Tutorial 6
Output Characteristics
E3632A User’s Guide 153
The ideal constant current power supply exhibits an infinite
output impedance at all frequencies. Thus as
Figure 6- 4
indicates, the ideal constant current power supply would
accommodate a load resistance change by altering its output
voltage by just the amount necessary to maintain its output
current at a constant value.
The output of the E3632A power supply can operate in
either constant- voltage (CV) mode or constant current (CC)
mode. Under certain fault conditions, the power supply can
not operate in either CV or CC mode and becomes
unregulated.
Figure 6- 5 shows the operating modes of the output of the
Keysight E3632A power supply. The operating point of one
supply will be either above or below the line R
L
= R
C
. This
line represents a load where the output voltage and the
output current are equal to the voltage and current setting.
When the load R
L
is greater than R
C
, the output voltage will
dominate since the current will be less then the current
setting. The power supply is said to be in constant voltage
mode. The load at point 1 has a relatively high resistance
value (compared to R
C
), the output voltage is at the voltage
setting, and the output current is less than the current
setting. In this case the power supply is in the constant
voltage mode and the current setting acts as a current limit.
Figure 6-5 Output characteristics
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