitter-free signal for the lower sweep frequencies, (frequency- and phase-jitter results from
interference on the controt signal), it is recommended that the generator be set to the lowest frequency
desired, and that the entire sweep range be covered by a control signal of positive polarity.
Example:
Dial set to 6
Voltage on "sweep in" —2,5 V
Resulting frequency 1x selected range.
Example:
Dial set to 2
Voltage on 'sweep in' +5 V
Resulting frequency .,.x selected range.
Example:
Dial set to 4
Voltage on 'sweep in" ~ 2 Vpp
Scale setting
Sweep-in voltage
Resulting
Resulting frequency sweep; continuous
frequency
between 2 and 6x selected range
MAS035
Fig. &. Sweep range PM 5127
2.2.6.
TTL impulse-signal output
A TTL-compatible impulse-signal is available at socket I!
Lourt. The frequency and duty cycle of this signal
can be set as described in sections 2.2.2, and 2.2.3, This signal is not influenced by any of the other controls.
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