Balance Measurement
Mode l8500C/8500C+ Operators Manual
5-9
5.3.7 Vibration Units
Vibrations may be displayed in units of velocity (inches per second or IPS, 0-pk) acceleration (g’s or
in./sec
2
), or displacement (mils, DA). Use th
<CHANGE>
soft key to convert the units from one form
to the other. Once this parameter is set, all other displays of vibration data are made in these units. This
parameter is not overridden when a balance chart is selected. One mil equals 0.001in.
5.3.8 Signal Selector Pickup Input Channel
If a Mode l8520C Signal Selector is attached to the 8500C/C+, this field allows you to select the Signal
Selector magnetic pickup or Photocell (azimuth) channel to be analyzed. Use th
<CHANGE>
soft key
to choose the desired channel. See Chapter11 “Model8520C Signal Selector” for a complete
description of this instrument.
NOTE: If a Signal Selector is not attached to the 8500C/C+, this field does not appear.
5.3.9 Signal Selector Velocimeter Channels
If a Signal Selector is attached to the 8500C/C+, this field allows you to choose the Signal Selector
velocimeter channel(s) to be analyzed. Use th
<CHANGE>
soft key to select an operator symbol,
either + (to add signals), or - (to subtract signals), or
ONLY
(to select one channel only). Channels ar
selected by positioning the screen cursor over the channel number to be changed and entering a ne
value from the numeric keypad. See Chapt er11 “Mode l8520C Signal Selector” for a complete
description of this instrument.
NOTE: If a Signal Selector is not attached to the 8500C/C+, this field does not appear.
5.4 Balance Measurement
The manner in which a balance measurement is made greatly depends on the rotor system and balanc
type selected. Before attempting any of the balance procedures explained in this section, be sure that
the selected chart is the correct chart for the target rotor system and that all parameters have been set to
appropriate values. Be sure that all information available through th
CHAR TINFO
soft key has been
read. Follow any directions given there. Also make sure to check the hardware. The power/signal input
cable must be properly secured to its connector at the rear of the 8500C/C+, all cables neatly tied and
dressed, and the appropriate signal input devices (velocimeter, Photocell, and/or magnetic pickup)
correctly mounted and in good working order.
5.4.1 Initiating Strobex Measurement
Strobex balance requires that the Strobex be connected to the 8500C/C+ through the dedicated adapter
at the rear of the unit. A retro-reflective target must also be attached to the target blade grip. Put the
8500C/C+ into Balance mode and make sure the balance type is set to Strobex. With the rotor system
running at the appropriate speed, press
START
. The 8500C/C+ then attempts to acquire a vibration
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