Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 84
Foot | Half-Meter | Other
100 | 254 | 246| 400 | 800
The 8310 I/O module is capable of tracking quadrature changes at a rate of 4KHz. This
translates into rotational speeds of 160 revolutions per second for a 100 count/revolution
encoder or 40 revolutions/second for a 400 count/revolution encoder.
InternalTemp
This input type reads the internal temperature sensor of the 8310. This sensor is located on the
microprocessor board and is accurate to +/-1 C. Note that because of heat generated by the
electronics, this temperature may be higher than the environment around it. The only user
setting for this type is the TempUnits: Celsius or Fahrenheit.
Frequency
Frequency inputs are measured by the Digital I/O module. The Frequency input type allows for
the following user settings:
The maximum input frequency is 8kHz when all channels are changing. If only one, then the
limit is higher. The minimum frequency depends on the Period selected with FMIN =
1000/PeriodMS. For example, with PeriodMS of 200, the minimum frequency would be
1000/200=5Hz.
Note: the 8310 does not support low level frequency inputs. The voltage level of the input must
be at least 2.0 volts to be seen as a high and it must be less than 0.5 volts to be seen as a low.
The system measures the number of pulses it sees between successive measurements to
compute the frequency, as long as the last measurement occurred within about one quarter of
the period of when it was supposed to. If the last measurement occurred outside of that
window (or hasn’t yet occurred), then two readings are taken.
Counter
Counter inputs are measured by the Digital I/O module. The Counter input type allows for the
following user settings:
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