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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 13th Jun 2018, 11:14 pm   #61
Skywave
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Arrow Re: Wiring a desk electric fan.

It may be a bit late to mention this, but I'd like to try to help.
In my experience, measuring low resistance of an inductance with a DMM can give confusing - and incorrect - results. Best to use an analogue meter, such as an AVO 8.

Al.
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Old 14th Jun 2018, 8:46 am   #62
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Default Re: Wiring a desk electric fan.

Yes, get that AVO working - it's just the job for this, and you will master using it in no time with help from the people here.
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Old 14th Jun 2018, 10:13 am   #63
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Default Re: Wiring a desk electric fan.

I do agree about getting that AVO up and running, regardless of whether it gets used for determining the connections of that fan. I use a model 7 (I've had one for about 40 years, although I've got several) all the time for taking various 'low ohms' readings. I don't generally bother with the 9 volt battery side and just have a 1.5 volt cell fitted in the manner I've already described in a previous post.

I hope I haven't put the OP off with my talk of 'serious risk of electric shock', but I think we have to stress this point when directing someone to make connections to the mains, or when dealing with any other high voltage source for that matter. However, I get the impression from the OP's posts that he's not the sort of person do do anything daft in this regard, but still worth mentioning just in case.

If the OP does as suggested with a mains light bulb in series (lamp limiter), he'd have the thing up and running in the time it takes to put the kettle on and mash a cup of tea!
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Old 15th Jun 2018, 10:43 pm   #64
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Default Re: Wiring a desk electric fan.

I have now taken the two batteries out of my Avometer and they are of the 4.5 V Eveready Ultra Plus variety. I don't know whether these are available in ordinary shops, or whether any 4.5 V batteries of the same size/shape will suffice.
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Old 15th Jun 2018, 10:58 pm   #65
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Default Re: Wiring a desk electric fan.

4.5v batteries still available as a niche product possibly (but not in the high street)

Your alternative option might be to convert it to a PP3, which will give you the 9 volts required.
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Old 15th Jun 2018, 11:13 pm   #66
The Philpott
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Default Re: Wiring a desk electric fan.

To clarify, the 1.5v cell in the meter (which these days has to be converted to a D cell as the old cell is obsolete) will make the LOW and MEDIUM resistance range on the meter work. (which gives you 50 or 500 ohms at centre scale)

To get the HIGH resistance range working (5,000 ohms centre scale) you need 9 volts (hence the pair of 4.5v batteries which are wired in series.)

With a combination of help from here and looking at tutorials i would say this is something you are highly likely to be able to pick up.

I agree with what people have said about your AVO. It is well worth dusting off and using. If i was nearer i would put it thro' it's paces for you. Certain elements of an old AVO are not dissimilar to the workings of a clock or old telephone exchange- a fusion of electrical and mechanical functions and principles.

I should say it is comparatively easy to kill an avometer if you are new to electrical testing and analogue meters- best you have the booklet that goes with it (should be a scan easily available)

Dave
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Old 16th Jun 2018, 1:04 am   #67
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Default Re: Wiring a desk electric fan.

Quote:
Originally Posted by The Philpott View Post
It is well worth dusting off and using. If i was nearer i would put it thro' it's paces for you.

Dave


I'll research my Avometer on the internet.
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Old 16th Jun 2018, 7:14 am   #68
The Philpott
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Default Re: Wiring a desk electric fan.

I have the working instructions on a pdf i can email you. It's also on richardsradios website.

Dave
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Old 16th Jun 2018, 7:17 pm   #69
julie_m
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Default Re: Wiring a desk electric fan.

Does anyone else ever sometimes wish you could just reach through the screen of your laptop, grab the offending device and have it right there in front of you, whereupon it would be obvious what needed doing with it?
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Old 16th Jun 2018, 7:41 pm   #70
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Old 16th Jun 2018, 11:01 pm   #71
The Philpott
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Default Re: Wiring a desk electric fan.

Possibly, but it would also be nice if we could keep the pH above 6.
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Old 16th Jun 2018, 11:33 pm   #72
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Default Re: Wiring a desk electric fan.

I came across the following whilst perusing various diagrams which isn't particularly encouraging. I think those of the opinion that this particular wiring job requires a personal hands on approach may be correct.

I have motor with five outgoing wires: white, brown, red, blue and black.
• white - has no resistance with any of the others.
• brown-blue = 136ΩΩ
• brown-black = 366
• brown-red = 108
• red-blue = 25
• red-black = 260
• blue-black = 236

Your description is confusing and the motor is complicated. There is no standard for colour coding motor wires. The motor may be defective. There is little chance of figuring out the correct connections based on resistance readings. Someone with a lot of experience and more test equipment might be able to figure it out, but it is probably a waste of time to attempt to figure it out using an internet forum like this. – Charles CowieFeb 15 '17 at 15:07

• Stainless answer is very correct. There is no assumptions as the details are technically and theoretically correct. With the second upload of drawing with the starting and main winding, the details are very correct and there is nothing that will prevent the motor from running. The rest job is for OSM to wire correctly – Kamah Dec 27 '17 at 7:30

• If you do not know which wires are connected to the start capacitor, you are lost unless the MFG has a diagram for you. – Sparky256 Dec 29 '17 at 5:53

• If you know where the motor came from there may be a chance to find how it is intended to be used. Tracing existing wiring or circuitry would be a great help. – KalleMPDec 30 '17 at 12:36
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Old Yesterday, 2:55 pm   #73
The Philpott
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Default Re: Wiring a desk electric fan.

Peter, i haven't enough experience with motors to assess the fan, but if you decide you will be using your Avo 7 we could assess any bugs with it next time you're passing.

Couple of things- you will have seen from the manual that Voltage and Current measurements can be taken without the batteries installed; the meter takes it's power from the circuit under test. (Measuring Resistance requires the internal power.)

I notice the yellow digital meter you used is basically the same as one of mine- and it may or may not be significant to note that the first two ranges to start randomly failing on mine were the 200 and 2000 ohm ranges.

Dave
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