Hey I'm Brian, with hvac school and HBC our school comm, the hvac school podcast, making this video today in conjunction with true tech tools, comm, I work with them and deal with a lot of their testo tools, and so today we're going to talk about the 770 3 and specifically how you can use the 772 X 3 to measure wattage or power directly, you don't have to do any math. You can use it directly on the meter and measure the actual power consumed so before we do anything else before I take the panels up, I'm going to show up the disconnect because it's a safety dressed practice to have power off when you're pulling a panel. In case anything is loose in there. You don't want it to come off and shock you.

There pull the disconnect, even though we're actually doing a powered run, a powered test. This test we're going to do actually with the power running when you're taking the panels off. It's best, if possible, to do that with the high-voltage power turned off all right, so it's a 770 3. It will actually go if the power will go off.

If it's on any of these settings and then you just have to shut it off and then turn it back on in order to read so if I was going to read amperage mode, I would just put it on a if I was going to read voltage. I would put it on V and then use my probes. It's pretty standard stuff, but if I want to measure power, I take it all the way up to W and in order to measure power, I have to take an amperage with the amp clamp and I have to read the voltage simultaneously. I'm going to show you how that's done, because I want to measure the power coming in to the entire device, I'm putting it over.

One of the main power leads going line into the unit. So that's. Why I'm that's? Why I'm here and then what I'm going to do, is I'm going to switch out these probes with some alligator clip probes just to make it a little easier to read so connecting black to the common side on the left, making red the right side? Now I have the power off, and that makes us a little bit safer to do. I'm going to take one side make sure that I get in a good, solid connection.

I just want to make sure that it's not going to not going to come off nice and tight all right. So now we are ready to read, and so, if you look at this display right now, our power factor is at one: that's a unity power factor, and that's that that's what you're looking for, whenever you have a motor load running The Closer that it is to 1, the better, so if it was point 9 5 that would be real common point. Nine four point: nine three would be very common, but if you got down in below point nine, that would be a poor power factor which means that your power is out of phase which is created by the actual inductive load. That's due to an inefficiency in the in the motor capacitor balance, but at this point we're going to go ahead and look and see what our, what our total wattage of this system is, I'm going to go ahead and turn on the disconnect all right.

So now you can see I'm on, I haven't, put the amp mode versus to show you the amperage, which is twenty point. Seven running amp we go to voltage. Our voltage is 213 volts, as the commercial building is at our shop until it's 208 power, and now, if we take it up to wattage, it's going to also factor in power factor and give us our total system wattage. It does take a second to read all right, so you can see right now.

The system is running 4.5. Kilowatts, that's four thousand five hundred and seventy two were very close to unity. Power factor on this, which is good, means that the system is working properly and if you do the math, with the amperage that we were getting before. With this.

With this power factor and this wattage you're going to see that the math works out because both times amps equals Watts, that's watts law, so, 21 time 2:12. Let me go ahead and just grab a calculator twenty-one times and twelve equals four thousand five hundred four thousand four hundred. Fifty two, that's four point, four five kilowatts, which is about exactly what we were reading now. One thing you will notice is that it is very sensitive to the positioning of the clamp, so the position of the clamp really needs to be by the wire it's a reading, and you want to try to isolate it a little bit from the wires around it.

If possible, it does take it a second to start to read there we go, the system is running, good power factor are very close to one, and the kilowatts are matching up with our amperage and wattage. So we can use this now if we wanted to actually calculate the eer of our system, we could figure out our BTUs and our wattage and use those to calculate our neer. So nice feature that the test Oh 773 has, and most meters do not have - and it's nice to be able to use this in order to actually prove the amount of power that a system is consuming, not just the wattage in voltage, but also being able to Calculate the power factor, as with all of the high quality test out products, you can find them. By going to true tech tools, comm use the offer code gets cooled for a great discounted check out.

Thank you for watching.