Sony DK812FLR, Instruction Manual

Page: 26 / 40

4 (E)
x Measuring unit output signals
The signals output from this measuring unit are phase A/B/Z signals in the form of
voltage-differential line driver output complying with EIA-422.
The reference point is the synchronized reference point that is at Hi level when the
phase A and phase B are at the Hi level.
Output signals at maximum response speed (at approx. 42 m/min)
Before using, check that the minimum input phase difference of the control device
connected to this measuring unit or the counter is smaller than 100 ns (Phase A
cycle: 400 ns 2.5 MHz).
* The minimum phase difference can be modified under special specifications.
(See 1. Output signal phase difference)
1. Output Signal Phase Difference
The travel amount of the measuring unit is detected every 100 ns, and the phase
difference proportional to the amount traveled is output. The phase difference
changes in integer multiples of 100 ns.
Also, the minimum phase difference for the phase A and phase B is 100 ns.
The minimum phase difference is fixed at 100 ns in the standard specifications,
but the minimum phase differences in the table below are available as special
specifications.
Phase A
Phase B
Integer multiple of 100 ns
Remarks
Standard product
Special specifications
Special specifications
Phase A
Phase B
100 ns
400 ns (2.5 MHz)
Phase A
Phase B
Phase Z
A/B minimum
phase
difference
100 ns
300 ns
500 ns
Phase A cycle
400 ns
1.2 µs
2 µs
Counter allowable
frequency
2.5 MHz
833 kHz
500 kHz
Resolution
0.1 µm
42 m/min
14 m/min
8.4 m/min
Resolution
0.5 µm
100 m/min
33 m/min
20 m/min
Maximum response speed