Page 278 - TesaKatalogen

E le c t r o n i c L e n gth M easu r i n g E q uipme n t

Multiple application possibilities
TESA probes have been designed for applications for use with instruments for internal and external
measurements, measuring supports or special measuring systems. For such applications, different
probe executions can be supplied such as probes with an axial measuring bolt or parallel guides, re-
fer also to angle lever probes. In addition, there are also special executions developed for multi-gau-
ging inspection fixtures or ‘in-process’ inspection stations, which enable an economy in the number
of components needed. Apart from a few exceptions, the measuring operations executed are always
comparative measurements with reference to a standard such as a gauge block, a setting ring or any
other component that can be used as a master.
The measurements are extremely accurate. Bias error influence is negligible compared to the budget
for measuring uncertainty given the fact that the comparison is being established between two
almost practically equal values
Random errors also lose their influence in a procedure where the display setting is made under the
same conditions as the subsequent probing measurements
TESA measuring instruments are equipped with an analogue and/or digital display, depending on the
model.

Internal processing of measured values
Depending on the application, the electrical signals are processed in different ways within the ins-
trument.
Mathematical Data Processing
The signals can be processed with positive polarity sign as well as negative polarity sign. The use of
a single probe enables single measurement of internal or external dimensions while the combination
of the signals of two probes produces either a "sum measurement" or a "difference measurement".

Value Storage
The storage of measured values in the memory ensures the reliability of dynamic measuring cycles.
The characteristic values are the two minimum and maximum values or the difference between the
smallest and largest value acquired while measuring form or position errors.
Classification of Values
The measured values can be classified after the entering of limit deviations. In this case, the control
signals can be used by an external peripheral unit.

Components of a TESA inductive probe Sensivity of TESA half-bridge probes
for TESA electronic interfaces and
electronic displays

1 Mounting stem or probe
housing
2 Coil system
3 Element mounted between 8

the ferromagnetic core 3 1 6
5 9
and the measuring bolt for 4 10
the correction of varying 2
coefficients of thermal
expansion 11 12

9 4 Force compression spring 15
5 Anti-rotation guiding
2 10 system

11 3 6 Ball cage Sensitivity 73,75 mV/V/mm
1 7 Setting element for
limiting the measuring
bolt travel
4 8 Probe insert 29,50 mV/V/mm
12 9 In-between tube being (GT 61, GT 62)
5 part of the coil system 7,375 mV/V/mm
6 13 10 Ferro-magnetic core (GT 61S, GT 62S)
49,17 mV/V/mm
11 Force spring stop (FMS 130, FMS 132)
12 Ball-bearing guiding tube
7 13 Measuring bolt All given values are valid for the following
reference conditions :
14 14 Sealing bellow
15 Mechanical device for Drive voltage 3V
zero-setting Drive frequency 13 kHz
Adjustment load 2 kΩ
8

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