
3500/42 Operation and Maintenance
Maintenance
115
1X Phase
Note
If the test equipment is not capable of changing the phase output to a known
value, use the following procedure. If your test equipment can change the
phase output to a known value, use the procedure on page 116.
1. Disconnect PWR, COM, and SIG field wiring from the channel 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). Set the Keyphasor
multiplier/divider so that the multiply setting is one and the divide setting is
one.
3. Attach one channel of a two channel oscilloscope to the vibration signal
buffered output and attach the other channel to the associated Keyphasor
®
signal buffered output and observe the two signals simultaneously.
4. Measure the phase. 1X Phase will be measured from the leading edge of the
Keyphasor
®
pulse to the first positive peak of the vibration signal. See the
example below (on page 115) which illustrates a phase of 45
°
. Observe the
1X Phase bar graph display and Current Value Box; it should read
approximately what was measured above.
Example:
1X = one cycle of vibration signal per shaft revolution.
5. Disconnect the test equipment and reconnect the PWR, COM, and SIG field
wiring to the channel terminals on the I/O module. Verify that the OK LED
comes on and the OK relay energizes. Press the RESET switch on the Rack
one cycle
0
°
360
°
Phase
Lag= 45
°
1X
Vibration
Signal
Time
Keyphasor
Signal
one shaft revolution
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