®
Model No. CI-7599
750 Interface (USB)
19
* Continuous sampling with 5 channels selected is not possible to
sustain for more than a few seconds.
There are five analog channels from which to choose: channels A-C,
analog output voltage (at banana jacks), and the analog output current.
Please note that for continuous sampling, the speed of the computer
may slow down, especially if the interface is busy processing with
many displays open in DataStudio.
Note:
The sampling rate does not depend on the number of digital
channels selected in DataStudio, as they are sampled separately and
simultaneously at 10 KHz.
Built-In Function Generator/Amplifier
The USB 750 has a built-in function generator that is used to output
analog signals. These can be either AC signals, such as sine and
triangle waveforms, or a DC signal, ranging b/- 5 volts. For
the AC waveforms, of which there are eight waveforms resident in
Flash, the frequency can range from 1 mHz (0.001 Hz) to 50 KHz and
the peak-to-peak amplitude can be adjusted from 0 V to +/- 5 V with
increments of 2.44 mV. The output voltage is calibrated at the factory
to null the offset voltage and set the full scale voltage.
Accessing Analog Output
There are two different methods of accessing the analog output signal.
The first is to connect the test leads to the 750 interface output banana
jacks. The output current can be monitored along with the output
voltage. The second is to use a CI-6552A Power Amplifier (which has
a voltage gain of 2 and delivers 10 W) and connect its DIN plug to one
of the analog channels, A-C.
Digital Event Sampling
The 750 can sample digital events for photogate timing. The 750 uses
hardware edge detection so that it can capture either edge or both as
events, a feature useful for setting trigger conditions. It can count
digital events from devices, such as a Geiger tube or a Rotary Motion
Sensor. Each channel has an independent 16-bit counter. For motion
sensing, either single or dual, the internal counters and edge detectors
provide improved performance with less noise in the measurement.