User manual

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The wobbulator can also be set via the VCF control input.
To use the function generator as voltage-controlled sweep generator, proceed as follows:
• Use the function generator as described in chapter 8.7. The adjustment button “WIDTH” remains pushed, however
(do not pull). No setting is required at the adjustment button “RATE” or “WIDTH” either.
• Apply a direct-voltage free, asymmetrical change signal to the VCF-input (5). An amplitude of 0 to 10 V permits a
wobble ratio up to 100:1. The curve shape is unimportant. Observe that the dropping ank of the signal is larger
than the rising ank (changed symmetry).
 We recommend connecting an oscilloscope (if present) to monitor or review the settings.
 
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 
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
The frequency generator can be used as frequency counter.
For this, switch the display to external counter operation via the switch “COUNTER INT/EXT” (17).
Switch pushed: External counter operation
Switch not pushed: Internal generator display
Select the frequency range “FREQUENCY RANGE 1” (13).
The counter input (4) is designated “EXT COUNT IN” and can be used for frequencies up to 100 MHz.
A “low-pass lter” is installed to be able to measure even lower frequencies (<100 kHz) without interferences. This
suppresses high frequency shares (-3dB) that may falsify the measurement.
Push the switch “LPF” (17) during frequency measurement below 100 kHz. This switch must not be pushed at high
frequencies.
 
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After application of a frequency of at least 2 Hz to max. 100 MHz with a signal voltage galvanically separated from
the mains and a max. amplitude of 48 Vpp (= tip-tip), it is displayed on the 7-digit display. Other buttons for operation
of the frequency counter are not required. The decimal point, the measuring units and the gate time are automati-
cally set to the expected measuring signal. The input sensitivity is at least 100 mVrms.
The last measured frequency is retained in the display until a new measurable signal is recognised. When discon-
necting the measuring line, the last measured value is retained until the function is changed or a new signal applied.
 
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