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Overview
The SDM-INT8 outputs timing data to a Campbell Scientific datalogger. The datalogger can process the timing data to calculate RPM, duty cycle, velocity, crank angle, etc.
Read MoreBenefits and Features
- 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
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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.
Specifications
| Operating Voltage | 9.6 to 16 Vdc |
| Current Drain |
|
| 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) |
|
| Maximum Frequency (16-bit values) |
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Low-Level AC Voltage Input |
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| AC Voltage |
|
| Input Hysteresis | 11 mV |
| Minimum Frequency | 1 Hz |
| Maximum Frequency |
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Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Dataloggers
| Product | Compatible | Note |
|---|---|---|
| CR1000 (retired) | ||
| CR200X (retired) | ||
| CR216X (retired) | ||
| CR3000 | SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3. | |
| CR5000 (retired) | SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3. | |
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR9000X (retired) | SDMs connect to ports provided on the CR9032 CPU module. |
Miscellaneous
| Product | Compatible | Note |
|---|---|---|
| GRANITE 10 | ||
| GRANITE 6 | ||
| GRANITE 9 |
Additional Compatibility Information
Data Logger Considerations
Programming
The SDMINT8 instruction controls the SDM-INT8 operation in CRBasic. Instruction 101 controls the SDM-INT8 operation in Edlog.
Power Considerations
The SDM-INT8 draws 20 mA. In most applications, the data logger’s sealed rechargeable power supply can be used. The data logger’s alkaline power supply has sufficient capacity to operate the SDM-INT8 during short-term installations only.
Enclosure Considerations
The SDM-INT8 should be housed in an environmental enclosure. A bracket is shipped with the SDM-INT8 for mounting it to an enclosure backplate.
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