Siemens Bently Nevada 3500 Proximitor - Page 32

Chapter 3 — Maintenance and Troubleshooting
15
Scale Factor Verification
1
Compensate for mechanical
backlash and adjust the spindle
micrometer for electrical zero.
2
Adjust gap to electrical zero by
moving the probe.
3
Compensate for mechanical
backlash in the micrometer and
adjust to the start of the linear
range.
4
ISF
Vdc Vdc
0.25
n (mV / m)
n - 1 n
µ =
−
ASF
Vdc Vdc
2
(mV / m)
250 m 2250 m
µ
µ µ
=
−
ISF
Vdc Vdc
0.01
n (mV / mil)
n - 1 n
=
−
ASF
Vdc Vdc
0.08
(mV / mil)
10 mil 90 mil
=
−
Adjust
Micrometer
to...
Record
Voltages
Calculate Scale Factor
n
µm
n
or mil
n
Vdc
n
ISF
n
(Incremental
Scale Factor)
ASF
(Average
Scale Factor)
1 250 10 ________
2 500 20 ________ ________
3 750 30 ________ ________
4 1000 40 ________ ________
5 1250 50 ________ ________
6 1500 60 ________ ________
7 1750 70 ________ ________
8 2000 80 ________ ________
9 2250 90 ________ ________ ________
Multimeter
-3.00
±
0.1 Vdc
460
µ
m
or
18 mil
500
µ
m
or
20 mil
500
µ
m
or
20 mil
200
µ
m
or
8 mil
250
µ
m
or
10 mil
Increments:
250 µm
or
10 mil
Multimeter