Escort 3004B, 3016B, 3008B user manual Measure of intensity, Connection of the grounding

3Initialisation

4wires wiring :

PT100

You have to choose the input channel type 2, 3 or 4 wires in the Channel set up function.

3.4.4. Measure of intensity

Isolated input module: it is possible to measure intensities with a shunt between the red and black terminals of the considered input.

Non-isolated differential input module: it is possible to measure intensities with a shunt between the "+" and "-" terminals of the considered input.

In this case, choose the "Current" type among the parameters of the considered channel. Connect the measure cables to the terminals of the shunt.

Collected results are directly displayed in Amperes or milli-Amperes according to the range of the considered channel.

3.4.5. Connection of the grounding

For measuring very small voltages, problems of spurious voltages from electromagnetic fields or common mode voltagess become all the more important than the selected sensibility is higher. Thus, it is important that the outer wiring is made correctly.

Causes for such difficulties are various:

-uncertainty about the true origins of the perturbing voltages and impedances when they are generated

-uncertainty about the spurious capacitances of the circuits and wiring

-no access to the injection point of the common mode voltage of the network that provides the signal to register

-non-conformity of some appliances with the current norms

-sometimes even ignorance of the source impedances of the signal to register

YOU SHOULD ABIDE BY THE FOLLOWING INSTRUCTIONS

1/ The mechanical ground of every appliances should be linked to the earth.

The mechanical ground of the recorder is linked to the earth through the mains cable.

However, if the other appliances in the system are not equipped the same way, youd better gather their mechanical ground with the ground of the recorder: you can access it through a union liner at the rear of the appliance.

Page 3.6