User Manual

Trusted
TM
Speed Monitor IFTA T8846
Issue 2 Apr 10 PD-T8846 24
5. Specifications
5.1. Group VField Power Supply Input Specifications
Parameter Min. Typ. Max. Unit Note
Group Vfield Input Voltage Range
VField (A) and VField (B) Inputs
18 32 Vdc w.r.t. Group VField Return
Maximum Group VField Input Current
VField (A) and VField (B) Inputs
1 A
Table 7 Group VField Power Supply Input Specifications
5.2. Group Speed Input Specifications
Parameter Min. Typ. Max. Unit Note
GROUP VFIELD OUTPUT
Group Vfield output voltage
@ 50mA load current
22.6 Vdc VField input voltages @ 24Vdc
Maximum Group Vfield output current 62.5 mA
GROUP SPEED INPUTS
Open Collector Input
Pull-up resistance to Group Vfield.
2000 Ohms
Maximum Open Collector Input
Voltage
33 V w.r.t. Group VField Return
Open collector Input to
Open collector output resistance.
4990 Ohms
Active Input Bias Voltage output
w.r.t Group VField Return
1.90 Vdc Group Vfield Input = 24Vdc
Differential input resistance
Passive (A) & Passive (B) Inputs
632 Ohms
Maximum Differential Input Voltage
Passive (A) & Passive (B) Inputs
10 V 632 ohm input resistance
Table 8 Group Speed Input Specifications