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

[ledtester]

What sampling rate do you need?

[Martin72]

Hi,
It's hard to say when it was completely analog before.
I had looked at the device today for the first time, looks funny with the paper roll inside, with the millimeter imprint.
But the colleague who told me that we need something new, he can tell me tomorrow times, where he wants to have the measurement voltage connected to the recorder.
I could not see anything earlier, except temperature inputs ..

[Kim Christensen]

It's hard to say when it was completely analog before.

Well, the pen line thickness and the max paper feed rate, should give you a good idea about a ballpark "sample" rate.

[Martin72]

Yepp, that's why tomorrow I'll have the protocols given to me where they had pasted the paper sections.

[switchabl]

Why not a Keysight Data Acquisition unit 34970A or 34972A
This is especially designed for the application you have

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.

I think a DMM6500 with a 2001-TCSCAN card should be enough if all you need is a few thermocouple and voltage channels (up to 125 Vrms). IIRC the DAQ6510 just has more cards available (with higher channel count/special features) and you can install two of those at the same time.

EDIT: The pricing on the DAQ6510 + 7700 bundle seems to be pretty similar though. So still worth a look if you don't have a DMM6500 already.

[ledtester]

Hi,
It's hard to say when it was completely analog before.

I just tested using SCPI with my Fluke 8845A and with simple programming I can get 2 samples per second through SCPI polling. (I realize this seems awfully slow but 1) I'm not an expert yet at utilizing the meter through SCPI and 2) I'm intentionally not placing the measurements into the measurement buffer because then you'll be limited by the size of that memory.)

Anyway, if that's fast enough for you then polling should work for you. You might even be able to use the "program that can log from many multimeters" and avoid having to do any programming:

https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/

[ledtester]

I just tested using SCPI with my Fluke 8845A...

An update... I figured out how to stream readings indefinitely from the 8845... you use the READ? directive. The Fluke user manual has this to say about measurement rates - the Ethernet interface is capable of transferring 900+ measurements/sec.

[Martin72]

I´ve looked in a protocol today with a measurement section copied in there from the recorder, it´s hard to read...
The outputvoltage is plotted as a line, so it´s measured in rms.
Paper stroke is 20mm/h, so the length after 8 hours is 160mm.
If I have the time tomorrow, I would test the hioki if it measure( and displaying) the voltage in rms.