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Chapter 3: Interface Description
Front Panel
The following is the front panel description of the Digidata 1550B digitizer.
Figure 3-1: Front Panel of the Digidata 1550B digitizer
There is a single rocker‐style On/Off switch.
There are two indicator lights: POWER and READY.
When the digitizer is powered on, and the USB cable is connected to the computer, the
green POWER light is continuously on.
When the digitizer is recognized by the software and ready for use, the yellow READY light
is continuously on.
The front panel connectors are all BNCs.
Analog Inputs
There are eight 16‐bit single-ended analog input channels. The BNC shields for the Analog
Inputs are connected to the Analog ground. All of these channels can be used simultaneously
without any reduction in throughput for each channel. These input channels are typically used
to digitize biological signals. Depending on the Digidata 1550B digitizer model, when the
HumSilencer Adaptive Noise Cancellation System is available, Analog Input Channels #0, or
Analog Input Channels #0, #2, #4, and #6 are configurable for eliminating ground signal noise.
Analog Outputs
The front panel has eight 16-bit analog output channels. Each channel has an operational
amplifier to buffer the output signal of the D/A converter. The eight analog output channels can
be simultaneously used for waveform generation.
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