Bradley electronics - Voltage Calibrator Type "134” - UK Vintage Radio Repair and Restoration Discussion Forum

__Erik__ · 16th May 2021, 10:39 am

Dear fellows, passionated about vintage electronics.

Please forgive me if I make any mistake and feel free to correct me as this is my first post on the UK Vintage Radio Repair and Restoration Discussion Forum.
I made yesterday a similar post on the EEVblog Electronics Community Forum as I was not aware of the existence of this forum. My fault, didn't search good enough... maybe.

I have a request regarding an instrument that I have been collecting from what I like to call “a mine” of vintage instruments (several hundreds of them) here in Norway last year.

Anyways, the brand is “Bradley electronics” and the model is “Voltage Calibrator Type 134”.

I have been looking for a while on the internet and could not find any traces of any documentation.

The calibrator is working fine considering its age; it’s quite accurate and stable measured against a calibrated meter. I have not opened the beast yet.

Does anyone sit on information such as manual / technical specifications?

Any contribution will be much appreciated.

Thank you!

Erik.

chriswood1900 · 16th May 2021, 12:37 pm

There was previous thread on this unit which might help, here https://www.vintage-radio.net/forum/...d.php?t=131406

Vintage_RC · 16th May 2021, 12:37 pm

There has been an earlier discussion about this piece of test equipment on this forum:-
https://www.vintage-radio.net/forum/...d.php?t=131406
At the time a member mentioned he had the manual and was prepared to scan it.

Edit: my post crossed with Chris Wood

WME_bill · 16th May 2021, 2:39 pm

Bradley 134.
And as the mysterious "member" referred to in the quoted thread, I am still here. And the manual for the Bradley 134 is not yet scanned, as no-one had asked for it.
I also have manuals for other Bradley calibrators and other test equipment they made. (CT471 multimeter, pulse generator, oscilloscope, sampling adaptor, oscilloscope calibrators).
I find I have two copies of the 134 manual, so to save me having to scan it, I would be glad to post you one of the originals as an alternative.
As Erik has sent me a PM also, I will discuss how we can achieve that separately.
wme_bill

__Erik__ · 16th May 2021, 9:09 pm

@wme_bill I will PM as soon I can.
Thank you very much!

__Erik__ · 19th May 2021, 10:24 am

While waiting for the manual, I made some measurements to have an idea about the deviations of this Bradley 134.

What do you think?

Attached txt file with data.

Please let me know if you see something wrong...

Thank you!

16th May 2021, 10:39 am	#1
__Erik__ Diode Join Date: May 2021 Location: Viken, Norway. Posts: 3	Bradley electronics - Voltage Calibrator Type "134” Dear fellows, passionated about vintage electronics. Please forgive me if I make any mistake and feel free to correct me as this is my first post on the UK Vintage Radio Repair and Restoration Discussion Forum. I made yesterday a similar post on the EEVblog Electronics Community Forum as I was not aware of the existence of this forum. My fault, didn't search good enough... maybe. I have a request regarding an instrument that I have been collecting from what I like to call “a mine” of vintage instruments (several hundreds of them) here in Norway last year. Anyways, the brand is “Bradley electronics” and the model is “Voltage Calibrator Type 134”. I have been looking for a while on the internet and could not find any traces of any documentation. The calibrator is working fine considering its age; it’s quite accurate and stable measured against a calibrated meter. I have not opened the beast yet. Does anyone sit on information such as manual / technical specifications? Any contribution will be much appreciated. Thank you! Erik. Attached Thumbnails

16th May 2021, 12:37 pm	#2
chriswood1900 Octode Join Date: Jan 2007 Location: Dorridge, West Midlands, UK. Posts: 1,481	Re: Bradley electronics - Voltage Calibrator Type "134” There was previous thread on this unit which might help, here https://www.vintage-radio.net/forum/...d.php?t=131406 __________________ Chris Wood BVWS Member

16th May 2021, 12:37 pm	#3
Vintage_RC Heptode Join Date: Sep 2018 Location: Twickenham, London, UK. Posts: 538	Re: Bradley electronics - Voltage Calibrator Type "134” There has been an earlier discussion about this piece of test equipment on this forum:- https://www.vintage-radio.net/forum/...d.php?t=131406 At the time a member mentioned he had the manual and was prepared to scan it. Edit: my post crossed with Chris Wood __________________ Alan G6PUB, BVWS

16th May 2021, 2:39 pm	#4
WME_bill Octode Join Date: Oct 2007 Location: Exeter, Devon, UK. Posts: 1,554	Re: Bradley electronics - Voltage Calibrator Type "134” Bradley 134. And as the mysterious "member" referred to in the quoted thread, I am still here. And the manual for the Bradley 134 is not yet scanned, as no-one had asked for it. I also have manuals for other Bradley calibrators and other test equipment they made. (CT471 multimeter, pulse generator, oscilloscope, sampling adaptor, oscilloscope calibrators). I find I have two copies of the 134 manual, so to save me having to scan it, I would be glad to post you one of the originals as an alternative. As Erik has sent me a PM also, I will discuss how we can achieve that separately. wme_bill

16th May 2021, 9:09 pm	#5
__Erik__ Diode Join Date: May 2021 Location: Viken, Norway. Posts: 3	Re: Bradley electronics - Voltage Calibrator Type "134” @wme_bill I will PM as soon I can. Thank you very much!