AVL F-FEM-DDC User Manual

73
Options
F-FEM-DDC — User’s Guide
5.4.7 Connecting an analog Sensor and using a variable Threshold
Using a voltage source as a variable threshold:
If you have a signal like shown in the figure above, you will need a threshold
voltage other than the default values as written in Tab. 31 on page 67.
This can be done with an external threshold voltage connected to the track- input
(pin 2 or 4) realized either with a voltage source or with an analog output of an
F-FEMs DAC channel. In the second case the threshold value can be varied
dynamically depending on other parameters (eg.: speed, temperature, etc.) from
0-10V. If you need a higher level than 10 V switch the SW2 to a gain of 2 to get a
voltage of 0-20 V.
If your threshold voltage requirement is not so accurate or dynamical as
described above, you can use an external resistor to adjust the default threshold
value to different one like shown in the following figure:
Fig. 51
1
2
J1
5
arbitrary
Sensor/signal
3
4
6
SW1: open
SW2: Gain * 1
or * 2
SW3: internal
supply
CSA
Supply
GND
+ 24 V
Threshold
voltage

AVL F-FEM-DDC Specifications

General

Brand	AVL
Model	F-FEM-DDC
Category	Measuring Instruments
Language	English