Campbell Scientific SDM-INT8 8-Channel Interval Timer - Manual (Page 9)

SDM-INT8 8 Channel Interval Timer
2. Specifications
Operating voltage: 9.6 V to 16 V DC
Current drain: 13 to 20 mA active, 400 microamp quiescent
Environmental: -25 to +50 degrees Celsius 0 to 90% RH (non-condensing)
Number of channels: 8
Maximum timing measurement: 16.7 seconds
Resolution: ± 1 microsecond
Dimensions: 8 x 5 x 1 in (13 x 20 x 2 cm)
Weight: 1.4 lbs (635 g)
Input voltage option per channel: high level, low level
High Level Voltage Input:
- Minimum pulse width: 2 microseconds
- Signals edges:
rising: transition from < 1.5 to > 3.5 volts
falling: transition from >3.5 to<1.5 volts
Maximum input voltage: 20 volts
- Maximum frequency:
5.1 kHz when using Averaging Options
10 kHz when Capturing All Events
The Low Resolution Frequency function allows higher frequencies to be
measured if it is used on all programmed channels with Execution Interval
Averaging. Maximum frequency is dependent on the number of channels
programmed, as shown below:
No. of Channels Max Freq (kHz)
1
42.5
2 17.5
3 11.0
4 8.6
5 5.2
6 4.8
7 4.5
8 4.28
Low Level Voltage Input:
- Minimum AC voltage: 20 millivolts RMS
- Input Hysteresis: 11 millivolts
- Maximum AC voltage: 20 volts RMS
- Minimum frequency: 1 Hz
- Maximum frequency:
3