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TB 9-6625-2099-35
CHANGE 1
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
DUAL TRACE AMPLIFIERS AM-6880/U
(TEKTRONIX, TYPE 7A18),
TEKTRONIX, TYPES 7A18A, 7A18A W/OPTION 6,
AND AM-6785/U (TEKTRONIX, TYPE 7A26)
Headquarters, Department of the Army, Washington, DC
30 October 2002
Approved for public release; distribution is unlimited.
TB 9-6625-2099-35, 19 July 2002, is changed as follows:

1. Remove old pages and insert new pages as indicated below. New or changed
material is indicated by a vertical bar in the margin of the page.

Remove Pages Insert Pages
1 thru 6 1 thru 6
11 thru 14 11 thru 14

2. File this change sheet in front of the publication for reference purposes.
By Order of the Secretary of the Army:

0224712
Distribution:
To be distributed in accordance with IDN 342232, requirements for TB 9-6625-2099-35.
*TB 9-6625-2099-35
CALIBRATION PROCEDURE FOR
DUAL TRACE AMPLIFIERS AM-6880/U
(TEKTRONIX, TYPE 7A18),
TEKTRONIX, TYPES 7A18A,
7A18A W/OPTION 6, AND AM-6785/U
(TEKTRONIX, TYPE 7A26)
Headquarters, Department of the Army, Washington, DC
19 July 2002
Approved for public release; distribution is unlimited
REPORTING OF ERRORS AND RECOMMENDING IMPROVEMENTS
You can improve this manual. If you find any mistakes or if you know of a way to improve these
procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to
Publications and Blank Forms), or DA Form 2028, directly to Commander, U.S. Army Aviation
and Missile Command, ATTN: AMSAM-MMC-MA-NP, Redstone Arsenal, AL 35898-5000. A
reply will be furnished to you. You may also provide DA Form 2028 information to AMCOM via
e-mail, fax, or the World Wide Web. Our FAX number is: DSN 788-6546 or Commercial 256-
842-6546. Our e-mail address is: [email protected]. Instructions for sending an
electronic 2028 may be found at the back of this manual. For the World Wide Web, use:
https://amcom2028.redstone.army.mil.

Paragraph Page
SECTION I. IDENTIFICATION AND DESCRIPTION
Test instrument identification ............................ 1 2
Forms, records, and reports ............................... 2 2
Calibration description ....................................... 3 2
II. EQUIPMENT REQUIREMENTS
Equipment required ........................................... 4 3
Accessories required........................................... 5 3
III. CALIBRATION PROCESS FOR AM-6880/U
(TEKTRONIX, TYPE 7A18) AND
TEKTRONIX, TYPES 7A18A AND 7A18A
W/OPTION 06
Preliminary instructions .................................... 6 4
Equipment setup................................................ 7 4
Vertical gain ................................................ 8 5
Risetime ................................................ 9 8
Final procedure ................................................ 10 10

__________
*This bulletin supersedes TB 9-6625-2099-35, dated 29 March 1993, including all changes. CHANGE 1
TB 9-6625-2099-35
Paragraph Page
IV. CALIBRATION PROCESS FOR AM-6785/U
(TEKTRONIX, TYPE 7A26)
Preliminary instructions .................................... 11 10
Equipment setup................................................ 12 10
Vertical gain ................................................ 13 11
Risetime ................................................ 14 16
Final procedure ................................................ 15 18

SECTION I
IDENTIFICATION AND DESCRIPTION

1. Test Instrument Identification. This bulletin provides instructions for the
calibration of Dual Trace Amplifiers, AM-6880/U (Tektronix, Type 7A18), Tektronix,
Types 7A18A, 7A18A w/Option 06, and AM-6785/U (Tektronix, Type 7A26). The
manufacturer's manuals 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. Variations among models are described in text.
b. Time and Technique. The time required for this calibration is approximately 1
hour, 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
adjustments. 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.
Table 1. Calibration Description
Test instrument
parameters Performance specifications
AM-6880/U (Tektronix, Type 7A18), Tektronix, Types 7A18A, and 7A18A w/option 06
Vertical gain Range: 5 mV/div to 5 V/div
Accuracy:

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