Fluke 125 Fluke 125 Users Manual - Page 59

Table 4-2. Tested Signal Properties, Property, Explanation, Table 4-3. Bus Test Screen Indicators

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Table 4-2. Tested Signal Properties Property Explanation 1 VBias CAN-Rec. H-L CAN-Rec. H CAN-Rec. L V High Vpk-pk 2 V-Level High-Bias V-Level Bias-Low CAN-DOM. H-L CAN-DOM. H CAN-DOM. L V Low V-Level pk-pk V-level high V-level low 3 Data Data Baud 4 Rise 5 Fall 6 Distortion Jitter Distortion Overshoot Distortion Amplitude Bias voltage CAN-recessive high to low level voltage CAN-recessive high level voltage CAN-recessive low level voltage High level voltage Peak to peak voltage High level to bias level voltage Bias level to low level voltage CAN-dominant high to low level voltage CAN-dominant high level voltage CAN-dominant low level voltage Low level voltage Peak to peak voltage High level voltage Low level voltage Bit width Baud rate Rise time as % of bit width Fall time as % of bit width Jitter distortion Signal distortion, over- and undershoot Amplitude distortion (AS-i bus) 4 Field Bus Measurements Reading the Screen Table 4-3. Bus Test Screen Indicators : bus activity indicators. Bus activity indicator 1: Q (filled) : voltage measured { (open) : no voltage measured Bus activity indicators 2 and 3: { { (both open) : no activity ÑÑ(blinking) : activity Busy, the test tool is measuring/processing data. No reading available. Test OK. Measurement results are within 80% of allowable range, see figure 4-3. Warning. Measurement results are between 80% and 100% of allowable range, see figure 4-3. Test failed. Measurement results are out of allowable range, see figure 4-3. 4-5

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Field Bus Measurements
Reading the Screen
4
4-5
Table 4-2. Tested Signal Properties
Property
Explanation
1
VBias
CAN-Rec. H-L
CAN-Rec. H
CAN-Rec. L
V High
Vpk-pk
Bias voltage
CAN-recessive high to low level voltage
CAN-recessive high level voltage
CAN-recessive low level voltage
High level voltage
Peak to peak voltage
2
V-Level High-Bias
V-Level Bias-Low
CAN-DOM. H-L
CAN-DOM. H
CAN-DOM. L
V Low
V-Level pk-pk
V-level high
V-level low
High level to bias level voltage
Bias level to low level voltage
CAN-dominant high to low level voltage
CAN-dominant high level voltage
CAN-dominant low level voltage
Low level voltage
Peak to peak voltage
High level voltage
Low level voltage
3
Data
Data Baud
Bit width
Baud rate
4
Rise
Rise time as % of bit width
5
Fall
Fall time as % of bit width
6
Distortion Jitter
Distortion Overshoot
Distortion Amplitude
Jitter distortion
Signal distortion, over- and undershoot
Amplitude distortion (AS-i bus)
Table 4-3. Bus Test Screen Indicators
: bus activity indicators.
Bus activity indicator
1
:
(filled)
:
voltage measured
(open)
:
no voltage measured
Bus activity indicators
2
and
3
:
(both open)
: no activity
(blinking)
: activity
Busy, the test tool is measuring/processing
data.
No reading available.
Test OK. Measurement results are within 80%
of allowable range, see figure 4-3.
Warning. Measurement results are between
80% and 100% of allowable range, see figure
4-3.
Test failed. Measurement results are out of
allowable range, see figure 4-3.