Spectrum Controls 140 EHC 204 00sc - Manual (Page 30)

Counter / Flow Meter Input Module
31
30 kHz Filter, Bit 12
The 30 kHz filter is recommended for counter or flow meter applications running at speeds less
than 25 kHz. Set this bit to 0 when running to speeds of 50 kHz. Setting this bit to 1 filters input
noise above 30 kHz.
15 kHz Filter, Bit 11
The 15 kHz filter is recommended for counter or flow meter applications running at speeds less
than 15 kHz. Set this bit to 0 when running to speeds above 15 kHz. Setting this bit to 1 filters input
noise above 15 kHz.
Count Size, Bit 10
This bit determines the maximum counter value. When set to 0 the channel counter will count
up to 65,535 (1- 16bit word of data). When the maximum value of 65,535 is reached, the Maximum
Count flag is set, and rollover will occur at this point. When the count size is extended to 16,777,216
by setting this bit to 1, the Counters Maximum flag is extended to 16M and data output is formed
using two words. The counter Preset and Limit values are also extended to 16M. This means that the
resolution of the Preset and Limit values are set in blocks of 256 counts (8bits) beacause only one
word is available for each limit. This allows the preset and limit values to cover the whole 16M bit
range.
Rate Scale, Bit 9
The Rate Scale bit allows the user to adjust the resolution of the Rate output word. The default
resolution is 1Hz. Setting this bit to 1 changes the resolution to 0.1Hz. The Rate output word is a 16
bit integer. When set to 0.1Hz the decimal point is implied to be the first position in the integer word.
For example, 1Hz rate = 32767, 0.1Hz rate = 3276.7 .
Note: This setting is only valid while operating in the Instantaneous Rate Mode.
Bits 8 through 1 - Not Used