Terminal Voltage And Source Output Value - Agilent Technologies B1542A User Manual

Performing Measurement
Theory of Measurement
The test system repeats this drain current measurement for all of the specified sweep
voltage and gets the data to plot on the data display graph.
Figure 4-2 Simplified Measurement Circuit
VgMon, VdInt, and Id values will be the value obtained at the specific timing of the
pulse peak. It is the data extraction timing shown in Figure 5-9.

Terminal Voltage and Source Output Value

In Figure 4-2, VgMon and VdInt are the device terminal voltage. Vpgu-out and
VdSet are the source output values. Moreover the values are not same because of the
several elements in the measurement path, shunt resistor, residual resistor, and so on.
Therefore, it is required to select which value should be the target voltage before
performing the measurement. To select it, use the drain voltage automatic
adjustment function and the gate voltage automatic adjustment function in the
pulsed IV test definitions.
If the drain voltage automatic adjustment function is ON, VdInt will be close to the
target voltage Vd. And if the function is OFF, VdSet will be close to Vd.
If the gate voltage automatic adjustment function is ON, VgMon will be close to the
target voltage Vg. And if the function is OFF, Vpgu-out will be close to Vg.
The target voltage Vd is calculated from the Test Parameters VdStart, VdStop, and
VdStep in the pulsed IV test definition. And Vg is calculated from VgStart, VgStop,
and VgStep.
Agilent B1542A User's Guide, Edition 4 4- 5