TB 9-4920-463-24
Test instrument parameters
Performance specifications
Vibrex tester Models 11 or 11A
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
0.8 IPS r0.08 at 1800 rpm
(Strobex model 135M-11)
0.4 IPS r0.04 at 900 rpm
o
o
Phase
275 10
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; AN/GSM-287; 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)
DC POWER SUPPLY
Output voltage: 0 to 30 V
Elgar, Model DCS40-30EM10
Output current: 0 to 5 amps
(13589313)
Range: 10 to 40 Hz
Fluke, Model PM6681/656
Accuracy: 0.25 Hz
(PM6681/656)
1
VIBREX TESTER
900 and 1800 rpm at 60 Hz
Chadwick-Helmuth, Model 11 or
11A
1Supplied
with the Vibrex Balance Kit, Model B4591 or 8500C/C+.