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by Ilya Grudovik
June 13th, 2020, 8:54 am
Forum: DMM7510 Graphical Sampling DMM
Topic: print(display.lightstate) always returns display.STATE_LCD_OFF after power-up
Replies: 0
Views: 84

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

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.
by Ilya Grudovik
May 16th, 2020, 2:32 pm
Forum: DMM7510 Graphical Sampling DMM
Topic: Temp reading (thermistor) breaks with 1.7.0e
Replies: 4
Views: 140

Re: Temp reading (thermistor) breaks with 1.7.0e

In the settings, select 7.5 digits instead of the default 3.5.
Kilo degrees is a feature of the firmware :(
by Ilya Grudovik
April 29th, 2020, 4:51 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Uneven readings in Digitizing mode.
Replies: 0
Views: 159

Uneven readings in Digitizing mode.

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
by Ilya Grudovik
April 13th, 2020, 5:00 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.
Replies: 10
Views: 259

Re: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.

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 ...
by Ilya Grudovik
April 12th, 2020, 3:34 pm
Forum: DMM7510 Graphical Sampling DMM
Topic: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.
Replies: 10
Views: 259

Re: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.

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 ...
by Ilya Grudovik
April 12th, 2020, 11:55 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.
Replies: 10
Views: 259

Re: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.

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?
by Ilya Grudovik
April 12th, 2020, 10:20 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.
Replies: 10
Views: 259

Re: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.

(rounded down to the nearest integer).
400 kHz Aperture Auto

Aperture = 2 μs?

YES? NO?
by Ilya Grudovik
April 12th, 2020, 7:21 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.
Replies: 10
Views: 259

Re: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.

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

Write one number.
by Ilya Grudovik
April 11th, 2020, 12:10 pm
Forum: DMM7510 Graphical Sampling DMM
Topic: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.
Replies: 10
Views: 259

Re: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.

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...
by Ilya Grudovik
April 9th, 2020, 6:36 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Parameter dmm.APERTURE_AUTO does not work as described in the documentation.
Replies: 10
Views: 259

Parameter dmm.APERTURE_AUTO does not work as described in the documentation.

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...
by Ilya Grudovik
April 9th, 2020, 5:58 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Parameter dmm.digitize.inputimpedance does not work as described in the documentation in 100V range.
Replies: 0
Views: 117

Parameter dmm.digitize.inputimpedance does not work as described in the documentation in 100V range.

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...
by Ilya Grudovik
November 29th, 2019, 2:21 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Pauses when recording a large buffer in Digi V mode
Replies: 0
Views: 211

Pauses when recording a large buffer in Digi V mode

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...
by Ilya Grudovik
August 12th, 2019, 4:21 am
Forum: DMM7510 Graphical Sampling DMM
Topic: DigiV noise
Replies: 0
Views: 723

DigiV noise

See -:
by Ilya Grudovik
May 20th, 2019, 6:25 am
Forum: DMM7510 Graphical Sampling DMM
Topic: Strange readings when measuring current.
Replies: 4
Views: 5795

Re: Strange readings when measuring current.

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...
by Ilya Grudovik
May 1st, 2019, 3:24 pm
Forum: DMM7510 Graphical Sampling DMM
Topic: The problem of changing the size of the buffer.
Replies: 2
Views: 3070

Re: The problem of changing the size of the buffer.

The maximum size that can be obtained after the appearance of the bug is only 7997000.
by Ilya Grudovik
May 1st, 2019, 3:03 pm
Forum: DMM7510 Graphical Sampling DMM
Topic: The problem of changing the size of the buffer.
Replies: 2
Views: 3070

Re: The problem of changing the size of the buffer.

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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