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346 noise sources are not really usable below 10 MHz. The match becomes very bad due to a d.c. block between the noise diode and output attenuator. So, even if you characterized the noise that does make it through the capacitor, you would be dealing with a bad return loss.

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Vladan

Has anyone investigated the ENR and ENR uncertainty of the HP 346A noise source at frequencies below 10 MHz? Same question for the HP 346B?

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If so, what was found?

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Thanks!

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Whitham D. Reeve
Anchorage, Alaska USA
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