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15 years ago I've designed some similar device. It was OP77 + common base amplifier, loaded by current source and emitter follower. By nowdays you can buy it from apex, for example. **broken link removed**
Kelvin connection - the rersistor has four terminals, two for the current path, two for the measurement circuit. By this you can eliminate voltage drop across the wires of the measurement circuit.
And the cost of such a resistor is not so high - 0.01Ohm, 1W, 5% SMD resitor costs $0.7
Hi!
I think the easiest way to do it is just to place a resistor in series with each lead, and to limit voltage by a diode limiter. To widen the common-mode range you need to limit the voltage to some volts. You also have to care about safety - first-fault has to be safe.
voltage rating pcb
For example, our matufacturer used a material "Epoxidharz Araldit F" from CIBA GEIGY. But I affraid it will be useless for you. During transition from development to manufacturing I just asked manufacturer for some suitable material.
Alex
pads library tqfp
Sergiu_Q, my experience shows, that the only way to get a "right" footprint is to draw it myself. Footprints are technology-dependant and it is useless to hope that somebody knows your requirements. I can say also, that to make a new footprint even with orcad will take less...
high voltage creepage distance calculator
I can't recommed a specific type for you - each manufacturer names it in a different way. Try to searh google for "epoxy resin" or "silicon rubber".
creepage internal layer
I overlooked their site - for sure, they use some sort of protective gluing, at least for smaller power supplies. Yes, it is allowed. The only concern is to proove, that the gluing has no air bubbles inside. After it you can use not surface voltage rating, but rating of...
lqfp cadence library
Does it really matter for you - orcad or pads? they have footprints, you can see all dimensions inside the calculator - it will take a few minutes to make a footprint inside your orcad with these data...
kv pcb distance
my rule is 3mm/kV. it worked up to 2.5kV(on the surface). Dielectric strength of FR4 is about 30-35kV/mm(between two sides). you can see properties of FR4 here: **broken link removed**
But, if you device is subject to regulation (60950, 60601 or whatever else) you have to use...
fault trigger on tek 465
from my point of view (mainly analog engineering):
1. it is very useful to have 4 channels.
2. Tek - piece of junk. yeah, ok, it's a good scope to observe what's happening with your clock signal over time, but 15bytes(or even less) of memory without possibility to...
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