#228 

Thorough review as always, and enjoy your upbeat attitude! Many thanks.

I also have the same Siglent 6.5 digit meter and the DMMCheck Plus. I find the Siglent needs a good half hour to fully warm up and become stable. After that it is always spot on and confirmed with a similar Fluke.. Thanks for your reviews.

A very nice review Tony. Seems your meters are quite acceptable and within tolerance. A nice piece of equipment for DMM calibration... 10/10

Looks a lot better and more useful than the others. Seems like a decent bit of kit :)

I remember that Ian Johnston from UK also makes nice devices (based on LM399A). But these are more expensive (300UKP). There is also a re-calibration service for these devices for around 32UKP. Sadly not inside EU anymore..

On the DMM check plus dual frequency option, what are the 2 most useful frequency options to select for general purpose use?

Sorry I’m late to the picnic here… Very nice review I have seen these and went to the website. It would be nice to see a show down of all your references / standards.

Friend, good afternoon! I like this calibration subject and I've been watching your videos. I don't have a bench multimeter and was wanting to buy one, now I'm in doubt. I have a used Fluke 8845A in good condition for a reasonable price, I confess I don't like used things, but maybe I don't need a 6 1/2 digits, maybe a 4 1/2 digits will break the branch. What would be better to buy a used 6 1/2 in good condition or buy a new 4 1/2. Which 4 1/2 do you recommend? Ícone "Verificada pela comunidade"

Just ordered one of these! cost about $231USD fully loaded and delivered. Not to bad for what it is, now I can calibrate the rest of my equipment.

Hello Tony and Followers: I'm not sure I have written it on this channel, but before doing so I have to say that I admire your work a lot, and that the device is interesting, but I will comment on certain things about which I do not like. (1º) Voltage references are with respect to a calibrator only 5% of useful. (2º) When a manufacturer erases the references of the integrated circuits is no longer my confidence because it is the technique that Chinese manufacturers of little confidence and little importance are used. (3rd) The alternating tension measures must be made at a given frequency, usually 400 Hz is the measurement most used by multimeter manufacturers except for some exception. (4th) This and any tension reference have the great disadvantage of working and being effective in a single voltage range, not being useful in others regardless of the multimeter digits. (5th) Sometimes errors are made in the AC measurements, as the multimeters can not be calibrated effectively and sometimes they really measure well, but in these cases, always, the waveform in the oscilloscope has always been looked at. It is the only way to know if the wave is adequate, clean and uniform. Many bank multimeters of which I have measured with 7 ½ digits and when they measure AC become unstable, the cables I use are normally shielded (RG 58 A / U thousand is a good option) with bananas on both sides and the screen connected to Earth / Mass / Guard so that the effectiveness is good. To measure AC precisely 6 ½ it is very, very complicated with traditional tension division and rectification systems of the input wave, systems with thermal transfer or similar must be used and these despite being the best can still be Be unstable to 6 ½ digits. Your video as always 1000%, and also 100% to brands that disinterestedly send you your products to make these great videos. A hug Manuel C.V.

From my conversation with singlet in my 6.5 digit when having that 6mv+ error the factory cal set it back to the factory stored calibration constants from the last calibration preformed.

Hello how are you !!, With the voltage reference that you showed, remember that I am looking for electrical reference standars, unfortunately in America you only see fluke which is quite expensive, searching the network I found the time electronics company from England, the bad is that I would not know where to look for reference prices to see if it is more economical or not than fluke, I really want to buy a multifunction calibrator, and I must be very sure which one to buy since they are quite expensive. Do you have any information or any recommendation that can help me?

I think the AC Voltage and AC current are square wave so not RMS sine wave which you need to test multimeters. The leads you used for the voltage test were not the best as the leads used during any calibration will cause small errors (can be microvolt errors) caused by temperature, types of materials that make up the leads, the croc clips and the connections on the DMM check box its self. Copper or gold connections would help reduce the errors. Normally a calibrator or multimeter would have dedicated test leads which have known errors or are calibrated with the calibrator or multimeter. The 4 wire resistance test was better than 2 wire but you still should check the short circuit of the leads as there "might" be a small milli ohm error. The construction of the DMM check isn't the best as its open to air flow across the components, especially the voltage reference. The voltage reference and other components can cause temperature coefficient errors. Also do the batteries cause a small increase in temperature when the DMM check box is turned on? What frequency were the capacitors tested at compared to the test frequency of you meter? If tested at 1 kHz and your meter uses 120 Hz there will be an additional error. Test lead error can be 20 pF or more. The DMM check box might be good enough for a 3.5 digit multimeter but not anything better. You can build a simple voltage reference with values from 10 mV to 100 V DC and an AC voltage (sine wave) at 40 Hz to 20 kHz covering the same voltage range. DC & AC current as well as resistance, capacitance can be added. The better option would be to have a calibrated meter (6.5 digit) and use this as your reference connecting the meter under test in parallel at the 6.5 digit meters terminals with good quality leads. AC test leads and when testing high resistance values you can use a coax lead with good quality 4mm plugs on.

You are right to doubt of Siglent 3065X. Until the Keythley(DMM6500) has arrived on my bench, I was pretty sure about it. But I have found + 680 uV DC as against Keythley. Fluke 289 is also with Keythley on DC. Great review, keep up with this!!!

good.... tony,, do u know any bench top multi channel temperature monitor,,, or logger,, for cheap... no batteries

They ask you for a fair review? Haha Well they won’t get a more fare reviewer than Tony! As always great video! That is a bummer about calibration! If it did revert Siglent should not make it that easy! Let us know hope this is not the case!

Might have better if it skipped being a Jack of all trades and just made a temperature stable 5v/10v reference.

this item has ac v,,, but does not state freq

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4.neinneinnein ! XD