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L7663 Power Useage meter

Discussion in 'Hobby Electronics' started by RMD, Jul 3, 2008.

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  1. RMD

    RMD Guest

    Hi All,

    I've just had one of these $69.95 L7663 meters delivered from Planet
    Earth Solar.

    I've just been trying it with combinations of 60W desk lamps and 7W
    (nominal) nightlights.

    The 60W desklamp measures at 58W, the same as measured by the Jaycar
    meter. Adding a single nightlight boosts the meter reading to 62W.

    The nightlight by itself or the meter with no load at all often reads
    0W or 2W and this is also with or without the nightlight illuminated.
    So, this meter is a bit dodgy with lower powers too, as was the Jaycar
    meter.

    Measurements:

    1X60W bulb = 58W

    1X60W bulb + 1Xnightlight = 62W

    1X60W bulb + 2Xnightlight = 66W

    2X nightlights = 8W

    1X nightlight = 0W or 2W

    No-load = 0W or 2W.

    Ross
     
  2. Phil Allison

    Phil Allison Guest

    "RMD"

    ** If all you wanted to do was measure resistive loads like lamps - then
    use you damn DMM on AC current !!





    ....... Phil
     
  3. RMD

    RMD Guest

    Phil,

    I'm testing it with bulbs.

    If it works with bulbs then I'm prepared to believe it might work with
    inductive small loads like plugpacks or other similar loads such as
    standby power on electronic equipment

    Ross
     
  4. Phil Allison

    Phil Allison Guest

    "RMD"

    ** Then you are EXACTLY the colossal, fucking IDIOT I suspected !!!

    Have you not read a SINGLE word posted here on the matter ??

    Still got NO idea what VA means as compared to watts ??

    Still got NO idea how a true power meter must operate ???

    Obviously not.


    For ****'s sake, get yourself a 1uF mains cap and test it with that - the
    reading should not vary from no load.

    If you want see what the standby power of ALL your appliances is - then put
    the WHOLE LOT on the same circuit and measure the total !!

    You crappy meter might just be able to do that.



    ....... Phil
     
  5. Is the resolution of this meter only 1W?
    If it is that's disappointing.

    Dave.
     
  6. RMD

    RMD Guest

    Hi All,

    The power meter seems to have stabilised after being left plugged in
    overnight.

    It now consistently reads 2W without anything being plugged into it.
    Previously it was switching between 0W and 2W. It also claims that
    0.05A is flowing with nothing plugged in to the power meter.

    So there is a zero error. Pulling it apart there seem to be no
    adjustments like the Jaycar meter has.

    It is now reading 6W consistently when I plug in a 6W (nominal)
    nightlight by itself. The nightlight also adds 4W to the reading if a
    60 watt lamp is already plugged in.

    I tried it with a VCR switching it from standby to play, and it went
    from 4W standby power to about 10W play power. (Subtracting the 2W
    zeroing error.)

    Trying it with a 60W bulb plugged in as well as the VCR gave much the
    same result for the VCR standby/play power.

    Ross
     
  7. RMD

    RMD Guest

    On Thu, 3 Jul 2008 18:35:09 -0700 (PDT), "David L. Jones"

    Yes, the meter reads only to the nearest watt.

    Ross
     
  8. Bugger.

    So is the SC power meter kit the only decent low cost high resolution
    power meter available in Oz I wonder?

    Dave.
     
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