User manual - RATEMETER STI-73
Figure 6.3. Two threshold control of the relay/LED outputs
The relay outputs and LEDs (named
R
) can be controlled depend on both - the
current value and the peak value (when peak detection is active) of the input signal.
6.3.1.
One threshold mode
Figure 6.4 presents the principle of relay outputs operation for one threshold mode, and
an example values of other parameters.
Description:
A, B, C, D
- points where measured signal exceeds border values (expected value ± allowed deviation)
B
ON
,
B
OFF
,
D
ON
,
D
OFF
- relays state changes moments: (for
“t on”
> 0,
“t oFF”
> 0)
tA , tB , tC , tD
- time periods while input signal is in zone A or zone B
Figure 6.4.
Principle of LED/relay output operation for one threshold mode
17
“SEt P”
parameter
(expected signal value)
“HYSt”
parameter
(allowed signal
deviation)
measured
signal
displayed value
time
time
time
A
B
C
D
relay state
(
modE
=
on
t on
= 0
t oFF
= 0)
relay state
(
modE
=
on
t on
> 0
t oFF
> 0)
t
A
t
B
t
C
t
D
B
ON
D
OFF
relay state
(
modE
=
oFF
t on
= 0
t oFF
= 0)
relay state
(
modE
=
oFF
t on
> 0
t oFF
> 0)
“t oFF”
parameter
“t on”
parameter
B
OFF
D
ON
time
time
closed
open
a)
b)
c)
d)
e)
open
closed
open
open
closed
closed
“t on”
parameter
“t oFF”
parameter
zone A
zone B
zone B
zone A
zone B
measure
”SEt P” or ”SEt P2” parameter
”HYSt” parameter
state of
relay/LED
i
