VMIVME-4140 32 CHANNEL 12-BIT ANALOG OUTPUT BOARD
Features:
- 32 analog output channels
- 10mA maximum output current per channel
- One 12-bit D/A converter (DAC) per output channel
- 0.8Ω output impedance
- Random update (nonscanning)
- Software or external synchronous update of double‑buffered outputs
- Single reference potentiometer – no other manual calibration required
- Automatic calibration initiated by reset or by software command
- Unipolar (0 to +10V, 0 to +5V, 0 to +2.5V) or bipolar (±2.5, ±5 and ±10V) software selectable
- Discrete wire or mass‑terminated cables
- Self-test
- Extensive onboard diagnostic testing capability
- Outputs can be disconnected from the field for offline
- PMC expansion slots
- self-testing
- Front panel status LED
- Front panel analog output connector
- Front panel reference voltage access
- Applications
- Data acquisition systems
- Control systems
- Precision analog stimulus
– Automatic test equipment (ATE)
Functional Characteristics
Introduction: The VMIVME-4140 Analog Output Board provides 32 high quality analog output channels with 12-bit resolution, and can source or sink 10 mA at ±10 V. Each output has a dedicated D/A Converter (DAC) assigned to it. The analog outputs can be disconnected from the field wiring for offline testing. Calibration and self-test are initiated by a VMEbus system reset or by execution of a software command. During calibration, a table of offset and gain coefficients is compiled and stored in RAM. There is an entry for offset and gain corresponding to each of the 32 channels configured in each of the six output voltage ranges.
Self-Test: Self-Test is run automatically after system reset. The Self-Test Register indicates success or failure and can indicate the channel which has failed.
Front Panel Status LED: The LED is illuminated after a system reset. The LED is extinguished on the successful completion of self-test and autocalibration. The LED can also be turned ON and OFF under software control.
Front Panel Reference Voltage Access: An isolated BNC connector on the front panel allows access to the internal reference voltage. Front panel access to the corresponding reference voltage adjustment is provided.
Calibration: When autocalibration is initiated, either by a system reset or software command, an embedded DSP loads calibration output values into each of the output DACs which are read back into the DSP through a 16-bit ADC. This is repeated until a sufficient number of calibration points have been measured. A calibration table consisting of offset and gain corrections for each of the 32 outputs in each of the six voltage ranges is compiled and stored in RAM. These correction factors are recalled each time an output is changed.
System Reset: After a system reset, all outputs are in the offline mode, all Control Registers are in their default state, self-test is initiated, and autocalibration is initiated.
VMEbus Compliance: This board complies with the VMEbus specification (ANSI/IEEE STD