Products > Test Equipment

East tester ET432 vs Der EE DE-5000 Comparison

<< < (3/9) > >>

NoMoreMagicSmoke:

--- Quote from: Martin72 on May 16, 2023, 10:02:18 pm ---For the price the DE5000 is unbeatable, the ET4410 is "better" but cost much more (appx 300).
Little bit surprising that the ET432 performs worse vs DE5000.
Reading it´s manual, the part with the accuracy, makes you mad...Diagrams, formulars, tables, correction factors... :P
But it would be interesting to find out why it´s getting partly out of it´s own specs*.
Nevertheless, the ET433 is interesting because of the free adjustable testfrequencies.


*)At the end the shown values are calculation results, so the "frontend" must be the cause.

--- End quote ---

Curiosity got the better of me again, and I decided to try to see if I could determine what might cause the 100KHz resistance measurement errors.

I found that in the 100Khz range the output voltage drops from and expected 610mV at the lower frequencies to 440mV. If it's doing its calculations thinking the voltage is still 600mV that would certainly be a cause of error. The DE does not exhibit this behavior. The DE has is off for about a second when switching ranges, but then rapidly recovers to about 630mV.

It appears (speculation on my part) like the ET is controlling the voltage open loop, and the DE has feedback that ensures the voltage is constant.

NoMoreMagicSmoke:

--- Quote from: Martin72 on May 16, 2023, 10:02:18 pm ---For the price the DE5000 is unbeatable, the ET4410 is "better" but cost much more (appx 300).
Little bit surprising that the ET432 performs worse vs DE5000.
Reading it´s manual, the part with the accuracy, makes you mad...Diagrams, formulars, tables, correction factors... :P
But it would be interesting to find out why it´s getting partly out of it´s own specs*.
Nevertheless, the ET433 is interesting because of the free adjustable testfrequencies.


*)At the end the shown values are calculation results, so the "frontend" must be the cause.

--- End quote ---

So, I heard back from the seller, and they are insistent that the meter is operating normally. First, they tried to blame it on the resistor itself, then when I showed them the DE vs ET measurements, they said the difference is because the ET is a 5 digit, and the DE is only showing 4 digits.  :-DD

I did get them to agree to sending me out a replacement set of Kelvin clips, but they said they would provide tracking and I still have not received tracking information 3 days later.

Martin72:
Most of the sellers don´t have any clue, they´re only selling something from somewhere to someone. ;)


--- Quote ---I found that in the 100Khz range the output voltage drops from and expected 610mV at the lower frequencies to 440mV.
--- End quote ---

How did you measure this ?


--- Quote ---If it's doing its calculations thinking the voltage is still 600mV that would certainly be a cause of error
--- End quote ---

It´s calculating with the measured values.

NoMoreMagicSmoke:

--- Quote from: Martin72 on May 20, 2023, 08:19:52 pm ---Most of the sellers don´t have any clue, they´re only selling something from somewhere to someone. ;)


--- Quote ---I found that in the 100Khz range the output voltage drops from and expected 610mV at the lower frequencies to 440mV.
--- End quote ---

How did you measure this ?


--- Quote ---If it's doing its calculations thinking the voltage is still 600mV that would certainly be a cause of error
--- End quote ---

It´s calculating with the measured values.

--- End quote ---

I am not surprised about the seller, I am more surprised that their response is basically "Don't use that range"  |O. The seller is listed as "East Tester Factory Store" That means the seller is directly the factory... Right??? Right???  :-DD

I measured the voltage with both a Fluke 189 as well as an oscilloscope. I am certain that my measurement affected the voltage some, but I listed it mostly to point out a difference between the DE (No voltage change) and the ET (drops demonstrably.

The more I did into the ET, the more it confuses me. How on earth are they making a 40k count meter when the only DAQ on the meter is the 12 bit DAQ built into the CPU???

Martin72:

--- Quote ---I measured the voltage with both a Fluke 189
--- End quote ---

Ah, good(100khz trms)


--- Quote ---as well as an oscilloscope.
--- End quote ---

Better..


Hm-hm...

--- Quote ---10M 0.5% carbon resistor
Meter   DCR                 100Hz            1KHz              100Khz
DE       10.080MOhm    9.996MOhm    9.998MOhm    OL
ET        9.901MOhm     9.905MOhm     6.311MOhm   14.075KOhm
--- End quote ---

You´ve made it also with a 20k - Would be interesting if you can test some more resitors, say between 1k and 1M.



Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod