The instructions in the package are pretty inscrutable, so here's a quick HOWTO.
Basic Idea
- This thing sits between your battery and your ESC.
- It measures voltage, amperage, and wattage.
- It has a HOLD mode that keeps the highest values.
- When it's set up, you fiddle with your props, motors, etc, and see the power requirements of various setups.
- You can send it aloft to record the flight's peak power requirements.
- The unit doesn't come with any power connectors, so you need to attach your own.
- The wires labeled IN attach to the battery. Put a male power connector here.
- The wires labeled OUT attach to the ESC. Put a female power connector here.
- Black wire = Neutral (-)
- Blue wire = Hot (+)
- Plug the unit into a battery. Whatever battery you use to fly a plane is fine (the manual says the voltage rage is 8-30V, but it seems to work fine with 2S batteries as well, as seen below).
- The display of the unit will turn on.
- If you use a 2S battery, you will see something like this:
- Voltage (U=7.93V). Over time this will go down, as your battery discharges.
- Amperage (I=0.1A)
- Wattage (P=1.0W)
- Attach a motor to your ESC.
- Plug your ESC into a receiver. It's OK if there are servos attached.
- Attach the OUT wires to your ESC.
- Your setup should power up and work as normal.
- The power levels should go up a bit, since you're running servos and a receiver.
- Wiggle your servos. You will see the numbers jiggle in response.
- Make sure your motor is secure, and bring the speed up.
- You will see the amperage (I=) and wattage (P=) increase.
- Bring the speed back down.
- You will see the values decrease back to the original values.
- The voltage may have gone down a bit, since you've been using some power to run these tests.
- HOLD mode will measure the Peak values.
- To turn it on, click the HOLD button.
- Rev your motor and bring it back down a couple of times.
- You will see these peak values displayed. Rearranging the order a bit, they are:
- P 14.3W -- maximum power (wattage). This is the peak power output of the battery.
- Up 7.71V -- voltage when P was at max.
- Ip 1.9A -- amperage when P was at max.
- Im 1.9A -- maximum amperage, even if it didn't correspond to P above.
- Um 7.84V -- the minimum voltage of the time period.
- Click HOLD again to go back to instantaneous mode.
- If your plane is big enough to carry a couple of extra ounces, you can attach the meter between the battery and ESC in your plane, set HOLD mode, and find out your peak usage aloft.
- If you have a good quality multimeter, you can adjust your unit's readings.
- Depress HOLD for three seconds and you will be in adjustment mode.
- Measure an unloaded power source with both the watt meter and your reference multimeter.
- Use the ADD and SUB menu items to make the two units agree.
- SAVE will of course save your calibration.
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