I use a Fluke 8K40, which is a 1000x probe designed for use with a 10M+/-10% DVM. It has a 1G input R and works up to 40kV. The internal resistors have a voltage coefficient (of course) which introduces an error. It is set for nominal 1000x at 25kV with 1% error with a 10M DVM, which means that at lower and higher voltage the errors become 4% at 1kV and 40kV. And it really is a DC probe, and has an error of +/-5% at 60Hz.
They say that if the DVM has much greater than 10M input R, add a shunt, and if much less apply a calculated correction factor.
Basically it is 1G between the tip and the DVM positive and a 1.11M to DVM negative. So a 10M input R DVM shunts the 1.11M to give 1M and hence the 1000x attenuation. And that shunting action means that a 10% error in DVM R translates to 1% error in attenuation.
They can be picked up on eBay from time to time for quite reasonable sums.
It is one of Fluke's longest living products, introduced in the late '70's and is still a current product.
They say that if the DVM has much greater than 10M input R, add a shunt, and if much less apply a calculated correction factor.
Basically it is 1G between the tip and the DVM positive and a 1.11M to DVM negative. So a 10M input R DVM shunts the 1.11M to give 1M and hence the 1000x attenuation. And that shunting action means that a 10% error in DVM R translates to 1% error in attenuation.
They can be picked up on eBay from time to time for quite reasonable sums.
It is one of Fluke's longest living products, introduced in the late '70's and is still a current product.
