PASCO Specialty & Mfg. PI-8127 User's Manual
Contents
1. knob to select a waveform or menu item Function Generator Voltage Adjust To move the underline from the Frequency part of the LCD to the Voltage part of the LCD turn the Voltage Adjust knob one click to the left or right Notice that the underline is below the ones place in the display 0 00 V Turn the knob one click to the right clockwise to increase the voltage output Each click to the right clockwise or left counterclockwise will incre ment or decrement the digit that is underlined in the display When you reach 9 00 V the next click to the right will change the voltage to 10 00 V Notice that the underline stays below the ones place Resolution Selection Use the Resolution Selection buttons below the Frequency Adjust knob to change the active underlined digit in the voltage display Pushing the left button moves the underline to the left and pushing the right button moves the underline to the right Operation 1 b00kHz G Bel H HHA rms Voltage Adjust display Use both the Voltage Adjust knob and the Resolution Selection buttons to set the volt Resolution Selection buttons age Remember that you can push the OUTPUT STANDBY button to disable the out put while you adjust the voltage and then push the button again to enable the output when you have the voltage set the way you want To move the underline back to the Frequency part of the LCD turn the Frequency Adjust k2. generator s output is on Standby Example display i Vireze 7 Function Generator Some Suggested Uses Other Current Several displays show the root mean square rms output current 0 00A rms The The name root mean square Function Generator calculates the true root mean square of the output current not just Comes from the fact that it Is the the peak current divided by the square root of two The output current depends on the S44are a eg eave squares of the values output voltage and the resistance of the device or circuit to which the generator is con nected For example if you set the generator to output 5 00 V DC and connect the output to a 10 ohm resistor the output current display will show approximately 0 50A rms If you change to a Sine Wave the current will read 0 707 x 0 5A 0 35A rms Trigger Output TRIGGER On the rear panel is a BNC connector labeled TRIGGER OUT TTL If you want to OUT TTL trigger an oscilloscope synchronously with the generator output just connect the TRIGGER OUT TTL connector to the external trigger of the oscilloscope cable not included USB Port for Firmware Update Next to the TRIGGER OUT TTL connector on the rear panel is a USB port The 2 USB port allows a USB cable not included to be connected from a computer to the Function Generator so that its firmware can be updated Go to www pasco com downloads for instructions USB Port Some Sugge
3. in a resistor capacitor as the PASCO RLC Circuit Board and measure the voltage across the PUGUI AVER ye SUAT wae resistor as the generator drives the circuit with a square wave 8 PASC Ce Model No PI 8127 Specifications Specifications Input Power 15Vat1 6A Voltage Output 10 Vatupto1A Frequency Range DC to 100 kHz with two ranges 0 001 Hz to 999 999 Hz and 0 001 kHz to 100 000 kHz 150 kHz for Sine Wave Frequency Resolution 0 001 Hz for the lower range and 1 Hz for the upper range Offset Voltage 10 V External Voltage Input 10 V Maximum Trigger Output TTL compatible 0 to 5 V Waveforms Sine Square Triangle Positive Ramp Negative Ramp DC Mod Sine Mod Square Mod Pos Ramp Mod Neg Ramp Default Displays Frequency Voltage Current Waveform Display LCD Graphics Monochrome 128 by 64 pixels 2 level Backlight Technical Support For assistance with any PASCO product contact PASCO at Address PASCO scientific 10101 Foothills Blvd Roseville CA 95747 7100 Phone 916 786 3800 worldwide 800 772 8700 U S Fax 916 786 3292 Web Www pasco com Email support pasco com Limited Warranty For a description of the product warranty see the PASCO catalog Copyright The PASCO scientific 012 10425A Function Generator Instruction Manual is copyrighted with all rights reserved Permission is granted to non profit educational institutions for reproduction of any part of this man
4. jack On Off To turn the Function Generator on press the Power button on the lower left corner of the front panel Press the Power button again to turn 1 7 MMM le H Fal the Function Generator off A BHL H HBA rms Default Settings The displayed default settings when the Function Gen erator is first turned on are 1 000 kHz frequency 0 00 V output volt age 0 00 A output current and sine wave waveform The waveform symbol is shown at the lower left corner of the LCD NEALE Settings that are not shown by default are the voltage offset 0 00 V and the voltage limit maximum voltage which is 10 0 V the short circuit current limit maximum current which is 1 50 A the backlight setting High and the sweep setting Off See the Menus section for more information 2 TEIH Model No PI 8127 Output Connect a device such as a speaker wave driver or electrical circuit to the output jacks at the lower right corner of the front panel Frequency Adjust The Frequency Adjust knob serves two purposes Turn the knob to change the fre quency Press the end of the knob as if it were a button to toggle between the two fre quency ranges Range Selection The default range is 0 001 kHz to 100 000 kHz or 150 000 kHz for the sine waveform other waveforms are distorted above 100 kHz The other range is 0 001 Hz to 999 999 Hz Press the end of the Frequency Adjust knob as if it were a button to switch betwee
5. Instruction Manual 012 10425A Function Generator Pl 8127 Frequency Adjust Waveform knob and Range Selection Selection button button Menu button Voltage Adjust knob and Menu Selection button Liquid Resolution Crystal Selection jacks Display lt Standby buttons 4 mm LCD Power button button Included Equipment Part Number Function Generator AC to 15 V DC 1 6 A power adapter not shown 540 057 Examples of Compatible PASCO Equipment See the PASCO Catalog for details Mechanical Wave Driver SF 9324 Open Speaker WA 9900 AC DC Electronics Laboratory EM 8656 RLC Circuit Board Cl 6512 f B To 800 772 8700 www pasco com Function Generator Introduction Introduction The PASCO Function Generator outputs waveforms that include DC direct current as well as sine square triangle positive ramp and negative ramp with a frequency range of 0 001 Hz hertz to 100 kHz kilohertz The sine waveworm retains its form up to a frequency of 150 kHz but the other waveforms will show some distortion above 100 kHz Its 10 watt power output up to 10 volts and up to 1 amp makes it useful for driving speakers string vibrators and circuits Features 1 i MMP k H Liquid Crystal Display LCD The liquid crystal display LCD shows frequency voltage current and waveform The lower right section of the H BA H BBA rms LCD also shows other information such as the voltage offset of th
6. The minimum voltage is 0 00 V Woltage Limit 10 OV 4 BEA Voltage Limit display I Limit current limit The default maximum current in the Current Limit display is 1 50 A Turn the Voltage Adjust knob to change the maximum current from 1 50 A to 1 10 A or to 0 55 A Press the Voltage Adjust knob as if it were a button to select the current limit Setting the maximum current is useful when there needs to be a limit to the current applied to a circuit This is a safety feature to protect against short circuit overload H SSA 1 169A 1 5A Current Limit display Backlight The default backlight setting is High Use the Voltage Adjust knob to select the menu choice Press the Voltage Adjust knob as if it were a button to toggle switch to the other choice Low The Low setting is useful when the Function Generator is in a darkened environment Sweep Turn the Voltage Adjust knob so the pointer is next to Sweep and then press the knob as if it were a button to select the choice The default setting is Off The Sweep menu options offer several ways to tailor the output signal for specific needs The Sweep function is set up so that the output signal begins at a specific fre Sweep quency Initial and ends at another specific frequency Final The sweep between frequencies can be set to last for a certain time Duration and the step frequency Step can also be set for a specific amount Th
7. angle Fositive Ramp Hegat ive Ramp OL Next WAVEFORM menu PASC Ce Model No PI 8127 Operation DC voltage a adjust External screen Mod Sine Hod Triangle Continue to turn the Voltage Adjust knob counterclockwise to reveal the next five Hod Fos Ramp waveform choices External Mod Sine Mod Triangle Mod Pos Ramp and Mod Neg OO Neg Kamp Ramp Mod is an abbreviation for modulated Last WAVEFORM menu External Input The External waveform choice corresponds to the use of an external input to the Function Generator The generator has positive and negative input jacks on the rear panel Maximum input voltage is 10 V The Function Generator amplifies the power of the input signal up to a maximum of 10 watts up to 1 amp at up to 10 volts expressed as a percentage of maximum Turn the Voltage Adjust knob to decrease or increase the power amplification Percent 1 Mi modulation u m H HHA rms External waveform oo display Modulated Waveforms The modulated Mod waveform choices also correspond to the use of an external input to the Function Generator through the input jacks on the rear panel When a modulated Mod waveform is selected the signal produced by the Function Generator will be multiplied by the signal from the external input 1 600kHz l sa 6 BIA rms Mod Sine filh waveform display Change the frequency of the Function Generator s signal with the Frequency Adjust kn
8. e quency use the Voltage Adjust knob to select Step and press the knob as if it were a button Use the Frequency Adjust knob and the Resolution Selection buttons to change the step frequency The range for the step frequency is from 0 001 Hz to 100 000 kHz or 150 kHz for the Sine waveform In general it is best to pick a step frequency that is less than the difference between the initial and final frequencies Duration display step Frequency In general it is best to Remember you can press the pick a step frequency that Frequency Select knob as if it were a is less then the difference button to switch the frequency range i m AAAH z Step between the initial and final frequencies Frequency display Press the Voltage Adjust knob as a button to return to the menu of Sweep options Press the MENU button to exit the menu of Sweep options and press the MENU but ton again to exit the main menu Standby When a sweep function other than Off is selected the genera 1 1 a AAAH Fal tor automatically goes into the Standby condition That is the generator will not output its signal until the OUTPUT STANDBY button is pressed 2 BAL A AGA rms Press the OUTPUT STANDBY button again to disable the output 1 BB Offset The Example display shows Frequency at 100 000 Hz Voltage at 2 00 V Sweep tan dby output current at 0 00 A V Offset voltage offset at 1 00 V Sine wave form Sweep function is On and the
9. e Sweep function can be set to one of the following e Off The default setting Operation Press the MENU button or the Voltage Adjust knob to return to the MENU choices Press the MENU button again to return to the screen before the MENU button was pressed the first time NOTE As the current approaches the limit Overcurrent will be dis played at the bottom of the LCD The Overcurrent warning will be dis played at approximately 1 2 A for the 1 50 A limit 1 0 A for the 1 10 A limit and 0 5 A for the 0 55 A limit Ll OFF set A Be Ll Limit 14 Hel I Limit 1 5684 Back Light Low SWEED OFF Backlight Low OFF Initial 186 HHH Final CAH ARRHS Duration Ss Step Hone Sweep options PASC Ce Model No PI 8127 Operation e Single The frequency sweeps from the initial frequency to the final frequency one time e Repeat The frequency sweeps between the initial and final frequencies repeat edly Swee Bidir e Bidir bidirectional The frequency sweeps from the initial frequency to the final THit al 1AA AAAH frequency and then back to the initial frequency repeatedly Final CAA AAAH Duration Ss Step Hone Sweep bidirectional Press the Voltage Adjust knob as if it were a button to step through the Sweep choices Press the MENU button to return to the previous display or use the Voltage Adjust knob to move the pointer to another choice Initial The default init
10. e out l BB Offset put if any whether a frequency sweep is on and whether the output is on standby Sweep Standby LCD shows frequency voltage Frequency Range Selection There are two frequency ranges 0 001 Hz current and waveform as well as other information to 999 999 Hz and 0 001 kHz to 100 000 kHz 150 kHz for the sine such as the voltage offset and sweep condition waveform When the Function Generator is first turned on the default frequency is 1 000 kHz Press the Frequency Adjust knob as if it were a button to switch between ranges Output Standby Pushing the Output Standby button disables the output without changing settings This allows you to change settings with the output off Press the button again to enable the output Output Current Voltage Maximum The maximum current or maximum voltage can be set using a menu This is useful when the voltage applied to a circuit needs to be limited The LCD displays the output voltage and current Offset Voltage Any waveform can be offset up or down with a DC voltage ranging from 10 V to 10 V provided the peak voltage does not exceed 10 V Frequency Sweep Sweep between two frequencies at a selectable rate C 0O 16V 1 86A REGULATED Operation Power Connect the plug from the AC to 15 V DC adapter to the power jack on the lower right corner of the back panel of the Function Generator Connect the power cord for the adapter to an appropriate electrical outlet Power
11. ial frequency is 100 000 Hz Turn the Voltage Adjust knob so the pointer is next to Initial and then press the knob to select the choice Use the Fre quency Adjust knob and the Resolution Selection buttons to set the initial frequency Remember that you can press the Frequency Adjust knob as if it were a button to 1 A AAAH T switch frequency ranges Press the Voltage Adjust knob again to return to the menu of 5 Sweep options Initial Frequency Initial Frequency display Final The default final frequency is 500 000 Hz As with the initial frequency use the Voltage Adjust knob to select the choice and the Frequency Adjust knob and Res olution Selection buttons to set the final frequency Press the Voltage Adjust knob as if it were a button to return to the menu of Sweep options va AAAH T Mr a Duration The default duration for the sweep is 5 seconds As with the initial fre quency use the Voltage Adjust knob to select the choice Use the Voltage Adjust knob and the Resolution Selection buttons to change the duration time The minimum is 1 second and the maximum is 9999 seconds 2 h 46 min 39 s Press the Voltage Ou rat ion Adjust knob as if it were a button to return to the menu of Sweep options Final Frequency Final Frequency display Step The default step frequency is None This means that the default frequency 55 sweep will be continuous from the initial to the final frequency As with the initial fr
12. n ranges The default frequency for the lower range is 1 000 Hz Frequency Adjust The default frequency for the default range is 1 000 kHz Notice that the 1 1s underlined in the display This indicates that this is the digit that will change first when you turn the knob For example turn the knob one click to the right clockwise and the frequency increases to 2 000 kHz Each click to the right clockwise or left counterclockwise will increment or decrement the digit that is underlined in the display When you reach 9 000 kHz the next click to the right will change the frequency to 10 000 kHz Notice that the underline stays below the ones place Turning the frequency knob one more click to the right changes the frequency to 11 000 kHz As a second example if the frequency is 1 000 kHz turning the Frequency Adjust knob one click to the left counterclockwise does not decrease the frequency to 0 000 kHz Instead the frequency stays at 1 000 kHz it is not possible to have zero frequency To lower the frequency press the right hand Resolution Selection button to move the underline to the right 1 000 kHz and then turn the Frequency Adjust knob counterclockwise one click to decrease the frequency to 0 900 kHz Resolution Selection Use the Resolution Selection buttons beneath the Frequency Adjust knob to change the active underlined digit in the display Pushing the left button moves the u
13. nderline to the left and pushing the right button moves the under line to the right Use both the Frequency Adjust knob and the Resolution Selection buttons to set the frequency Remember that you can push the OUTPUT STANDBY button to disable the output while you adjust the frequency and then push the button again to enable the output when you have the frequency set the way you want Clear Feature While adjusting the frequency you can clear zero all the digits to the right of the underline cursor by pressing the Voltage Adjust knob as if it were a button Voltage Adjust The Voltage Adjust knob serves three purposes e Turn the knob to change the output voltage e When the LCD shows the waveform list or the menu turn the Voltage Adjust knob to move the pointer up or down in the list or in the menu e Press the knob as if it were a button to select a choice from the waveform list or from the menu PASC Ce Operation NOTE To set up the frequency volt age and other parameters without outputting a signal press the OUTPUT STANDBY button Make the adjustments and press the OUTPUT STANDBY button again to begin the signal FREQUENCY Press the Frequency Adjust knob to change the range 10 GB kHz NOTE You can conveniently go to the lowest frequency without overshooting by rapidly turning the Frequency Adjust knob 1010 OOG Resolution Selection buttons VOLTAGE Press the Voltage Adjust
14. nob one click to the left or right Waveforms Sine SQW are Press the WAVEFORM button to open the first waveform menu The menu shows Triangle five choices Sine Square Triangle Positive Ramp and Negative Ramp with the pointer at Sine Turn the Voltage Adjust knob one click to the left counterclock wise to move the pointer from Sine to Square Press the Voltage Adjust knob as if it were a button to select the choice The LCD will show the Square wave icon in the lower left corner Positive Ramp Hegat ive Ramp First WAVEFORM menu Sine Square Triangle Positive Ramp and Negative Ramp waveforms Frequency 1 000 kHz Voltage 2 00 V Vertical scale 1 V div Horizontal scale 1 ms div Press the WAVEFORM button again to return to the first waveform menu Notice the down pointing arrow at the lower left corner This indicates that there are more choices on the menu Turn the Voltage Adjust knob counterclockwise to move the pointer to Negative Ramp Turn the knob one more click counterclockwise to show the next choice in the menu DC or direct current Notice that the menu now has an up pointing arrow at the upper left corner as well as the down pointing arrow in the Rl lower left corner DC Press the Voltage Adjust knob to select the DC choice Notice that the LCD shows only voltage and current Turn the Voltage Adjust knob to increase or decrease the voltage 10 V maximum SQ are Tri
15. ob Adjust the percent modulation with the Voltage Adjust knob The formula for the percent modulation is based on the amplitudes of the peak P and the trough T of the modulated signal P T percent modulation PT x 100 Mod Sine waveform Input signal is 1 KHz at 2 00 V Mod Sine signal When the percent modulation is 100 the trough amplitude is zero is 0 100 kHz at 100 Menus U Offset a a0 WI Limit l Bel Press the MENU button to show the list of choices V Offset voltage offset V Limit I Limit 1 SHA voltage limit I Limit short circuit current limit Backlight and Sweep The pointer Back ight High is at V Offset Turn the Voltage Adjust knob to move the pointer up or down among Sweep OFF the choices Press the Voltage Adjust knob as if it were a button to select a choice MENU choices PASC O 5 Function Generator V Offset voltage offset The default voltage offset in the Voltage Offset display is 0 00 V Use the Voltage Adjust knob and the Resolution Buttons to increase or decrease the DC voltage Any waveform can be offset up or down with a DC voltage ranging from 10 V to 10 V provided the peak voltage does not exceed 10 V Woltage Offset 0 00V Voltage Offset display V Limit voltage limit The default maximum voltage in the Voltage Limit display is 10 00 V Use the Voltage Adjust knob and the Resolution Selection buttons to change the maximum voltage from 10 00 V to another voltage
16. sted Uses In addition to the usual uses of a function generator such as providing sine wave sig nals for electronics laboratories the PI 8127 Function Generator 1s particular suited for experiment in waves and acoustics Drive a speaker or several speakers with the Function Generator Accurately set the frequency to any level in the acoustic range or beyond This makes it particularly con venient for experiments such as measuring the speed of sound observing the interfer ence and diffraction of sound waves and investigating acoustic resonance in a cavity Use the Function Generator with the PASCO Resonance Tube see www pasco com to investigate resonant modes and the speed of sound in a closed or open tube Use the Function Generator with the PASCO Sonometer and Driver Detector Coils to measure resonant frequencies and harmonics and the location of nodes and antinodes on a wire The built in amplifier makes it an ideal device for driving mechanical wave experiments Use the generator with a PASCO Mechanical Wave Driver to examine the resonance modes in a vibrating wave cord Experi ment with the motion of waves in two dimensions by using sand on the thin metal plates of the PASCO Chladni Plate Kit Use the generator with the PASCO Coupled Harmonic Oscillators to study coupled harmonic motion of two or more gliders on an air track Connect the Function Generator to a resistor capacitor RC circuit such Voltage across ni kei
17. ual providing the reproductions are used only in their laboratories and classrooms and are not sold for profit Reproduction under any other circumstances without the written con sent of PASCO scientific is prohibited Trademarks PASCO PASCO scientific DataStudio PASPORT Xplorer and Xplorer GLX are trademarks or registered trademarks of PASCO sci entific in the United States and or in other countries For more information visit www pasco com legal Windows is a registered trade mark of Microsoft Corporation in the United States and or other countries Mac is a trademark of Apple Computer Inc registered in the U S and other countries Product End of Life Disposal Instructions This electronic product is subject to disposal and recycling regulations that vary by country and region It is your responsibility to recycle your electronic equipment per your local environmental laws and regulations to ensure that it will be recycled in a manner that protects human health and the environment To find out where you can drop off your waste equipment for recycling please contact your local waste recycle disposal service or the place where you purchased the product The European Union WEEE Waste Electrical and Electronic Equipment symbol to the right and on the prod uct or its packaging indicates that this product must not be disposed of in a standard waste container je TEIH 9
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