HT204406 how does the iTune icon present itself onto the dock. ? And how does it play without being requested ?

Question

how does the iTune icon present itself onto the dock. ?
And how does it play without being requested ?

Answer 1

1. The SCB-68 is just a terminal block; it does not measure anything. The measurement is made on the board connected to the SCB-68.
2. Computer-based data acquisistion devices and 480 V motors with solid state speed controls do not "play nice," as the kids say. The connections you are trying to make may well end up with a fried data acquisition board, fried computer, and MOST IMPORTANTLY a fried USER!
Ground loop problems may produce noisy measurements or may destroy all the low current devices (like the computer) in the system.
Signal conditioners are not only to reduce noise but also to provide safe isolation between the high voltage and high power parts of the system and the more sensitive parts.
A thermocouple is a voltage generating device. The measurement system measures that voltage (typically millivolts) and independently measures the temperature of the "cold junction" of the thermocouple. The temperature at the hot junction of the thermocouple is calculated as Temperature(TC voltage difference) - Temperature(cold junction). If currents flow through the TC wires, due to ground potential differences between the motor frame and the computer ground for example, the voltage drop from Ohm's law is added to the TC voltage and will produce temperature errors. TC wire may have significantly higher resistance than wires used for most elelctrical signals so the interfering signal may be greater than the desired signal.
Lynn