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Multi-Channel Shunt Scaling

For MX1615B-R modules where the scaling mode is shunt resistor, this dialog will be used to perform shunt scaling. Furthermore, we are currently restricting shunt scaling to the no sense lines input modes. For these channels, the row will be highlighted in green to indicate that the channel is to be experimentally measured. This is just an informational message and has not impact on validations or test runs.

The sensor scaling multi-channel digital meter displays the current values of the selected channels including:

ClosedScreenshot

Initially, the readout will display the current reading of the channel(s), as per the parameters defined, but with the following shunt scaling defaults:

There are three buttons, labeled ZERO, INSTALL and MEASURE. When the test is initially started, all shunts will be removed, the current readings displayed, and the zero button enabled. The install and measure will be grayed out at this time.

The user will select the zero button as the first step in completing the shunt scaling. It will proceed to collect readings for these unshunted values for all channels selected. These unshunted values will then be used to set the zero offset and re-start another test with these new parameters. Once the test has started, the readings should be close to zero.

At this time, the Install button will be enabled as well as the ZERO button. The user can repeat the balance or proceed to install shunts by clicking the install button. If the install button is pressed, the shunts will be installed as per the polarity defined on each channel. The zero and install buttons will be disabled and the measure button will be enabled.

It is recommended that the user wait until such time that the installed shunts readings stabilize before selecting to measure. The shunts will cause a spike that results in “ringing” of the readings due to the signal conditioner front end filtering and digital filtering. This can easily be seen in the digital readout display. At that time, the measure button can be clicked.

Now that shunts have been installed and readings stabilized, the measure button can be clicked to record the shunted values. These unshunted and shunted values measured will populate the electrical zero and electrical span respectively in the setup configuration. The prerun balance offset will be set to zero.

The shunt deviation can then be computed.

NOTE
For the meter to show accurate readings, the system starts a background test run for the duration of the digital display. No other digital displays or test runs can be started.

NOTE
MX modules output overflow values when no suitable connector is found. This is represented by a series of "+" characters on the display.

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