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n Press
key
.
n The display will return to the meter mode and indicate up to 1.3000 amperes, depending upon the load.
Now raise the current by pressing
a specific increment (depending on the current resolution) each time you press the key and increases rapidly as you hold
down the key. To lower the current, press
Try to program a current greater than the IMAX for your supply. Note that the display shows OUT OF RANGE.
CV Mode vs. CC Mode
Once you program a voltage (V
depending on the resistance of the load (R
voltage maintained at V
. The output current will be at some value below Is as determined by V
s
For an Agilent 6552A supply, I
amperes at 20 volts, the supply will operate in the CV mode for all resistances >0.8 ohms. This represents the operating
resistance shown as R
= C in Figure 5-2. The supply will vary the output current to maintain a constant voltage of 25 volts.
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If the load resistance is <0.8 ohms, the supply will vary its output voltage to maintain a constant current output of 25
amperes. However, if you reprogram the output voltage to a lower value Vs (see Figure 5-2), then the supply will again be
able to maintain CV operation with the lesser load resistance, such as R
Programming Overvoltage Protection
Overvoltage protection guards the load against voltages that reach a specified value above the programmed output voltage.
Setting the OVP Level
Assuming that a power supply is programmed for 10 volts, you can set the OVP level to 11.5 volts as follows:
. The display will change from meter mode to indicate 0V, followed by the present OVP value.
n Press
n Press
n The display will return to the meter mode and indicate the output (10.000 volts).
again. The display will now indicate 0V 11. 500.
n Press
n Press
to return to the meter mode.
Checking OVP Operation
Assuming the above operating conditions, trip the OVP circuit as follows:
•
Raise the output voltage close to the trip point, such as 11.0.
•
Gradually increase the output voltage by pressing
voltage to drop to zero and the Prot annunciator to go on.
•
There now is no power supply output due to an overvoltage condition.
•
To verify this, press
58
Front Panel Operation
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. If you discover a mistake before pressing
(or rotating the Current control clockwise). Note that the current increases by
rotate the Current control counterclockwise.
) and a current (I
), the power supply will try to maintain itself in either CV or CC mode,
s
s
). If the load demands less current than I
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= 25.594 amperes and V
MAX
.
and observe that the display indicates 0V.
, erase the incorrect value with the backspace
, operation will be in CV mode with the
s
= 20.475 volts. If you program the output for <≤25
MAX
=B in Figure 5-2.
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until the OVP circuit trips. This will cause the output
÷ R
s
L.
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