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34410A/11A User’s Guide
4
Measurement Tutorial
Other Sources of Measurement Error
Settling Time Effects
The multimeter has the ability to insert automatic measurement settling
delays. These delays are adequate for resistance measurements with less
than 200 pF of combined cable and device capacitance. This is particularly
important if you are measuring resistances above 100 k
W
. Settling due to
RC time constant effects can be quite long. Some precision resistors and
multi–function calibrators use large parallel capacitors (1000 pF to 0.1
m
F)
with high resistor values to filter out noise currents injected by their
internal circuitry. Non–ideal capacitances in cables and other devices may
have much longer settling times than expected just by RC time constants
due to dielectric absorption (soak) effects. Errors will be measured when
settling after the initial connection and after a range change.
Loading Errors (ac volts)
In the ac voltage function, the input of the multimeter appears as a 1 M
W
resistance in parallel with 100 pF of capacitance. The cabling that you use
to connect signals to the multimeter will also add additional capacitance
and loading. The table below shows the multimeter's approximate input
resistance at various frequencies.
For low frequencies, the loading error is:
At high frequencies, the additional loading error is:
Input Frequency Input Resistance
100 Hz
1 M
Ω
1 kHz
850 k
Ω
10 kHz
160 k
Ω
100 kHz
16 k
Ω
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...
