From eadc522b75f29d9a14d967270010af5b8654cab3 Mon Sep 17 00:00:00 2001 From: blakadder Date: Fri, 22 Feb 2019 22:33:31 +0100 Subject: [PATCH] Created Power monitoring calibration (markdown) --- Power-monitoring-calibration.md | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 Power-monitoring-calibration.md diff --git a/Power-monitoring-calibration.md b/Power-monitoring-calibration.md new file mode 100644 index 00000000..b74b87f2 --- /dev/null +++ b/Power-monitoring-calibration.md @@ -0,0 +1,24 @@ +You might need to calibrate your power metering device as correct measurements are influenced by hardware and timing differences. + +This is how to do it: + +You will need a: +- calibrated multimeter (AC capable) +- incandescent light bulb (we use a 60W one in the example) +- (optional) power meter (aka Kill A Watt) + +1. Connect the light bulb to your device. (Optional: plug your device into the power meter) +2. Open the Web UI for your device in one window and another window to that same devices Console +3. Turn power on and wait a few seconds for the power metering to settle on a stable power reading +4. Verify the **Power** reading in the web UI (optinal: and with the power meter) for the expected 60W and if needed change the power offset with command:
    `PowerSet 60.0`
    *(if you're using something with different power draw enter the appropriate number)* +5. Verify the **Voltage** reading with the multimeter and if needed change the voltage offset in V with command:
    `VoltageSet 235.5`
    *(235.5 would be replaced with your measurement which varies depending on the electrical standards and your electrical grid)* +6. Verify the **Current** reading by calculating current value (amperage) using formula **P(W)/I(V)=I(A)** and if needed change the current offset in *mA* (mA=A\*1000) with command:
    `CurrentSet 254.777`
    *(instead of 254.777 enter your calculation value of ***A multiplied by 1000***)* + +Current calculation: +``` +P/U=I +W(atts)/(V)oltage=(A)mperes + +watts/volts *1000=CurrentSet value +(60.0/235.5)*1000=254.777 +```