The Keithley DAS-1801HC is a 12-bit multifunctional I/O board engineered for high-performance data acquisition and control in industrial, scientific, and laboratory environments. It delivers continuous, gap-free sampling through dual-channel DMA and onboard FIFO buffers, supporting up to 64 single-ended or 32 differential analog input channels with software-configurable gains and input ranges. The board integrates 2 waveform-quality analog outputs, 4 digital inputs, and 8 digital outputs with strobe signaling, making it suitable for precision measurement and system automation across diverse applications.
## Technical Specifications
**Analog Input Performance**
• Resolution: 12-bit
• Channel Configuration: 64 single-ended or 32 differential channels (software-selectable)
• Single-Channel Sampling Rate: Up to 333 kS/s
• Aggregate Sampling Rate: Up to 312.5 kS/s
• Input FIFO Buffer: 1024 words
• Channel/Gain Queue: 64 locations for non-sequential and variable-gain sampling
**Gain and Range Options (Model 01)**
• Programmable Gains: 1, 5, 50, 250
• Input Ranges: ±5 V, ±1 V, ±100 mV, ±20 mV
**Gain and Range Options (Model 02)**
• Programmable Gains: 1, 2, 4, 8
• Input Ranges: ±10 V, ±5 V, ±1.25 V
**Analog Output Performance**
• Output Channels: 2 waveform-quality outputs
• D/A Update Rate: 500 kS/s
• Output FIFO Buffer: 2048 locations
**Noise Characteristics**
• Bipolar (Gain 1): 1 V p-p, 0.1 V rms
• Unipolar (Gain 5): 1 V p-p, 0.1 V rms
• Bipolar (Gain 50): 4 V p-p, 0.4 V rms
• Unipolar (Gain 250): 4 V p-p, 0.4 V rms
**Digital I/O**
• Digital Inputs: 4
• Digital Outputs: 8 with strobe signal
**Power Supply**
• Available Rails: +5 V, –15 V, +15 V at connector
**Bus and Data Transfer**
• Interface: 16-bit AT bus data transfers
• Connector: 100-pin D-type (rear panel)
## Key Features
• Continuous sampling with dual-channel DMA eliminates data gaps
• Flexible channel configuration supports single-ended and differential input topologies
• High-speed queue processing enables rapid gain and channel switching
• Dual FIFO buffers optimize data throughput and latency performance
• Strobe-controlled digital outputs simplify external circuit integration
## Typical Applications
• Multi-channel sensor data acquisition and logging
• Real-time process control and automation
• Precision test and measurement systems
• Laboratory instrumentation platforms
• Industrial monitoring and diagnostics
## Compatibility & Integration
**Computer Systems**
• IBM PC AT and compatible computers
• Windows and DOS operating environments
**Software**
• Bundled LabVIEW VIs (National Instruments compatible)
• Includes start-up utility for rapid board configuration
• DriverLIN support
