Transcript Document

Photo #1: The EE 188 Lab Power Supply
Displays Voltage
Displays Current
The CV light indicates that
the supply is maintaining a
Constant Voltage
Adjusts Voltage
Output voltage is available at
these terminals; the + is at a
higher voltage than the 1 of 7
Photo #2: What is this terminal?
This terminal connects to the power supply case and to the power line safety ground.
In most cases it is not used. The internal voltage source connected to the + and –
terminals is isolated from the ground terminal (sometimes referred to as “floating”).
This allows connection of the voltage source to a circuit independently of how the
circuit might be connected to ground.
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Photo #3
Adjusts Current Limit
(With the terminals shorted, turn the
current adjust knob clockwise to
increase the current limit)
Note that
the output
voltage
drops as
needed to
limit the
current
The CC light indicates the supply
is providing Constant Current
Safety Note: This power supply has built-in protection for a short circuit;
a battery, on the other hand, might start a fire or explode if shorted.
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Photo #4
The current limit value is set using the
current adjust knob when shorted
You can also set or display the current limit
by holding in the DISPLAY/OVP/CC Set
button rather than shorting the output
terminals with a wire
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Photo #5
One lamp connected to the power supply
Arrows show direction of current flow
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Photo #6
Two lamps connected in parallel
Note that there are 2 independent “parallel” current paths
Arrows show
direction of current
flow
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Photo #7
Two lamps connected in series
Note that there is only 1 shared “series” current path
Arrows show direction of current flow
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