I've been trying different coatings for my ESL's but have had no good way off knowing the "exact" surface resistance.
I have used the method with two coins and a multimeter and I also have a small testpanel to try how the coating works under real conditions.
The time has now come to make a more correct measuring device.
I hopefully will have the opportunity to buy an old Gigameter soon, but until it's on the work bench I would like to build my own DIY-version!
This is what I'm thinking:
1. Probe.
80x80mm Plexiglas with 80x17mm Copper strips 5mm thick.
Gives 1:1.78 W/L
2. DC PSU.
500 or 1000V low current PSU, LM317->NE555->IRF840->diod multipliers.
3. Multimeter. Known internal resistance 10M Ohm
Connect everything in series and measure the voltage over the multimeter.
Will this work, or is there a better/easier way to do it?
/R
I have used the method with two coins and a multimeter and I also have a small testpanel to try how the coating works under real conditions.
The time has now come to make a more correct measuring device.
I hopefully will have the opportunity to buy an old Gigameter soon, but until it's on the work bench I would like to build my own DIY-version!
This is what I'm thinking:
1. Probe.


80x80mm Plexiglas with 80x17mm Copper strips 5mm thick.
Gives 1:1.78 W/L
2. DC PSU.
500 or 1000V low current PSU, LM317->NE555->IRF840->diod multipliers.
3. Multimeter. Known internal resistance 10M Ohm
Connect everything in series and measure the voltage over the multimeter.
Will this work, or is there a better/easier way to do it?
/R
Per suggestions from this forum frequenters I used simple stencil with slot about 1cm wide + Graphite 33 spray. Draw two strips on coated mylar about 10 cm long and 1 cm apart. Then measure resistance using voltmeter with known input resistance as ampermeter. Metal foil strips did not yeild reliable contactsI've been trying different coatings for my ESL's but have had no good way off knowing the "exact" surface resistance.
I have used the method with two coins and a multimeter and I also have a small testpanel to try how the coating works under real conditions.
The time has now come to make a more correct measuring device.
I hopefully will have the opportunity to buy an old Gigameter soon, but until it's on the work bench I would like to build my own DIY-version!
This is what I'm thinking:
1. Probe.
80x80mm Plexiglas with 80x17mm Copper strips 5mm thick.
Gives 1:1.78 W/L
2. DC PSU.
500 or 1000V low current PSU, LM317->NE555->IRF840->diod multipliers.
3. Multimeter. Known internal resistance 10M Ohm
Connect everything in series and measure the voltage over the multimeter.
Will this work, or is there a better/easier way to do it?
/R
Alex
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