Specifications

2
Suitable for in-line use
Suitable for close-pitched applications
Measurement principle
The gage head processes internally
detected signals and outputs square-wave
signals as shown below. These operating
signals, which are square waves having
a phase difference of 90 degrees, are
equivalent to RS-422A signals, allowing
for the independent use of the gage head.
However, certain models (LGD and LGS),
do not output square-wave signals but
generate Digimatic code (SPC) output in
order to identify the measurement position.
Output
1. A range of models available
The gage heads described offer five measuring ranges (5, 10, 25, 50 and 100mm) and six resolution
settings (0.01, 0.005, 0.001, 0.0005, 0.0001 and 0.00001mm) to enable the choice of gage to be closely
matched to the application requirements. Various output modes are also available, including differential
square-wave, Digimatic code (SPC) and sine wave.
2. Suitable for production line use
The gage heads offer superb durability and environmental resistance, making them ideal for in-line
measurements. Durability is ensured by strong construction and linear ball bearings in the slider unit
(except for models LGS and LGB), which are designed to last up to 10 million vertical spindle strokes
(according to Mitutoyo’s internal tests). Moreover, excellent dust/water protection (IP66) is provided for
effective use in severe in-line environments (model LGF and others).
3. High-density design
The slender design of the standard gages enables installation in confined spaces or where the application
demands close-pitched gaging. Slim-line models with outside diameters of 8mm are also available for
measurements in spaces of 10mm or less. Gages come in two different cable arrangements — vertical
and horizontal — to suit the type of fixture used.
4. Simple mounting
All gages can be mounted by the plain section of the stem using the split-clamp method. Alternatively,
some gages are threaded at the bottom and so can also be installed simply by drilling a hole of the
appropriate size in a fixture and clamping the gage with a plain nut or by using a thrust stem (see page
33). Gages with a stem threaded at the top can be mounted using a thrust stem as an alternative to the
split clamp.
5. A choice of output format
The gage head display units offer a range of output formats to best match the application requirements:
I/O, BCD, RS-232C and Digimatic code (SPC) types are available. The EH/EV counter has an RS link
function to be connected with multiple counters for multi-gage measurement (see page 36).
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The gage heads mainly use transmission-
type photoelectric linear encoders, as
shown below. In this type, the light source
(LED) and the detector element (photodiode)
face each other with the main scale
and index scale (20μm pitch) positioned
between them.
As the scale moves with respect to the
detector, the intensity of the light passing
through the window in the index scale
varies constantly. At this time, two
synchronized sine-wave signals having a
relative 90-degree phase difference are
output. These signals are then amplified
and split electrically (with additional
waveforms inserted) and output as 0.1μm,
0.5μm, 1μm or 5μm square-wave signals.
Features
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