SDM-SW8A

The SDM-SW8A is an 8-channel pulse count module; each channel can be individually configured for single-pole double throw (SPDT), single-pole single throw (SPST), or voltage pulse measurements. Output options include state, duty cycle, or counts. The SW8A is well suited for use in energy mangement studies. We recommend a maximum of four SW8As be connected to a single datalogger.
Features
Provides eight individually configured channels
Measures reed switches, dry contacts, or slow voltage pulses
Supports single-pole double-throw (SPDT), single-pole single-throw (SPST), or voltage pulse measurements
Conforms to EN55022-1:1995 and EN50082-1:1992
Specifications
Measurement Types: switch closure (SPDT, SPST) dc voltage pulse
Input Voltage Threshold: from below 0.9 to above 4.0 Vdc; ±20 Vdc maximum
Maximum Input Frequency: 100 Hz (50% duty cycle)
Minimum Input Pulse Width: 5 ms high, 5 ms low
Maximum Bounce Time: 3 ms open without counting
Output Options: state, duty cycle, counts
Maximum CountPort: 65535
Internal Sampling Frequency: 500 Hz
Watchdog Reset: yes
Operating Voltage: 9.6 to 16 V
Typical Current Drain: 3 mA quiescent, 6 mA active (maximum)