Agilent Technologies 34420A Especificações descarregar pdf (Página 260)

In the power-on state of the meter, offset compensation is enabled. In

some circumstances it may be desirable to turn offset compensation off.

For example if the resistor being measured does not respond quickly to

changes in current, offset compensation will not produce an accurate

measurement. Resistors with very large inductances or resistors with

large values of parallel capacitance would fall into this category. In these

cases the DELAY parameter can be increased to allow more settling time

after the current source is switched on or off, or the offset compensation

function can be turned off.

Power Dissipation Effects

When measuring resistors designed for temperature measurements (or

other resistive devices with large temperature coefficients), be aware that

the meter will dissipate some power in the device-under-test. The effects

of this power dissipation can affect the measurement accuracy.

If power dissipation is a problem, there are two actions you can take: you

can select a higher measurement range to reduce the errors to acceptable

levels or you can set the meter to the low power mode to limit the test

current (see page 69). The following table shows several examples.

Normal Low Power

Range Test Current

DUT Power

(at Full Scale)

Test Current

DUT Power

(at Full Scale)

1 Ω

10 mA 100 W 10 mA 100 W

10 Ω

10 mA 1 mW 10 mA 1 mW

100 Ω

10 mA 10 mW 1 mA

100 W

1 k Ω

1 mA 1 mW

100 A 10 W

10 k Ω

100 A 100 W 10 A1 W

100 k Ω

10 A 10 W5 A2.5 W

1 M Ω

5 A 25 W5 A 25 W

Chapter 7 Measurement Tutorial

Measurement Techniques and Sources of Error

260

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