Tektronix and Keithley

print(display.lightstate) always returns display.STATE_LCD_OFF after power-up

At the same time, the device screen is turned on.
This variable starts to work normally only after writing any value to it.

Different numbers of decimal places depending on the selected screen or the value of a number.

In the settings, select 7.5 digits instead of the default 3.5.
Kilo degrees is a feature of the firmware

Schedule deviation of time from the expected. Ideally, each sample should be in the time position t = i * T0. The graph shows the difference between the time given by the device and the ideal delta t = t - i * Т0
Graph for frequency 1 MHz; count=6 000 000

I described my understanding of how this works here: https://www.eevblog.com/forum/testgear/all-about-keithley-dmm7510-bugs-and-features-recipes-advice-notes/msg3013456/#msg3013456 The only thing that remains unclear is whether we can manually set the fractional aperture. It seems to me yes, but it ...

They really should be different.

I understood ...
For a frequency of 400 kHz:
2 μs: we get an averaging of 2 samples with a period of 1 μs.
auto: we get an averaging of 2 samples with a period of 1.25 μs.

A little later I will try to describe how these numbers are calculated ...

Andrea C wrote: ↑

April 12th, 2020, 11:13 am

Yes, that is my understanding.

Does this mean that when I set the Aperture parameter to 2 μs and Auto, should I see the same waveforms?

(rounded down to the nearest integer).

400 kHz Aperture Auto

Aperture = 2 μs?

YES? NO?

What is the aperture value in microseconds for the sampling frequency of 400 kHz and the value of the Auto parameter?

Write one number.

I am learning to use the device. And for this I wanted to understand how the dmm.APERTURE_AUTO parameter works. For a frequency of 400 kHz (period of 2.5 μs) I can set 3 values ​​for aperture parameter 1,2, and Auto. With a value of 1, the aperture is 1 μs. With a value of 2, the aperture is 2 μs. W...

Many thanks!

This forum is almost dead. I invite you to a more lively place.

https://www.eevblog.com/forum/testgear/ ... ice-notes/

I was trying to figure out how to control the aperture for DigiV. To do this, I applied a rectangular signal with a frequency of 400 kHz from the generator (high level [2.5V] 90% of the time; low level [-2.5V] 10%). And he turned on the digitization with the same frequency of 400 kHz. (frequencies a...

The digitize 100V range behaves very strangely. For example, I see a reaction from a change in input resistance. Short input noise: At 10 MΩ - 750 μV At Auto - 65 μV Input band: At 10 MΩ - 17.5 kHz At Auto - 7.5 kHz Is there any difference between 10 MΩ and Auto? If you select a range of 1000V there...

New firmware 1.7.0. Trying to write a large contiguous buffer (8 000 000 samples) at a time: Settings: Digi V + [Freq=1MHz] + [Aperture=1mks] + [count = 8,000,000] img1129_091159.png When time-critical processes are not implemented on the hardware, but are given to programmers, it’s a disaster :( Wh...

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For calibration comparisons if you do not own a proper manufactured short plug, any comparisons using DIY toys they are not considered as valid. But you can not be blamed when TEK it self, does not offer pricing and product information for their own 4X short plug, there is no photograph of it anywh...

The maximum size that can be obtained after the appearance of the bug is only 7997000.

UPD: To repeat the bug for the newly turned-on device, you need to repeat the script twice. But between operations you need to disconnect from the device and reconnect. The red arrow indicates the location of the reconnection.

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