
(B) Burst pulse output (Phase-A wave advances when the spindle is retracted.)
When the response speed reaches the speed limit of real-time pulse output, the linear gage will switch
its signal output form to that consisting of burst pulses. At this time, these burst pulses will be such
2-phase square wave signals that are forcibly created from the internal clock so the minimum
edge-to-edge interval in their output is smaller than the normal real-time pulse output. The burst pulses
will not always be outputted so as to exactly reflect the actual motion and the delay in signals also
becomes larger, but the counting values will be still valid as long as this output form continues.
(1) Output condition: 250 mm/s *4 < Spindle moving speed ≤Gage response speed *6
(2) Minimum edge-to-edge interval of output pulses: Tb (See the following table.)
(3) Output delay time *5: ●When feeding the spindle forward = Max. 5 μs
●When returning the spindle backward = Max. 10 μs
(C) 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 in the gage unit, or if the spindle moves faster beyond
the output limit of burst pulses. However, at this time, as the linear gage will automatically switch its
output signal form from burst pulses to error pulses and also synchronize 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: The gage will be identified as error under the following conditions and
produce its output in one of the above described special patterns.
●Gage response speed *6 < Spindle moving speed
●At a disturbance such as noise interference, vibration, etc.
(2) Minimum edge-to-edge interval of output pulses: Te (See the following table.)
Minimum edge-to-edge interval / pulse width under each condition
Resolution Tr (for real-time pulse) Tb (for burst pulse) Te (for error pulse)
5μm 1μs 1μs 0.25μs
1μm 1μs 0.5μs 0.25μs
0.5μm 1μs 0.25μs 0.25μs
*4: 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 minute 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.
*5: Output delay time: Time until the counting pulse catches up the spindle position
*6: Gage respond speed: Refer to the section of specifications of the Users Manual.
IMPORTANT
zSince any output during error can not be used as the attribute data, it is necessary to detect the error
condition at the reception circuitry side.
zIt is recommended to design user circuitry based on an IC chip that is capable of counting at 5 Mcps
(equivalent to a square wave of 1.25 MHz) or greater.
5) Input connector and recommended input circuit connector: RM12BRD-6S (HIROSE ELECTRIC)
6) Cable extendible length: The cable can be extended up to 20m using the extension cable (optional).
6. Maintenance
1) Replacing the contact point
Fit the supplied key spanner in the keyway of the spindle, then detach or
attach the contact point by pinching it with a wrench, etc.
IMPORTANT
If torque is applied to the sensor inside through the spindle,
damage or malfunction in the sensor may result. Be sure to
fix the spindle using the key spanner.
2) Replacing the rubber boot
Preventive replacement before being damaged is recommendable.
(The rubber boot is available as an optional accessory.)
(1) Remove the old rubber boot, then eliminate the dust and dirt in the grooves (part A) of the stem and spindle.
(2) Insert a rubber boot between the stem and contact point, directing the greater inside diameter end to the stem.
(3) Apply a small amount of silicone adhesive to the grooves (part A), and seal both ends of the rubber boot.
IMPORTANT
If the adhesive is applied to the spindle, the spindle will not slide properly. Great care must be exercised.
7. Specifications
Order NO. 542-161 542-162 542-163
Model No. LGF - 110L - B LGF – 125L - B LGF – 150L - B
Resolution 1μm
Accuracy (at 20 ℃) (1.5 + L/50) μm L = Measured length in mm
Output signal pitch 4μm
Minimum edge interval 500ns
Order NO. 542-171 542-172 542-173
Model No. LGF – 0510 L - B LGF – 0525L - B LGF – 0550L - B
Resolution 0.5μm
Accuracy (at 20 ℃) (1.5 + L/50) μm L = Measured length in mm
Output signal pitch 2μm
Minimum edge interval 250ns
Order NO. - 542-612 542-613
Model No. - LGF – 0525L - B LGF – 0550L - B
Resolution - 5μm
Accuracy (at 20℃) - (7.5 + L/50)μm L= Measured length in mm
Output signal pitch - 20μm
Minimum edge interval - 1000ns
Measuring range 10mm 25mm 50mm
Contact point downwards 1.2 N or less 4.6 N or less 5.7 N or less
Contact point horizontal 1.1 N or less 4.3 N or less 5.3 N or less
Meas.
force
Contact point upwards 1.0 N or less 4.0 N or less 4.9 N or less
Stem Diameter Φ8 Φ15
Specifications common to all series
●Quantizing error: ±1 count ●Positional sensor: Photoelectric transmission linear encoder
●Response speed: 1.5m/s *7
●Output method: 90°phase differential square wave (compatible with RS-422A)
Refer to the above table for Output Signal pitch and Minimum edge interval
●Contact point: Φ3 carbide ball(Thread: M2.5x0.45) ●Bearing type: Stroke ball bearing
●Protection level: IP66 ●Output cable length: 2m(directly wired from the gage)
●Operating temperature (humidity) :0 to 40 ℃ (20 to 80%RH, with no condensation)
●Storage temperature (humidity) : -10 to 60 ℃ (20 to 80%RH, with no condensation)
●Accessory: No. 538610 Key spanner for contact point replacement (10mm type)
No. 210187 Key spanner for contact point replacement (25/50mm type)
*7: In the case of 50mm stroke type, an over speed error may occur depending on the spindle retraction
amount, if the contact point is released freely after it is retracted.
8. Optional Accessories
●Extension cable(5m) : No. 902434
●Extension cable(10m) : No. 902433
●Extension cable(20m) : No. 902432
●Rubber boot (for 10mm type) : No. 238772
●Rubber boot (for 25mm type) : No. 962504
●Rubber boot (for 50mm type) : No. 962505
If the thrust stem and tightening nut are used, the gage mount fixture needs only Φ9.5 or Φ18 hole to be
drilled, and also the gage can be mounted firmly and easily. (see below.)
●Thrust stem (for 10mm type) :No. 02ADB682
●Tightening nut (for 10mm type) :No. 02ADB682
●Dedicated spanner (for 10mm type) : No. 02ADB683
●Thrust stem (for 25/50mm type) :No. 02ADN371
●Tightening nut (for 25/50mm type) :No. 02ADB692
●Dedicated spanner (for 25/50mm type) :No. 02ADB693
=Example of use=
IMPORTANT
zBefore mounting the trust stem, be sure to secure the stem using the dedicated spanner (No.02ADB683/
No.02ADB693). Excessive force applied between the gage body and stem may cause damage to the
gage.
zM9 x 0.5/M14 x 0.5 screw are sued only for mounting the trust stem. Do not use them for other purposes.
Mitutoyo Corporation
Kawasaki、Japan
Dimension between
hexagonal opposing sides
Thrust stem / Mounting nut
( Optional accessories )
Mounting nut
Dedicated spanner
( Optional accessories )
Thrust stem
( Optional accessories )
LGF-0510L-B
LGF-110L-B
LGF-0525L-B
LGF-125L-B
LGF-525L-B
LGF-0550L-B
LGF-150L-B
LGF-550L-B
Thrust stem set (for 10mm type)
No.02ADB680
Thrust stem set (for 25/50mm type)
No.02ADN370
Fixture width L: within 6 to 10.5mm
Fixture width L: within 10 to 13mm
LGF-0525L-B
LGF-125L-B
LGF-0550L-B
LGF-150L-B
LGF-0510L-B
LGF-110L-B
ΦA
ΦB
Tb (minimum) ⇒ 0.5μm, 1μm, 5μm (resolution)
ΦA
ΦB
Te (minimum)
ΦA, ΦB
ΦA, ΦB
Recommended input circuitLGF output circuit
26LS32 or equivalent
33pF
51Ω
GNDGND
+5V +5V
Key spanner
(for replacing contact points)
Key Way
Contact pointRubber boot
Key WaySpindle
Stem ( A ) ( A )
Contact pointRubber boot
Key WaySpindle
Stem ( A ) ( A )
( Optional accessories )
( Optional accessories )
Thrust stem Dedicated spanner
Mounting nut Thrust stem / Mounting nut
Dimension between
hexagonal opposing sides
For 25mm stroke = (84.1)
For 50mm stroke = (124.9)