SECTION II EQUIPMENT REQUIREMENTS - TB-9-4920-455-350003

SECTION I IDENTIFICATION AND DESCRIPTION - TB-9-4920-455-350002

TB-9-4920-455-35 Vibrex Balance Kit Model B4591 Consisting of Vibrex Tester Model 11 Blade Tracker Model 135M-11 and Balance Phazor Model 177M-6A Manual
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TB 9-4920-455-35

SECTION II

EQUIPMENT REQUIREMENTS

4. Equipment Required. Table 2 identifies the specific equipment to be used in this

calibration procedure. This equipment is issued with Secondary Transfer Calibration

Standards Set AN/GSM-286, or AN/GSM-705. Alternate items may be used by the

calibrating activity. The items selected must be verified to perform satisfactorily prior to

use and must bear evidence of current calibration. The equipment must meet or exceed the

minimum use specifications listed in table 2. The accuracies listed in table 2 provide a four-

to-one ratio between the standard and TI. Where the four-to-one ratio cannot be met, the

actual accuracy of the equipment selected is shown in parenthesis.

5. Accessories Required. The accessories required for this calibration are common

usage items issued as indicated in 4 above, and are not listed in this calibration procedure.

All peculiar accessories are supplied with the TI.

Table 2. Minimum Specifications of Equipment Required

Manufacturer and model

Common name

Minimum use specifications

(part number)

CALIBRATOR

900 and 1800 rpm at 60 Hz

Chadwick-Helmuth, Model 11

DC POWER SUPPLY

Output voltage: 0 to 30 V

HDL, Model LR-10 (LR-10)

Output current: 0 to 5 amps

FREQUENCY COUNTER

Range: 10 to 40 Hz

Fluke, Model PM6681/656

Accuracy: 0.25 Hz

(PM6681/656)

1Supplied

with the Vibrex Balance Kit, Model B4591.

SECTION III

CALIBRATION PROCESS FOR

CALIBRATOR CHADWICK-HELMUTH, MODEL 11

6. Preliminary Instructions

a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration

process. Personnel should become familiar with the entire bulletin before beginning the

calibration.

b. Items of equipment used in this procedure are referenced within the text by common

name as listed in table 2.

c. Unless otherwise specified, verify the result of each test and, whenever the test

requirement is not met, take corrective action before continuing with the calibration.

Adjustments required to calibrate the TI are included in this procedure. Additional

maintenance information is contained in the manufacturer's manual for this TI and

TM 55-4920-402-13&P.

d. Unless otherwise specified, all controls and control settings refer to the TI.

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