Baumer BA_DACx_800 - Handbuch (Seite 15)

Baumer Electric AG 29/40 www.baumerelectric.com
Frauenfeld, Switzerland DACU/I BA V2.1M
5.3 Setting the measurement ranges
The measurement ranges are selected via the four range inputs (for connection see Section 5.1).
5.3.1 Fix ranges
13 fix ranges from 100pC to 1,000,000pC are available. Select the suitable measurement range
according to the expected charge.
Example (DACU 800):
The intention is to measure a force using a piezo-electric force sensor.
-Sensor sensitivity: -4.2pC/N
-max. force 8kN
The maximum charge is calculated as: pC kN
N
pC
Q 33600 8 2 . 4
max
− = ∗ − =
chosen measurement range (-) 50.000pC/10V
Set Range 2 (Pin 6) input to high (with positive logic)
Comment
The other range inputs must not be connected!
The measurement gives an output voltage of 6.25V on the charge amplifier.
The applied force is calculated as:
kN
N
pC
V
pC
V F 44 . 7 2 . 4 ) (
10
50000 ) ( 25 . 6 = − ÷ − ∗ =
Example (DACI 800):
The intention is to measure a force using a piezo-electric force sensor.
-Sensor sensitivity: -4.2pC/N
-max. force 8kN
The maximum charge is calculated as: pC kN
N
pC
Q 33600 8 2 . 4
max
− = ∗ − =
Chosen measurement range (-) 50.000pC/20mA
Set Range 2 (Pin 6) input to high (with positive logic)
Comment
The other range inputs must not be connected!
The measurement gives an output voltage of 14mA on the charge amplifier.
The applied force is calculated as:
( )
( ) kN
N
pC
mA
pC
mA mA F 44 . 7 2 . 4 ) (
16
50000 ) ( 4 14 = − ÷



 − ∗ − =
5.3.2 Variable range
With the variable range, the measuring chain can be adjusted for any output signal with a known
measured magnitude. Select the suitable measurement range according to the charge to be
expected. Now put the system into operation and set the output signal to the desired voltage value
(DACU 800) or current value (DACI 800) using the range potentiometer.
To do this, the lid of the charge amplifier must be opened.
Baumer Electric AG 30/40 www.baumerelectric.com
Frauenfeld, Switzerland DACU/I BA V2.1M
Range
L0
L1
Arrangement of potentiometer
Example (DACU 800):
The measuring chain should be adjusted for a maximum force to an output voltage of 8V.
-Charge of sensor for maximum force: -200.000pC
Selected measurement range (-) 100.000 – 1.000.00pC/10V
Set input range 0, 2 and 3 (pins 8, 6 and 5) to high (for positive logic)
Comment
Range 1 must not be connected!
Put the system into operation and set the output signal to 8V using the range potentiometer for
maximum force.
Example (DACI 800):
The measuring chain should be adjusted for a maximum force to an output current of 17mA.
-Charge of sensor for maximum force: -200.000pC
Selected measurement range (-) 100.000 – 1.000.00pC/20mA
Set input range 0.2 and 3 (pins 8, 6 and 5) to high (for positive logic)
Comment
Range 1 must not be connected!
Put the system into operation and set the output signal to 17mA using the range potentiometer
for maximum force.