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not so old china hand

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not so old china hand last won the day on October 27 2016

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About not so old china hand

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    terence mcmanus

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  1. Caring for a very Poorly Dog

    I can only add my condolences to those expressed already. I can remember the sadness I felt as a boy when our dog passed away, Even sadder when you strove so hard to save him.
  2. What Watts are What?

    Indeed. AFAICR induction motors are prone to this. However the question is whether a so called Universal Meter would be capable of measuring the maximum current and power factor accurately at 220V 60Hz. And as Jake says it might not matter anyway if one is just looking for relative values.
  3. What Watts are What?

    IMO the meter would do no harm to the air con since a meter only senses the current; it does not change it. As to the accuracy of a device rated 230v 50Hz on a 220 60 Hz supply my feeling is it would give the same accuracy at both frequencies: but I can't backup that feeling with hard figures.
  4. What Watts are What?

    Thanks. I was looking at a few "universals" like that, but when I look close they usually say 50 Hz when operating at 220+ Volts and 60 Hz when operating at 110 -120 volts. That seems to be the standard. But I will look more closely at that one. But for now I will give it a rest and look in the local hardware stores tomorrow. Oh that's right, may be closed tomorrow because of some kind of strike. Well we shall see. It's been a long, long, time since I studied physics at college but AFAICR frequency does not make any difference to the measurement of voltage or current and hence power. OK we were using moving coil instruments and maybe (just maybe) digital instruments need to make a correction for frequency. If that were the case (and I think it's not) the meter would need to sense the frequency and correct for changes in the frequency of the supply. This is a long winded way of saying that the more I think about it the more I'm inclined to think that the frequency in the spec does not matter. JMHO An afterthought, why do they quote frequency ranges? I think ecause it is useful to be able to measure the actual frequency since some devices are sensitive to frequency.
  5. What Watts are What?

    There is a universal version made: https://www.alibaba.com/product-detail/ts836a-universal-plug-in-power-monitor_60454004888.html One would hope (foolish I know) that this is the model that would be shipped. Or buy the minimum order of 50 from the manufacturer and give one to each of one's friends
  6. What Watts are What?

    It's a little bit ambiguous because it also says "Voltage Display Range 0V - 9999V"
  7. What Watts are What?

    Agreed and I think for Dave's purpose the power meter he linked to is the way to go.
  8. What Watts are What?

    OK that would do the job. Personally I would prefer not to use probes on bare conductors at 220v. But as Jake would say "Its more pun in the Philippines".
  9. What Watts are What?

    I broke off to read JP's answer. I would guess the technicians were using a clamp ammeter like this one: https://www.amazon.com/Auto-ranging-Digital-Clamp-Meter/dp/B001VGND88 I had a quick glance at the specs but didn't see whether it could be programmed to record a brief surge. AFAICS the power meter you linked to would do everything you require and at $19 (plus shipping) looks like a good deal.
  10. What Watts are What?

    I just did a search on power meters and pulled up the manual for a similar device (Bauhn power meter PA39085). The relevant section says "Max watts – maximum wattage reached during the current monitoring period." In other words the surge current. I noticed that both this meter and the one you linked to on Amazon also show the power factor for the device.
  11. What Watts are What?

    A quick reminder: KWh is the number of units of electricity consumed. It gives no indication of the load from individual appliances (ie the power they require). The power from a generator is generally specified in kVA (kilo volt amps), although marketing material may refer to kW. For some devices (eg incandescent light bulbs) the values are the same in both units. However for devices such as motors there is a difference expressed as kW=kVA x power factor. So for a relatively poor power factor of say 0 .5 a rating of 2kVA would be the equivalent of 1kW in actual power. An an earlier poster suggested the problem might be the starting current. A combination of starting current and a poor power factor could be the cause of the problem. On most appliances there is a plate or label somewhere that will indicate the power factor and maximum current draw. In my experience both petrol generators and inverters are quite good at handling surge starting currents (unlike diesel gennies).
  12. Big Head

    It's a pleasure.
  13. Big Head

    How about a folding Panama hat? One of those that can be rolled-up and fitted into a cigar tube.
  14. First Time with PhilAir

    And they frequently auction upgrades, giving successful bidders the opportunity to fly business class for little more than an economy fare. I stick by my earlier statement that my experience with them has been good: including their handling of missed connections.
  15. Durian: Fruit or Chemical Weapon

    Four score and ten years ago my grandfather worked in Burma. My grandmother would take a durian with her whenever she travelled by train. It guaranteed she would get a compartment to herself.