First, I presume you emailed the folks at Vernier? I visited their offices
over the summer and they seemed to have Logger Pro running on every Mac ever
made. Further, they were working on an upgrade to their software while I was
there. They said it should be ready by Christmas.
Second, yes, the Logger Pro can only collect a limited amount of data at a
time.
Dave Vernier can probably explain this better, but it is really a two part
problem. The first is that the old serial connection which both the LP and
Pasco boxes used is really too slow to take a large amount of data rapidly.
So, the interface boxes had to take the data and then transfer it the
computer. You could see some of the data "live" but it was a subset of all
the data. Although USB is faster, it is interruptable, meaning that the OS
can ask the device to stop sending data and some sort of buffer is needed.
The much more expensive Pasco 750 interfacees use a SCSI connection which
seems to allow better data gathering.
The other problem is synchronizing the time very precisely between the data
collection, especially of multiple probes. I believe that an internal clock
helps to keep the data paired relatively precisely with the time.
Marc "Zeke" Kossover
-------- Original Message --------
Subject: Re: LoggerPro problems with Macs G-3s?
Date: Wed, 17 Oct 2001 13:00:27 -0700
From: Bernard Cleyet <anngeorg@pacbell.net>
Another problem is the LP is limited in the amount of data it will
collect. I
guess it collects into its own memory and then sends it to the computer.
When
the "on board" mem. is full, it stops collecting? Bad.