Length gauges are distinguished by high accuracy in the submicron range. The Heidenhain -METRO series of length gauges (accuracy grades ± 0.2 µm, ± 0.5 µm and ± 1 µm) are used for precision measurements in laboratories, for vendor inspection and similar tasks, or as position displays for X-Y tables.
Length gauges from the CERTO series provide accuracy grades of ± 0.1 µm and better. These devices are suited for such tasks as gauge-block calibration, but also for the production inspection of high-precision parts.
Length gauges from the SPECTO series provide an accuracy of ± 1 µm.
SPECTO's compact dimensions make it attractive for use in multipoint inspection devices.
|System accuracy||± 1 µm|
|Measuring range||12 mm (0.47 in.)|
|Recommended meas. step||0.5 µm|
|Plunger actuation||Plunger extended by spring (= rest position)|
|Protection (IEC 529)||IP 64|
length gauge for multipoint inspection apparatus. Measuring
range 12 mm, i.e.:
SPECTO's innovative design enables it to provide stable measurements over longer periods of time. SPECTO length gauges are free of drift and need no readjustment.
Length Gauges with Very High Accuracy
|CT 60 Length Gauge||CT 25 Length Gauge|
phase grating on Zerodur® glass ceramic
Coefficient of linear expansion
atherm= (0 ± 0.1) ppm/K
|Grating period||4 µm|
|Output signals||11 µAPP Signal period 2 µm|
± 0.05 µm with length error compensation in the ND 281 display unit
± 0.03 µm with length error compensation in the ND 281 display unit
|Measuring range||60 mm (2.4 in.)||25 mm (1.0 in.)|
|* at 19 to 21 °C; permissible temperature fluctuations during measurement: ± 0.1 K|
CT 60 Length Gauge features a measuring range of 60 mm. It
is used for incorporation into special measuring apparatus, calibrating
and inspecting devices or special purpose machines, for example in
conjunction with the monitoring and control of assembly and adjustment
A CERTO length gauging system comprises:
CT 25 Length Gauge features a measuring range of 25 mm.
The high accuracy and measuring steps of 10 nm and less permit use of the CT 25 in gauge block calibration. Thanks to its generous measuring range — much larger than with inductive length gauges — the number of reference standard blocks required can be reduced significantly.
The total error of the CT 25 over the entire measuring range of 25 mm lies within ± 0.1 µm at ambient temperatures between 19 and 21 °C and with temperature fluctuations of ± 0.1 K during measurement.
When the CERTO is used with length error compensation, e.g., in conjunction with the ND 281 Display Unit, HEIDENHAIN guarantees a total error of ± 0.03 µm over the 25 mm measuring range.