Additional Features
Mode l8500C/8500C+ Operators Manual
5-19
5.6.2.3 Clearing Chart Corrections
Pressing
MORE KEYS
and
SHOW CORR
from the Balance Run Start-up screen displays the correction
factors for the current chart (see Fi gure5-17 on page5-19). The sensitivity factor corrects for vibration
amplitude. It is multiplied by the measured or raw vibration amplitude to obtain the corrected
amplitude. The correction angle corrects for phase angle. It is added to the measured phase angle to
obtain the corrected phase angle. A cleared or uncorrected chart has a sensitivi ty factor of1 and a
correction angle of 12:00, which effectively leaves the raw measurements unchanged.
CLR CORRT
clears the correction.
CLR CORRTN
is a good method for clearing a chart whose status is unknown or
no longer valid. You can then perform a new chart correction to bring the chart up to date.
Figure 5-17. Balance Chart Correction Screen
Press
CANCEL
to quit the Correction screen without clearing the correction.
5.6.3 Using Measurements Only
The Measurements Only chart allows you to see only the balance measurements of vibration amplitud
and phase angle. No balance solutions are ever presented. However, you can easily determine solutions
by hand with the Measurements Only chart and the appropriate paper balance chart from Chadwick-
Helmuth. In addition, the Measurements Only chart can be used to collect data for creating new paper
balance charts for individual systems.
5.6.3.1 Balance Solutions
With the 8500C/C+ in Balance mode, select the Measurements Only chart and begin a Strobex,
magnetic pickup, or Photocell balance operation. If you choose to perform a Strobex balance, an
additional soft key,
<TURNS
[clockwise arrow]
>
, appears on the Balance Mode Start-up screen.
Toggling the
<TURNS
[counterclockwi searrow]
>
soft key indicates the direction of the spinning rotor,
either clockwise or counter-clockwise. Be sure to select the appropriate direction before starting the
balance (see Figu re5-18 on page5-20). When you press the
STOP
key, the 8500C/C+ displays th
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