Jake A

Yes, Model 7078-TRX-1 is compatible and still available.
You can contact our purchasing team at buy@tektronix.com for a quote.

Hello,
We no longer provide CDs with software and other downloads.
All relevant documents and files related to the 2602A series SMUs can be found here:
https://www.tek.com/en/search?keywords=2602A
The most current control software is KickStart: https://www.tek.com/en/products/keithley/keithley-control-software-bench-instruments/kickstart
And you may also be interested in Test Script Builder: https://www.tek.com/en/keithley-test-script-builder

Many responses to support requests and technical questions can be found here in the TekTalk community forum.
Otherwise, you can create a case to receive contact from one of our engineers directly:
https://www.tek.com/en/support
However, the A-series models are obsolete and generally unsupported, having been replaced by the 26xxB series.
Our engineers will be able to provide limited support of questions related to the use of the 2602A.

Unfortunately, there isn't a manual for the KickStart software, currently.

 We have some helpful videos developed for KickStart on our support YouTube channel:

 https://www.youtube.com/user/TektronixSupport/search?query=kickstart

 Some of these videos are using older versions of KickStart, which will not show all enhancements currently included in this growing software solution, but will give you a good starting point.

Sample Rate in DC measurement on most instrumentation, including our DMMs, is governed by a multitude of settings (NPLC, filters, delays, etc), rather than a direct 'sample rate' parameter.

The DC functions prioritize accuracy and speed/rate are a secondary aspect.

Speed/rate will need to be optimized based on those accuracy-first parameters.

If you want the control of sample rate, primarily, I recommend using the Digitize function.

This will provide a direct sample rate field that you can utilize.

Digitize Voltage and Digitize Current prioritize the sample rate parameter.

Your understanding of fixture and electrometer guard are correct. This is more closely related to misunderstanding related to the settings/configuration of the instrument itself and how it is identified in that nomenclature.
In the ideal sense, guard holds the low-impedance point in the circuit to nearly the same potential as the high-impedance input terminal.
There are two common implementations of GUARD, driven guard and 'feedback' guard inherent to the op amp input of the electrometer.
The 'guarded mode' of the Model 6517B, however, is designed for guarded voltage measurements and will define the inner shield to a driven guard, rather than the feedback guard.
The 'unguarded mode' of the Model 6517B is designed for more standard operations/measurements and will define the inner shield to Input LO to utilize feedback guard.
While you will get the inherent/feedback guard through the op amp input shown in both parts of the referenced figure, it is considered 'unguarded' from the 6517B perspective because it is using fixture/inherent feedback for providing that guard, instead of the driven guard.
This is likely the source of confusion related to our definitions in that figure and its implementation within the greater use of the term 'guard'.
This video demonstrates some of these differences in implementation of that inner shield as guard or input LO:
https://youtu.be/TBVeXlxNO-U

Your understanding is correct, but our nomenclature related to guarded vs unguarded is referring to a different application of the same principle, as describe.
The Low Level Handbook and instrument manual should provide additional details related to these modes and their specific use cases:
https://www.tek.com/en/manual/specialty-instruments/keithley-high-resistance-low-current-electr-0-electrometers

Hello,

I apologize, but this is a strange issue.

I've discussed this request with our development and service teams and we have a few ideas:

Have you tested this on different line power? i.e. at your office or another building?

This could be a power supply issue.

If you continue to experience this issue, I would recommend returning the scope to Tektronix for evaluation.

This way, we can verify the product directly: https://www.tek.com/en/service-quote

Unfortunately, we can't verify what was performed by the other calibration lab and can't comment on their findings.

However, are there other members of the user community who have experienced a similar issue?

Hopefully, other forum members can also weigh in here.

I hope this has been helpful.

Tektronix Applications Engineer