Looks like we are moving out of the 61010 standards now. I've thought about trying to get my hands on a HV probe for the fun of it but price was more than I was willing to give up. It would be interesting to see how they are made.
Looks like we are moving out of the 61010 standards now. I've thought about trying to get my hands on a HV probe for the fun of it but price was more than I was willing to give up. It would be interesting to see how they are made.
Do you mean these Benning Duspol things?
Did some searching. Some of those non-contact overhead line detectors were good into the 400KV+ in wet weather conditions and safe.
IEC 61243-1: Live working - Voltage detectors - Part 1: Capacitive type to be used for voltages exceeding 1kV a.c.
IEC 61243-2: Live working - Voltage detectors - Part 2: Resistive type to be used for voltages of 1kV to 36kV a.c.
IEC 61243-3: Live working - Voltage detectors - Part 3: Two-pole low-voltage type
IEC 61243-6:2017(E) portable non-contact voltage detectors
I may look into getting 1-6. It's pretty interesting stuff.
I recently got an AN8008 mainly for the one microvolt resolution. I notice that the display reads zero between the range of -5uv and +5uv. I wonder if the manufacturer has recently done this purposely to try to hide drift.
I recently got an AN8008 mainly for the one microvolt resolution. I notice that the display reads zero between the range of -5uv and +5uv. I wonder if the manufacturer has recently done this purposely to try to hide drift.
I got my AN8008 last week and can confirm this, it shows only 0 when below +/-5uV. Have to do a better setup, maybe Dave can test this, too, it is jumping a bit. Additionally it feels like it has a little bit of hysteresis, so when dialing it down from 10uV to -10uV, it stays longer at 0uV until it jumps to some value less than -5uV.
I recently got an AN8008 mainly for the one microvolt resolution. I notice that the display reads zero between the range of -5uv and +5uv. I wonder if the manufacturer has recently done this purposely to try to hide drift.
I got my AN8008 last week and can confirm this, it shows only 0 when below +/-5uV. Have to do a better setup, maybe Dave can test this, too, it is jumping a bit. Additionally it feels like it has a little bit of hysteresis, so when dialing it down from 10uV to -10uV, it stays longer at 0uV until it jumps to some value less than -5uV.
I recently got an AN8008 mainly for the one microvolt resolution. I notice that the display reads zero between the range of -5uv and +5uv. I wonder if the manufacturer has recently done this purposely to try to hide drift.
I got my AN8008 last week and can confirm this, it shows only 0 when below +/-5uV. Have to do a better setup, maybe Dave can test this, too, it is jumping a bit. Additionally it feels like it has a little bit of hysteresis, so when dialing it down from 10uV to -10uV, it stays longer at 0uV until it jumps to some value less than -5uV.
Several people have picked up on this, but I don't think anyone has mentioned that the AN8002 and AN860B+ do it as well. These meters have less resolution, so it's +/-50uV in their case. This +/-5 LSB behaviour is clearly a function of the IC, but I wonder if it can be altered via the EEPROM?
I recently got an AN8008 mainly for the one microvolt resolution. I notice that the display reads zero between the range of -5uv and +5uv. I wonder if the manufacturer has recently done this purposely to try to hide drift.
I got my AN8008 last week and can confirm this, it shows only 0 when below +/-5uV. Have to do a better setup, maybe Dave can test this, too, it is jumping a bit. Additionally it feels like it has a little bit of hysteresis, so when dialing it down from 10uV to -10uV, it stays longer at 0uV until it jumps to some value less than -5uV.
Several people have picked up on this, but I don't think anyone has mentioned that the AN8002 and AN860B+ do it as well. These meters have less resolution, so it's +/-50uV in their case. This +/-5 LSB behaviour is clearly a function of the IC, but I wonder if it can be altered via the EEPROM?
I'm an electronics newb, so forgive me if this is a dumb question, but is this possibly an intentional "deadband" that they put in there due to excessive ADC jitter in that region? I deal with stuff like that on the software side of things at work, but I'm not an EE so I only have a fuzzy understanding of what the issues are on the electrical side of things. We apply a deadband in software to some of the ADC readings we get, for that reason (too much jitter near zero). But the stuff I work on is avionics related, with the ADCs embedded in various position sensors, etc. So I'm not sure if the same thing would apply to whatever's going on inside the DMM.
It could well be, if avionics don't require that level accuracy then I seriously doubt if most people involved in electronics do either, I expect that I'm about to get shot at here now but sometimes I cant help but wonder if the precision of meters that go to 3 4 or 5 significant digits after the decimal point aren't like a case of more bragging rights, similar to the 0 to 62mph time of a car?
It could well be, if avionics don't require that level accuracy then I seriously doubt if most people involved in electronics do either, I expect that I'm about to get shot at here now but sometimes I cant help but wonder if the precision of meters that go to 3 4 or 5 significant digits after the decimal point aren't like a case of more bragging rights, similar to the 0 to 62mph time of a car?
Sometimes you need high dynamic range which requires more digits.
It could well be, if avionics don't require that level accuracy then I seriously doubt if most people involved in electronics do either, I expect that I'm about to get shot at here now but sometimes I cant help but wonder if the precision of meters that go to 3 4 or 5 significant digits after the decimal point aren't like a case of more bragging rights, similar to the 0 to 62mph time of a car?
Sometimes you need high dynamic range which requires more digits.
Or you might want to watch a battery discharge - very small changes in voltage.
Is it really a requirement to watch every single mv? surely not, 5mv steps or even 10 mv steps should be enough.
I have little doubt that any "dead spot" techniques used in avionics would be specific to the task - and that the implications of doing so would have been well examined before implementing them in respect to anything that leaves the ground.