Removing Test Lead Resistance Errors; Minimizing Power Dissipation Effects; Errors In High Resistance Measurements - Agilent Technologies L34410A User Manual

Removing Test Lead Resistance Errors

To eliminate offset errors associated with the test lead resistance in 2–wire
ohms measurements, follow the steps below.
1 Short the ends of the test leads together. The multimeter displays the test
2 Press
See also

Minimizing Power Dissipation Effects

When measuring resistors designed for temperature measurements (or other
resistive devices with large temperature coefficients), be aware that the
multimeter will dissipate some power in the device–under–test.
If power dissipation is a problem, you should select the multimeter's next
higher measurement range to reduce the errors to acceptable levels. The
following table shows several examples.

Errors in High Resistance Measurements

When you are measuring large resistances, significant errors can occur due to
insulation resistance and surface cleanliness. You should take the necessary
precautions to maintain a "clean" high–resistance system. Test leads and
fixtures are susceptible to leakage due to moisture absorption in insulating
materials and "dirty" surface films. Nylon and PVC are relatively poor
insulators (10
Leakage from nylon or PVC insulators can easily contribute a 0.1%
error when measuring a 1 MΩ resistance in humid conditions.
34410A/11A/L4411A User's Guide
lead resistance.
. The multimeter will store the test lead resistance as the 2–wire
ohms null value, and enable that value to be subtracted from subsequent
measurements.
"Null Measurements"
Range
100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
9
Ω) when compared to PTFE insulators (10
on page 59.
Test Current
Power at Full Scale
1 mA 100
1 mA 1 mW
μ
100 A 100
μ
10 A 10
μ
5 A 25
500 nA 2.5
Measurement Tutorial
DUT
μ
W
μ
W
μ
W
μ
W
μ
W
13
Ω).
4
105