Hardy HI 6500 Series - Manual (Page 153)

Troubleshooting 143
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mV DC voltage signals are between 0-25 millivolts. Overloads and negative millivolt
readings are not shown as actual readings but 25.5 mVfor over voltage and 0.0 for negative
voltage. You will need to use a multimeter with a 200 or 300mVDC range to view the out
of range voltages.
RTZ (Return to Zero) Test
This check is to see if the scale returns to a zero reading condition when it is empty. Run
this test only when the scale is empty. When the scale is calibrated at the ZERO or
Reference zero, there is a period during which the WEIGHT readings are collected. After
a valid calibration has been completed, the test compares the original weight reading with
collected and current readings. If the difference is more than the combined Motion and the
Zero Tolerance parameters the test will fail.
IT Test
If your system has an Integrated Technician Summing Junction box, the IT test can identify
individual load cell problems up to a maximum of four load cell selections. The dwell
displays are live readings and only available if you have an IT summing junction card, with
a maximum of one JBox and 4 channels. From the front display, select Jbox1.
From the Diagnostics menu, select Integrated Technician.
Sensor Number Indicates which sensor is under test. Using the up or down arrow selects
the target sensor to be tested.Then select the number of load cells to test. and press Do IT
Test. The Dwell test for pass or fail take 30 seconds to settle. Until it settles, it will always
show “fail” when the test is started. If the browser times out during the test, refresh your
browser until the results appear.