7ML19985CX01 Milltronics ILE-61 – INSTRUCTION MANUAL Page 9
Span Test
1. Gently push the sensing head moving beam to the right. The LVDT output should
increase steadily until a level of 0.75 to 1.0 V AC is achieved.
2. Gently push the sensing head moving beam to the left. The LVDT output should
decrease steadily until zero is reached and then increase to 0.25 to 0.50 V AC.
3. Ensure the LVDT output always returns to 0.10 to 0.05 V AC, (on the right hand side of
zero), when pressure on the moving beam is released.
Sensing Head Level Test
1. With the voltmeter still connected to the LVDT output, hang the test weight directly
off the sensing plate.
2. Observe the display value does not change by more than 0.01 V AC.
Note: The LVDT core must not contact the inside of the LVDT over the range of
core travel. The actual LVDT core travel during this procedure is less than 3 mm
(1/8").
Note: If the change is greater than 0.01 V AC, adjust the sensing head level until
the change with and without the test weight on the sensing plate is less than
0.01 V AC. Remove the test weight and readjust the LVDT output zero, if necessary.
If this procedure is performed after the integrator is calibrated, a new integrator
zero and span calibration, span adjust, and Factoring (if required) should be
performed.
0 . 7 5 0
1 . 0 0 0
0 . 1 5 0
0 . 0 5 0
0 . 0 1 5
0 . 5 0 0
to
to
to
changes < 0.01 V AC
test weight
sensing plate
7ML19985CX01.book Page 9 Thursday, September 18, 2003 12:15 PM
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