I posted a screen capture of the 312V p-p mains leakage to the Ground pin of the PSU that came with the JDS6600 in the last post.
The images for problems at low signal levels is given in the two attached photographs.
The signal generated by the JDS6600 is set at 30mV, 1kHz
One picture is a screen capture of the scope itself. One picture is of the JDS6600 showing the settings.
Kind regards,
Trys
Hi Trys
thank you for your reply
you did not use our own AC-DC power supply ?
from the picture, it should be power supply interferece , and there are some inerference in your working place
please check and use our own power supply
Hi,
Yes it is your power supply that was supplied with the unit.
I will also try to reduce environmental noise, as I suspect that may also be adding to the problem.
The Function Generator is very good at higher amplitudes, it works very well and I find the controls easy to understand and use.
Trys
Forgive me for being thick, but I thought it did have a frequency counter via "Ext In"?
Hold on a little minute.
(Neck emerges from under its shell)
I've taken two photos of the screen (see below). Is the "Function Counter" the thing you are after then?
Trys
Here we go, I've tested it for you.
I put the scope's probe 1Khz compensation calibration squarewave to the "Ext In" of the JDS6600 and tried both the "counter" and the "measure". One counts pulses over time (you can stop/pause, start and clear it), and the other measures the frequency.
(Shots below).
Trys
Just a follow-up on my previous posts.
I've been using the JDS6600 DDS Arbitrary Function Generator for a few weeks now.
Now I've had more time to use it, I'm really delighted with it. Most recently I've been using it at low signal levels (at around the 20mV) looking at emitter-follower characteristics, and I can't fault it at all.
OK, so I built my own little earth grounded 5v linear power supply to feed it, but that's why I bought this version rather than the other types that are directly mains powered in the first place, as I felt I would get a clean signal like that.
The controls are easy to use, it's intuitive, and the display is really helpful as it shows the shape of the waveform that it's producing on Channel 1. The buttons themselves feel quite tactile, and very similar to the ones on my scope. They're slightly rubberized and you know you've pressed them.
The unit can be set up to start up in whatever mode you want when it first starts up too. This is really useful if you're doing a similar set of tests aver a number of sessions. So if for example, you can set the unit to start up with both channels turned off, and the first channel to be ready to output a triangle wave at 5MHz, with an amplitude of 20mV, and the second channel ready to output a sine wave of 1KHz and 1V. You can have channels default to be on or off on startup, whether you want the buttons to beep or not when pressed. That kind of thing.
The other neat thing is that it just so happens that the colours on Channel 1 and Channel 2 are yellow and light blue respectively, which just so happens to match my Rigol scope. I don't know if there is an industry standard for colour coding scopes and function generator channels or not. It makes things a lot easier trying to work out if what signal I'm looking at.
I've not tried loading up my own arbitrary waveform to the unit yet, and at the moment I can't think of why I would need to, but as it's got that functionality I may as well give it a try too at some point.
It's a very lightweight little unit, and so I've put one of those anti-slip mats under it to stop it moving around.
Here is a picture of mine, pumping out a triangle wave, 1KHz, at 30mV. The scope is on the collector of a 2N3904 set up as an emitter follower with a gain of ten. I've also got one of my other favourite things placed on top of the signal generator - a packet of Milliput.
I'm really happy with the unit. It's serving me very well.
Trys
RD Tech - You are most welcome. Thank you to your team for making such a great and useful device.
Mr Scram - here are details of the frequency and counter specs from the manual (see image below). It would be easy enough to make a little adjustable schmitt trigger for what you need.
Edited to add: Here is the part of RD Tech's youtube video showing the counter function of the device:
Thank you very much for your support , have a nice day
hope you like it and like our other products
Cheers,
Trys
The unit can be set up to start up in whatever mode you want when it first starts up too. This is really useful if you're doing a similar set of tests aver a number of sessions. So if for example, you can set the unit to start up with both channels turned off, and the first channel to be ready to output a triangle wave at 5MHz, with an amplitude of 20mV, and the second channel ready to output a sine wave of 1KHz and 1V. You can have channels default to be on or off on startup, whether you want the buttons to beep or not when pressed. That kind of thing.
The two exceptions are a) the power pack leaks 78 V AC measured from mains earth to the DC ground of the power pack. Leakage current is 14µA. Not life threatening and can be fixed by replacing it with a transformer based PS.