3-4
DC Current Source Operation
Model 6220/6221 User’s Manual
Return to
When operating as a sink, the Model 622x is dissipating power rather than sourc-
ing it. The polarity of the current and voltage seen at the output is opposite (one
positive, one negative). An external source or an energy storage device, such as
a capacitor, can force operation into the sink region.
shows examples of the Model 622x connected to an external source
where it can operate as a source or sink. For both examples, the Model 622x is
programmed to 10mA. When connected to the 1k
Ω
resistor and 10V
source as shown in
A, the Model 622x operates as a 200mW source
supplying power to the external test circuit. When the external voltage is
decreased to -30V as shown in
B, the Model 622x instead operates as
a sink. The Model 622x dissipates 200mW of power (10mA x -20V = -200mW).
Figure 3-1
Source and sink examples
Operating boundaries
shows the four quadrants of operation for the Model 622x. When oper-
ating in the first (I) or third (III) quadrant, the Model 622x is operating as a source.
A shows an example of quadrant I operation (current and voltage both
positive).
When operating in the second (II) or fourth (IV) quadrant, the Model 622x is oper-
ating as a sink.
B shows an example of quadrant IV operation (current
positive and voltage negative).
1k
W
20V
622x
+10mA
A) Source operation
1k
W
-20V
-30V
622x
+10mA
B) Sink operation
10mA
10mA
10V
Hi
Lo
Hi
Lo
10V
10V
Summary of Contents for 6220 DC
Page 2: ......
Page 4: ......
Page 6: ......
Page 16: ......
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...
Page 167: ......
Page 169: ......
Page 170: ......