NI 5922 Channel Terminal Configuration

The NI 5922 provides the following three options for channel terminal configuration:

• Single-ended—In this mode, the shield of the BNC connector is grounded directly to the digitizer front panel.
• Unbalanced differential—This mode is sometimes referred to as pseudodifferential. In this mode, the shield of the input BNC is connected to ground through a resistor. In parallel with the resistor, two antiparallel diodes have been added to protect the programmable gain amplifier, which is limited to ±5 V signals. This mode allows the differential programmable gain amplifier to reject common-mode noise sources from the input signal.

  

• Differential—The difference between the two channels is derived in hardware by converting both channels to digital and subtracting the outputs digitally as (CH 0 – CH 1). In differential mode, the two channels are configured as unbalanced differential. CH 1 automatically uses the configuration of CH 0. This mode enables one channel of balanced differential measurements.

  

  Note    To set the channel terminal configuration, use the Channel Terminal Configuration property or the NISCOPE_ATTR_CHANNEL_TERMINAL_CONFIGURATION attribute.