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Æ20125

10 MHz Sweep DDS
Function Generator

Assembly and

Operation Manual

Summary of Contents for AE20125

Page 1: ...20125 10 MHz Sweep DDS Function Generator Assembly and Operation Manual...

Page 2: ...REV 3 1 EN 2015 Ascel Electronic...

Page 3: ...v AE20125 Sweep DDS Function Generator 1 Circuit Description 2 Soldering 4 Component Reference 6 Assembly 14 Calibration 17 Troubleshooting Checklist 18 Power Supply 20 Case Mounting 21 Operation 23...

Page 4: ...ning the case Work on devices only if you made sure that they are disconnected from any power supply and any possible charge inside is discharged Devices must only be used if they are mounted in a cas...

Page 5: ...hops the use of this unit must take place under the supervision of qualified staff Do not put this unit in use in an environment where the risk of fire or explosion or explosive gas vapor or dust is p...

Page 6: ...the appropriate regulations for electronic devices All accompanying papers in particular this manual must also be passed over Where necessary for example in the European Union you must also publish y...

Page 7: ...ng from a fabric seat removing some types of plastic packaging or using non ESD compliant tools Danger of ESD The high voltage pulse can easily destroy electronic parts ICs and FETs are very sensitive...

Page 8: ...en used as a timebase for PLL are some of the advanced functions The USB interface2 allows remote control of the function generator with the included software The easy plain text command protocol allo...

Page 9: ...from a finite number of steps This signal always contains unwanted high frequency components A reconstructi on filter is needed to remove these components from the signal The filter is composed of L1...

Page 10: ...he output signal of the AD9833 removing its own DC offset Note This causes a slight attenuation of signals below 12 Hz The supply voltage of 14 to 18V DC is fed through the protection diode D1 and buf...

Page 11: ...rotective glasses If you use additional flux make sure it is suitable for electronics use Non suitable flux may contain acid which will damage the traces on the PCB over time Try to solder fast Heatin...

Page 12: ...leg 3 Wait a moment Then remove the iron 4 Do not move the part you just soldered for a few seconds while it is cooling down Moving it may cause the solder joint to crack With lead solder the solder j...

Page 13: ...above the solder joint The resistance value is given with colored bands on the resistor The code consists of four five or six bands With four bands the first two are the base value see table below the...

Page 14: ...itors Capacitors are soldered the same way as resistors Electrolytic capacitors are polar They must be mounted in the correct orientation They will be destroyed when installed in reverse polarity and...

Page 15: ...the letter n is the capacitance in nF where 3n9 is 3 9nF Upper case characters denote the tolerance according to this table B C D F G H 0 1pF 0 25pF 0 5pF 1 2 2 5 J K M S Z P 5 10 20 50 20 80 20 0 10...

Page 16: ...e symbol The positive terminal is called the anode Diodes are mounted horizontal Try not to heat up the body of the diode while soldering 4 LEDs LEDs light emitting diodes must be soldered with respec...

Page 17: ...The mark on the silkscreen must match the notch on top of the IC Pin numbers are counted counter clockwise starting from the notch Note Please also pay attention to the ESD warnings at the beginning...

Page 18: ...n the silkscreen drawing The leads may not cross Note field effect transistors FETs are extremely sensitive to ESD 7 Crystal The polarity of the crystal is not relevant but the bottom side of the pack...

Page 19: ...le below the third is the multiplier to the base value and the fourth is the tolerance The inductor value is base value multiplier tolerance Color Codes Color Digit Multiplier Tolerance in None 20 Sil...

Page 20: ...ning 10 Crystal oscillator Unlike crystals oscillators are polar Pin 1 is identified by the pointy edge The other edges are rounded If the oscillator is mounted incorrectly it will cause a short that...

Page 21: ...itor labeling such as n10 0 10 nF 100 pF as opposed to 10 nF Also check if all leads of an IC are correctly inserted into the socket They tend to bend during insertion After soldering inspect the boar...

Page 22: ...it to fix errors which takes extra time and effort See the previous page for more information 2 Solder the parts with an asterisk the LCD both Alps potentiometers the BNC and USB connectors and the t...

Page 23: ...Finished Component Side Finished Solder Side without the LCD LCD Mounting 16...

Page 24: ...offset 1 Set the output amplitude potentiometer to minimum 2 Set the DC offset potentiometer in mid position 3 Adjust P3 until the output signal is exactly 0V Square Wave Amplitude 1 Set up the device...

Page 25: ...t match the bar on the silkscreen symbol Verify the polarity of the electrolytic capacitors Keep in mind that the marking on the capacitor can point to the or lead The actual meaning is printed inside...

Page 26: ...ld the PCB toward bright light Are there bad cold dry solder joints Jiggle component leads at the solder joint with a pair of tweezers Re solder them if any move If a solder joint looks suspicious bet...

Page 27: ...pply that meets this criteria can be used Warning An AC power supply may not be used Note It is advisable to use a current limiting lab power supply when switching on for the first time Set it to 15V...

Page 28: ...caps on the tact switches 2 Join the front panel and the PCB and insert both in the respective brackets The PCB fits in the brackets behind the front panel 3 Install and lightly tighten the lock nut...

Page 29: ...t sink and C11 5 Solder four pieces of wire about 15cm 6 long to the two Cinch connectors and their ground leads 6 Put the connector s wires through the appropriate holes in the back plate 7 Attach th...

Page 30: ...Operation Menu Structure 23...

Page 31: ...sine SIN triangle TRI or square wave SQR appears in front of the selected waveform Press FUNCTION Enter to apply the selected waveform or MENU Back to cancel Amplitude The amplitude is adjusted with...

Page 32: ...enu item or increase decrease an item s value and moves the cursor in numerical entry menus or selects the active item in selection menus The selected item is shown with the symbol Press FUNCTION Ente...

Page 33: ...on parameters 2 1 MOD TYPE Modulation type can be FSK frequency or PSK phase 2 2 FSK FREQ Here you can select the frequency step used to change the frequency when using FSK Example output frequency is...

Page 34: ...o stop the modulation and return to normal operation 3 SWEEP In sweep mode the output frequency is continuously changed from the start to the stop frequency with the duration derived from the frequenc...

Page 35: ...lower frequency 3 3 SWEEP FREQ The sweep frequency can be adjusted between 0 1 Hz equivalent to 10 sec sweep cycle duration and 10 Hz 0 1 sec sweep cycle duration or 10 sweep cycles per second 3 4 SW...

Page 36: ...e 4 PLL Reference If the AE20125 is used as the timebase for a PLL the frequency of the PLL can be calculated and shown directly on the display The indicated frequency is calculated as follows f PLL f...

Page 37: ...en Select a position 1 5 to save the preset and press FUNCTION Enter The settings are saved To load a preset select LOAD SETTINGS and the appropriate position in the load menu Press FUNCTION Enter to...

Page 38: ...ote The calibration should be carried out after the unit has reached operating temperature 30 min 7 Firmware Update To update the firmware hold MENU Back while switching the generator on FIRMWARE UPDA...

Page 39: ...10 000 0 Hz Output Waveform Preset 1 5 SINE Calibration Offset 0 PLL Factor 1 PLL Offset 0 Hz PLL Enabled OFF Sweep Start Frequency 10 000 0 Hz Sweep Stop Frequency 100 000 0 Hz Sweep Mode LOOP Sweep...

Page 40: ...Circuit Diagram Part 1 2 33...

Page 41: ...Part 2 2 34...

Page 42: ...C16 C20 10 F Electrolytic 1 C12 680 F Electrolytic 2 C19 C30 1 F Film 2 C1 C29 22pF 1 D1 1N4007 Diode 5 D2 D3 D4 D5 D6 1N4149 Diode 3 FB1 FB2 FB3 Ferrite bead 3 L1 L2 L3 10 H 1 K1 Relay 2 MOD SYNC Cin...

Page 43: ...1K 1 IC1 IC Socket 28 pin Microcontroller 1 IC2 AD9833 DDS Waveform Generator pre assembled 1 IC3 LM6181 Op Amp 1 IC4 7805 Positive Linear Regulator 1 IC5 79L05 Negative Linear Regulator 1 OUT BNC Co...

Page 44: ...USB USB Type A Connector Other PCB 4 spacer bolts and 8 M2 5 screws for LCD mounting Heatsink for IC4 with M4 screw and nut Case and 6 extension caps for the tact switches optional AC adapter optiona...

Page 45: ...e designators contains an asterisk are mounted on the opposite side of the PCB See the chapter Assembly for details Note To help locate the right elements parts and their respective designators are hi...

Page 46: ...tes a virtual serial COM port This makes integration with external tools and applications very easy System Requirements USB Interface MS Windows 1 98 ME 2000 XP Vista 7 8 Server 2003 Server 2008 Serve...

Page 47: ...by going to Control Panel Device Manager and selecting the port Select Properties Port Settings Advanced and assign a new number It will remain even after the device is disconnected and connected agai...

Page 48: ...ng a USB A A cable 2 Launch the software 3 Select the correspondent serial port from the list and click Open If the connection was successful Connected to instrument will be displayed The software off...

Page 49: ...Step 0 1 Hz over the whole range Accuracy 50ppm calibratable Max Amplitude 5Vpp1 DC Offset 10V 5V to 5V Output Impedance 50 Display 2x16 characters dot matrix LCD PC Interface USB optional Supply Vol...

Page 50: ...MAX 3599 P Modulation Source 0 Internal 1 External Q Internal Modulation Frequency in 0 1 Hz Min 1 MAX 10000 R Sweep Mode 0 LOOP 1 SWING S reserved T Get Settings Data ignored U Keep Alive Data ignore...

Page 51: ......

Page 52: ...ASCEL ELECTRONIC www ascel electronic de 2015...

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