Parameter overview
Power parameters
Because the power output limit is 90 W, and
W = V × A, the maximum current of 500 mA
can be delivered only if voltage is ≤180 V.
Conversely, the maximum voltage of 300 V can
be delivered only if the current is ≤300 mA.
Programmed limits
Variable Range Increment
Voltage 10 – 300 V 1 volt
Current 4 – 500 mA 1 milliamp
Time 0 – 999 minutes 1 minute
Timer = 0 = continuous run
Timer = 1 – 999 = timed run in minutes
Power supply output limits
The PS300B can be programmed to limit voltage
(V) or current (mA). The power supply will
operate at the set limits provided the “load,” or
power requirement, does not exceed the power
supply rating.
“Crossover” occurs when the second parameter
limit is reached as system resistance changes
(Fig 3). At this point, the second parameter
becomes constant, and the previously unchang-
ing param eter adjusts downward as system
resistance changes. (System resistance is affected
by discontinuous buffers, changes in tempera-
ture, and buffer depletion.) When the power
supply is delivering power, the light above the
CONSTANT button indicates which parameter
is being held constant.
•
p5
Please note the following power
output limitations:
• The maximum power supply
output is 90 W, so the maxi-
mum current of 500 mA is
available at 180 V or less.
• At the maximum voltage
setting of 300 V, the current
is limited to 300 mA.
Note: In most cases, only one
parameter can be held constant
at a time.
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