34410A/11A User’s Guide
103
Measurement Tutorial
4
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 lead resistance.
2
Press
. 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.
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
9
W
) when compared to PTFE (Teflon) insulators
(10
13
W
). Leakage from nylon or PVC insulators can easily contribute a
0.1% error when measuring a 1 M
W
resistance in humid conditions.
Range
Test Current
DUT
Power at Full Scale
100
W
1 mA
100
m
W
1 k
W
1 mA
1
m
W
10 k
W
100
m
A
100
m
W
100 k
W
10
m
A
10
m
W
1 M
W
5
m
A
25
m
W
10 M
W
500 nA
2.5
m
W
Summary of Contents for 34410A
Page 1: ...Agilent Technologies Agilent 34410A 11A 6 Digit Multimeter User s Guide...
Page 6: ...6 34410A 11A User s Guide...
Page 12: ...12 34410A 11A User s Guide...
Page 34: ...34 34410A 11A User s Guide 1 Quick Start...
Page 96: ...96 34410A 11A User s Guide 3 Remote Interface Configuration...
Page 106: ...106 34410A 11A User s Guide 4 Measurement Tutorial...
Page 120: ...120 34410A 11A User s Guide 4 Measurement Tutorial...
Page 140: ...140 34410A 11A User s Guide 5 Specifications...
