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Old 23rd Apr 2024, 7:21 am   #1
AndyGilham
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Default Acweeco ct155

Good morning all.

I have just taken delivery of a CT155, the Calibration unit used in conjunction with the Military Electronic Multimiter CT38.

This was kindly donated to the Megger collection and goes nicely with the two CT38 that were donated.


Andy G
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Old 23rd Apr 2024, 9:49 am   #2
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Default Re: Acweeco ct155

I'm surprised it wasn't built big-ammo-box style like the CT38 case, but the mains selector and other things on the panel are awfully familiar.

I bought a CT38 in the mid sixties and it was my only multimeter for many years.

David
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Old 23rd Apr 2024, 11:55 am   #3
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Default Re: Acweeco ct155

That's the version that the RAF used. The army also had them but insisted on calling them Calibrators, Voltage, 7-range No. 1 Z4/ZD02069
It will be interesting to know if the Weston standard cell in it is still viable after 70 years.

I still have - and use - a CT38 on my (fortunately quite large) bench and it still does its job when given time to warm up and stabilize. All part of the "keep them glowing" hobby.
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Old 23rd Apr 2024, 12:17 pm   #4
The Philpott
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Default Re: Acweeco ct155

Is the perspex a safety retrofit or is it original?

Dave
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Old 23rd Apr 2024, 12:40 pm   #5
AndyGilham
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Default Re: Acweeco ct155

The perspex cover is original as far as I know.

Andy
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Old 23rd Apr 2024, 1:39 pm   #6
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Default Re: Acweeco ct155

My CT38 had a perspex cover over the mains voltage selector. It had come from G3FIK's shop in Alum Rock, Birmingham, and presumably from government auction before him. So the cover was unlikely to have been added by anyone between the forces and me having it.

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Old 25th Apr 2024, 11:17 am   #7
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Default Re: Acweeco ct155

The picture announcing the launch of the CT38 (Wireless World May 1952, page 186) shows the plastic cover over the voltage selection panel, so it's an original fitment.

During its service career there was only one modification ever published for the CT38 (adding two decoupling capacitors) so AVO got it pretty much right first time.
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Old 25th Apr 2024, 12:59 pm   #8
Craig Sawyers
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Default Re: Acweeco ct155

This undated price list has the CT38 as the most expensive AVO product at that time. £150 when the AVO 8 was £19 10s

I make that around £8k-£10k in today's money, scaling for the price of an AVOmeter when it dropped of the perch at around £700, plus a chunk for inflation since.

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Old 25th Apr 2024, 1:05 pm   #9
Craig Sawyers
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Default Re: Acweeco ct155

Quote:
Originally Posted by AndyGilham View Post
Good morning all.

I have just taken delivery of a CT155, the Calibration unit used in conjunction with the Military Electronic Multimiter CT38.

This was kindly donated to the Megger collection and goes nicely with the two CT38 that were donated.


Andy G
Very nice indeed!

What is the state of the standard cell?

Craig
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