Smallest Oscilloscope In The World!? Pokit Meter review | Mechanic Mindset
So the guys at pocket meter sent me this to have a play with on one of our cars and im really interested to see what it can do. So if youre interested to check these out, then there is a link below. If you use the link to buy the pocket meter, then we do get a small percentage of that. So really appreciate it. As you might guess, im really interested to see what the oscilloscope can do. I havent really checked it out fully ive downloaded the app and had a little play so lets see how intuitive this thing is so inside the box. What you get is a small pouch to keep the pocket meter inside you get a couple of these small wire clamps which push onto the probes, and you get the pocket meter itself. I mean check out how small that is in the marketing material theyre, showing it being used as a key ring. So when i opened mine there was a little tab in the back, so all youve got to do is remove the battery case just twist. The cover and lift it off, then you can remove the isolation tab off the back of the battery and youre ready to go. All youve got to then do is download the app from the app store, whether youre on iphone or android. Just go on to your app store type in pocket meter and you can download it there really straightforward its really easy to connect it to so.
The meter itself, you might be thinking. Weve got these red and black tabs on each side there. All you do is pull like this and youve got your measurement probes here and then, when youre finished, with it theres a little button on the top there. You just press that and its automatically wound up. So in the box, you do get like these little wire. Clamps here – and they just push onto the probes like this – and i did speak to the pocket – the guys at pocket meter – and there may be some four millimeter banana type probes in the future, which of course, we know and love in the automotive testing world. However, all ive done for now is just uh bought. Some of these t pins. I think they use them in kind of textile and sewing, and all im going to do is use this as a back probe and poke that into the wire in the back of the connector and then clip the probe onto it like that. Okay, so if we open up the app here, we can see that well go into straight into the multimeter mode. When i did connect mine up, it came up with a battery low warning. I thought that was quite odd because it did come with a battery inhibitor. In the back there, so i did message the guys at pocket meter and they said there was a firmware update and that would fix that problem.
It was really easy to do and it did indeed fix it straight away. We had a full battery health showing on the display in the multimeter mode. Then weve got all of our features down the right hand. Side of the screen. Weve got our voltage settings ac dc and you can see that weve got maximum 60 volts dc and that is the maximum input in oscilloscope mode as well. It should cover most tests that wed expect to do on a car, so that should be good multimeter functions. Then we can see there weve just selected current mode, and it does give a warning just in case you were to forget that it was in current mode and connected up across the battery youre going to pop the fuse, however very thoughtful of pocket. They did put an extra fuse in the box just in case you do pop the fuse and really on here. Youve got uh. Some good features that youd expect to see on. You know a high range multimeter, so weve got a temperature set in there and theres. Actually, a temperature sensor inside the unit barmy 20 degrees here in the uk today and then youve got the continuity diode test and resistance features on there, as well so loaded with the functionality there so lets get on the car then and see what it can do. Okay, so just looking at the scale here, then weve got 0.00 millivolts. This would really be quite suitable for checking volt drop on fuses, its auto, ranging so youve got to be really careful with that.
If we connect it up to the battery now just go on the ground and the live here. You can see there that weve gone straight up to 12.75 volts weve got a good battery there and its its automatically adjusted the range to suit the measurement were taking. Okay, so well start up the car and its good. I can take it with me. Im sat in the car now with my phone turned on the ignition and the voltage has dropped a bit start the engine and there we are straight up to 14.8. Volts works. Really well so lets check out the logger function. This is similar to the multimeter function. You can do the same tests here. We can select the range weve got voltage, current and temperature, and the range we want here is 30 volts to capture up to nearly 15 volts intervals. You can set there. We want one second intervals and its going to tell us there. We can capture up to 103 minutes. It can actually go all the way up to eight months of data logging, which is pretty big. Okay, then all you do is press this red tab here to begin login and well go and start the engine. Okay were in ignition is on engine started, lets just let it settle. Okay, thatll do so when you want to finish your logging, you just hit that red tab again and you can see there that weve got our Music line on here.
We can long press to add a cursor on the screen. So if you press actually on the screen, where you want to measure, we can see there that weve got 12.68 there and then here where it goes up, weve got 14.84. If you hold on the tabs, you can actually drag the cursors around so just by clicking where the uh, where the number displays, so that could be useful for uh battery drains. Maybe if you set it up with a current shunt, rather than doing in line current two amps isnt very much and youll probably blow the fuse quite quickly. If you were to turn the ignition on or wake the car up – and let me know down below what you think you could use this logger function for as well. Okay, so now lets take a look at the oscilloscope, so what ive done is ive fitted a couple of t pins into that injector just there and well connect up the pocket meter and see what we get so well go for a 60 volt voltage scale well Set the time window well leave that at 250 milliseconds there lets press the red tab to record and well there we go check that out. We can actually zoom, then both ways just using your fingers and there weve got a nice injector waveform pattern. So, the same again, you can long press on the tab to put your uh measurements in put another one in there, and then we can zoom in and measure our injector opening time there.
So weve got just over four milliseconds and then a voltage peak of 49 volts. So one thing you might notice about this: is you dont get a live, oscilloscope view that you might do on your normal picoscope? It works more like a single trigger where you set the scope up hit record, and then it will display the readings that we get. So that was a pretty good signal. I did see on there that weve also got a trigger function, so lets have a play with the trigger function and see how it fares up on a diesel injector. Okay, so were going to connect up to the diesel injector on this bmw, 320 ive got the t pins here and ive bend them slightly, just so that they dont touch each other just so they kind of go out away from each other. Luckily, on this car, if they did touch each other, the worst that would happen is we dont get a misfire, however, depending on what youre measuring that could cause a short circuit, so well connect up the pocket meter then to the t: pins, okay, connect it up. Okay, so im in the car the engines running were connected up to the injector lets. Select oscilloscope voltage window were gon na, go with 60 volts because these diesel injectors operate on a slightly higher voltage time window. When you go for 25 milliseconds, we have got the option there for a rising trigger, but we cant actually adjust it until weve taken a measurement and at the minute there you can see that we didnt actually capture it.
So if we click on the rising trigger here, where the words are, we can move the trigger up and down and lets set the trigger to 15 volts, because we know its going to go above that and there we are okay. So its captured one of the injector signals there lets just capture again see if we can catch both of them there. We are okay, thats, pretty good. That is so weve got both of our injectors there, a pre and a post. We can zoom in a bit and weve got up to 40 volts there. So weve got 40 volts initial um activation. Then it goes down to a pulsing mode, and then we can see the spike at the bottom is where the solenoid is turned off. So that was pretty good now for the canvas test. Okay, so ive come up to my favorite measuring point on this uh e90. Bmw 4 powertrain can, of course, powertrain can isnt uh cant be reached at the obd plug on this car, so were just going into the fuel pump control module there, how weve connected it up for the one channel measurement, ive gone the redly to kanhai and the Black lead to can low and what were looking there for then is the difference between the two. So if you think about how these devices work and multimeters its looking at the difference between the red lead and the black lead, so when were at 2.
5 volts, we should have 2.5 volts on one lead 2.5 on the other. That means weve got a difference of zero, volts and thats. What our scope should read when we go to a message state on can so can high is going to go up to 3.5? Can low is going to go down to around 1.5? There weve got a difference of two volts, so thats what we should see when its transmitting a message on here: okay, so settings for this, because we are looking at a much lower voltage im going to select five volts as our voltage range and time window. Then im going to go really low im going to start with one millisecond lets uh hit capture, see what we get okay and there we go. Weve got a can message there. So, as expected, look weve got a zero volts that goes up to just over two volts and thats. Our can message there, so it actually picks up can its not as detailed as what you might expect on a picoscope unit. However, you know, would you expect from a keyring so whats the verdict then um? Well, i think its amazing im definitely going to be taking this everywhere with me, however, its not going to replace my picoscope um other test equipment, um, certainly the picoscope. You can do a lot more analysis and get a lot kind of clearer images due to the the higher sample rate for the screen size.
However, you know we did the basic multimeter functions there. We also captured some injectors and some canvas measurements theres.