FAQ
Autoranger
Question: Autoranger BOM and parts questions
Answer:
Over the course of people building autorangers, they may find alternatives for some of the parts. If I learn about that I will update the BOM and show the alternative.
Notes:
1. The attenuator board layout shows an SMD 'C13' at the middle front. This capacitor is not needed. .
2. There are several spots for compensation capacitors that only apply to specific opamps used. For instance, C17 is meant for use with an NE5534 in the U3 position; C2 would be used with an AD797 here. See also the Assembly Guide.
Question: What are the distortion and noise specs for this unit?
Answer:
All specifications are available in the Spec Sheet which can be found at the Autoranger page.
Question: Does the Autoranger need calibration, and what equipment would I need for that?
Answer:
The first version of the autoranger needed calibration for frequency response flatness, but the current MK II does not require that anymore. It does need an adjustment for maximum Common Mode supression, which is described in the Assembly Guide.
You'd need an AC mV meter to adjust a trimmer for minimum indication.
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