Digidata 1550 Low-Noise Data Acquisition System User Guide
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3.
Disconnect all external instruments and test the
digitizer/computer combination by itself.
4.
Next, swap the unit with a known good unit to help determine
whether the problem is with the digitizer or the computer.
Power Light on the Front Panel Off
Check the power supply to make sure that all cables are firmly attached,
as well as the USB 2.0 cable to the computer.
Ready Light on the Front Panel Flashes Continually
The Digidata 1550 digitizer is in a problem state. Call Technical Support at
Molecular Devices for a Work Order (WO) number before returning the
unit for repairs.
Problems With Analog or Digital Outputs
Check the
Lab Bench
and protocol. Use a voltmeter or oscilloscope to
examine the output signals.
Problems With Analog or Digital Inputs
Check the
Lab Bench
and protocol. Connect a known signal source to an
analog input, such as a signal generator, or even the digitizer’s analog
output, if you know it is working properly.
Screen Shows a Straight Line Instead of the Input Signal
•
Check if all external connections are properly made.
•
Swap BNC cables to check BNC cables for continuity problems.
•
Make sure the USB cable is securely attached to both the
computer and the interface box.
Screen Shows Different Signal Shape Than Expected
Verify that the acquisition software is not configured for a demo digitizer
(
Configure > Digitizer
). Demo mode reproduces a command waveform
(with added noise), or generates artificial spike trains. Also, check the
software for any inappropriate filtering.
Note:
Oscilloscopes can potentially introduce unwanted ground loops
and noise.
