TB 9-4920-455-35
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Page
Preliminary instructions......................................
Equipment setup ..................................................
Double interrupter logic test ...............................
Single interrupter logic test ................................
Balance mode test ................................................
Final procedure ....................................................
IDENTIFICATION AND DESCRIPTION
1. Test Instrument
Identification.
This bulletin provides instructions for the
calibration of Vibrex Balance Kit Model B4591, Consisting of Vibrex Tester Model 11, Blade
Tracker, Model 135M-11, and Balance Phazor, Model 177M-6A. The manufacturer's
manual and TM 55-4920-402-13&P were used as the prime data sources in compiling these
instructions. The equipment being calibrated will be referred to as the TI (test instrument)
throughout this bulletin.
a. Model Variations. None.
b. Time and Technique. The time required for this calibration is approximately 2
hours, using the dc and low frequency technique.
2. Forms,
Records, and
Reports.
a. Forms, records, and
reports required for calibration personnel at all
levels are
prescribed by TB 750-25.
b. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. When adjustments are in tables, the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).
3. Calibration
Description. TI
parameters and
performance specifications which
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
Calibrator Model 11 RPM
900
and 1800 rpm at 60 Hz
Double interrupter logic
IPS
equals 0.8 0.08 at 1800 rpm
(Balancer model 177M-6A)
IPS
equals 0.4 0.04 at 900 rpm
Single interrupter logic
0.8
IPS 0.08 at 1800 rpm
(Balancer model 177M-6A)
0.4
IPS 0.04 at 900 rpm
Balance mode
IPS 0.08 at 1800 rpm
0.8
(Strobex model 135M-11)
IPS 0.04 at 900 rpm
0.4
