Fluke 190 [87/159] Profibus dp rs 485

Using The Bushealth Function

Input Connections and Tested Signals

Profibus DP/RS-485

Default probe setting 10:1. Use the Fluke 10:1 probes.

1 Connect the red probe to the test tool input A

and the grey probe to input B.

2 Connect the ground lead of the input A probe to

the DP bus RxD/TxD N (-)

3 Connect the ground lead of the input B probe to

the DP bus cable shield.

4 Connect the probe tip of both probes to the DP

bus RxD/TxD P (+)

DATA

DATA -

DATA GND

Figure 43. Profibus DP Measurement Connections

Table 9. Profibus DP Tested Signal Properties

Signal Description

V-Offset

V offset

V-Level Peak-peak voltage

Data Bit width

Rise Rise time as % of bit width

Fall Fall time as % of bit width

Jitter Jitter distortion

Signal Dist.

Overshoot

Signal distortion (Manchester

decoding, default setting)

Overshoot (NRZ decoding, can be

selected via limit setup)

Note

The bus normally has continuous data traffic.