Maintenance
3500/42 Operation and Maintenance
118
2X 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 119.
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
two.
3. Attach one channel of the 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. 2X 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 118) which illustrates a phase of 90
°
. Observe the
2X Phase bar graph display and Current Value Box; it should read
approximately what was measured above.
Example:
2X = two cycles 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
Interface Module (RIM) to reset the OK LED.
6. Repeat steps 1 through 5 for all configured channels.
one shaft revolution
first cycle
Phase
Lag= 90
°
second cycle
2X
Vibration
Signal
Time
Keyphasor
Signal
0
°
360
°
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
