Operation Manual EMGZ 490
15.12.2015
12
B ) Overflow/Underflow Test
Over- or underflow are determined by using the output (calculated with the gain factor).
If the output exceeds the maximal possible value, there is an overflow. If it drops below
the minimal value, there is an underflow.
Test Rules:
The output voltage varies between 0 and +10 V. For the test a hysteresis of ±10 digits is
applied, in order to prevent error bits to respond at any small overflow or underflow. The
overflow is thus triggered at the output reaching the theoretically calculated value
10.05V. For the underflow applies value of -0.05V. Upon reaching one of these limits,
the corresponding Status Bits are set. The Status Bits are re-set as soon as the output
enters the range 0.05V and 9.95V.
4.6
Description of Signal-LEDs
LED
Meaning
Power
Amplifier supply switched on
LNK 1
Ethernet cable 1 connected with
other station
ACT 1
Blinking, if data communication on
Ethernet connection 1 active
LNK 2
Ethernet cable 2 connected with
other station
ACT 2
Blinking, if data communication on
Ethernet connection 2 active
Fig. 4: Signal LEDs on EMGZ 490.R and EMGZ 490.W
