Andrea C

Interesting topic.
A few years ago I had a customer use two SMU channels:  one for sensitive current measure and one to generate a voltage signal for a fiber alignment tool.
If simulating a changing current with few hundred Hz sinewave + resistors, we saw about 200usec of dwell time on each step of the following voltage signal.

In that case, the two SMU channels were within the same physical box, e.g., dual channel 2602B.

Can you use the two channels in the 2634B?
Since 2634B does not have TSP-LINk feature, it is limited for coordination with the 2657A.
If strongly determined to eliminate a PC from the mix, you could try the use of tsp-net and have the 2657A send commands over LAN to the 2634B.

Sounds like you are hoping the 1MHz digitizer in 2657A will give you fast loop rate.  But you are still taking single shot measurements, computing the voltage level and needing to source it.  I’d expect other overhead, specifically the voltage sourcing rate of the other SMU, will be your rate limiting factor.

Try:  https://my.tek.com/en/tektalk/oscilloscopes/eb32fc12-546a-ee11-a81c-00224803fcc5#dee92ab4-ee6f-ee11-9ae7-6045bd0a10eb

Q:  Is it possible to load a .csv to 2450 using pyVISA to generate the current pulses?

A:  Yes but will require some coding to pass the values of the csv to a source configuration list.
And building a trigger model to step through the list at a desired rate to achieve the waveform timing.

In your uploaded image of the pulse, they are about 2 seconds in duration.  Agree?
How many points would you want to use to approximate that pulse?

Is SMU sourcing only?  No measure?

Since your source function is current, the voltage compliance limit command would look like this:
:SOUR:CURR:VLIM 5

Separate from this is a protection level.  The instrument is capable of up to 200V.  The protection level lets you set an upper limit on this.
Suppose you meant to set the VLIM to 5.0 but passed 50 by mistake.  Having a PROTection level at 10 would restrict the output to 10V.

SOUR:VOLT:PROT PROT10

NOTE the enumerated values for protection level,  12 discrete values supported.

I note in the code, there is use of the TLINK connector digital triggering of the 2400 (TRIG:ILIN or TRIG:OLIN).
Unlike the 2602B, the 2604B does not have any digital IO.
The 2400 emulation is trying to map the TLINK triggering to digital IO lines in the 2600B.
Unfortunately, the model you picked does not have any digital IO.

And just checking: you mention you got the 2600B to be able to go to higher currents than what the 2400 can provide.
Using the emulation of 2400, the same 1Amp restriction will be applied.  You will not be able to access the new features of the 2604B when addressing it as a 2400.

The source meter can be configured to output a list of values from a source configuration list.
By controlling the speed of outputting each value from the list, the waveform can be generated.
Keep in mind, the max speed of 2450 for source + measure operations is about 1700 operations per second.

Github Sample Code for Current Sine Wave with 2450

What sort of timing in your arbitrary current were you hoping for?

Our model 6221 has an ARB mode with faster current sourcing than 2450.

TekScope Utility = free software

TekScope PC = has free entry level version and paid license versions too
TekScope PC Pricing and License Info

I want to be a little bit picky about the names of the software.

TekScope Utility is a Free software utility written by an Applications Engineer.
He has posts here on TekTalk that offer the download link of this *free* software.

We have a different software that does have paid license as well as an entry level free version:  TekScope PC

TekScope PC FAQ

TekScope PC License Levels
 

Here are links to resources to get started using TSP command set:

App Note: How to Write Scripts for TSP

TSP Example Repository

TSP Video Series

TSP Landing Page on Tek.com

TSP Toolkit Feature Walkthrough

VSCode extension for TSP Toolkit

Yes, it can do this with the DAQ6510 and a multiplexer card like 7701.

The instrument supports scans of channels where a measure function is assigned to each channel in the scan.
Scan supports the use of the Diode Test function where we force the selected amount of current and measure V using 10VDC range.
This use of Scan approach typically gives best throughput and easy to setup.

An alternate approach is to command a channel or channels to close.  And then separately send commands to the internal DMM to config and perform measurements.  Take note that closure of backplane relays to connect to the DMM is required as well as MUX channel closure.
In the case of model 7701 and Diode Test function, close "channel" relay 35 to connect card channels to internal DMM.
The first approach using scan takes care of backplane relays for you according to the assigned measure function.
See Multiple-Channel operation in the Reference Manual for DAQ6510.