-40%
Campbell Scientific SDM-INT8 8-Channel Interval Timer
$ 52.8
- Description
- Size Guide
Description
Unit with mounting bracket only.From the manufacturer:
Detailed 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
13 to 20 mA (active)
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.
5.1 kHz (averaging options)
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.
If number of channels programmed is
1 channel—42.5 kHz
2 channels—17.5 kHz
3 channels—11 kHz
4 channels—8.6 kHz
5 channels—5.2 kHz
6 channels—4.8 kHz
7 channels—4.5 kHz
8 channels—4.28 kHz
Low-Level AC Voltage Input
AC Voltage
20 mV RMS (min.) ac voltage
20000 mV RMS (max.) ac voltage
Input Hysteresis
11 mV
Minimum Frequency
1 Hz
Maximum Frequency
100 kHz (20 mV min. RMS)
400 kHz (50 mV min. RMS)
1000 kHz (150 mV min. RMS)
4000 kHz (2.5 to 20 V min. RMS)
Compatibility
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
Data Loggers
Product
Compatible
Note
21X (retired)
CR10 (retired)
CR1000
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR3000
SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3.
CR500 (retired)
CR5000 (retired)
SDMs are connected to the ports labeled SDM-C1, SDM-C2, and SDM-C3.
CR510 (retired)
CR6
CR800
CR850
CR9000 (retired)
SDMs connect to ports provided on the CR9080 PAM module.
CR9000X
SDMs connect to ports provided on the CR9032 CPU module.
Mounting Equipment
Product
Compatible
Note
ENC10/12
ENC10/12R
ENC12/14
ENC14/16
ENC16/18
ENC24/30
ENC24/30S
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.