PASCO PI-9880 User Manual
®
Instruction Manual
012-12695A
*012-12595*
DC Programmable Power Supply
PI-9880
®
DC Programmable Power Supply 012-12695A
2
®
Model No. PI-9880 012-12695A
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DC Power Supply Table of Contents
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Typical Uses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Tutorial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Standard Functions (Rectangle, Ramp, and Stair) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Custom Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
DC Programmable Power Supply
®
PI-9880
Included Equipment Part Number
DC Programmable Power Supply PI-9880
AC Power Adapter (100 - 240 VAC, 24 VDC) 540-102
Introduction
The PI-9880 DC Programmabl e Power Supply sources 0–18 volts (V) at up to 1 ampere (A). You can use the
Power Supply as a simple constant-voltage source, or take advantage of its advanced features to output periodic
functions and custom programs.
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DC Programmable Power Supply 012-12695A Typical Uses
Typical Uses
The Programmable Power Supply works well with a variety of electronic circuits,
motors, lamps, heaters, and Peltier devices, and the PASCO apparatus listed below.
Model Number Name Comments
ET-8499 Calorimeter Set the Power Supply’s Stair function for a single heat pulse (see
EM-8678 Charge/Discharge Circuit Use the Power Supply to charge the circuit’s capacitor or battery. Set the
ET-8782 Thermoelectric Circuit Set the Power Supply’s maximum voltage to 10 V (see page 20).
ME-8088 Centripetal Force
Apparatus
ME-8750 Mechanical Oscillator
Driver
ME-8955 Rotational Motor Drive Drive the Rotating Platform (ME-8951) with the Magnetic Levitation
TD-8513 Heat Conduction Apparatus Power the apparatus with a positive-offset rectangle wave (see page 22)
page 26).
Power Supply’s maximum voltage to 5 V (see page 20).
Use the Power Supply’s ramp function (see page 23) to slowly increase
the rotational speed.
Drive dynamics carts (such as ME-6950) or the Chaos/Driven Harmonic
Accessory (CI-6689A).
Accessory (EM-8947) or Rotational Acceleration Tank (ME-8957).
or sine wave (the Power Supply’s default custom program, see page 28).
Specifications
General Specifications
Output Voltage Adjustment 0–18 V
Voltage Adjust Resolution 10 mV
Voltage Adjust Accuracy 0.25% of setting or 20 mV, whichever is larger
Current-limit Shutdown Programmable, 0.010–1.050 A
Current Measurement Accuracy 3%
Load Regulation 1%
Output Noise 20 mV peak-to-peak typical, 60 mV peak-to-peak at full load
Function-specific Specifications
Function 1: Constant DC Output
(see page 19)
Function 2: Rectangle Wave
(see page 22)
Function 3: Ramp
(see page 23)
Monitor voltage or current, or cycle with adjustable time
Programmable maximum voltage
Programmable minimum voltage
Programmable period: 0.1–999 s
Programmable duty cycle: 1–99%, Jitter: ±300 μs
Monitor voltage or current
Programmable maximum voltage
Programmable minimum voltage
Programmable period: 0.1–999 s
Programmable ramp direction (ascending or descending)
Alternating ramp direction option (triangle wave)
Programmable number of cycles: 1 to 999, or infinite
Monitor voltage or current
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Model No. PI-9880 Specifications
Function 4: Stair
(see page 25)
Function 5: SET MAX
(see page 20)
Function 6: PROGRAM
Custom program entry
(see page 28)
Function 7: PLAY
Custom program output
(see page 29)
Programmable maximum voltage
Programmable step voltage: 0.01–18.00 V
Programmable minimum voltage
Programmable step time: 0.1–999 s
Programmable stair direction (ascending or descending)
Alternating stair direction option
Programmable number of cycles: 1 to 999, or infinite
Monitor voltage or current
Programmable voltage limit: 0.01–18.00 V
Programmable maximum current: 0.010–1.050 A
Automatic shutdown timer: 0.01–99.99 hours
“Hidden” Global Maximum voltage: 0.01–18.00 V (remembered after power off)
3–99 programmable voltage points (remembered after power off)
Edit modes: append, insert, delete point, delete entire program
Programmable scale factor: 1–100% of programmed voltage
Programmable step-time: 0.1–999 s
Step-style and vector-style options
Programmable play direction (forward or backward)
Alternating play direction option
Programmable number of cycles: 1 to 999, or infinite
Monitor voltage or current
Combining Two Units Two or more Programmable Power Supplies can be connected in series. Connect the negative terminal of one unit to the positiv e termin al of
the other .
Excessive voltage levels can be achieved when combining units in this way; students
should do so only under the supervision of a qualified instructor.
Storage For easy storage of multiple units, indentations in the Programmable
Power Supply accept the feet of an identical unit stacked on top of it.
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DC Programmable Power Supply 012-12695A Specifications
Power
Supply
+
-
100 mF
100 W
100 mF
100 W
Power
Supply
+
-
20 W
Experiment-design Considerations Please note the following properties of
the Programmable Power Supply when planning an application:
• The Power Supply is over-current protected, but it is not current-limited or
current-regulated. If the maximum output current (1 amp by default, or lower if
you have changed the maximum-current setting) is exceeded, the Power Supply
will need to be manually reset before operation can resume. See “Over-current”
on page 20.
• The output voltage range is 0 to 18 V. To achieve a negative voltage switch the
positive and negative leads.
• This device is a programmable power source, not a function generator. The maximum frequency of the rectangle and ramp functions is 10 Hz. The maximum frequency of the default sine-wave custom program is about 0.1 Hz.
• The Power Supply is designed for current flow in one direction: out of the positive terminal and into the negative terminal. In the example illustrated below, the
Power Supply is switched from 0 V to 5 V, then back to 0V. The capacitor does
not discharge in a predictable way because there is not a simple path to ground.
To provide a path to ground, connect a resistor across the Power Supply’s
terminals as shown.
A current-sinking resistor is not typically required when driving motors, lamps
and heating resistors since these devices have a low DC resistance.
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Tutorial
This tutorial will introduce you to the DC Programmable Power Supply. As you follow the steps, it will
be helpful to measure and view the Power Supply’s voltage output. Here are three possible ways to do
that:
1. Use a data-acquisition program such as DataStudio with a voltage s ensor. The sample waveforms
shown in the tutorial were collected in this manner.
2. Use an digital storage oscilloscope capable of displaying several second ’s worth of data.
3. Use a normal volt meter. This option will not allow you to reproduce the graphs on the following
pages, but you will be able to observe the variation of the Power Supply’s output.
If possible, connect a load resistor (o r other device such as a small light bulb) to the output so that you
can look at the current draw. You can use any resistor from about 20 Ω to 100 Ω, but check the power
rating to make sure it will not overheat; during the tutorial, you will apply vol tages up to 10 volts.
Set-up
1. Plug the AC adapter into a wall outlet and
into the port labeled POWER on the Power
Supply.
2. Use a pair of banana-plug patch cords to
connect a load resistor (or other device) to
the Power Supply’s red (+) and black (−)
OUTPUT ports.
3. Connect a voltage sensor, meter, or oscilloscope to the OUTPUT ports.
4. Notice the two buttons: and . You will
use these buttons, along with the knobs, to
control the Power Supply’s output and display.
5. Push and hold both buttons. While holding
the buttons, turn on the power switch (if it is
already on, turn it off and on again). Continue to hold both buttons until the display
shows LLLL, then release the buttons. The
original factory settings have been loaded.
POWER and OUTPUT connections
Buttons
Load factory settings
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DC Programmable Power Supply
SET
MAX
PLAY
PROGRAM
FUNCTION
Constant
DC
Rectangle
Wave
Ramp
Stair
Set Maximum
Values
Enter
or Edit
Custom
Program
Play
Custom
Program
Voltage
LED blinks
rapidly.
Function 1: DC Voltage
1. Turn the Function knob to the Constant DC
position ( ). The display briefly shows F1
(for “Function 1”), then 0.00 (for zero vo lts).
The Voltage LED is lit, indicating that the
quantity displayed is voltage in units of
volts.
2. Turn the Coarse knob to set the voltage to
4.00 V. Note that the displayed voltage
reflects the actual voltage at the output terminals.
Turn the Fine knob. If you rotate it slowly,
the voltage changes by 0.01 V per detent. If
you rotate the knob more quickly, it changes
by 0.04 V per detent. Adjust the voltage back
to 4.00 V.
Tutorial
The Function knob
3. Quickly press and release to temporarily
switch off the output. The Voltage LED
blinks rapidly, and the actual output voltage
drops to zero, though the display still shows
the voltage setting.
Turn the Coarse knob. Note that you can
adjust the voltage setting while the actual
output remains zero. Return the voltage setting to 4.00 V
Press to switch the output back on. The
Voltage LED is now on steadily to indicate
that the output voltage is live.
Set voltage
Quickly
press and
release.
Temporarily switch off output
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®
Model No. PI-9880 012-126955A
Quickly
press and
release.
Press
and
hold.
The TIME
LED starts
blinking.
Press
and hold.
4. Quickly press and release . The Current
LED lights, and the display now shows output current in amps. Press a few times to
toggle the display between current and voltage.
While viewing current on the display, turn
the Coarse and Fine knobs. You are actually
adjusting the voltage, but you see the resulting current change on the display.
5. Press and hold until the Time LED starts
blinking, and the displa y shows 0; while
holding the button, turn the Coarse knob to
change the display to 2. Release the button.
The display now automatically toggles
between current and voltage every 2 seconds.
Tutorial
Change display
Press to pause the display toggling; press
again to resume.
6. Press and hold until the display shows
0.00. Release the button. You have just reset
the output voltage to zero and the display to
voltage.
For more information about constant DC output, see
page 19.
Function 5: SET MAX
1. Turn the Function knob to SET MAX. The
display briefly shows F5 (for “Function 5”)
followed by 18.00, which is the Power Supply’s voltage-limit setting. (Note that the
actual output voltage is zero.)
Turn the Coarse knob to set the voltage limit
to 10 V.
Set display-toggle time
Reset output and display
Turn the Function knob back to Constant DC
mode ( ). Try to adjust the output voltage
to over 10 volts.
2. Turn the Function knob back to SET MAX.
Press once to display the maximumcurrent setting. Turn the Coarse and Fine
knobs to adjust the maximum current to
0.210 A.
Set maximum voltage
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DC Programmable Power Supply
Press so
the TIME
LED starts
blinking.
Press
and
hold both
buttons.
Turn the Function knob back to Constant DC
( ). Increase the voltage until the Current
LED blinks amber and the display shows
OL (for “overload”) to indicate that the maximum current has been exceeded and th e o utput has automatically turned off (this will
happen only if you h ave a load hoo ked t o the
power supply). Press to return the Power
Supply to normal operation.
Turn the Function knob back to SET MAX.
Press once to display the maximum current setting. Adjust it back to 1.05 A.
3. Press so that the Time LED starts blink-
ing and the display shows 0.00; this is the
countdown time in hours. Turn the Fine
knob to set the time for 0.01 hour (36 seconds). Note that the Time LED is blinking to
indicate that the countdown has not started
yet.
Tutorial
Display shows current Over Load
Press to start the countdown. The Time
LED is now lit steadily. Turn the Function
knob back to Constant DC ( ) and set the
voltage to 1 V. Wait for the remainder of the
36 seconds. When the countdown time has
elapsed, the display shows OFF to indicate
that the output has been switched off. Press
to return the Power Supply to normal
operation.
4. Turn the Function knob back to SET MAX.
Push and hold both buttons until the Voltage
LED starts blinking fast and the display
shows 18.00 (this is the Global Maximum
voltage setting); while holding both buttons,
turn the Coarse knob to change the Global
Maximum to 14.00 V. Release both buttons.
You have just set the Power Supply so that
the output voltage, the voltage-limit setting,
and any other voltage setting cannot exceed
14 V.
Set countdown time in hours
Display shows auto off
Setting “Hidden” Global Maximum voltage
5. Repeat the previous step to turn the Global
Maximum ba ck to 18 V.
For more information about setting maximum values,
see page 20.
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