Model 6220/6221 User’s Manual
Delta, Pulse Delta, and Differential Conductance
5-21
Return to
Pulse Delta
Use the Keithley Model 2182A with the Model 6221 to run Pulse Delta.
Model 6221 measurement 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
, every three pulses yields a single Pulse Delta voltage reading.
Figure 5-7
Pulse Delta 3-point measurement technique
In cases where the high pulse will cause heating of the Device Under Test (DUT),
the measurement at the second 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. Elim-
inating the second low pulse measurement changes the basic calculation to the
following:
Pulse Delta = (2Y – 2X) / 2
Pulse Delta
Reading
1st
62xx
I-Source
2182A
A/D
C
I-High
I-Low
2B - A - C
(
1st Pulse Delta Reading
=
2
)
2E - D - F
(
2nd Pulse Delta Reading
=
2
)
2Y - X - Z
(
Nth Pulse Delta Reading
=
2
)
2182A
A/D
A
2182A
A/D
B
2182A
A/D
E
2182A
A/D
F
2182A
A/D
X
2182A
A/D
Y
2182A
A/D
Z
1st Pulse Delta
Interval
2nd Pulse Delta
Interval
Nth Pulse Delta
Interval
Pulse Delta
Reading
Nth
2182A
A/D
D
Pulse Delta
Reading
2nd
Where:
X, Y, and Z are the A/Ds for the first low, high, and
second low pulses for the Pulse Delta cycle.
High Low
Low
High
Low
Low
High
Low
Low
Summary of Contents for 6220 DC
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Page 36: ...1 20 Getting Started Model 6220 6221 User s Manual Return to Section 1 topics...
Page 131: ...6 10 Averaging Filter Math and Buffer Model 6220 6221 User s Manual Return to Section 6 topics...
Page 148: ...A Specifications...
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