3500/42 Operation and Maintenance
Maintenance
121
S
max
Amplitude
Note
The Keyphasor must be triggering and have a valid rpm value to check this
parameter.
1. Disconnect PWR, COM, and SIG field wiring from the channel pair terminals
on the I/O module.
2. Connect test equipment and run software as described in Section 5.1.5.1
(Test Equipment and Software Setup - Radial Vibration). S
max
requires
input connections to both channel 1 and 2 or channel 3 and 4.
3. Calculate the full-scale voltage using the equation and example shown
below.
Full-Scale Voltage =
(S
max
Meter Top Scale
×
Transducer Scale Factor)
×
1.414
Note
Use the Transducer Scale Factor displayed in the Scale Factor Box on the
Verification Screen.
Example 1:
S
max
Meter Top Scale = 10 mil
Transducer Scale Factor = 200 mV/mil
Full Scale
= (10
×
0.200)
×
1.414
= 2.828 Vpp
For Vrms input:
Vrms = (0.707/2)
×
(Vpp), for a sinewave input
= (0.707/2)
×
(2.828)
= 0.999 Vrms
Example 2:
S
max
Meter Top Scale = 200
µ
m
Transducer Scale Factor = 7,874 mV/mm
= 7.874 mV/
µ
m
Full Scale = (200
×
.007874)
×
1.414
= 2.2267 Vpp
For Vrms input:
Vrms = (0.707/2)
×
(Vpp), for a sinewave input
= (0.707/2)
×
(2.2267)
= 0.7871 Vrms
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