Amphenol Temposonics MH Series Manuale operativo - Pagina 12

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Temposonics

MH Analog

Operating Manual

5. Operation and function

5.1 Filter circuitry (noise)

Any resistor causes for example thermal noise, which is more or less evident at the output of the circuitry if amplified accordingly. Additionally,

external effects such as the supply voltage ripple or electro-magnetic fields in the immediate vicinity can affect the noise spectrum.

To minimize noise, the use of a filter is mandatory with analog measurement. A suitable solution for noise suppression is the following filter with

a limiting frequency of approx. 3 kHz. (noise reduction factor 3.6 - see figure below). The signal delay is within the cycle time and changes the

dynamic behavior only insignificantly.

Sensor with analog output

: Filter at the controller input

Fig.

Please pay attention: The resolution of the sensor output is influenced by the A/D converter of ECU input.

e.g.

8 bit = 256 steps

10 bit = 1024 steps

12 bit = 4096 steps

Signal output characteristic during power up time:

The sensor is ready to run after the power up time.

Within the power up time the output signal is ,high': the indicated value is > F.S.O = Full Scale Output.

Output type

F.S.O

mA (A01)

20 mA

VDC (v11)

4.75 Volt

VDC (v12)

4.50 Volt

VDC (v02)

9.50 Volt

Inrush current / selection of suitable fuse

To select the correct fuse, please pay attention to the maximum current load and response time. The short time inrush current peak must be consid-

ered when the sensor is in power on mode.

Please pay attention to actual valid data sheets and specifications!

+ UB

GND

Output „high"

22 mA

4.85 Volt

4.60 Volt

9.65 Volt

50R

GND

Controller

Input

A / D converter

z.B. 12 bit

4096 steps

GND