Agilent Technologies B2201A Manual de Serviço descarregar pdf (Página 93)

Module 13

SPGU Control and Applications

13-7

Effects of Load Impedance

Setup: 1V output, 50 Ω load

Actual load: 1 MΩ Æ 2 V output

Expected

Actual

Setup: 1 V output, 1 MΩ load

Actual load: 50 Ω Æ 0.5 V output

Expected

Actual

High Voltage SPGU

Mismatch of load impedance

setting may cause the error of

applied voltage to the DUT.

Here is the example of the voltage error due to the mismatch of the load impedance setting.

If the load impedance is set to 50 ohm when the actual load impedance is 1 Mohm, the voltage actually applied

to the DUT is about double the setting value. If the load impedance is set to 1 Mohm when the actual load

impedance is 50 ohm, the voltage actually applied to the DUT is about half the setting value. So the load

impedance value must be accurate to apply the voltage near the setting value to the DUT.

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Agilent Technologies B2201A Manual de Serviço Página 93