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The disclosed digital tachometer accepts input encoder pulses produced by a moving member and generates an output speed signal that is directly proportional to the speed of a moving member.
English (United States)
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Digital Tachometer with Scaling
The disclosed digital tachometer accepts input encoder pulses produced by
a moving member and generates an output speed signal that is directly
proportional to the speed of a moving member.
The figure illustrates a functional diagram of such a digital tachometer which
accepts input encoder pulses 1 from an optical device that provides pulses in
response to sensing the passing of physical marks on a moving member, and
generates an output speed signal at output 2. The time between the encoder
pulses is measured and used to select a corresponding speed from a table
stored in read only memory (ROM) 3. This digital tachometer can be
programmed for a desired speed resolution and can be scaled for increased
dynamic range during operation.
An Exclusive OR gate 4 is used to prevent speed errors due to overlapping of
encoder pulses 1 as a result of, for example, the slow speed of the moving
member producing the pulses. Divide by two functional blocks 5 along with four
d() divided by dt functional blocks 6 (which reduce encoder pulses 1 to only
edges) provide for four different speed resolutions. Speed is scaled with a two-
bit scale factor represented by block 7 which selects the encoder pulse edges (i.e., resolution) to be used for subsequent timing measurements. Time counters
8 count clock pulses from a stable time base 9. The count accumulated between
the selected edge pulses along line 10 is then stored in temporary storage 11.