Tektronix and Keithley

For calibration comparisons if you do not own a proper manufactured short plug, any comparisons using DIY toys they are not considered as valid. This is a great way to protect yourself from questions. Well, my short circuit is bad. Let's close the inputs with the test leads that come with DMM. Hope...

JudgeBeeb wrote: ↑

January 18th, 2019, 4:03 pm

Did you ever find a solution for this?

This is a very rare event. I came across him twice. And it seems I learned to walk the paths where it does not occur.

I could not find the conditions in which it repeats and Keithley can not fix it

After talking with the engineers, Keithley within email revealed the following: The device retains its accuracy only if the input impedance AUTO mode is set. Accuracy in 10 MΩ mode is not verified and is not guaranteed. One of the engineers suggested using relative measurements to zero the offset ma...

Check out footnote 4 on the DC Voltage spec. Here is this note?: "4. When properly zeroed using the Rel function with external cables." I considered this note to refer to the cable. That is, I have to take care of the compensation of thermal EMF cable. I was wrong? But it turns out I should take ca...

Measure the current with open inputs: 10µA range - 1.4 pA 100uA range - 24 pA 1 mA range - 127 pA range 10 mA - 647 pA These are excellent numbers around 0.1 ... 0.2ppm Measure the current with shorted inputs: 10µA range - 33nA (3300ppm !!!) 100 uA range - 330nA (3300ppm !!!) 1mA range - 3.3mkA (330...

In the measure settings, what is the state of Line Sync? It is off by default. Try turning it on, if these spikes are problematic to your use case for the instrument. Yes, the inclusion of this option solves the problem when NFC = 1. This is in my opinion a way to hide the problem. Although the pre...

The USB drive file system needs to be FAT32 formatted. Please reformat the drive and retest for compatibility. The lack of support for NTFS in my opinion is not very convenient. I have to keep a separate USB flash drive with FAT to work with the device. This flash drive works great with other devic...

Range 0,1V offset 6 µV = 60ppm. Specifcation only 6ppm. This is 10 times worse than the specification. Range 1V offset 6 µV = 6ppm. Specifcation 4ppm. This is 1,5 times worse than the specification. The inputs of the device are shorted. It seems to me that the bias voltage exceeds that described in ...

In Firmware v1.6.7c emissions on the 100V range are gone !!! But they appeared on the ranges of 0.1V - 10V with the input connectors open and the input resistance 10MΩ. Emissions go exactly 160 measurements. I would venture to suggest that the problem is in synchronization with the frequency 50Hz. W...

Yes, reading the buffer is slow. We are investigating what optimizations that we need to make on the instrument and in the software to improve this issue. I will also capture this as a defect issue. Thank you :) Glad to hear me. Can I call your specialist to the topic on the 7510 device itself. Oth...

My usb 3.0 Transcend JetFlash 760 TS32GJF760 32 Гб stick is also not recognized.

File system NTFS.

Hi Jennifer, I am very glad that you responded. I have already started to think that the forum is dead: ( Is it possible that you can reduce your sample count? For example, can you try 3 million readings? Thank! It works like this :) Can you share a bit more about your application? I wanted to see t...

I chose Digitize voltage and tried to set the maximum buffer size. It will receive many errors with descriptions of the maximum allowed buffer size. Attempts to set the correct buffer size led to subsequent errors and a suggestion to reduce the buffer. See the video for details. https://www.youtube....

Data:

Discovered curious spikes for a range of 100 V and NPLC = 1 and NPLC = 0,1. Other NPLCs look pretty ordinary.

The file with the data is attached.

Emissions are not large and fit into the instrument specification. But they look like some kind of problem May be software.

FW 1.6.4

This voltage jumps when the input resistance changes on the ranges of 0.1V and 1V at 1NPLC

Moreover, for a range of 0.1V, the jump is 6 µV or 60 ppm.

AutoZero can be in any condition.

The input is shorted.

DMM connect from LAN (DHCP)

See video.

https://www.youtube.com/embed/Rvf8-_G8208

See attachment.