Any one Mod the DE-5000 for 1MHz Frequency - Page 1
Forum section: electronics / testgear

author: Qmavam
author_rank: Regular Contributor
timestamp: August 19, 2019, 02:48:40 pm
content: I would like to see a mod to increase the test frequency to 1MHz, I would give up the 100Hz test frequency for a 1MHz test frequency.I don't know the circuit and I don't know if parasitics would make it unfeasible, but maybe they would cal out.Anyone thought about this?Mikek

author: JDubU
author_rank: Frequent Contributor
timestamp: August 19, 2019, 04:15:46 pm
content: It uses an integrated chipset that has a maximum test frequency of 100KHz.See attached datasheet.

author: pantelei4
author_rank: Regular Contributor
timestamp: August 19, 2019, 04:30:00 pm
content: Quote from: Qmavam on August 19, 2019, 02:48:40 pm1MHz makes no sense for this device.It does not work well at 100kHz.

author: JDubU
author_rank: Frequent Contributor
timestamp: August 19, 2019, 04:43:41 pm
content: Cyrustek does have another chipset that will test at more frequencies (up to 250KHz).http://www.cyrustek.com.tw/spec/ES168.pdf

author: PedroDaGr8
author_rank: Super Contributor
timestamp: August 19, 2019, 05:24:02 pm
content: Quote from: pantelei4 on August 19, 2019, 04:30:00 pmHow so? Mine works just fine at 100kHz and based on a few cal standard I was able to test was well within specification.

author: pantelei4
author_rank: Regular Contributor
timestamp: August 19, 2019, 07:10:06 pm
content: Quote from: PedroDaGr8 on August 19, 2019, 05:24:02 pmThere are some values at which at 100 kHz it shows the wrong loss or ESR.For example, a 2μF capacitor at the edge of the range

author: chronos42
author_rank: Regular Contributor
timestamp: August 19, 2019, 07:56:32 pm
content: The dissaption factor D depends highly from the frequency, so this is a normal behaviour and not a failure of the DE-5000.

author: pantelei4
author_rank: Regular Contributor
timestamp: August 19, 2019, 08:03:42 pm
content: Quote from: chronos42 on August 19, 2019, 07:56:32 pmNot. This is an mkp capacitor and D cannot grow 100 times with a frequency increase of 10 times. I have powerful polypropylene capacitors with which the device behaves the same. But at 100nF everything is in order and there is no such increase in losses.I think that the problem is that at high frequency the signal level is small with increasing capacitance and the meter simply unstable.

author: pantelei4
author_rank: Regular Contributor
timestamp: September 08, 2019, 05:07:43 am
content: Can anyone check a significant increase in the D factor on their device?And also the presence of constant voltage on the probes.On mine there is -8mV, and on DE-5000 my friend has -16mV

author: indman
author_rank: Super Contributor
timestamp: September 09, 2019, 11:27:54 am
content: Quote from: pantelei4 on August 19, 2019, 07:10:06 pmYes, I confirm your words. I paid attention to very strange values D and ESR which 100 kHz at high-quality film capacitors for a long time. I assume that all this a lack of circuit engineering of DE-5000 as judging by responses from owners of Mastech MS5308M, there are no such problems? Or I am mistaken?As for shift on constant voltage - I measure on the multimeter value - 4 mV on a test signal of 1 kHz with the connected capacitor.

author: pantelei4
author_rank: Regular Contributor
timestamp: September 09, 2019, 02:02:30 pm
content: Quote from: indman on September 09, 2019, 11:27:54 amThey do not know about it.You were the first to confirm this error de5000

author: indman
author_rank: Super Contributor
timestamp: September 10, 2019, 11:11:37 am
content: I want to complement the previous message with more detailed information which I saved at measurement of film capacitors and showed on a photo.Also I want to attach the photo with measurements of similar high-quality capacitors on the LCR MS5308(D_ESR_10_100kHz.jpg) measuring instrument which to me was sent by my acquaintance on a forum Yury.

author: pantelei4
author_rank: Regular Contributor
timestamp: September 10, 2019, 02:27:26 pm
content: Quote from: indman on September 10, 2019, 11:11:37 amMS5308 works correctlyAnd touted de5000 must be smashed against the wall.

author: indman
author_rank: Super Contributor
timestamp: September 10, 2019, 02:38:07 pm
content: pantelei4, You 're pretty demanding, DE-5000 doesn 't deserve that fate.Still interesting, because both MS5308 and DE-5000 are built on the same chips! What 's the difference in circuit engineering?

author: pantelei4
author_rank: Regular Contributor
timestamp: September 10, 2019, 02:55:37 pm
content: Quote from: indman on September 10, 2019, 02:38:07 pmAt a frequency of 100 kHz, you can’t believe him.And at 10kHz the device does not have the necessary resolutionHere is another example of a snubber polypropylene capacitor measurement.

author: indman
author_rank: Super Contributor
timestamp: September 10, 2019, 03:05:45 pm
content: Quote from: pantelei4 on September 10, 2019, 02:55:37 pmAt measurement of electrolytic capacitor i believe it at any frequency - such problems as i with a film capacitor at it am not present.

author: pantelei4
author_rank: Regular Contributor
timestamp: September 10, 2019, 03:51:05 pm
content: Quote from: indman on September 10, 2019, 03:05:45 pmIf the device does not work correctly on film capacitors, then why will it correctly measure small-capacity electrolytic capacitors?

author: indman
author_rank: Super Contributor
timestamp: September 10, 2019, 04:14:04 pm
content: pantelei4,Do you have proofs of it?I will double-check on the electrolytes tomorrow.

author: pantelei4
author_rank: Regular Contributor
timestamp: September 10, 2019, 04:24:58 pm
content: Quote from: indman on September 10, 2019, 04:14:04 pmElectrolytic capacitors have poor parameters, so the measurement error will be small.

author: pantelei4
author_rank: Regular Contributor
timestamp: September 10, 2019, 04:28:17 pm
content: In my opinion, the device incorrectly measures the series resistance of inductances at all frequencies.It is enough to measure the primary primary winding of a conventional transformer and compare it with DC resistance.

author: Trader
author_rank: Frequent Contributor
timestamp: February 22, 2022, 11:37:54 pm
content: Quote from: indman on September 09, 2019, 11:27:54 amfor me all the values appear very close. what values did you expect to see?

author: Trader
author_rank: Frequent Contributor
timestamp: February 22, 2022, 11:41:13 pm
content: Quote from: indman on September 10, 2019, 11:11:37 amhum... so the values from 10 kHz and 100 kHz should be practically the same? why, because are good capacitors? no changes in this big range?

author: Shock
author_rank: Super Contributor
timestamp: February 23, 2022, 08:34:47 am
content: Don't start this thread up again there are two other threads on this BS, it's a bumbling mess.In summary they are saying it makes inaccurate measurements out of spec, which is obvious. He compares it to another LCR meter with less error seemingly for justification.Nowhere is the full setup and testing method fully defined and since it's not even a valid measurement, noone cares. It's also off topic from the original post, there is no mod for the DE5000 it has a dedicated chipset, you can't just redesign it.