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Modern replacement for 2-channel recorder with high voltage input needed
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CatalinaWOW:

--- Quote from: Martin72 on August 15, 2023, 09:13:15 pm ---Hi,
I'm going to feed the Hioki a 400Hz voltage the next few days at work, less than 115V of course, to see if it even measures/displays correctly.
If that works, I will calculate a 1:10 voltage divider.
We have 0.2% resistors in stock, so that the accuracy can be sufficiently taken into account.
I will then report with results and thank you already now all who had participated with ideas and suggestions. :-+
Nevertheless, I find it amazing that there is no direct successor to the old paper recorders, which can measure high voltages and temperature (-sensors) simultaneously. :P

--- End quote ---

I don't find it amazing.  These paper chart recorders started in the vacuum tube era, and their demise came when A to D converters became small and cheap.  Their replacements didn't have to deal primarily with high voltages, instead instrumentation had moved down to much lower voltages and currents.  The market for high voltage recording had shrunk.

In addition, signal conditioning was frequently a requirement for all of these systems, from the paper recorder era on, so expecting a customer to provide needed voltage dividers, clamps, rectifiers and filters as required was not a shock to the market.  If you are willing to accept this requirement for signal conditioning there are really a lot of devices on the market.  From just one vendor for example:

Module that interfaces to computer for data storage and display
https://www.omega.com/en-us/data-acquisition/data-acquisition-modules/p/OMB-DAQ-2408-Series

Full data logger.   Does all data collection and storage.  Will require a computer to display/analyze the data.
https://www.omega.com/en-us/data-acquisition/data-loggers/multichannel-programmable-and-universal-input-data-loggers/p/OM-CP-OCTPRO-Logger


Caliaxy:
Fluke t3000fc (about $220 in US) can record about 65000 datapoints in its internal memory. I used one recently to monitor the temperature in a freezer (for about 22 days, continuously, one datapoint every 30 sec). Worked flawlessly. The batteries (2 AA) last about a month. Fluke sells specialized units for different measurements (each unit can only measure one thing - DCV, ACV, DCA etc.; to monitor two voltages and a temperature, you need three units). The hardware quality is superb. Each data point is time stamped, so the traces can be correlated.
Domitronic:

How about the Keithley DMM6500 with scanner card? AFAIK it can store up to 7M measuring points on internal memory. Not sure if it is able to write data directly to external USB drive while measuring or only after recording has stopped. Might be worth to check the datasheet.
HighVoltage:
Why not a Keysight Data Acquisition unit 34970A or 34972A
This is especially designed for the application you have

Domitronic:

--- Quote from: HighVoltage on August 16, 2023, 10:17:11 am ---Why not a Keysight Data Acquisition unit 34970A or 34972A
This is especially designed for the application you have

--- End quote ---

I agree. Seems to be the better choice compared to multimeters but also more expensive. The ones you mentioned seem to be discontinued. But there is the DAQ970A / DAQ973A now. And from Keithley the DAQ6510.
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