Any one Mod the DE-5000 for 1MHz Frequency

[Qmavam]

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

[JDubU]

It uses an integrated chipset that has a maximum test frequency of 100KHz. 
See attached datasheet.

[pantelei4]

I would like to see a mod to increase the test frequency to 1MHz

1MHz makes no sense for this device.
It does not work well at 100kHz.

[JDubU]

Cyrustek does have another chipset that will test at more frequencies (up to 250KHz).

http://www.cyrustek.com.tw/spec/ES168.pdf

[PedroDaGr8]

I would like to see a mod to increase the test frequency to 1MHz

1MHz makes no sense for this device.
It does not work well at 100kHz.

How so? Mine works just fine at 100kHz and based on a few cal standard I was able to test was well within specification.

[pantelei4]

How so?

There 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

[chronos42]

The dissaption factor D depends highly from the frequency, so this is a normal behaviour and not a failure of the DE-5000.

[pantelei4]

The dissaption factor D depends highly from the frequency, so this is a normal behaviour .

Not. 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.

[pantelei4]

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

[indman]

How so?

There 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

Yes, 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.

[pantelei4]

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?

They do not know about it.
You were the first to confirm this error de5000

[indman]

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.

[pantelei4]

I want to attach the photo with measurements of similar high-quality capacitors on the LCR MS5308(D_ESR_10_100kHz.jpg)

MS5308 works correctly
And touted de5000 must be smashed against the wall. 

[indman]

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?

[pantelei4]

pantelei4, You 're pretty demanding, DE-5000 doesn 't deserve that fate.

At a frequency of 100 kHz, you can’t believe him.
And at 10kHz the device does not have the necessary resolution
Here is another example of a snubber polypropylene capacitor measurement.

[indman]

At a frequency of 100 kHz, you can’t believe him.

At measurement of electrolytic capacitor i believe it at any frequency - such problems as i with a film capacitor at it am not present.

[pantelei4]

At measurement of electrolytic capacitor i believe it at any frequency - such problems as i with a film capacitor at it am not present.

If the device does not work correctly on film capacitors, then why will it correctly measure small-capacity electrolytic capacitors?

[indman]

pantelei4,Do you have proofs of it?
I will double-check on the electrolytes tomorrow.

[pantelei4]

pantelei4,Do you have proofs of it?

Electrolytic capacitors have poor parameters, so the measurement error will be small.

[pantelei4]

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.

[Trader]

How so?

There 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

Yes, 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.

for me all the values appear very close. what values did you expect to see?

[Trader]

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.

hum... 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?

[Shock]

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.