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:
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.
|Operating Voltage||9.6 to 16 Vdc|
|Maximum Timing Measurement||16.7 s|
|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)||
Low-Level AC Voltage Input
|Input Hysteresis||11 mV|
|Minimum Frequency||1 Hz|
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
|CR3000 (retired)||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.|
|CR9000 (retired)||SDMs connect to ports provided on the CR9080 PAM module.|
|CR9000X (retired)||SDMs connect to ports provided on the CR9032 CPU module.|
The SDMINT8 instruction controls the SDM-INT8 operation in CRBasic. Instruction 101 controls the SDM-INT8 operation in Edlog.
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.
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.