Elenco Snap Circuits SnapMicro ® I Standard - Manual (Page 71)

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To test the Green Power Meter (GPM) change the second pause in the program from 59940 to 1 and
download into the Snap Circuit® on the
previous page. After removing successful
download window, quickly open the
terminal by pressing <F8> key. Restart
the GPM and your terminal window
should display the ‘Wattage = 100’
message.
The red LED should be flashing very fast
if enough light is present to trigger the
record part of the program. Place your
hand over the photo resistor and the
flashing should stop. Press the S2
pushbutton to see recorded data. It will
take between 5 to 10 seconds to emulate
one day of recording.
14 Days recorded, cost = $1.84.
24 Days Recorded
– memory full
In this example the lamp would have cost
the user $3.23 for 24 days of use.
Be sure to change the wattage setting to the value of the lamp you will test and the price per kilowatt
hour to the nearest penny rate on your electric bill. Replace original pause settings and download the
program. Remove computer leads and install 10K resistor. Place it under the light to be tested. Make
sure the LED flashes once every minute the lamp is on, and does not flash when lamp is off. Wait 24
days to get a good reading on the cost of normal use of the lamp. Although the GPM can only measure
up to 255 watts directly, any device tied to a light source can be calculated. For example, a 1200 watt
heater with a light would cost 12 times the number calculated above or 12 x $3.23 = $38.77 for 24 days.