Thank you all for the well-wishes, worthy of note is that of the test equipment I kept the PCSU1000 and PCGU1000 were always at the top of the “keep” list. I find the bode plotting function to be very useful, and even fun.
I also kept a few other signal sources, scopes and other stuff. I also have a bunch of “boat anchors” under the bench so when I feel up to it I go out and see what I can fix today…
I am sorry to hear what has happened to you Cliff.
You are indeed an asset to this forums board participating intensively the discussions in this forum for many years.
All your suggestions and comments have been very helpful and valuable for us to develop the products even better.
Glad to see you are back.
[quote=“lazzy”]the Ext channel could be plotted in the same way as the other 2 channels, allowing for the trigger point shown in the Ext channel plot to correctly reflect the activation of the signal source; in any case, all three channels should be saved as DSO text data (in the same way the other 2 ch’s are already saved) for further processing.[/quote] I’m sorry this is not possible. There in the Ext channel input is only a voltage comparator to detect when the input signal crosses the adjustable trigger level voltage. The trigger level is adjustable about between -0.3V and 3.5V.
There is no data saved from the Ext channel input.
You may do some tests with the Ext trigger:
On 2V/Div range the Ext trigger level mark on the left side of the screen corresponds about the displayed waveform.
You can test this by feeding a triangle or ramp waveform both to the Ch1 (or Ch2) and to the Ext trigger input.
In this case the Ext triggering occurs about at -0.3V
In this case the Ext triggering occurs about at 3.5V
VEL 255
Thanks for your reply and advice.
I would need to clarify this: when using the Ext channel, the trigger point corresponds to the crossing of the threshold level of the Ext channel or of the Ch1/Ch2 channels?
Sorry for all the bothering with this issue, but I am trying to make the best use of a very well designed device for a rather unfamiliar application.
and (when using the Ext channel),
the adjustment of the trigger level corresponds to the Ext channel?
tx
lazzy
How can I upload a few images into a post?
Please provide links to the pics.
[quote=“lazzy”]and (when using the Ext channel),
the adjustment of the trigger level corresponds to the Ext channel?
tx
lazzy[/quote]
Yes, the trigger level adjustment is distinct to each possible trigger source.
The external trigger input looks like this:
As you can see it is much less complex than either test signal input, with just a single voltage range. The FPGA provides the comparator with an analog reference voltage that is the “trigger level”–when the trigger signal crosses above or below that reference the comparator’s output toggles, signalling the FPGA that a trigger event has occurred.
Posting pictures requires that you have them stored on a publicly accessible host, if you like you can email them to me and I can host them on my server–cliffyk@paladinmicro.com
[quote]and (when using the Ext channel),
the adjustment of the trigger level corresponds to the Ext channel?[/quote]Yes.
The adjusted trigger level must be about between 0V and 3.5V.
If adjusted outside this range, no triggering occurs.
Best solution is to keep the trigger level slider in the middle position or a little above the middle.
In this screenshot the proper working range of the slider is shown with the red line:
[quote]I would need to clarify this: when using the Ext channel, the trigger point corresponds to the crossing of the threshold level of the Ext channel or of the Ch1/Ch2 channels?[/quote]This is very strange behavior indeed.
Is it possible there is some crosstalk between the Ch1/Ch2 and Ext input signals?
Does it help if you adjust a little the trigger level of the Ext channel?
