DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

CHANGE 2

DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

CALIBRATION PROCEDURE FOR

OSCILLOSCOPE AN/USM-296A

(NSN 6625-00-115-9201)

Headquarters, Department of the Army, Washington, DC

12 December 1985

TB 11-6625-2713-50, 29 December 1978, is changed as follows:

Page 1, Reporting of Errors. Change address to read "Commander, U. S. Army TMDE

Support Group, ATTN: AMXTM-LPE, Redstone Arsenal, AL 35898-5400."

Paragraph 2a. In lines 3 and 5, change "TM 38-750" to read "TB 750-25."

Page 4, paragraph 9a(5). Change "CH2" to read "CH1."

Paragraph 9a(6). Change "channel 2" to read "CH1."

Paragraph 9a(7) is superseded as follows:

(7) Set TI VERTICAL MODE switch to CH2 and connect digital voltmeter (A3) to

junction of A2A3R9 and A2A3R20 (fig. 2) and chassis ground. If digital voltmeter does not

indicate zero voltage ±50 mV, perform b(1) below.

Page 6, table 4. In line 5 u nder maximum column, change "0.22846" to read "0.28846."

Page 12, paragraph 22b is superseded as follows:

b. When all parameters are within tolerance, annotate and affix DA Label 80 (U.S.

Army Calibrated Instrument). When the TI receives limited or special calibration,

annotate and affix DA Label 163 (U.S. Army Limited or Special Calibration). When the TI

cannot be adjusted within tolerance, repair the TI in accordance with the maintenance

manual. When repair is delayed for any reason or the TI cannot be repaired with local

resources, annotate and affix DA Form 2417 (U.S. Army Calibration System Rejected

Instrument) and inform the owner/user accordingly in accordance with TB 750-25.

PIN: 015255-002