Hi
I am considering a USB or an ethernet 9234 module
to be used as a digitizer in our measurement setup. It should replace
the capturing of data we currently perform with a Tek scope (via
ethernet or a USB stick). The scope is still needed to look at the
shape of my signals and for adjusting the other instruments in my setup
but I dont like the resolution (9bit), the accuracy (+-2%) and the
number of points (10k) it produces when you finally pull the data from
it.
I want to have the 9234 module next to the scope
and plug the signal cables from the scope to the 9234 module when I am
satisfied with their shape on the scope and need to digitize them.Then
I would like to go to the LabView PC (or laptop), press a few buttons
and get my data in a file.
The signals have the following specifications:
provided by battery-powered low noise amplifiers (floating and thus GND referenced through the scope or module)
range: 100s of mV
freq: DC to <10kHz
channels: at least 2, should be simultaneously captured and synchronized
no excitations
I have a few questions:
-
are the 2 channels simultanelusly sampled in the sense that, for
example, the 10th sample of channel 1 is taken at the same time (within
jitter etc. specs) as the 10th sample of channel 2? This is ask because
I need to make an x-y plot later from the 2-channel data.
- on the PC, I only need to input the sample rate, the
number of samples and the number of channels n (mostly, n=2) to be
simultaneously digitized and I want a n-column ASCII text file with the
n-channel data aligned (comma, tab or space separated - it doesent
matter) per sample at the end. Can this be done, with quite modest
LabView skills, to work within ~ 1 day?
- what is the magnitude of the protection-diode bias current in the input circuit?
- the ethernet or the USB 9234? Any issues that I should be aware of when choosing between the two?
-
the specifications for the accuracy cite "calibrated" and
"uncalibrated" conditions. Does the module self-calibrate or do we need
to send it to NI for calibration periodically?
-is the ethernet cable or USB cable ground the same as the module ground?
I realize these are very basic questions. Hence, I will be satisfied with simple answers. Thanks!
