Field of application
K148 A01681_03_X00_04 HBM: public 9
4 Field of application
When measuring mechanical deformations electrically with strain gauge trans
ducers, it is interesting to know the precise correlation between the mechanical
quantity acting on the transducer and the corresponding electrical display at
the end of the measurement chain.
To achieve this, use the K148 calibration unit instead of a strain gauge trans
ducer. It delivers defined, electrical signals and simulates the effect of the me
chanical quantities acting on a strain gauge transducer.
The K148 calibration unit is designed for connecting single-channel measuring
amplifiers as well as multi-channel amplifiers with up to eight channels in a full-
bridge circuit. Six-wire circuitry is used for connection.
Single‐channel amplifier
Eight‐channel amplifier
Strain gauge full bridge 350
Ohm
direct
Switched in
series
Single
Channel
1
2
3
4
5
6
7
8
K148
Single-channel amplifiers are connected directly, the channels of multi-channel
amplifiers are switched through serially, internally.
The calibration unit has a strain gauge equivalent resistance of 350 ohms.
It can be operated via a USB interface or via the serial interface with a com
puter or controlled manually.
The K148 works in a frequency range of 225 Hz to 600 Hz with an accuracy
class of 0.0025; with DC and a CF u600....5000 Hz, the accuracy class is
0.025%. In DC it makes sense to zero the measurement values to eliminate
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