Johnson777717
New Member
Heya folks! I need some assistance again, if I may?
Is it possible to create an accurate micro-ohm meter with a common digital panel meter?
I'm working on an ESR circuit that calls for an analog 100 micro ohm meter which in turn outputs "resistance" within a 0.1Ohm tolerance ( I think, anyway, the tolerance is pretty tight).
I've been using a digital panel meter PM128E for most of my projects that involve some sort of display (voltmeter, ammeter etc). The PM128 is setup to read a 200mA scale, but I don't know what the tolerance is for this particular meter. I'm thinking theoretically, I can break the scale down to 200uA with a voltage divider, but the question of accuracy arises.
What do you folks think? Should I just stick with the analog meter? I'm not really looking to go with a tight tolerance panel meter, because of the cost concerns. I just can't justify a $40 panel meter for a simple ESR meter, when an analog meter is available for $10 or so. Although, if I can get good accuracy with a regular panel meter which costs $12, then so be it. Oops, I just found out that the panel meter is +-0.5% accuracy at full scale. So I may have answered my own question. Still....
Any advice? Thank you for your time.
Panel meter example.
**broken link removed**
Is it possible to create an accurate micro-ohm meter with a common digital panel meter?
I'm working on an ESR circuit that calls for an analog 100 micro ohm meter which in turn outputs "resistance" within a 0.1Ohm tolerance ( I think, anyway, the tolerance is pretty tight).
I've been using a digital panel meter PM128E for most of my projects that involve some sort of display (voltmeter, ammeter etc). The PM128 is setup to read a 200mA scale, but I don't know what the tolerance is for this particular meter. I'm thinking theoretically, I can break the scale down to 200uA with a voltage divider, but the question of accuracy arises.
What do you folks think? Should I just stick with the analog meter? I'm not really looking to go with a tight tolerance panel meter, because of the cost concerns. I just can't justify a $40 panel meter for a simple ESR meter, when an analog meter is available for $10 or so. Although, if I can get good accuracy with a regular panel meter which costs $12, then so be it. Oops, I just found out that the panel meter is +-0.5% accuracy at full scale. So I may have answered my own question. Still....
Any advice? Thank you for your time.
Panel meter example.
**broken link removed**