[time-nuts] Wavecrest DTS 2070

Mark C. Stephens marks at non-stop.com.au
Mon Sep 9 15:30:44 UTC 2013


Hi Henk, mine has option a110.

The linear supply is definitely strapped for 110v.

I disconnected the primary and connected a 24v system supply in its place.
Everything burst into life (at 110v, through step-down transformer)
Haven't been game to try 230v yet...

I guess I'll look at fix or replace 24v standby linear PSU.

The second linear has me scratching my head, 2V at 6A and is activated by solid state relay.
Goes off to the card frame somewhere, haven't tried tracing yet.

Definitely not looking forward to removing that monster bottom board.

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Henk ten Pierick
Sent: Monday, 9 September 2013 9:05 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Wavecrest DTS 2070

Hi,

The 207x is. Auto sensing for the mains.

Groet,

Henk

Op 9 sep. 2013 om 11:52 heeft "Mark C. Stephens" <marks at non-stop.com.au> het volgende geschreven:

> After removing endless hex screws to get at the insides I find the 24V/2A PSU that supplies the standby voltages has what appears to be a transformer primary short.
> Problem is, one has to remove the input board to get at the PSU screws.
> Sounds easy when put like that...
> I'll take some pix to show why I am so terrified of this input board.
> 
> Looking at Eds teardown on 
> http://www.eevblog.com/forum/testgear/wavecrest-dts-2077-teardown/?act
> ion=dlattach;attach=58083 Ed has a single standby switch mode - the 
> small silver slotted box with the yellow wires.
> Mine is ancient and has 2 linear PSU, but hey, it's got the yellow wires!
> 
> Anyway I have, used my post quota for the day - nite..
> Oh before I go, luckily I checked, yes all the PSU (in this model) need strapping for utilised input voltage.
> I found a couple of "expanded/exploded" surface mount electro (tantalum?) caps on the filter board between the switch mode frame and the card cage.
> I have not a clue what that means..
> 
> 
> --marki
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 
> On Behalf Of Mark C. Stephens
> Sent: Monday, 9 September 2013 6:31 PM
> To: Bob Stewart; Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Wavecrest DTS 2070
> 
> I pried open the fuse compartment.
> Both fuses black. Black as in dead short black.
> Not good. Short circuit on mains input.
> Open case. big thick wire carry mains to solid state relay then off to switch mode modules.
> Relay cannot be short between supplies. Must be one or more PSU with chopper or bridge short.
> Marki will have to be careful. Expensive and dangerous equipment at stake.
> 
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 
> On Behalf Of Bob Stewart
> Sent: Monday, 9 September 2013 2:22 PM
> To: Bob Stewart; Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Wavecrest DTS 2070
> 
> Oops.  Maybe I should have just kept my peace.  I found a User's Guide 
> here: "http://qmsi.com/pics/Wavecrest2070.a.pdf" which indicates it 
> can take either 110 or 220.  Pry open the fuse compartment and see 
> what's in there.  Someone else will now probably post the right way to 
> go about it, though.  =)
> 
> 
> Bob - AE6RV
> 
> 
> 
> 
>> ________________________________
>> From: Bob Stewart <bob at evoria.net>
>> To: Discussion of precise time and frequency measurement 
>> <time-nuts at febo.com>
>> Sent: Sunday, September 8, 2013 11:13 PM
>> Subject: Re: [time-nuts] Wavecrest DTS 2070
>> 
>> 
>> Go to a tourist supply store and buy a 110 to 230/250 transformer.  I did that the year I spent in France for a TV or something we took over there.  Be sure you get one that's big enough.  Be sure you don't wire it backwards and get 250 to 500!!!
>> 
>> Bob - AE6RV
>> 
>> 
>> 
>> 
>> 
>>> ________________________________
>>> From: Mark C. Stephens <marks at non-stop.com.au>
>>> To: "time-nuts at febo.com" <time-nuts at febo.com>
>>> Sent: Sunday, September 8, 2013 11:05 PM
>>> Subject: [time-nuts] Wavecrest DTS 2070
>>> 
>>> 
>>> I just received my DTS 2070 from 110 volt land.
>>> I live in 230 (well actually 250) volt land.
>>> 
>>> I haven't plugged it in and I am being a total wuss about breaking the CAL seals as they are still current.
>>> 
>>> Please help me, I really, really need to measure something with it! Anything with it! But to do that I need to apply power!
>>> 
>>> Is the DTS 2070 PSU auto sensing or do I need to change something?
>>> 
>>> 
>>> --marki
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to 
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