Fluke 190 [149/159] Tips and hints per bus type

Fluke 19xC-2x5C

Users Manual

A-2

Used Probes and Accessories

Refer to page 2 and 3 of this manual for an overview of

accessories as supplied with the test tool.

For most bushealth measurements the 10:1 probe(s) are

used. To hook up to bus line nodes you can use the

Alligator Clips or Hook Clips that fit on to the probe tip.

TP88 Back Probe Pins (optional) can be used to probe

screw terminals at the wire entry point.

Important. For correct measurements you should

calibrate your probe to match its characteristics to the test

tool. A poorly calibrated probe can introduce

measurement errors. See Chapter 9 ‘Calibrating the

Voltage Probes’ for calibration instructions.

You can use the BHT190 test adapter to measure on

busses that use a DB9 or a M12 connector.

Tips and Hints per Bus Type

AS-i bus

The Actuator-Sensor-Interface (AS-i) is used to control

on/off devices at the factory floor. The bus consists of 2

wires marked + and – that carry a 30 Vdc supply with

superimposed data. The AS-i protocol uses continuous

polling of all devices in a fixed time schedule so that there

is continuous data traffic.

To check AS-i, ScopeMeter Channel A is on and

alternately AC coupled for data or DC coupled to test

30 Vdc. The recommended probe is the Fluke 10:1 probe.

Connect the probe as shown below.

AS-i +

AS-i -

Flat-

Brown

Blue