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In this episode Shahriar reviews the ITECH IT9121 Digital Power Meter. The IT9100 power meter series can provide up to 1000Vrms and 50Arms and measurement bandwidth of 100KHz. The instruments can measure voltage, current, power, frequency, harmonics and other parameters. The standard configuration includes USB, GPIB, RS232 and LAN communication interfaces and also interfaces for USB-based peripheral devices. The basic voltage and current accuracy is 0.1%.
www.itechate.com/en/product/p...
This review is organized as follows:
00:00 - Introduction, interfaces, front & back panel
03:37 - IT-E185 AC Interface accessory overview
05:01 - Complete teardown, architecture analysis, mixed-signal design
15:46 - GUI overview, measurement capabilities, analysis types
18:03 - Included interface cables, DC accuracy and capability measurements
20:45 - AC measurements, PF, S, THD, Phase, Frequency measurements
26:45 - Characterization of an Anker USB-C 60W chargers and USB-C battery pack
33:13 - Characterization of an LED light bulb with external Triac dimmer circuit
36:52 - PC software capabilities and overview
38:02 - Concluding remarks
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Пікірлер: 71

@killymxi 3 жыл бұрын

Mic noise pick-up increase at 35:40 is a nice addition to the demonstration :)

@mikeselectricstuff 3 жыл бұрын

I doubt the relay contacts are part of the current measurement path - you'd normally measure it differentially across the sense resistor itself.

@Thesignalpath 3 жыл бұрын

Yes, I agree. Thanks Mike.

@InssiAjaton 3 жыл бұрын

Congratulations! You have come back from your (tens of) gigahertz frequencies... In fact occasionally even below the power line 50 or 60 Hz, as shown by the Keithley sourcemeter putting out DC. Joking aside, I liked your presentation at this end of the frequency spectrum.

@TeslaTales59 3 жыл бұрын

Great demo- good use of practical devices

@xyzconceptsYT 3 жыл бұрын

Thanks for the great review, Shahriar. One day I'll get something like this on my bench. 😀

@gmills5763 2 жыл бұрын

These are really useful and enjoyable to watch. Hope your lectures show up on YT or somewhere when you start teaching ☺

@leppie 3 жыл бұрын

You could really hear the interference around 36 minutes. Not sure if that was intended, but was very clear on headphones. Also it says srcoll :D

@TheFool2cool 3 жыл бұрын

Yeah what is he doing messing around with this? Its not the usual high end instrument he heads for.

@Thesignalpath 3 жыл бұрын

@@TheFool2cool Because I need something like this for my repairs.

@lazyman114 3 жыл бұрын

Yeah I think he's picking up the 60Hz noise from touching the dimmer. The noise travels probably through his body and into the mic preamp.

@ruhnet 3 жыл бұрын

It was the increased harmonics being radiated that he was talking about when he lowered the dimmer. Real life example of what nasty power waveforms do. 😀

@joehubler4965 3 жыл бұрын

nice job as usual!

@ConicalTechnologies 3 жыл бұрын

Very useful information!!

@kevin666b 3 жыл бұрын

A+++ content right here.

@NaudioElectronics 3 жыл бұрын

Excellent review! Thank you

@barzelschmidt9077 3 жыл бұрын

We have used this analyzer to test inverter appliances like air conditioners and it is very useful

@PixelSchnitzel 3 жыл бұрын

The best part is that the app allows you to exit to AOL! (starting around 37:00) AOL . . . LOL. Fantastic review as always. As soon as you panned to the Wall O' Keithley™, I blew coffee out my nose. Actually, I had to go brew a cup, but still . . .

@supercompooper 3 жыл бұрын

I love this. I'm buying one. So many uses.

@oriole8789 3 жыл бұрын

I believe you're missing an "I" in the model name in the video title and description. It should be IT9121. I've seen ITECH products before - was always curious about value and build quality. Very good all around, a nice surprise. Thanks a lot for the review!

@Thesignalpath 3 жыл бұрын

Thanks for letting me know.

@wilcostienezen9403 3 жыл бұрын

Good and cool device!

@Gengh13 3 жыл бұрын

A Signal Path video working in the Hz region? Who are you and what have you done to Shahriar.

@Thesignalpath 3 жыл бұрын

Hehe... We will be back to multi-GHz next.

@SidneyCritic 3 жыл бұрын

Maybe similar. We had problems with the CH340 IC on cheap Arduinos dropping out with the Win driver, switched to the manufactures CH340 driver and it's fine. Maybe there is a better chip driver.

@jangoofy 3 жыл бұрын

30:00 - the phase shift is likely calculated based direct of the power factor that in turn is calculated as W/VA.

@rogeronslow1498 3 жыл бұрын

Excellent review. I suspect there's a Kelvin connection to the current sense resistors so the relay contact resistance is irrelevant. I have a Voltech PM100 which is excellent but now seems obsolete compared the this instrument.

@jangoofy 3 жыл бұрын

Contact resistance in relays are for sure irrelevant, just as the user cables going to/from the current input

@taylorlindley5578 3 жыл бұрын

I just want to take a minute and appreciate that beautiful shelf full of keithleys at 18:40 😁

@hydron7833 3 жыл бұрын

We didn't even see the end of it - could be infinite Keithleys! Shahriar, could you pan across the rack at some point in a future video?

@Thesignalpath 3 жыл бұрын

It is Keithleys all the way around! :)

@thomasw6169 3 жыл бұрын

Keithley collector ?

@taylorlindley5578 3 жыл бұрын

@@thomasw6169 a keithley connoisseur

@thomasw6169 3 жыл бұрын

@@taylorlindley5578 note to myself: I'm not envious. Who needs a SMU anyway ? 😀

@kamikazekk-df4vz 3 жыл бұрын

I was very curious about itech products, I seen the new PSU, especially the ac ones and I was interested to know the quality in general, so very appreciated!

@wadehsu2347 3 жыл бұрын

Itech is the OEM for a lot of BK Precision's and Keithley's power supplies and electronics load. So I think quality for Itech products are generally pretty good.

@kamikazekk-df4vz 3 жыл бұрын

@@wadehsu2347 thanks! As I said , I seen they're new products (DC load, ac load and PSU) and all these seems good enough, now I know the reason.

@DarkTyr2 3 жыл бұрын

The LED lamp was a good thing to look at with real world applications, but could have also done an a good/bad ATX power supply (80+ versus 80+ Gold) or even a piece of equipment in the lab (CW source, VNA, SA).

@Orbis92 3 жыл бұрын

I can't say much to the power meter, but I really like what looks like a super-cap buffered coin cell, so you wouldn't even lose date if the coin cell is being replaced :)

@drdiesel1 3 жыл бұрын

Might have to upgrade my Voltech PM100.

@douro20 3 жыл бұрын

I'd like to see a Voltech PM-300. I know you have a PM-3000A but the PM-300 is more capable and it has a full graphic LCD for displaying plots and graphs.

@manytoolsmike 3 жыл бұрын

Thank you very much for this review. I am considering this instrument for Ultrasonic Transducer Power measurements. The data sheet claims 100 kHz bandwidth. I need to measure power for 18kHz to 45kHz signals. Voltage is 100 to 300 Vac and the power is around 10 watts. I want Apparent Power and Power Factor corrected values. The wave forms can be quite distorted as we drive a square wave through a step up output transformer then into a Piezo . We are operating the Piezo well outside its resonant frequency and I want accurate power measurements of this signal. Any recommendation for an instrument that will do this?

@hateercenor 3 жыл бұрын

I'm concerned that if you attach a GPIB cable the power input will be blocked or the cable will conflict with the side of the case.

@kariputtonen 3 жыл бұрын

Otherwise really good looking GUI, but in quite a few places the smaller numbers right side is being clipped by pixel or two. Nothing major but noticeable in big screen.

@tchiwam 3 жыл бұрын

I wish they had a 3 phases AC current supply.

@xDevscom_EE 3 жыл бұрын

I've used ITECH DC loads back in 2012-2014, and I see they still have poor software quality even today :) Otherwise quite cost effective instruments!

@Thesignalpath 3 жыл бұрын

Yes, the software itself would be good if it worked and maintained the connection.

@barzelschmidt9077 3 жыл бұрын

I have an IT8512A+ load, once contacted the ITECH engineers to upgrade its software, you can also contact them. As far as I know, their software of load has several updates in recent years.

@monicahu5884 3 жыл бұрын

Now the free PV9000 software can be downloaded, since 2015, they upgraded all softwares, it's much better GUI

@hamidsk2573 3 жыл бұрын

it is possible to set the radio frequency(FM) with a digital circuit such as MCU, I mean digitally change the variables of LC parameters

@jimomertz 3 жыл бұрын

I didn’t like that voltage wire draping over the heat sink. They could have made it a bit longer. Maybe that heat sink doesn’t get that hot to worry about melting through eventually 🤔

@Thesignalpath 3 жыл бұрын

The voltage wire had a protective sleeve, but it is also silicone and won’t melt. I don’t think this will not be an issue.

@AndrewZonenberg 3 жыл бұрын

18:39 just how many SMUs do you have in your lab???

@todayonthebench 3 жыл бұрын

A power factor of .6 is fairly "decent", though I have been wondering how effectively we could clean it up with just an AC 50/60 Hz band-/low-pass filter. Ideally, a power supply should have as close to 1 as possible as its power factor, even if this can be costly to implement.

@samfedorka5629 3 жыл бұрын

"AC 50/60 Hz band-/low-pass filter." This is essentially what passive power factor correction does, however if your PFC does not change much with load you can just cancel the reactive component with a passive of the opposite value. For higher power systems, Active PFC has become the norm, which has driven cost of active PFC down considerably in the last 10 years.

@todayonthebench 3 жыл бұрын

@@samfedorka5629 My question weren't though if it works, but rather how much impact it has. I know Active PFC costs only a dollar or three in production as is for "moderate" power loads. (like the low of hundred watts.) I have though been somewhat surprised that there isn't a simple single chip solution for it yet... After all, half decent active PFC isn't actually hard to implement. (I have seen plenty of controllers, but I would love to see a TO-220 with controller, inductor and switching transistor all in one package. Or a TO-92 for lower power applications.) (Active PFC is practically a boost converter that is primarily controlling its PWM as a function of the rectified mains input voltage, and then has offset governed by a box car average of our output voltage during the last couple of cycles. Then we just have our main's filter cap between our PFC and our main SMPS converter. To prevent over volting our output we will let the average of the control offset increase a bit faster than it decreases. Of course our output cap should also not be operated at it's peak voltage, we should have a decent margin. And yes, a PCF like this will output the same output voltage regardless of input voltage. Something that is nice in SMPS designs.)

@ToniT800 3 жыл бұрын

@ 16:33 "You can get all the information you want". Does it also show the buoyancy of your cat?

@jusaca01 3 жыл бұрын

Current traces in blue and voltage traces in red? I call that insanity! :D Otherwise, pretty cool power meter =)

@kanetw_ 3 жыл бұрын

How do you think this compares to the R&S HMC8015?

@Thesignalpath 3 жыл бұрын

That is a good question! If I ever get one, I will compare them.

@assistenciatecnicaemmicrof8817 3 жыл бұрын

Hi , the first ones here I am

@gerhardkorf4591 3 жыл бұрын

The price of this is very similar to a Keithley DMM6500. As I already bought one, a few months back, based on Shahriar channel, it sounds to me that a second Keithley with a bit of software will be better value for money, not to mention all the additional things I can do with 2 keithleys. Even with my single DMM6500 and a few software add-ons and an external amp meter probe, you can measure most of this. I guess my point is that the Keithley DMM6500 is very good value for money. This ITech look like "ok value for money" compared.

@gerhardkorf4591 3 жыл бұрын

btw, that Keithly is running 24/7 a analog temp sensor, and it's amaizing what you can learn from a 6.5 digit temp measure (if you plot it over time). It picks up when I enter the room. I use something like this: www.dfrobot.com/product-164.html HF is cool, but hi-res is also in a same way very satisfying. with nano amps you can create ECG by just holding the 2 probes (one in mouth and other on stomach give better results :))