SDM-INT8
SDM-INT8
End of lifeConfigurable8-Channel Interval Timer
Pricing
- Model:
- SDM-INT8
- Item Number:
- 4806
- Warranty:
- 1 year
- Lead time:
- 14 days
Overview
The SDM-INT8 outputs timing data to a Campbell Scientific data logger. The data logger can process the timing data to calculate RPM, duty cycle, velocity, crank angle, etc.
Key Advantages
Allows independent measurement intervals
Technical Description
The SDM-INT8 has eight channels that are individually programmed to record the timing of input voltage transitions (events). It uses this information to output:
- Period (ms)
- Frequency (kHz)
- Elapsed time between events on adjacent channels
- Number of counts measured on channel 2 between a “start” event on channel 1 and a “stop” event on any other channel
- Elapsed time between events on channel 1 and any other channel
- Pulse Counting (any channel can function as a pulse counter)
High Level Voltage Input Pulses Schematic
Low Level AC Voltage Input Schematic
SDM Operation
The data logger enables individual modules through an addressing scheme; up to 15 SDM-INT8s can be connected to one data logger. After a module is enabled, it operates independently of the data logger until additional commands are received or results are transmitted.
Benefits
- Allows individual programming for each of the eight channels
- Includes an internal microprocessor that allows measurement independent of data logger's execution interval
- Outputs period, pulse width, frequency, counts, or time intervals
- Records results as execution interval averages, continuous averages, specified interval averages, or capture all events
Specifications
- Operating Voltage
- 9.6 to 16 Vdc
- Current Drain
- 13 to 20 mA
(active)
- Current Drain
- 400 µA
(quiescent)
- Maximum Timing Measurement
- 16.7 s
- Resolution
- ±1 µs
- Operating Temperature
- -25° to +50°C
- Dimensions
- 0.3 x 12.7 x 2.5 cm
(8 x 5 x 1 in.)
- Weight
- 0.82 kg
(1.8 lb)
High-Level Voltage Input Pulses
- Minimum Pulse Width
- 2 µs
- Maximum Frequency (32-bit values)
- The maximum frequency specification for high-resolution (32-bit) values assumes all eight channels are used.
- Maximum Frequency (32-bit values)
- 5.1 kHz
(averaging options)
- Maximum Frequency (32-bit values)
- 10 kHz
(capturing all events)
- Maximum Frequency (16-bit values)
- The maximum frequency specifications for low-resolution (16-bit) values is for the execution interval averaging only.
- Maximum Frequency (16-bit values)
- If number of channels programmed is
1 channel—42.5 kHz2 channels—17.5 kHz3 channels—11 kHz4 channels—8.6 kHz5 channels—5.2 kHz6 channels—4.8 kHz7 channels—4.5 kHz8 channels—4.28 kHz
Low-Level AC Voltage Input
- AC Voltage
- 20 mV RMS
(min.) ac voltage
- AC Voltage
- 20000 mV RMS
(max.) ac voltage
- Input Hysteresis
- 11 mV
- Minimum Frequency
- 1 Hz
- Maximum Frequency
- 100 kHz
(20 mV min. RMS)
- Maximum Frequency
- 400 kHz
(50 mV min. RMS)
- Maximum Frequency
- 1000 kHz
(150 mV min. RMS)
- Maximum Frequency
- 4000 kHz
(2.5 to 20 V min. RMS)
