Products > Test Equipment
JunTek PSG9080 Programmable Signal Generator (80 MHz - 300 MSa/s - 14-bit)
XeRoX:
Hello!! My question about noise is not correct and actual more. I just used oscilloscope incorrectly. I connect generator out both to osc and op amp input. Then I try to get signals from generator and from op amp input synchronously I just connect offset amp output to GND by generator and oscilloscope cabels :-[ Sorry for incorrect question.... Also I already have checked and working chassis of power supply 5V / 3A with linear stabilizer) I'm not sure that I need in such construstion in generator right now ......
radiolistener:
--- Quote from: XeRoX on January 30, 2021, 10:06:09 am ---I'm not sure that I need in such construstion in generator right now ......
--- End quote ---
if you want to put external voltage offset, you're needs to remove DC offset of generator.
Otherwise you can burn out generator with external voltage.
It means you're needs to connect output through some capacitor or transformer or use some buffer amplifier.
DROBNJAK:
--- Quote from: radiolistener on September 16, 2020, 09:59:18 am ---
--- Quote from: TheDefpom on September 16, 2020, 09:26:00 am ---I also really like the frequency fine tune in the menu which lets you adjust its output frequency to be more m from factory it is at 50% adjustment, I adjusted mine to 58% to get it almost bang on frequency, unfortunately though this adjustment doesn't have an effect on the frequency counter input, that seems to be a seperate reference (or is not software tied to the fine tuning).
--- End quote ---
yes, I also notice that frequency fine tune doesn't affect frequency meter.
Here is actual frequency output on my unit for 50 MHz setting and different frequency fine tuning value:
- 49.999713 MHz for setting 49
- 49.999765 MHz for setting 50 (default)
- 49.999817 MHz for setting 51
- 49.999869 MHz for setting 52
- 49.999921 MHz for setting 53
- 49.999973 MHz for setting 54
- 50.000026 MHz for setting 55
- 50.000078 MHz for setting 56
About 52 Hz per unit. 52*50 = ±2600 Hz tune range.
I think it's too high for usual TCXO, it will be better to have about 5 Hz per unit.
--- End quote ---
I have an application where I need the accuracy of 1 Hz or better at around 60-70 MHz.
Can you please tell me if you can achieve such accuracy with PSG9080 sig-gen?
What kind of signal generator can guarantee such high accuracy?
mawyatt:
Doubt the PSG9080 or most lower cost AWGs can achieve that level of accuracy. Likely require an external reference like a GPS reference for use with the AWGs that have an external reference (10MHz) input.
Think most of the mid-level AWGs from Siglent and Rigol will work with an external GPS reference, I know our SDG2042X works with 10MHz external references although we don't have a specific GPS reference. The higher end AWGs from KS and Tektronix should also work with an external GPS reference.
Best,
DROBNJAK:
--- Quote from: mawyatt on February 19, 2021, 05:14:00 pm ---Doubt the PSG9080 or most lower cost AWGs can achieve that level of accuracy. Likely require an external reference like a GPS reference for use with the AWGs that have an external reference (10MHz) input.
Think most of the mid-level AWGs from Siglent and Rigol will work with an external GPS reference, I know our SDG2042X works with 10MHz external references although we don't have a specific GPS reference. The higher end AWGs from KS and Tektronix should also work with an external GPS reference.
Best,
--- End quote ---
Thanks for the tip. I didn't know that GPS reference is so good. That can save me some money.
On another note, in Rigol's DSG800 1.5 GHz spec sheet is says, pg.2 section: "Internal Reference Frequency", that it can deliver "< 5 ppb" frequency accuracy. That's 5 parts-per-billion which I find astonishing. Its just pitty it is out of my price range.
Is < 5 ppb frequency accuracy really common in that price range of AWGs?
https://www.rigol-uk.co.uk/jg/wp-content/uploads/2020/06/Rigol-DSG800-Datasheet.pdf
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