TB 43-0001-61-3
pursuing the acquisition of two new items. They are the Test Set, Radio: AN/PRM-35
and the Generator, Signal: SG-1364/U. Bid sample evaluations get underway in April
with purchasing contracts likely in the second quarter of FY 07.
Electronic Equipment Test Facility
Provide updated guidance regarding Electronic Equipment Test Facility (EETF) critical
assets.
Reference: USATA Special Advisory - Electronic Equipment Test Facility
General: The EETF continues to be the Army's support system to test and repair the
APACHE Helicopter. The following two TMDE components at each EETF are critically
scarce.
Calibrator, AC 6625-01-100-6196 (referred to in TB 43-180 as 5200A, 6625-01-063-
6325)
Calibrator, DC 6625-01-134-6629 (referred to in TB 43-180 as 3330B, 6625-00-003-
7031)
Guidance: Any EETF's 5200A or 3330B that fail calibration and can not be repaired
locally must be returned to its owner with explicit instructions to send the instrument
to the Depot repair program at Tobyhanna Army Depot (BY6). Condition coding of the
instruments do not warrant the items to be sent to DRMO and misdirection could
jeopardize the EETF lifecycle.
POC within USATA is Mr. Eddy Copeland, (256) 842-2700, DSN 788-2700, or Mr. Bob
Branin, USATA Staff Office, (256) 955-8818, DSN 645-8818
Tegam System II Microwave Power Calibrations
The recent fielding of the Tegam System II microwave power calibration system at
Reference has generated many questions from System II users regarding uncertainties
and test uncertainty ratios (TURs). The situation is complicated even more by the fact
that power standards and sensors calibrated by the system are used to adjust the
precision power reference outputs on RF power meters to extremely tight tolerances. A
good example is the + 0.7% power amplitude adjustment requirement of the HP model
437B power meter reference at 50 MHz. Other instruments such as the new Agilent
model 4419B power meter have even tighter adjustment tolerances.
These are examples of TMDE that cannot be supported at the traditional 4:1 test
uncertainty ratio. With improved technology, better instrumentation, and tighter
performance specifications, the 4:1 requirement is not applicable for some of our
standards and TMDE. The industry is improving faster than NIST and the metrology
community can develop the standards and techniques necessary to provide the lower
uncertainties we would like to see. Also, we are pushing the "theoretical" limits on how
