Tektronix Applications Expert

The instrument resistance is spec'd at ~30ppm of range after 24 hours, ~40ppm of range after 1 year, on the minimum resistance range of 100 ohms, that is a 3-4 milliohm accuracy or uncertainty. This could be + or -.

However, that range uses a 1mA test current, which means the voltage of a 3 milliohm resistance would be 3uV. Any EMI or even just external electric fields, static electricity, or additional junction voltages from other sources will easily affect this measurement.

You could provide shielding around the test leads which is connected to the instrument chassis (isolated from the test leads) and this may reduce EMI susceptibility.

A different instrument which uses a higher source current will raise the measured voltage higher, bringing it above any small voltage error contributors, and thus above the "mud".

Our DMM6500 instrument uses a 10mA test current on the 1Ohm range, which brings the voltage level up 10x compared to the model 2000 DMM. However, it may still be susceptible to voltage error contributors if high enough.

We have many customers measuring milliohms or even microohms with a Source Measure Unit (SMU) like the 2450. With that instrument, you could source 100mA or even 1A and measure voltage levels high enough to be well above noise/error levels.

Hello,
The 3792-KIT104-R is obsolete. There is not a replacement part. I recommend looking to see if Mouser, Digikey, etc… have available stock

Hello,
Yes. The Model 3720 uses two 78-pin male D-sub connectors for signal connections. For screw terminal or automatic CJC, use the detachable Model 3720-ST accessory.

I recommend the 2651A

There was a question posted on Tektronix web site in regards to The pulse capability of the 2281s power supply can be found in the datasheet: https://www.tek.com/en/datasheet/2281s-datasheet

On page 6 you will find the the pulse specification for the 2281S.

Hello, based on the information provided we recommend you send the unit in to be serviced.

To set up a repair RMA (model and serial number)
call 1-800-833-9200 opt 2.
Or send an email to rmarequest@tektronix.com
https://www.tek.com/en/services/repair/mytek_rma_request

Hello,

Unfortunately, there is not a replacement for this part, but it looks like we might have one in stock. You can contact the Sales team to see if this part is available for purchase. To contact our Sales team, email buy@tektronix.com or call 1-800-833-9200 option 1. Unfortunately if this is out of stock, or if we are unable to sell you this part, I do not have any suggestions for a commercial bnc jack.

The Keithley model 2100/120 6.5 digit DMM is not upgradeable to 220/240 power line voltages. This is because 220/240 is for Europe and other nations using that line voltage and there are no upgrade options. However, those other units can be purchased. Please refer to the link below to the data sheet for this family of product for more detailed information:

https://www.tek.com/en/manual/keithley-model-2100-6-1-2-digit-resolution-digital-multimeter-calibration-manual

I'm not a LabVIEW expert but I'm well practiced with the MSO4104 commands.

If you aren't getting back all the data you expect, the first thing I would check is the DATA:STOP setting. Both DATA:START and DATA:STOP values influence how many samples are returned during a CURVE? query.

I typically use Python. I demonstrate a robust order of operations with this example https://github.com/tektronix/Programmatic-Control-Examples/blob/master/Examples/Oscilloscopes/MidrangeScopes/src/SimplePlotExample/mdo_simple_plot.py. Curve setup starts on line 44.

Hello,

For all specifications, I recommend reviewing the datasheet:
https://www.tek.com/en/datasheet/2470-graphical-sourcemeter-smu-instrument-datasheet

This will provide ranges and accuracy specifications for each source and measure function. The maximum reported source range is 1000V.
However, most of our sourcing instruments provide an overrange value, in this case 1100V.
A chart can be found in the instrument's reference manual to provide maximum signal levels by range on page 4-41:
https://www.tek.com/en/keithley-source-measure-units/keithley-smu-2400-series-sourcemeter-manual/model-2470-high-voltage-1

Model 2470 was designed to replace the Model 2410, but is not a drop-in replacement for all features. Do note though, that a similar source isolation relay was used in the Model 2470 as is used in the Model 2410.