aluminum tape again
Auto brake light
Back hoe log splitter
Black tape and PVC cement
Broken gas can cap
C-band dish solar furnace
Making a Cheap battery State Of Charge gauge more accurate
Cleaning the corroded buss bars from a Prius battery pack
Fixing small plastic gears
Forever solar desk lamp
How I splice audio cables
IMA motor coil shift in collision
Insight Battery pack turbo cooler
Insight Oil Pan second chance
Lifting the battery safely
making a ducted blower from a computer fan
Making an isolated hall effect current sensor with ring terminals
making a heavy workbench mobile
Making a simple IMA bypass connector from an old pack relay board
Making some custom solar panels
Measuring resistance of less than 1 ohm
Motorizing a snow blower chute
Put your exercize to good use?
Quick way to make a connector for checking the subpacks
Reading the blink codes
Real time external MPG display
Rear view Video cameras
Solar headlight
Soldering iorn degausser
Some uses of laser pointers
Taking Video of the dash
Those useful Prius subpacks
Using digital caliper to measure hole center to center distance
weed whacker motor converted to bicycle motor
When cleaning the EGR does not fix the hesatation
Where do you find high quality alligator clips?
Handy use for Aluminum tape.

Measuring resistance of less than 1 ohm

Measuring resistance of less than 1 ohm
measuring less than 1 ohm accurately

Having some issues with the resistance of a db-25 cable, and need to compare the end to end resistance of several brands to find the lowest resistance.
Unfortunately when using most DVM's, the sub ohm accuracy and resolution is pretty poor.
Special sub ohm testers usually use a 4 connection meter. two leads apply a constant current, and two pick up the developed voltage.
I used my adjustable constant current lab supply, set to produce 1A CC.
This current through the sub ohm cable wires will develop 1V/ohm, so the cables actual resistance can be measured with 0.001ohm accuracy. The voltmeter will read 220mV for the 0.220 ohms.
Since the current is constant, and the current connections are separate from the measuring connections, the accuracy is very good.