Fluke 225C User Manual - Page 86

Profibus PA/31.25 kBit/s, Table 8. Profibus PA Tested Signal Properties

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Fluke 19xC-2x5C Users Manual Profibus PA/31.25 kBit/s Default probe setting 10:1. Use the Fluke 10:1 probe. 1 Connect the red probe to test tool input A 2 Connect the probe ground lead to the PA bus 3 Connect the probe tip to the PA bus + DATA + DATA - Figure 42. Profibus PA Measurement Connections Warning Profibus PA is optimized for process control with focus on explosion safety. When planning tests on this bus type, make sure the proper safety rules are adhered to! Table 8. Profibus PA Tested Signal Properties Signal V-Level Bias V-Level Data Rise Fall Jitter Signal Dist. Noise-HF Noise Noise-LF Description Bias voltage level Peak-peak voltage Bit width Rise time as % of bit width Fall time as % of bit width Jitter distortion Signal distortion High Frequency noise >39.1 kHz Mid Frequency noise 7.8 -39.1 kHz Low Frequency noise < 7.8 kHz Note The bus normally has continuous data traffic. 76

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Fluke 19xC-2x5C
Users Manual
76
Profibus PA/31.25 kBit/s
Default probe setting 10:1. Use the Fluke 10:1 probe.
1
Connect the red probe to test tool input A
2
Connect the probe ground lead to the PA bus -
3
Connect the probe tip to the PA bus +
DATA +
DATA -
Figure 42. Profibus PA Measurement Connections
Warning
Profibus PA is optimized for process control
with focus on explosion safety.
When planning tests on this bus type, make
sure the proper safety rules are adhered to!
Table 8. Profibus PA Tested Signal Properties
Signal
Description
V-Level Bias
Bias voltage level
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.
Signal distortion
Noise-HF
High Frequency noise >39.1 kHz
Noise
Mid Frequency noise 7.8 -39.1 kHz
Noise-LF
Low Frequency noise < 7.8 kHz
Note
The bus normally has continuous data traffic.