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Model No. PI-9877
Standard Functions (Rectangle, Ramp, and Stair)
25
Stair
Stair Parameters
The Stair function has five parameters: Maxi-
mum Voltage, Step Voltage, Minimum Voltage,
Step Time, and Auto-repeat.
The Auto-repeat parameter determines the
total number of cycles that are output before
the function stops. For indefinite repetition, set
Auto-repeat to zero.
The
signs
of the Step Time and Auto-repeat parameters (
+
or
−
) determine the shape
of the wave. Step Time is positive for an ascending stair or negative for a descending
stair. Auto-repeat is positive for a stair that goes in one direction (either up or down)
before repeating or negative for stairs that alternate directions.
Some examples of parameter combinations and their resulting waveforms are illus-
trated below.
Stair Set-up
1.
The
Maximum Voltage
parameter of the Stair function is always equal to the
Power Supply’s voltage-limit setting. Turn the Function knob to SET MAX; then
turn the Coarse and Fine knobs to adjust the voltage limit.
2.
Turn the Function knob to . The display shows the
Step Voltage
parameter.
The Voltage LED blinks slowly to show that the Power Supply is in set-up mode
with no output. Turn the Coarse and Fine knobs to set the Step Voltage.
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Max.
Voltage
Step
Voltage
Min.
Voltage
Step
Time
Auto-
repeat
Waveform
Comments
18
5
0
1.0
1
The sign of Step Time
determines whether the
stair is ascending (
+
) or
descending (
−
).
18
5
0
−
1.0
1
13
5
0
1.0
2
The sign of Auto-repeat
determines whether the
stair goes in one direction
or alternates directions.
When alternating, the top
and bottom steps do not
repeat.
13
5
0
1.0
−
2
13
2
0
1.0
1
The top of the stairs is
determined by (but not
necessarily equal to) the
Maximum Voltage
parameter.
11
2
0
2.0
1
Stair Defaults:
Max. Voltage
18 V
Step Voltage
1 V
Min. Voltage
0 V
Step Time
2 s
Auto-repeat
0
Summary of Contents for PI-9877
Page 1: ... DC Power Supply PI 9877 Instruction Manual 012 09125A ...
Page 18: ... DC Power Supply 18 T u t o r i a l ...
Page 36: ......