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on Feb 17, 2010
on Feb 17, 2010 by lhornburg
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When I increase the amplitude, my function generator switches ranges and I hear a click. How do I disable this?
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Feb 17, 2010 3:32 PM
By default, the 33250A and 33220A Function/Arbitrary Waveform Generators have Autoranging enabled. This allows the generator to automatically select the optimal settings for the output amplifier and attenuators. The advantage of disabling autoranging is to eliminate momentary disruptions caused by switching of the attenuators while changing amplitude. However, the amplitude and offset accuracy and resolution (as well as waveform fidelity) may be adversely affected when reducing the amplitude well below the expected range change.
The Autorange may be disabled either from the front panel (Utility -> Output Setup -> Range -> Auto/Hold) or by the command VOLTage:RANGe:AUTO OFF|ON|ONCE
Once the range is set to Hold (as compared to Auto), the current amplifier/attenuator settings will be held constant. As a best practice, it is a good idea to adjust the amplitude to the maximum desired voltage before setting the range.
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