HIGH VOLTAGE

I recently got a new multimeter that has a slightly higher burden than the meter I was previously using. This meant that the original voltage divider I made wouldn't calibrate to my new meter. The solution was to increase the resistance of R2 in the divider. On the v1 divider R2 was made up of a 1MΩ and a 100KΩ trimmer pot in series. To increase the R2 in the v2 divider I added a couple of 100KΩ resistors in series with the 100KΩ trimmer pot. R2 became 1MΩ + 100KΩ + 100KΩ + 100KΩ (pot) all in series. I added two jumpers alongside the two new 100KΩ resistors so I can put them in circuit or

Some time ago I threw together (what I thought was) a 1000:1 voltage divider for measuring the HV on Geiger counters. This consisted of a Dale 1% 1G ohm resistor (R1) mounted all nice in a box with big chunky gold banana connectors and another quality 1% 1M ohm resistor (R2) connected to a banana socket and then a bunch of croc leads flying about. It worked, but wasn't right. I hadn't accounted for the multimeter's own internal resistance (known as a burden on a circuit). I'm pretty sure my multimeter is a 20M ohm resistance, or thereabouts, so that made R2 actually 950K ohm when the meter