R&S
TSMX-PPS2
Getting Started
Getting Started 1515.7236.02 - 02
21
4.5.2.1 Speed Pulse Signal
This signal is mandatory for using the ADR function. The signal should fulfill the
following recommendations:
•
signal level range for high level: 3.5 V < Level < 15 V
•
input frequency range: 0 Hz < Frequency < 2 kHz
•
0 Hz of the speed signal must be equal to a speed of 0 km/h
•
speed signal should origin from the rear (not steered) wheel
The speed signal is normally available in the radio slot of the vehicle.
4.5.2.2 Direction Signal
The direction signal is optional and only improves the results of the DR algorithm. As
the forward/backward direction signal is not available in all vehicles, try to make use of
the reverse gear light signal.
•
Valid Signal Level Range for high level: 3.5 V < Level < 15 V
•
Level > 3,5 V -> backward direction
4.5.3 Sync Cable
•
The Sync Cable (SMA -> BNC) is part of the delivery (see
"Accessory
List"
).
The precision time pulse is available on the PPS port and used for synchronizing
external measurement equipment with the GPS time.
This port is normally connected to the trigger input of the R&S TSMU scanner (see
). If not used this port may be left open.
The time delay for the time pulse strongly depends on the connected load capacity on
the PPS port and this is application specific. For synchronizing R&S TSMU radio
network scanners this does not harm as only the relative relationship of the pulses is
important.
Users with an absolute requirement for the pulse signal are able to configure a
dedicated time shift using u-center software (see section
).
Load capacity
Typical delay (approximately)
15 pF
0.6 – 3.7 ns
30 pF or 50 pF
1 – 4.5 ns
Table 4-1: Typical delay of the PPS OUT pulse
