Manual of Operation - SparkFun Electronics
Contents
1. 26000 uSec 1500 servo nurture position Servo Pos mode Step size of pulse Runs ode i ne Run mode SV RunRate Duration of one step G65 Second 04 in Servo Run mode SV Cycle Servo signal cycle 0 26000 uSec 20000 SV AMPmax The maximum pulse 0 10 0V 50V amplitude allowed When a setting is set to a value out of acceptable range the instrument behaviour is not defined In this mode the generator outputs servo control signal with changing pulse width The pulse width change step rate and range are user settable States JYE Tech When Servo Run mode is first entered it stays at Ready state In this state a constant signal with pulse width equal to SV PWmin is generated When WF button is pressed it transfers to Running state In this state pulse width will change from SV PWmin to SV PWmax incrementally in step defined by SV RunStep Once it reaches SV PWmax it will immediately change in the reverse direction i e from SV PWmax to SV PWmin incrementally with the same step size Pulse width will vary in this way until WF key is pressed Fur When WF key is pressed in Running state the generator will enter Hold state where pulse width stops varying and maintains the value at the moment WF key 1s pressed 9 www jyetech com DN085 01v03 Change Settings Settings that affect Servo Run mode behaviour include SV PWimin SV PWmax SV RunStep and SV RunRate These settings can be changed by u2. Frequency Range In spite of that no limited range is set for frequency entry it should be aware of that there are practical ranges for output frequency due to the low resolution 8 bit DAC and slow sample rate 2 5Msps Out of these ranges signal quality will degraded as larger distortions and jitters appear The acceptable ranges depend on actual applications For FGO85 output frequency within following range is reasonably good for most applications Sine 0 200KHz Square 0 1OKHz Triangle 0 1OKHz Ramp 0 1OKHz Staircase 0 1OKHz Amplitude is set by first pressing AMP key The current display will be erased and an underline is shown allowing user to enter new value New value is entered with Data Entry keys and followed by one of the Unit keys Alternatively amplitude can be changed incrementally by using the rotary encoder when it is focused The displayed amplitude value is peak to peak value The amplitude range is limited by the DC offset setting since IVac peakl IVdcl lt 10 V into High Z D C Only The output of the FG085 can be set to a DC level by entering amplitude of OV When the amplitude is set to zero the A C waveform will be completely shut off and the FGO85 may be used as a DC voltage source DC offset can be set by first pressing OFS key The current display will be erased and an underline is shown allowing user to enter new value New value is entered with Data Entry keys and
3. To change output waveform to square wave press WF until SQR is shown 3 To set output amplitude to 3V peak to peak press the following keys AMP 3 V 4 To set DC offset to 2 5V press the following keys OFS 2 5 V Note This feature may not yet be implemented with current version firmware However its hardware support is provided in the design JYE Tech 1 www jyetech com 2 Front Panel Features 13 DN085 01v03 F e Q 8 5 miniDDS Function Generator see OUTPUT E te MODE F T AMP OFS POWER ooo 1 Power Switch 2 Parameter Keys 3 Data Entry Keys JYE Tech Front view of 08503 The power switch turns the FG085 on and off The parameter keys select the parameter to be entered If cursor is not currently at a parameter pressing the parameter key will first move cursor to that parameter The numeric keypad allows for direct entry of the FG085 s parameters To change a parameter value simply press the parameter key if cursor is not currently at the parameter press the parameter key twice and then type a new value Entries are terminated by the UNITS keys If an error is made at typing press ESC key to correct it back space If no more digits left when ESC is pressed it will exit Data Entry and display the previous value The key may be pressed at any time during numeric entry 2 www jyetech com DN085 01v03 4 Unit Keys The
4. UNIT keys are used to terminate numeric entries Simply press the key with the desired units to enter the typed value 5 Waveform Key This key selects output waveform Repeated pressing of this key will go through all available waveforms 6 ESC key This key back space typed digits and or exit current state 7 Rotary Encoder Rotary encoder can incrementally adjust a focused parameter up and down To do this first pressing a parameter key to move cursor the parameter to be changed and then turn the encoder Pressing rotary encoder will enter Setting Change state 8 MODE Key This key selects FGO85 s working modes 9 Frequency Period Display of current output frequency or period 10 Waveform Display of current waveform type 11 DC Offset Display of current output DC offset 12 Amplitude Display of current output amplitude 13 Cursor Indication of currently focused parameter Turning rotary encoder will change this parameter 14 Function Output This is the front output connector Its output impedance is 50Q J4 3 Connectors HMETECH COM PUNSUN GENERATOR e o o 0 9 JYET A O a 4 0 6 O M a an PN 109 08500 00F Front view of 08501 08502 JYE Tech 3 www jyetech com e FGO85 miniDDS FUNCTION GENERATOR ory PN 109 08500 00G 1 Power Input J1 2 Function Output J5 3 USB J10 4 Alternative USB J7 5 Contrast Adjustment 6 U5 Programming
5. followed by one of the Unit keys Alternatively offset can 6 www jyetech com DN085 01v03 be changed incrementally by tuning ADJ when it is focused In general the DC offset may range between 5V but it is limited such that Vac peakl IVacl lt 10 V into High Z or Vac peak IVdel lt 10 V into HIGH Z Increment and FG085 s output frequency amplitude and DC offset can be Decrement changed incrementally up and down by using the rotary encoder To do this first move cursor to the parameter you want to change by pressing a parameter key and then turn the rotary encoder clock wise for increment and counter clock wise for decrement Servo Position Mode In this mode the generator outputs servo control signal with specific pulse width amplitude and cycle All these parameters can be set independently by user Servo Control Signal The drawing below shows a servo control signal Pulse Width see amplitude H Cycle Typically servo signal takes following parameters 1 Cycle 20ms 2 Pulse Width 1ms 2ms 3 Pulse Amplitude 5V The pulse width determines servo position Screens The photo below shows the screens of Servo Position Mode The first screen shows pulse width in unit of microsecond The second shows pulse amplitude in unit of volt Pressing F T will display the pulse width screen and pressing AMP will display the amplitude screen Faos laH yec JYE Tech 7 www
6. DN085 01v03 FG085 miniDDS Function Generator Manual of Operation Applicable Models 08501 08501K 08502K 08503 08503K Applicable Firmware Version 1 113 08501 100 or later for U5 2 113 08502 030 or later for U6 1 Getting Started Introduction The FGO085 is a low cost versatile function generator capable of producing continuous swept waveforms and servo test signals It was designed as an easy to use tool for electronic hobbyists The operation of FG085 is extremely straightforward The following examples will lead you step by step through some typical uses Data Entry Setting of FGO85 signal parameters is done by pressing the key with a parameter label under it F T for example for frequency or period The current display will be cleared and an underline will be shown indicating place for new value to be typed in If at the moment you hit a parameter key the cursor is not currently at the parameter just press the key one more time to make the underline shown Then enter new value using the DATA ENTRY keys Complete entry by hitting one of the UNITS keys If an error is made at typing pressing ESC key will do backspace to correct it If no more digits left when ESC is pressed it will exit Data Entry and display the previous value A cursor focused parameter may also be adjusted incrementally by tuning ADJ rotary encoder Examples 1 To set output frequency to SKHz press the following keys F T 5 KHz 2
7. Port J8 JYE Tech DN085 01v03 U6 PGM Ep id ic ERE Ly y ma On Fag bbk m A Ai L Board view of 08503 This is the DC power supply input connector Its center core should be connected to the positive pole of power supply FG085 is specified for 14V DC The current capacity of power supply should be greater than 200mA average This is the back output connector Its output impedance is 50Q This provides a connection to PC for waveform data download and instrument control This connector allows wiring the USB connection to socket at enclosure This is a resistor trimmer for LCD contrast adjustment This is the programming header for the main controller ATmegal68 U5 Pin out Description sv PWR 3 Nc Nocomection a Reserved me Reseed o o o miso o USprogramming wo oo ew SS 4 www jyetech com DN085 01v03 7 U6 Programming This is the programming header for the DDS core controller Port J6 ATmega48 U6 Pin out Description pa py pw SE mea ap Reserved oo 6 Reserved s oo pwrp SS o miso 0 U6programming wo oo ew SS 4 FG085 Operations Power on Push down the power switch to turn on FGO085 It will first display model number and firmware version Then a customizable screen will be displayed This takes about two seconds and the unit enters normal working state Output The output amplitude display is only correct when load is in high impedance much la
8. dance 50 ohm Y Power supply voltage 14V DC y Current consumption lt 150mA without loading Y Circuit board size 155mm X 55mm JYE Tech 11 www jyetech com
9. ed is greater than SV AMPmax then the input will be substituted by SV AMPmax The default value of SV AMPmax is 5 0V It can also be changed in Change Setting state see below At either pulse width screen or amplitude screen user can turn ADJ to incrementally change pulse width or amplitude The step size of incremental change for pulse width is defined by SV PWinc another setting that can be modified by user see below Servo signal settings are a number of EEPROM stored values that affect the behaviour of servo signal generation These values are user changeable In order to change these values pressing ADJ to enter Setting Change state The following screen will be displayed The top line shows a setting name The bottom line shows its value The number at top right corner indicates current menu position To change a setting first scroll to that setting by turning ADJ Then press F T to enter a new value Pressing ESC will exit Setting Change state Restore factory default Factory default settings can be restored by scroll to the last item and pressing WF key www jyetech com Servo Run Mode DN085 01v03 The following table lists the details about servo signal settings Setting Descriptions o tapie Default ange SV PWmin The minimum pulse 9 26000 uSec 1000 width allowed SV PWmax The maximum pulse 26000 uSec 2000 width allowed Pulse width SV PWmid corresponding to 0
10. jyetech com Pulse Width and Cycle Pulse Amplitude Increment and Decrement Servo Signal Settings JYE Tech DN085 01v03 At pulse width screen pressing F T will erase current display and show an underline allowing user to enter new pulse width New pulse width is entered with Data Entry keys and followed by one of the two Unit keys The value entered is treated as microsecond if the unit key Sec is used or as millisecond if the unit key mSec is used Please note that the range of pulse width that user can actually enter is limited by two values SV PWmin and SV PWmax If the pulse width you input is out of the range defined by SV PWmin and SV PWmax then the input will be substituted by the limit numbers These limiting values can be modified by user see below The default values of SV PWmin and SV PWmax are 1000 uSec and 2000 uSec respectively Servo signal cycle can be changed too This is done by modifying the setting SV Cycle in Setting Change state see below At pulse amplitude screen pressing AMP will erase current display and show an underline allowing you to enter new pulse amplitude Enter new pulse amplitude with Data Entry keys and follow by one of the two Unit keys The number you entered is treated as volt if the unit key V is used or as mill volt if the unit key mV is used Like pulse width the maximum of amplitude that user can enter is limited by the value of SV AMPmax If the amplitude enter
11. rger than 50Q If load impedance is close to 50Q the oupput amplitude will be lower then displayed If load impedance is 50Q the output amplitude will half of that displayed Mode Selection FG085 can work in one of three different modes The three modes are 1 Continuous Waveforms CW mode 2 Servo Position mode 3 Servo Run mode Pressing Mode button will display the mode selection menu lect Mode Tuning ADJ will scroll through these modes The number at the lower right corner indicates menu position Pressing WF will select the mode displayed Pressing ESC will exit Mode Selection without change Continuous Waveform CW Mode In this mode the generator outputs continuous signal of various waveforms Signal frequency amplitude and DC offset can be independently set by user Screen Please refer to Section 2 Front Panel Features JYE Tech 5 www jyetech com Waveform Selection Frequency Amplitude DC Offset JYE Tech DN085 01v03 Waveform selection is done by pressing WF key Frequency is set by first pressing F T The current display will be erased and an underline is shown allowing user to enter new value New value is entered with Data Entry keys and followed by one of the Unit keys Alternatively frequency can be changed incrementally by using the rotary encoder when it is focused Frequency can also be set in period Press F T key will toggle between frequency and period entry mode
12. ser Please refer to paragraph titled Servo Signal Settings above for details 5 Customizable Power up Screen At powering up a customizable screen is displayed after model and firmware information is shown This screen contains 32 characters that can be defined by sending a string to FG085 via USB connection from a PC To do this you need 1 APC serial communication application 2 AminiUSB B cable that connects FG085 to a PC USB port 3 Select appropriate port and set communication format to 115200 n 8 1 4 When FG085 is in normal working state regardless modes send a string in the format that is started with Z immediately followed by 32 ASCII characters you want to display and ended by The string looks like this Z 32 ASCII characters When the sending is successful you will get a character G returned Otherwise you may get or nothing 5 Verify by powering off the unit and power up again 6 Firmware Upgrading From time to time there may be a need to upgrade firmwares in order to add features or improve performance FG085 contains two AVR micro controllers from Atmel 1 ATmegal68PA U5 which is the main controller of the instrument 2 ATmega48PA U6 which is the DDS core To upgrade firmware an AVR programmer with compatible programming header is required For programming header pin out please refer to drawings under section Connectors If the programming header you ha
13. ve has a different pin out You need to re route the signals to make them match JYE Tech s USB AVR Programmer PN 07302 is ideal for FG085 programming Please visit www jyetech com for details Download updated firmware files from JYE Tech website www jyetech com and follow instructions of the programmer you have to carry out firmware upgrading About Fuse Bits AVR micro controllers contain some fuse bits that configure the chip for specific applications In most cases these fuse bits should not be touched at firmware upgrading But if somehow these bits are changed they should be restored as follows 1 ATmegal68PA U5 Extended Fuse Byte 0b00000111 0x07 High Fuse Byte 0b11010110 0xD6 Low Fuse Byte 0b11100110 OxE6 2 ATmega48PA U6 which is the DDS core Extended Fuse Byte 0b00000001 0x01 High Fuse Byte 0b11010110 0xD6 Low Fuse Byte 0b11100000 OxEO JYE Tech 10 www jyetech com DN085 01v03 7 Technical Support For any technical issues or questions in using the instrument please contact JYE Tech at support jyetech com Or post your questions at JYE Tech forum at http forum jyetech com 8 Specification y Frequency range 0 200KHz Sine Y Frequency resolution 1Hz y Frequency accuracy 100 ppm y Period resolutions lms Amplitude range 0 10V peak to peak Y D C offset range 5V 5V y Waveform memory length 256 bytes Sample rate 2 5Msps Y Output impe
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