Specifications

29
Differential square-wave
Tr (min.) 5µm / 1µm / 0.5µm (resolution)
Phase A
Phase B
Data output timing: 1µm resolution LGB and 1µm / 0.5µm
resolution LGF
The gages listed above use the following three output signal modes.
Reception circuitry can be designed that includes an error detecting process
making use of these mode patterns:
1)
Real-time pulse output (Phase-A wave advances when the
spindle is retracted.)
1. Output condition: Spindle speed ≤ 250mm/s*
2
2. Minimum edge-to-edge interval = Tr
3. Output delay time*
1
: Max. 1μs
2) Burst mode output (Phase-A wave advances when the spindle
is retracted.)
When the spindle speed r
eaches the limit of real-time pulse output,
the gage head switches its signal output to burst mode. These pulse
bursts are 2-phase square wave signals that are forcibly created from
the internal clock with a minimum edge-to-edge interval smaller than
the normal real-time pulse output. The bursts will not always be output
to exactly reflect the actual spindle motion and the delay in signals also
becomes larger, but the counting values will still be valid provided this
output form continues.
Phase A
Phase B
Te (min.)
Phase A
Phase B
Tb (min.) 5µm / 1µm / 0.5µm (resolution)
Data output timing: 0.1µm resolution LGB / LGF and 1µm / 0.1µm
resolution LG / LGM
The gages listed above use the following two output signal modes.
Reception circuitry can be designed that includes an error detecting process
making use of these mode patterns:
1)
Real-time pulse output (Phase-A wave advances when the
spindle is retracted.)
1. Output condition: Spindle speed ≤ Gage response speed*
3
2. Minimum edge-to-edge interval = Tr
3. Output delay time*
1
: Max. 2.5μs
Phase A
Phase B
Tr (min.) 1µm / 0.5µm / 0.1µm (resolution)
Phase A
Phase B
Te (min.)
3) Error output
The pulse generation circuit may sometimes overstep its response limit,
if the output wave is subject to extreme disturbance due to vibration
or impact on the gage head, or if the spindle moves faster than the
output limit of burst mode. However, at this timing, as the gage head
automatically switches its output signal from burst mode to error mode,
in addition to synchronizing Phase A and Phase B of the 2-phase square
wave signals, the user can make use of this facility for error detection.
1. Output condition: LGB will identify an error under the following conditions
and produce its output in one of the modes described above.
• Gage r
esponse speed*
3
< Spindle moving speed
• At a disturbance such as interference, vibration, etc.
2. Minimum pulse width of output pulses = Te
1. Output condition:
250mm/s*
2
< Spindle speed ≤ Gage response speed*
3
2. Minimum edge-to-edge interval = Tb
3. Output delay time*
1
: • At one-way displacement = Max. 5μs
• At two-way displacement (including the reverse
direction) = Max. 10μs
Minimum edge-to-edge interval / pulse width under each condition
Model Resolution Tr (real-time output) Tb (burst output) Te (error output)
LGB
1
μm
1μs 0.5μs 0.2μs
LGF
LGK 0.4
μs — 0.4μs
LG / LGM 0.2
μs — 0.2μs
LGF
0.5
μm
1μs 0.2μs 0.2μs
LGK 0.2
μs — 0.2μs
LGB
0.1
μm 0.2μs — 0.2
μs
LGF
LGK
LG / LGM
[NOTE]
> Since any output during an error condition cannot be used as the attribute data, it is necessary to detect the
error condition at the reception circuitry side.
> It is recommended to design user circuitry based on an IC chip that is capable of counting at 5Mcps (equivalent
to square wave of 1.25MHz) or greater.
*1 : Output delay time: Time until the counting pulse catches up to the spindle position.
*2 : The actual limit of real-time pulse output will be depreciated to this value. This
is because actual detection signals unavoidably contain acceleration components
in association with the spindle motion as well as error components from a little
noise included in the signal itself. As a result, some burst pulses at a speed
below the ideal conditions (i.e. ideal signal form at constant speed) may be
generated.
*3 :
Gage respond speed: Refer to the specifications section in the User’s Manual.
1. Output condition: Gage heads will identify an error under the following
conditions and produce an output as described above.
• Gage r
esponse speed*
3
< Spindle speed
• At a disturbance such as interference, vibration, etc.
2. Minimum width of output pulses = Te
2) Error output