Weromstjoer items wurde oanfurden binnen 40 dagen as is de datum fan ûntfangst fan de guod. Oanpaste items kinne net werom wurde stjoerd of wiksele wurde. Items kocht mei in e-kado kaart binne allinich wikselber; weromstjoeringen binne net fan tapassing.
Frij Kado
Wolkom by Roymall, jo profesjonele webside foar it keapjen fan premium ôfdieling winkel kado's. Wy weardearje en wurdearje jo stipe, en wy wolle ús tankberens út troch in ekstra oanset fan opwining oan jo oankeapen ta te foegjen. As jo mei ús winkelje, krije jo net allinnich hege kwaliteit produkten dy't jo libbensstyl ferbetterje, mar jo sille ek in eksklusyf frij kado mei elke oardering dy't jo pleatse. Ree om ús kolleksje te ferkenjen en jo perfekte kado's te finen? Blêdzje troch ús seleksje fan premium ôfdieling winkel items, pleats jo oardering, en sjoch út nei de opwining fan jo frij kado dat mei jo oankeap arriveart.
Ferstjoer Belied
Wy sille hurd wurkje om items nei jo te besoargjen nei it ûntfangen fan jo oarders en soargje dat se feilich oankomme. Leveringsdetails sille wurde ferskate yn jo befêstiging e-mail.Yn de measte gefallen wurde oarders ferwurke binnen 2 dagen.Under spesjale omstannichheden sil it ferlet wurde as folget: As jo in oardering pleatse op sneon, snein of offisjele feestdagen, sil it ferlet wurde foar 2 dagen..Normaalwei hat it 5-7 wurkdagen (moandei oant freed) nedich sûnder te wurden beynfloede troch fleantúch fertraging of oare miljeu faktoaren..Om't ús ferstjoer tsjinst wrâldwiid is, sille de leveringstiden ôfhinklik wêze fan jo lokaasje, sadat it in pear kear nedich wêze kin en wachtsje as jo yn ôfhandige distrikten of lannen binne.
1. Weromstjoer & Wiksel Belied
Wy akseptearje allinich items kocht fan roymall.com. As jo keapje fan ús lokale distributers of oare detailhandelaren, kinne jo se net weromstjoere op ús side.Lêste ferkeap items of frije kado's binne net akseptabel foar in weromstjoer.Om yn oanmerking te kommen foar in weromstjoer, moat jo item ûnbrûkt wêze en yn deselde steat dat jo it ûntfongen hawwe. It moat ek yn de orizjinele ferpakking wêze.Nei it ûntfangen fan weromstjoer ynstruksjes fan ús, pakket jo weromstjoerde items yn en droech jo pakket ôf by it lokale postkantoar of in oare koerier. Wy sille jo weromstjoer of wiksel item ferwurkje binnen 3-5 wurkdagen nei't wy it ûntfange. De weromstjoering sil wurde ferwurke en automatysk kreditearre oan jo orizjinele betelmiddel.Gjin weromstjoeringen of wiksel kinne akseptearre wurde as it produkt oanpast waard produsearre, ynklusyf oanpaste maat, oanpaste kleur, of oanpaste printe.Mear help nedich, nim dan kontakt mei ús op. service@roymall.com of Whatsapp: +447549870296
2.Weromstjoer Belied
Jo krije in folsleine weromstjoering of 100% winkel kredyt nei't wy it weromstjoerde pakket ûntfange en it kontrolearje. De weromstjoering sil wurde ferwurke en automatysk kreditearre oan jo orizjinele betelmiddel.Tink derom dat ferstjoerkosten en eventuele rjochten of fergoedingen net weromstjoerd wurde kinne. De ekstra ferstjoerkosten binne net weromstjoerdber as it pakket al ferstjoerd is. Jo binne ferantwurdlik foar it beteljen fan dizze kosten en wy kinne se net ôfslachtigje of weromstjoere, sels as de oardering weromstjoerd wurdt nei ús. As wy jo weromstjoerde item ûntfongen hawwe en befêstige, stjoere wy jo in e-mail om jo te warskôgjen dat wy jo weromstjoerde item ûntfongen hawwe. Wy sille jo ek ynformearje oer de goedkarring of ôfkarring fan jo weromstjoering.As jo problemen hawwe mei it weromstjoer proses, nim dan kontakt mei ús op. service@roymall.com of Whatsapp: +447549870296
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Description:
FY3224S 24MHz Dual-channel Arbitrary Waveform DDS Function Signal Generator Sine Square Wave Sweep Counter
Features:
Output signal frequency high accuracy, good stability. Signal amplitude up to 20Vpp. Instrument can realize the adjustment program of function parameters , easy to use. Accompanying frequency meter, counter function, high cost. The instrument can output sine, square, triangle, ramp, pulse, staircase, DC voltage waveform. Pulse wave pulse width precision can be adjustable.
Function:
1. Using DDS direct digital synthesis technology to generate precise, stable, low distortion output signal. 2. CH1 and CH2 completely symmetrical two channels, each channel can be independently set the parameters. 3. Supports user-defined waveforms, each arbitrary waveform memory depth 2048 x 12bits, 250MSa / s sampling rate. 4. Has burst burst output, selectable manual trigger, internal and external trigger CH2 trigger three trigger modes that allow the unit to any output 1 - 1048575 bursts. 5. Measurement functions: instrument comes with 100MHz frequency counter functions and pulse counter functions. 6. Waveform generator up to 12 bits wide, the output waveform is more delicate, waveform distortion is reduced magnitude. 7. With full CNC functions, display and digital adjustment phase current amplitude of the output signal, offset, frequency, duty cycle, and the two signals. 8. After connecting the instrument to the computer, you can use the computer through the PC control signal generator functions and parameters, and can be edited on a computer to download arbitrary waveform output waveform to the instrument.
9. Communication: serial communication, protocol completely open, user-friendly secondary development. 10. High frequency accuracy: frequency accuracy up to 10-6 magnitude. 11. High frequency resolution: the full range of frequency resolution 10mHz. 12. Tracking function: built-in frequency, amplitude, offset, duty cycle, waveform and other parameters follow function, easy to use. 13. Scanning features: a frequency linear sweep and logarithmic sweep function, scan start and end points can be set. 14. Storage feature: You can store 20 groups instrument state parameters set by the user, can be called up to Reproduce 15. Operation: key operation, LCD1602 LCD display in English, direct digital setting parameters or continuous adjustment knob. 16. Input voltage protection: extended power input range AC85V to AC240V wide voltage. 17. Output short circuit protection: All signal outputs can operate at over load short circuit 60S.
Technical Parameters: Built-in switching power supply: AC85V-AC260V Interface: USB
Signal output: Output amplitude: ≥≥20Vp-p (no load) Output Impedance: 50Ω ± 10% DC polarization: ± 10V Frequency range: 0Hz - 24MHz (orther 0Hz - 6MHz)
Scan function: Scanning mode: Linear sweep, logarithm scanning Frequency Range: Start and end points set arbitrary Frequency scanning range: M1 - M2 predetermined frequency Scan rate: 1s ~ 999s / step
Other: Storage and transferred functions: M0 - M9 (M0: default) Size: 200mm (L) x 190mm(W) x 90mm(H) Beeper function: to set open or closed by the program Operating characteristics: All key operation, continuous adjustment knob Environmental conditions: Temperature 0 - 40 ℃ humidity <80%
Good news:
The unit is working. Controls is rather friendly and intuitive clear. FW ver.4.1. On the whole it conforms to the description.
Bad news:
- Bad packing, inappropriate for post delivery. The unit box looks as if elephants have danced on it.
- Mains cable is with crappy chinese plug, not European standard. No adaptor even included.
- Switching power supply is a total crap. You have to replace it with a classic linear one.
- Dangerous high voltage leakage from PS. The voltage between generator’s ground parts of all BNC and mains earth (or other laboratory equipment ) is 100VAC. You may easy get an electric shock and fry delicate equipment and microchips.
- Sin wave has glitches at the zero crossing point and half way long
- At 20VAC output waveforms are intact below 5MHz, at higher frequencies waveforms are significantly corrupted
- At 24MHz the amplitude significantly decreases
- You can get usable waveforms only below 5Mhz and below 10VAC of output
Conclusion:
A good generator for testing audio and some TV equipment, not suitable for ham radio.
I bought this unit to replace an earlier model. This model has remote facilities which I wanted to use for automatic testing.
These are the problems:
1) The upper frequency limit is 24MHz but you cannot set the frequency directly to more than 9.999999 using the <> buttons and the dial. You have to go to the units MHZ position and just keep turning and you will go over 10MHz. When you do this the 0.01KHz position disappears too. - see photos
2) Related to 1) the display software has a bug in it. If you program 10MHz the last digit (0.01KHz) disappears. You can still set the lowest digit but it does not show. Sometimes you also get the display 999.9999kHzz - clearly a problem. The good news is the actual output seems to be ok.
3) The included disk includes the Host Communication Protocol V1.2 document. Either this is an earlier document or it is incomplete. as:
a) There is no command to set the frequency above 9.99999999. The command size limit for the frequency is 9 characters which means you cannot enter 10MHz or more using the serial command.
b) The specification says that there is are four downloadable 2048 point waveforms. The serial specification does not include the protocol to do this. This is a feature I wanted for my project.
4) The included software is all in Chinese and is useless.
If you only want to use this unit standalone then it is excellent value for money. If you really need to drive this unit using the serial interface then the information is incomplete.