Rigol is definitely racking up the bugs with this DM858(E). Let's hope that future updates will resolve these problems. Otherwise, I'm switching to its competitor Siglent.
Yes, I hope that they fix it very soon. It is of course a new product, but maybe a little too early on the market. Let's see what will happen. (I didn't got a follow-up via my supplier Eleshop yet - regarding the DCV failure - 2 weeks ago)
@@marcelmostert3081 I received my DM858 much sooner than expected. I did the last firmware update 00.01.00.00.20 and I get exactly the same bugs. There's nothing more we can do, the ball is now in Rigol's court.
The behavior during the negative overload, even though it's a gross problem and shouldn't have been allowed to pass through the product engineering, doesn't look like a softare problem, but rather to the input analog front end, most prticularly the input op-amp. What it shows so clearly in the waveform and in the bargraph as well, resembles A LOT what is known as Phase Reversal, which happens to certain op-amps (especially FET input op-amps) when one of its inputs is pushed past the op-amps input common mode voltage range
Thanks for the answer. I am not sure, but I thought that Siglent Bench Multimeters SDM30XX does have a negative Overload indicator. It seems that Rigol is taking a different design approach. If this not solvable via a Software update then I wonder if Rigol will come with a future hardware update. I will watch this closely.
@@marcelmostert3081 Well, I can't be 100% sure, that it's an Op-Amp phase reversal effect, or some software bug. It just seems soooo much like phase reversal that it would be too much of a coincidence if it's not, and instead would be a software bug that behaves exactly like Op-Amp phase reversal. Anyway, if it's phase reversal, it can be remediated by increasing the power supply rail that the input voltage is getting too close, and clamping the input voltage before it reaches the point of causing phase reversal. Or changing the Op-Amp altogether, for onde that doesn't exhibit this quirk.
I recently bought a rigol dm858, after 4 days of use, its firmware corrupted in normal use, I was unable to recover the firmware and had to return it, the errors I managed to diagnose. 1st in automatic scale does not measure voltages between 32v and 40v, generating a consumption of 24ma. 2nd In automatic scale, if measuring high DC voltages in a PFC circuit, it generates a strong signal on the test tip. 3rd in slow mode the multimeter is extremely slow. The first two errors occur due to the change of scale from 1v to 10v where a relay is activated, this activation generates consumption. After 3 days of use, the multimeter showed a defect measuring 3Mohms and on the diode scale it showed a drop of 1,100v even without the tips connected, an internal NPN transistor in the multimeter leaked, its location is Q1, I opened the multimeter with authorization from the supplier Due to the warranty, I replaced the transistor and the defect was resolved, however, the next day, when using the math function and pressing the OK button, the multimeter system corrupted and I returned it. I recorded all these bugs that occurred, unfortunately the problem is hardware and not software. comprei um rigol dm858 recentemente, com 4 dias de uso a firmware dele corrompeu em uso normal, não consegui recuperar a firmware e tive que devolver, os erros que consegui diagnosticar. 1º em escala automatica não mede tensões entre 32v a 40v, gerando um consumo de 24ma. 2º Em escala automatica se for medir tensões DC altas em circuito PFC gera sentelha forte na ponta de prova. 3º em modo slow o multimetro é extremamente lento. Os dois primeiros erros acontecen por conta da troca de escala de 1v para 10v onde há um acionamento de um relê, nesse acionamento é gerado um consumo. Com 3 dias de uso o multimetro apresentou um defeito de medir 3Mohms e em escala de diodo apresentar queda de 1.100v mesmo sem ponteiras conectadas, um transistor NPN interno no multimetro apresentou fuga, localização dele é o Q1, abri o multimetro com autorização do fornecedor por conta da garantia, troquei o transistor e o defeito foi resolvido, porem no dia seguinte ao utilizar a função math e apertar o botão OK o sistema do multimetro corrompeu e devolvi. Gravei todos esses bugs que ocorreram, infelizmente o problema é de hardware e não de software.
This is really bad. I have worked a few weeks with my 858E version before I sent it back for "repair" due the DCV autoscale (32V / 24 mA) issue. It looks like the Hardware is not designed very well. Same applies if you have negative Overload. It shows no sign (so positive), which is incorrect. Especially if Trend scale is on. Will you get a new one?
Rigol is definitely racking up the bugs with this DM858(E). Let's hope that future updates will resolve these problems. Otherwise, I'm switching to its competitor Siglent.
Yes, I hope that they fix it very soon. It is of course a new product, but maybe a little too early on the market. Let's see what will happen. (I didn't got a follow-up via my supplier Eleshop yet - regarding the DCV failure - 2 weeks ago)
@@marcelmostert3081 I received my DM858 much sooner than expected. I did the last firmware update 00.01.00.00.20 and I get exactly the same bugs. There's nothing more we can do, the ball is now in Rigol's court.
@@marcelmostert3081 Thanks for the follow-up.
I am planning to buy rigol, dm 858e, your final advice


The behavior during the negative overload, even though it's a gross problem and shouldn't have been allowed to pass through the product engineering, doesn't look like a softare problem, but rather to the input analog front end, most prticularly the input op-amp.
What it shows so clearly in the waveform and in the bargraph as well, resembles A LOT what is known as Phase Reversal, which happens to certain op-amps (especially FET input op-amps) when one of its inputs is pushed past the op-amps input common mode voltage range
Thanks for the answer. I am not sure, but I thought that Siglent Bench Multimeters SDM30XX does have a negative Overload indicator. It seems that Rigol is taking a different design approach. If this not solvable via a Software update then I wonder if Rigol will come with a future hardware update. I will watch this closely.
@@marcelmostert3081 Well, I can't be 100% sure, that it's an Op-Amp phase reversal effect, or some software bug.
It just seems soooo much like phase reversal that it would be too much of a coincidence if it's not, and instead would be a software bug that behaves exactly like Op-Amp phase reversal.
Anyway, if it's phase reversal, it can be remediated by increasing the power supply rail that the input voltage is getting too close, and clamping the input voltage before it reaches the point of causing phase reversal.
Or changing the Op-Amp altogether, for onde that doesn't exhibit this quirk.
I recently bought a rigol dm858, after 4 days of use, its firmware corrupted in normal use, I was unable to recover the firmware and had to return it, the errors I managed to diagnose.
1st in automatic scale does not measure voltages between 32v and 40v, generating a consumption of 24ma.
2nd In automatic scale, if measuring high DC voltages in a PFC circuit, it generates a strong signal on the test tip.
3rd in slow mode the multimeter is extremely slow.
The first two errors occur due to the change of scale from 1v to 10v where a relay is activated, this activation generates consumption. After 3 days of use, the multimeter showed a defect measuring 3Mohms and on the diode scale it showed a drop of 1,100v even without the tips connected, an internal NPN transistor in the multimeter leaked, its location is Q1, I opened the multimeter with authorization from the supplier Due to the warranty, I replaced the transistor and the defect was resolved, however, the next day, when using the math function and pressing the OK button, the multimeter system corrupted and I returned it. I recorded all these bugs that occurred, unfortunately the problem is hardware and not software.
comprei um rigol dm858 recentemente, com 4 dias de uso a firmware dele corrompeu em uso normal, não consegui recuperar a firmware e tive que devolver, os erros que consegui diagnosticar.
1º em escala automatica não mede tensões entre 32v a 40v, gerando um consumo de 24ma.
2º Em escala automatica se for medir tensões DC altas em circuito PFC gera sentelha forte na ponta de prova.
3º em modo slow o multimetro é extremamente lento.
Os dois primeiros erros acontecen por conta da troca de escala de 1v para 10v onde há um acionamento de um relê, nesse acionamento é gerado um consumo.
Com 3 dias de uso o multimetro apresentou um defeito de medir 3Mohms e em escala de diodo apresentar queda de 1.100v mesmo sem ponteiras conectadas, um transistor NPN interno no multimetro apresentou fuga, localização dele é o Q1, abri o multimetro com autorização do fornecedor por conta da garantia, troquei o transistor e o defeito foi resolvido, porem no dia seguinte ao utilizar a função math e apertar o botão OK o sistema do multimetro corrompeu e devolvi. Gravei todos esses bugs que ocorreram, infelizmente o problema é de hardware e não de software.
This is really bad. I have worked a few weeks with my 858E version before I sent it back for "repair" due the DCV autoscale (32V / 24 mA) issue. It looks like the Hardware is not designed very well. Same applies if you have negative Overload. It shows no sign (so positive), which is incorrect. Especially if Trend scale is on. Will you get a new one?
@@marcelmostert3081 I returned the multimeter, it had only been 4 days since I bought it, I tried everything but I couldn't reinstall the software.