Topic: ADI 8-DS converters partly out of specs


first of all: Happy new year.

I've got a used ADI 8-DS MKII here, bought it via eBay. It was built in November 2010. I was fiddling around with it for a bit and it turned out that the converter for channel pair 3 and 4 runs out of specs.

I was measuring SNR (unweighted) at loGain position, these are the results:

Channel 1 + 2 : 115 dBfs
Channel 3 + 4 : 103 dBfs
Channel 5 + 6:  114 dBfs
Channel 7 + 8:  113 dBfs

I consider the readout of channels 1,2,5,6,7 and 8 as normal. Channels 3 + 4 with their 12 dB difference compared to channels 1 +2  are apparently not behaving as they are supposed to.

My first thought was that there might be a problem with the power supply, since the SNR drops about a dB from converter to converter - but since channel pair 3 + 4 are about 12 dB up in noise I'm not so sure about this. The power supply looks fine, no bulging caps. I was contemplating replacing it anyways, because I read here and elsewhere that aged power supplies could lead to overvoltage in this unit.

Any thoughts what the cause for this all could be ?


Re: ADI 8-DS converters partly out of specs

I would contact support by e-mail. Support e-mails in your country, see webserver.

BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13

Re: ADI 8-DS converters partly out of specs

Hey ramses,

thx for your reply.

I'm getting a new power supply within the next few days. If the problem persists I'm gonna contact support, as you suggested.