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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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6th Jun 2011, 4:04 pm | #1 |
Nonode
Join Date: Jan 2010
Location: Edinburgh, UK.
Posts: 2,008
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Dymar 2065 distortion meter.
I have just about completed the restoration of one of these.
When it arrived the phase balance pot was missing. It did not take me long to wor out the a 5k pot worked. Now that the meter is in full working order I have come to the conclusion that this pot was a dual concentric for course and fine adjustments. Does anyone have a schematic to confirm this and what the values were. Even better still if anyone has a scrap meter so I could buy the part. Thanks Al
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7th Jun 2011, 5:23 pm | #2 |
Hexode
Join Date: Apr 2007
Location: Wiesbaden, Germany
Posts: 333
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Re: Dymar 2065 distortion meter.
Here the schematic for the Dymar PSU
I'm searching for any future info about Dymar equipment. Peter |
7th Jun 2011, 9:50 pm | #3 |
Nonode
Join Date: Jan 2010
Location: Edinburgh, UK.
Posts: 2,008
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Re: Dymar 2065 distortion meter.
Hi Peter
That power supply schematic is much more complex than the one on my 2065. I think your equipment must be different to mine. Al
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8th Jun 2011, 5:44 am | #4 |
Hexode
Join Date: Apr 2007
Location: Wiesbaden, Germany
Posts: 333
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Re: Dymar 2065 distortion meter.
Here for a compare, the 1765 Distortion Factor Meter.
Left side PSU and Meter Modul right side Distortion Meter Modul Peter |
9th Jun 2011, 1:36 pm | #5 |
Nonode
Join Date: Jan 2010
Location: Edinburgh, UK.
Posts: 2,008
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Re: Dymar 2065 distortion meter.
Peter
As requested, here are some more pictures of my 2065. The next time you take the covers off yours can you tell me the values of the coarse and fine phase balance potentiometers. I know that mine works with 5k ohms as the coarse control. Even if yours has a different value I can still work out what percentage of the range the fine control gives. Thanks Al
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11th Jun 2011, 12:43 am | #6 |
Retired Dormant Member
Join Date: Oct 2006
Location: Brighton
Posts: 1
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Re: Dymar 2065 distortion meter.
Hi Peter,
Your meter is a ex Redifon/Redifusion Radio Systems unit. I recognise the cal labels. The 106/11 label is an asset number used in Redifon, 106 denotes a distortion meter, the 11 indiacates your unit is the 11th distortion meter in the system. The cal label tells me the unit was calibrated by Ian Walker in 1993 at Redifion SPT in Crawley. At some point post 1994 your meter would have been disposed by Redifon. I believe Dymar were taken over by Farnell Instruments. Roland |
11th Jun 2011, 1:59 pm | #7 |
Hexode
Join Date: Apr 2007
Location: Wiesbaden, Germany
Posts: 333
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Re: Dymar 2065 distortion meter.
Roland,
Dymar was founded in 1964, Burndept took over Dymar in the early 80s. They were based in Watford. Burndept became FKI Burndept and they had a place in Bolton because they had the contract for Bolton Police. Burndept moved out of Erith some years ago to Thamesmead and became part of Signature Industries, the only RF type stuff they do now is SARBE type equipment where they are one of the major players. My meter is part of a design family with 2 modules, PSU + Meter and Measuring part, like Dymar 0711 - VHF Millvoltmeter Dymar 0741 - Audio Signal Generator Dymar 1765 - Distortion Factor Meter Dymar 1771 - AF Wave Analyser Dymar 1785 - Modulation Meter AM-FM Interesting is the way, the meter was going till dumped on my bench ;-) Peter |
21st Nov 2020, 12:09 pm | #8 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
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Re: Dymar 2065 distortion meter.
Thread re-opened at OP's request
Cheers Mike T
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21st Nov 2020, 12:36 pm | #9 |
Nonode
Join Date: Jan 2010
Location: Edinburgh, UK.
Posts: 2,008
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Re: Dymar 2065 distortion meter.
A long time after this thread was closed I did acquire a copy of the combined user and service manual. For anyone that needs a copy it is attached here.
Al
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21st Nov 2020, 2:01 pm | #10 |
Hexode
Join Date: Apr 2007
Location: Wiesbaden, Germany
Posts: 333
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Re: Dymar 2065 distortion meter.
Thanks Al.
Peter |