Figure 2-8 Source Current Operation - Keysight U2722A User Manual

2 Operation and Features
Input Protection Voltage line
15 V
Load line with R = 500 Ω
10 V
V
meter
V
meter
(A) Normal source current mode operation
Figure 2-8
In
500 Ω load and it is measuring 10 V. As long as the DUT load line intersects the
source current line, it will be in source current mode and the current will maintain
at 20 mA. However in
increases to 1 kΩ, the DUT load line intersects the input protection voltage line.
This forces the U2722A/U2723A to go into source voltage mode. Since the
voltage setting is clamped at 15 V and the U2722A/U2723A cannot operate out of
the boundary, the current then changes to 15 mA instead.
42
Source Current
line
I
20 mA
source
= I × R
source
= 20 mA × 500 Ω
= 10 V
Source current operation
Figure 2-8 (A), the U2722A/U2723A is having a source current of 20 mA to a
Figure 2-8
Input Protection Voltage line
15 V
Load line with
R = 1 k Ω
V
meter
I
I
(B) Crossover to source current mode operation
(B), it shows that when the resistance of the DUT
Keysight U2722A/U2723A User's Guide
Source Current line
15 mA
source
= V / R
meter
source
= 15 V / 1 kΩ
= 15 mA
20 mA