Pulse Delta 3-Point Measurement Technique; Pulse Delta Process - Keithley 2182 User Manual

Pulse Delta process

Pulse Delta measurements
For Pulse Delta, the Model 6221 outputs current pulses. Current pulses that have a short
pulse width are ideal to test a low-power DUT that is heat sensitive.
By default, Pulse Delta uses a 3-point repeating-average algorithm to calculate readings.
Each Pulse Delta reading is calculated using A/D measurements for a low pulse, a high
pulse, and another low pulse. The Model 6221 outputs the pulses and the Model 2182A
performs the A/D measurements. As shown in
Pulse Delta voltage reading.
Figure I-4

Pulse Delta 3-point measurement technique

1st Pulse Delta Reading
2nd Pulse Delta Reading
In cases where the high pulse will cause heating of the DUT, the measurement at the sec-
ond low pulse could be adversely affected by the heat caused by the high pulse. In that
case, the measurement at the second low pulse can be disabled. This does not change the
overall timing of the pulse output. Eliminating the second low pulse measurement changes
the basic calculation to the following:
Pulse Delta = (2Y – 2X) / 2
Where:
Delta, Pulse Delta, and Differential Conductance
Pulse Delta
Reading
1st
Y is the measurement at the high pulse.
X is the measurement at the first low pulse.
Figure I-4, every three pulses yields a single
Pulse Delta
Reading
2nd
Nth Pulse Delta Reading
I-9
Pulse Delta
Reading
Nth