Products > Test Equipment
All about Keithley DMM7510. Bugs and features, recipes, advice, notes.
MegaVolt:
Analog
Relay
* Secondary measurement without relay clicks - https://www.eevblog.com/forum/testgear/all-about-keithley-dmm7510-bugs-and-features-recipes-advice-notes/msg2180195/#msg2180195
* Additional information about the relay - https://www.eevblog.com/forum/testgear/new-keithley-dmm6500/msg2022019/#msg2022019
DCV
* An input of 10 MΩ in the range of 0.1 V and 1 V creates an offset voltage of 5-6 μV and additional noise. Do not use this input impedance for accurate measurement. No solution. - https://forum.tek.com/viewtopic.php?f=363&t=141241
DCI
* Measuring current from sources with low internal resistance gives a big error. - https://forum.tek.com/viewtopic.php?f=363&t=141262
Digi V
* The input frequency band does not depend on the sampling frequency :( and depends only on the range. - https://www.eevblog.com/forum/testgear/all-about-keithley-dmm7510-bugs-and-features-recipes-advice-notes/msg2710538/#msg2710538
* At high digitizing speeds (> 200kSps), noise in the 0.1V range is very different from white noise. No solution. - https://www.eevblog.com/forum/testgear/all-about-keithley-dmm7510-bugs-and-features-recipes-advice-notes/msg2609100/#msg2609100
Temperature
* Does not support measurements for Pt1000. No solution.
* When measured from a thermocouple, it does not measure the temperature of the cold junction. Solution - https://www.eevblog.com/forum/testgear/all-about-keithley-dmm7510-bugs-and-features-recipes-advice-notes/msg2233422/#msg2233422
Digital
Digi V; Digi A
* Parameter dmm.APERTURE_AUTO does not work as described in the documentation. https://www.eevblog.com/forum/testgear/all-about-keithley-dmm7510-bugs-and-features-recipes-advice-notes/msg2648655/#msg2648655
* The position of each sample on the timeline has a virtual error due to the transfer of the internal timeline to the external. https://www.eevblog.com/forum/testgear/new-keithley-dmm6500/msg2140273/#msg2140273
Programming
* Low data reading speed via remote interface (v1.7.0). I could not get more than 800 KB/s (<7% 100MB Ethernet). This is about 50 KS/s (8 bytes of data and 8 bytes of time for 1 count). The processor inside the device allows you to work at higher speeds. No solution.
* The warm-up status on the remote interface can only be known once. The program launched the second time will not be able to get this status. No solution. - https://forum.tek.com/viewtopic.php?f=363&t=138795
* NTFS flash drive is not supported, only FAT32 works. No solution. - https://forum.tek.com/viewtopic.php?f=363&t=140287
Firmware bug`s fix history
1.7.0
Improved remote control of the device:
1. Data reading speed increased 3 times to 60 KSamples per second. (When reading a large buffer, the reading speed at the beginning is greater than the reading speed at the end. My error.)
2. Reading data digitized at high speeds (1 MHz) is performed without a preliminary long delay.
3. Virtal front panel works much better. If you return to the device using the http://IP_Device/front_panel.html link, you can open a window without a menu. It looks great on a smartphone :)))
Other:
4. The measurement block (trigger.BLOCK_MEASURE_DIGITIZE) now has the same name for the Measure and Digitize modes. (Just as it is done in the DMM6500).
5. The labels on the vertical axis on the graphs have become much better readable.
New bugs:
DigiV writes a large buffer with a pause in the middle. - https://forum.tek.com/viewtopic.php?f=363&t=142031
1.6.7
Link`s
https://www.eevblog.com/forum/blog/eevblog-731-keithley-dmm7510-7-5-digit-multimeter-teardown/
https://www.eevblog.com/forum/testgear/keithley-dmm7510-7-5-digit-multimeter-review-teardown-experiments/
https://www.eevblog.com/forum/testgear/7-5-digit-bench-dmms-comparison/
https://www.eevblog.com/forum/testgear/keithley-dmm7510-smu-2450-2460-problems/
https://imgur.com/gallery/Wbx7q
MegaVolt:
Brad O I will be very grateful for the answers about 7510.
1. DataSheet promises 140,000 measurements per second via LAN (measurement + time). So far I was able to get a maximum of 15,000. What can I configure to get the reading speed stated in the datasheet? Binary mode is on.
2. How can you remotely know if the warm_up period has passed or not? Is there any flag or status for this?
3. I managed to get the error of measuring time beyond 20ns during the first 2s :( It seems to me that these outliers occur at random times and are not related to the first 2s. I also saw peak to peak emissions on the order of 900ns on a sample of 8MS.
4. How can I reset the device without turning off the power? I notice that if the device stopped working as needed (does not respond via the network or something strange responds), then you can fix it only by turning off the power. It is very uncomfortable. We must wait again for an hour and a half. Resetting from the touchscreen does not help: (
MegaVolt:
I see a clear periodicity. Every 5s is a new failed time.
Does this mean that data is selected at the wrong moment in time? Or is it a timeline problem and you can ignore them?
MegaVolt:
Current and voltage measurement without relay clicks. This is possible if you select secondary measures in accordance with the tables below:
MegaVolt:
When measured from a thermocouple, it does not measure the temperature of the cold junction. See the first picture.
A possible solution to this problem is indicated in the second picture.
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