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PASCO PI-9877 Instruction Manual

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I n s tr u c ti o n M a nu a l
®
012- 09125A
DC Power Supply
PI-9877

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Summary of Contents for PASCO PI-9877

  • Page 1 I n s tr u c ti o n M a nu a l ® 012- 09125A DC Power Supply PI-9877...

  • Page 2: Table Of Contents

    DC P o we r S u p pl y Ta bl e o f Co nt en t s Contents Introduction ............3 Typical Uses .

  • Page 3: Introduction

    540-062 Introduction The PI-9877 DC Power Supply sources 0–18 volts at up to 1 amp. 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 pro- grams.

  • Page 4: Typical Uses

    DC P o we r S u p pl y T y p i c a l Us e s Typical Uses The Power Supply works well with a variety of electronic circuits, motors, lamps, heaters, and Peltier devices, including the PASCO apparatus listed below. Model Number Name Comments...
  • Page 5 Mo d el No . P I- 9 8 77 S p ec i f ic a t io n s Function 4: Stair Programmable maximum voltage (see page 25) 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...
  • Page 6 DC P o we r S u p pl y S peci ficati ons Experiment-design Considerations Please note the following properties of the Power Supply when planning an application: • The Power Supply is over-current protected, but it is not current-limited or current-regulated.

  • Page 7: Tutorial

    Tutorial This tutorial will introduce you to the DC 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: Use a data-acquisition program such as DataStudio with a voltage sensor. The sample waveforms shown in the tutorial were collected in this manner.
  • Page 8 DC P o we r S u p pl y T u t o r i a l Function 1: DC Voltage Turn the Function knob to the Constant DC Enter Set Maximum position ( ). The display briefly shows F1 or Edit Ramp Stair...
  • Page 9 Mo d el No . P I- 9 8 77 T u t o r i a l Quickly press and release . The Current LED lights, and the display now shows out- put current in amps. Press a few times to toggle the display between current and volt- age.
  • Page 10 DC P o we r S u p pl y T u t o r i a l 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 max- imum current has been exceeded and the out- put has automatically turned off (this will...
  • Page 11 Mo d el No . P I- 9 8 77 T u t o r i a l Function #2: Rectangle Wave Turn the Function knob to Rectangle Wave ). The display briefly shows F2, then 0.00 (the rectangle wave’s maximum-voltage setting).
  • Page 12 DC P o we r S u p pl y T u t o r i a l Press . The Time LED lights and the dis- play shows the rectangle wave’s period (in seconds). Turn the Coarse and Fine knobs to change the period to 0.13 s.
  • Page 13 Mo d el No . P I- 9 8 77 T u t o r i a l Press (DISPLAY) to display the period. Turn the Coarse knob to set the period to –2.00 s (a negative value). Press (START) to run the function and observe the waveform.
  • Page 14 DC P o we r S u p pl y T u t o r i a l Function 4: Stair Turn the Function knob to SET MAX. Set the Power Supply’s voltage limit to 8 V. Turn the Function knob to Stair ( ). The display briefly shows F4, then 1.00 (the voltage-step setting).
  • Page 15 Mo d el No . P I- 9 8 77 T u t o r i a l Function 7: PLAY (Custom Program) Turn the Function knob to PLAY. The dis- play briefly shows F7, then 100 (for a scale- factor setting of 100%).
  • Page 16 DC P o we r S u p pl y T u t o r i a l Press (DISPLAY); the Time LED lights and the display shows the step time (or time interval between points) in seconds. Set the step time to 0.10 s.
  • Page 17 Mo d el No . P I- 9 8 77 T u t o r i a l Turn the Coarse knob one detent counter- clockwise to view one of the stored points. Turn the Coarse knob some more (a few rotations) until you see Point #10;...
  • Page 18 DC P o we r S u p pl y T u t o r i a l ®...

  • Page 19: Basic Operation

    Mo d el No . P I- 9 8 77 B a s i c O p er a ti o n Basic Operation Connections Power Switch Connect the included AC Power Adapter to the POWER port of the Power Supply and to a power outlet (120–240 VAC, 50–60 Hz).
  • Page 20 DC P o we r S u p pl y B a s i c O p er a ti o n Safety Feature: Whenever the Power Supply enters Constant DC mode, the output voltage is automatically set to zero. Set Voltage Rotate Coarse knob to change the output voltage by 1.0 V per detent;...
  • Page 21 Mo d el No . P I- 9 8 77 B a s i c O p er a ti o n Voltage Limit When the Power Supply first enters SET MAX mode, the Voltage LED blinks slowly and the display shows the voltage-limit setting. Rotate the Coarse knob to change the voltage limit by 1.0 volt per detent;...

  • Page 22: Standard Functions (Rectangle, Ramp, And Stair)

    DC P o we r S u p pl y S t an d ar d F u nc t i on s ( Re c ta n gl e , R am p , a nd S ta ir ) Standard Functions (Rectangle, Ramp, and Stair) The Power Supply’s standard functions are simple, repeating patterns of voltage out- put that you can control by adjusting four or five parameters.
  • Page 23 Mo d el No . P I- 9 8 77 S ta n da r d Fu nc t i on s ( Re c t an gl e , Ra mp , an d S ta ir ) Ramp Ramp Parameters The Ramp function has four parameters: Maxi- Period...
  • Page 24 DC P o we r S u p pl y S t an d ar d F u nc t i on s ( Re c ta n gl e , R am p , a nd S ta ir ) To set the Period, press (DISPLAY).
  • Page 25 Mo d el No . P I- 9 8 77 S ta n da r d Fu nc t i on s ( Re c t an gl e , Ra mp , an d S ta ir ) Stair Stair Parameters The Stair function has five parameters: Maxi- Maximum...
  • Page 26 DC P o we r S u p pl y S t an d ar d F u nc t i on s ( Re c ta n gl e , R am p , a nd S ta ir ) To set the Minimum Voltage, press and hold (SET) until the Voltage LED starts blinking fast.
  • Page 27 Mo d el No . P I- 9 8 77 S ta n da r d Fu nc t i on s ( Re c t an gl e , Ra mp , an d S ta ir ) Standard Functions Run Mode To run any of the standard functions, turn the Function knob to (Rectangle Wave),...

  • Page 28: Custom Program

    DC P o we r S u p pl y Cu s to m P r o gr a m Custom Program The Power Supply’s custom program is a stored list of up to 99 voltage points. The Power Supply comes pre-loaded with a positive off-set sine wave program. If you change or erase this program, your changes will be remembered even if you turn the Power Supply off.
  • Page 29 Mo d el No . P I- 9 8 77 Cu s to m P r o gr a m Edit Program Edit mode: Use Program Edit mode to delete and insert points in the existing program. • Function knob in To enter Program Edit mode (from Program Home mode) turn either the PROGRAM position COARSE or FINE knob;...
  • Page 30 DC P o we r S u p pl y Cu s to m P r o gr a m Scale Factor is the percentage of the programed voltages that will be output. If Scale Factor is 100%, then the actual programed voltages are output; if Scale Factor is 50%, the actual output voltages are half of the programed values.
  • Page 31 Mo d el No . P I- 9 8 77 Cu s to m P r o gr a m played twice in a row, so the total number of points in a full cycle is twice the number of programed points minus two. The table below shows some examples. Number of Step Time Auto-...
  • Page 32 DC P o we r S u p pl y Cu s to m P r o gr a m To stop playing the program and return the Power Supply to set-up mode, press and hold (STOP). You can do this while the program is either playing or paused.
  • Page 33 Mo d el No . P I- 9 8 77 Cu s to m P r o gr a m Variable Step Height Settings Graph Type Step Time Auto-repeat Voltage values 0, 3, 5.5, 7.5, 9, 10 The standard step function requires each step to have the same height. This custom program allows a different height for each step.
  • Page 34 DC P o we r S u p pl y Cu s to m P r o gr a m Exponential Settings Graph Type Step Time Auto-repeat 0.5 s Voltage values 0.00, 0.02, 0.05, 0.09, 0.14, 0.21, 0.31, 0.43, 0.61, 0.84, 1.15, 1.58, 2.15, 2.92, 3.97, 5.38, 7.28, 9.85, 13.32, 18.00 0.6 t The Scale Factor is 50%.

  • Page 35: Technical Support

    Copyright The PASCO scientific 012-09125A DC Power Supply Instruction Manual is copyrighted with all rights reserved. Permission is granted to non-profit educational institutions for reproduction of any part of this manual, providing the reproductions are used only in their lab- oratories and classrooms, and are not sold for profit.