Operation Manual

5-8
IM 1F5B2-01E
SDBT or
SDBS distributor
1- to 5V DC
input
To recorder or
indicating meter
To power
supply
ULTRA YEWFLO
Power supply terminal
+
-
+
PULSESUPPLY
Figure 5.6-2 Wiring of ULTRA YEWFLO (Analog Output)
5.7 Pulse Output
■ ULTRA YEWFLO provides a pulse output through transistor contacts using three-
wire transmission. The contacts are rated at a maximum of 30 V DC and 120 mA
DC.
■ The low level is 0-2 V.
■ The range of the pull-up resistance is as noted below.
■ The pulse output is connected to such devices as an electronic counter. See Figure
5.6-3.
■ No communication is possible over a transmission line.
■ Communication via the amplifier board is always possible irrespective of the wiring
conditions.
ULTRA YEWFLO
Power supply terminal
Electronic
counter
R (1 kΩ Typ)
Three-wire shielded cable
(resistance of conducting wire: 50 Ω maximum)
+
-
+
PULSESUPPLY
Figure 5.6-3 Wiring of ULTRA YEWFLO (Pulse Output)
• Range of Pull-up Resistance
The range of the pull-up resistance for pulse output is restricted for reasons of the
rated current and output frequency, as shown below:
E (V)
ⱕⱕR (kΩ)
120
0.1
C (µF) × f (kHz)
where
E=pull up supply voltage
C=cable capacitance
f=frequency of pulse output