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*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 256842-6546. Our e-mail address is: [email protected]. Instructions for sending an electronic 2028 may be found at the back of this manual immediately preceding the hard copy 2028. For the World Wide Web, use: https://amcom2028.redstone.army.mil.

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

Page 2 2 2 3 3

II.

III.

6 7 8 9 10

4 4 5 8 10

__________ *This bulletin supersedes TB 9-6625-2099-35, 29 March 1993.

TB 9-6625-2099-35
Paragraph IV. CALIBRATION PROCESS FOR AM-6785/U (TEKTRONIX, TYPE 7A26) Preliminary instructions .................................... Equipment setup................................................ Vertical gain....................................................... Risetime............................................................. Final procedure.................................................. 11 12 13 14 15 Page 10 10 11 16 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: Within 2% with gain adjusted at 10 mV/div Risetime Accuracy: 7900 series, 4.7 ns (75 MHz) w/oscilloscope 7800 series, 4.7 ns (75 MHz) 7700 series, 4.7 ns (75 MHz) 7600 series, 5.0 ns (70 MHz) 7500 series, 5.8 ns (60 MHz) 7400 series, 7.0 ns (50 MHz)

2

TB 9-6625-2099-35
Table 1. Calibration Description - Continued Test instrument parameters Vertical gain Risetime w/oscilloscope Performance specifications AM-6785/U (Tektronix, Type 7A26) Range: 5 mV/div to 5 V/div Accuracy: Within 2% with gain adjusted at 10 mV/div Accuracy: 7900 series, 1.8 ns (200 MHz) 7800 series, 1.9 ns (180 MHz) 7700 series, 2.3 ns (150 MHz) 7600 series, 3.5 ns (100 MHz) 7500 series, 3.9 ns ( 90 MHz) 7400 series, 5.8 ns ( 60 MHz) Aberrations: +4% or -4% and 6% p-p of pulse amplitude

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 Reference Standards Set, AN/GSM-286. 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 accessories issued as indicated in paragraph 4 above and are not listed in this calibration procedure. The following peculiar accessory is also required for this calibration: Extender, Tektronix, Type 067-0589-00, and Standardizer 5-80 pF, APN 7916146.
Table 2. Minimum Specifications of Equipment Required Minimum use Manufacturer and model Specifications (part number) Volts out: John Fluke, Model 5820A, Range: 20 mV to 20 V at 1 kHz (5820A-5C-GHZ), MIS-38938 Accuracy: �0.5% Square wave capabilities: Frequency: 1 kHz to 1 MHz Amplitude: 30 mV to 2.5 V Aberrations: �2% Risetime: 0.45 ns or less Compatible with TI and supplied by owner Compatible with TI and supplied by owner

Common name OSCILLOSCOPE CALIBRATOR

OSCILLOSCOPE TIME BASE

Tektronix, Type 7000 series (7000 series) Tektronix, Type 7B series (7B series)

3

TB 9-6625-2099-35 SECTION III CALIBRATION PROCESS FOR AM-6880/U (TEKTRONIX TYPE 7A18) AND TEKTRONIX, TYPES 7A18A AND 7A18A W/OPTION 06 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 results 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 manuals for this TI. d. Unless otherwise specified, all controls and control settings refer to the TI. 7. Equipment Setup WARNING HIGH VOLTAGE is used or exposed during the performance of this calibration. DEATH ON CONTACT may result if personnel fail to observe safety precautions. REDUCE OUTPUT(S) to minimum after each step within the performance check where applicable. a. Remove protective cover from TI only when necessary to make adjustments. Replace cover after completing adjustments. b. Remove the left side panel from the oscilloscope and install TI into oscilloscope left vertical compartment and time base into horizontal right compartment. c. Connect oscilloscope to a 115 V ac power source. Energize oscilloscope and allow at least 20 minutes for warmup. d. Position oscilloscope controls as listed in (1) through (3) below: (1) Press VERT MODE/LEFT pushbutton. (2) Press TRIG SOURCE/VERT MODE pushbutton. (3) Adjust INTENSITY, FOCUS, READOUT, and GRAT ILLUM controls as desired. e. Position TI controls as listed in (1) through (7) below: (1) DISPLAY MODE switch to CH 1.

4

TB 9-6625-2099-35 (2) TRIGGER SOURCE switch to MODE. (3) CH 2 POLARITY switch to +UP. (4) CH 1 and CH 2 POSITION controls to midrange. (5) CH 1 and CH 2 VOLTS/DIV switches to 10 mV. (6) CH 1 and CH 2 AC-GND-DC switches to DC. (7) CH 1 and CH 2 VOLTS/DIV VARIABLE (CAL IN) pressed to in position. 8. Vertical Gain a. Performance Check (1) Connect oscilloscope calibrator CHAN 1 to TI CH 1 and connect oscilloscope calibrator CHAN 2 to TI CH2. (2) Set oscilloscope calibrator VOLTAGE output for 50 mV at 1 kHz amplitude. (3) Adjust TI time base controls as necessary for a stable display. (4) Adjust TI CH 1 GAIN control (front panel) for 5 divisions of display. (5) Set oscilloscope calibrator VOLTAGE output to settings as listed in 1st row of table 3. Oscilloscope calibrator frequency will remain at 1 kHz for all settings in table 3. (6) Set CH 1 VOLTS/DIV switch to VOLTS/DIV settings in 1st row of table 3 and rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain oscilloscope display divisions as listed in 1st row of table 3. Oscilloscope calibrator err display will indicate within limits specified in table 3; if not, perform b below. (7) Repeat technique of (3) through (6) above for remaining rows listed in table 3. Oscilloscope calibrator err display indications will be within limits specified in table 3.
Table 3. Ch 1 Vertical Gain Test instrument VOLTS/DIV switch settings 5 20 50 .1 .2 .5 1 2 5 mV mV mV V V V V V V 1 2 5 10 20 Oscilloscope calibrator voltage output 20 .1 .2 .5 mV V V V V V V V V Oscilloscope calibrator Err display limits (+%) 2 2 2 2 2 2 2 2 2

Test instrument display divisions 4 5 4 5 5 4 5 5 4

(8) Set DISPLAY MODE switch to CH 2.

5

TB 9-6625-2099-35 (9) Press oscilloscope calibrator CHANNEL pushbutton and press blue soft pushbutton located below CHAN 2. (10) Set oscilloscope calibrator VOLTAGE output for 50 mV at 1 kHz amplitude. (11) Adjust TI time base controls as necessary for a stable display. (12) Adjust TI CH 2 GAIN control (front panel) for 5 divisions of display. (13) Set oscilloscope calibrator VOLTAGE output to settings as listed in 1st row in table 4. Oscilloscope calibrator frequency will remain at 1 kHz for all settings in table 4. (14) Set CH 2 VOLTS/DIV switch to VOLTS/DIV settings in 1st row of table 4 and rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain oscilloscope display divisions as listed in 1st row of table 4. Oscilloscope calibrator err display will indicate within limits specified in table 4; if not, perform b below. (15) Repeat technique of (11) through (14) above for remaining rows listed in table 4. Oscilloscope calibrator err display indications will be within limits specified in table 4.
Table 4. Ch 2 Vertical Gain Test instrument VOLTS/DIV switch settings 5 20 50 .1 .2 .5 1 2 5 mV mV mV V V V V V V 1 2 5 10 20 Oscilloscope calibrator Voltage output 20 .1 .2 .5 mV V V V V V V V V Test instrument display divisions 4 5 4 5 5 4 5 5 4 Oscilloscope calibrator Err display limits (+%) 2 2 2 2 2 2 2 2 2

(16) Deenergize oscilloscope and remove TI from left vertical compartment and reinstall, using extender. (17) Energize oscilloscope. (18) Set CH 1 VOLTS/DIV switch to 5 mV and DISPLAY MODE switch to CH 1. (19) Ensure oscilloscope calibrator CHAN 1 is connected to CH 1 using a 5-80 pF standardizer. Press oscilloscope calibrator CHANNEL pushbutton and press blue soft pushbutton located below CHAN 1. (20) Set oscilloscope calibrator EDGE output frequency to 1 kHz. (21) Adjust oscilloscope calibrator output for 6 divisions of display. 6

TB 9-6625-2099-35 (22) Adjust standardizer for optimum square wave. If optimum square wave cannot be obtained, adjust CHANNEL 1 C100 (CH 2 adjust C100 CHANNEL 2) (fig. 1 or 2) to midrange and readjust standardizer for optimum square wave.

Figure 1. AM688/U (Tektronix, Type 7A18) - left side view.

Figure 2. Tektronix, Type 7A18A and 7A18A w/option 06 - left side view.

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TB 9-6625-2099-35 NOTE Use figure 1 for AM-6880/U (Tektronix, Type 7A18), and figure 2 for Tektronix, Type 7A18A and 7A18A w/option 06. (23) Set CH I VOLTS/DIV switch to 10 mV and adjust calibration generator output controls for a 6 division display. (24) Using corresponding adjustments listed in table 5, adjust for optimum square wave on display.
Table 5. Attenuator Compensation Test instrument CH 1 and CH 2 adjustments VOLTS/DIV (fig. 1 or 2)1 switch settings Square corners Flat top 10 mV C106 C107 20 mV C110 C111 50 mV C114 C115 .5 V C118 C119
1Adjustments

are numbered the same for CH1 and CH2.

(25) Repeat technique of (23) and (24) above for the remaining VOLTS/DIV switch settings listed in table 5. (26) Repeat technique of (18) through (25) above for CH 2. (27) Deenergize oscilloscope and remove TI and extender from left vertical compartment and reinstall TI into left vertical compartment. (28) Energize oscilloscope. b. Adjustments. No further adjustments can be made. 9. Risetime a. Performance Check (1) Set DISPLAY MODE switch to CH 1. (2) Set CH 1 VOLTS/DIV switch as listed in row of table 6. (3) Connect oscilloscope calibrator CHAN 1 to TI CH 1 and connect oscilloscope calibrator CHAN 2 to TI CH 2 using a 50 feedthrough termination. (4) Set oscilloscope calibrator EDGE output frequency as list in row of table 6. (5) Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain oscilloscope display divisions as listed in table 6. Measure risetime using standard risetime techniques. Risetime will be within limits as specified in table 6; if not, perform b below.

8

TB 9-6625-2099-35
Test instrument VOLTS/DIV switch settings (V) .2 .2 .2 .2 .2 .2 Table 6. Ch 1 Risetime Oscilloscope calibrator EDGE output Oscilloscope series 7900 7800 7700 7600 7500 7400 Frequency (kHz) 100 100 100 100 100 100 Test instrument display divisions 5 5 5 5 5 5 Test instrument risetime limits (nS) 4.7 4.7 4.7 5.0 5.8 7.0

Volts 1 1 1 1 1 1

(6) Repeat technique of steps (2) through (5) above for appropriate series oscilloscope. (7) Set DISPLAY MODE switch to CH 2. (8) Set CH 2 VOLTS/DIV switch as listed in 1st row of table 7. (9) Ensure oscilloscope calibrator CHAN 2 is connected to TI CH 2 using a 50 feedthrough termination. Press oscilloscope calibrator CHANNEL pushbutton then press blue soft pushbutton located below CHAN 2 on oscilloscope calibrator display. 1st (10) Ensure oscilloscope calibrator EDGE output and frequency are set as listed in row of table 7.

(11) Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain oscilloscope display divisions as listed in table 7. Measure risetime using standard risetime techniques. Risetime will be within limits as specified in table 7; if not, perform b below.
Test instrument VOLTS/DIV switch settings (V) .2 .2 .2 .2 .2 .2 Table 7. Channel 2 Risetime Oscilloscope calibrator EDGE output Oscilloscope series 7900 7800 7700 7600 7500 7400 Frequency (kHz) 100 100 100 100 100 100 Test instrument display divisions 5 5 5 5 5 5 Test instrument risetime limits (nS) 4.7 4.7 4.7 5.0 5.8 7.0

Volts 1 1 1 1 1 1

used.

(12) Repeat technique of steps (8) through (11) above for series oscilloscope being

b. Adjustments (1) Remove connections and 50 feedthrough termination from oscilloscope calibrator and TI.

9

TB 9-6625-2099-35 (2) Connect oscilloscope calibrator CHAN 1 to TI CH 1 using a 50 feedthrough termination. Set oscilloscope output to CHAN 1 using technique in (11) above. mV. (3) Set DISPLAY MODE switch to CH 1 and CH 1 VOLTS/DIV switch to 10 (4) Set oscilloscope calibrator to EDGE, and output to 60 mV at 1 kHz. (5) Adjust CH 1 POSITION, oscilloscope, and time base controls as necessary to view waveform. (6) Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain 6 divisions on oscilloscope display. If aberrations are not less than 0.24 divisions peak-to-peak, adjust R245, C245, and C275 (CH 2 adjust R445, C445, and C375) (fig. 1 or 2) for optimum square wave with aberrations of less than 0.24 divisions peak-to-peak (R). (7) Repeat technique of (2) through (6) above for CH 2. 10. Final Procedure a. Deenergize and disconnect all equipment. b. Annotate and affix DA Label/Form in accordance with TB 750-25. SECTION IV CALIBRATION PROCESS FOR AM1-6785/U (TEKTRONIX, TYPE 7A26) 11. Preliminary Instructions a. The instructions outlined in paragraphs 13 and 14 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 results 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. Addition maintenance information is contained in the manufacturers manuals for this TI. d. Unless otherwise specified, all controls and control settings refer to the TI. 12. Equipment Setup WARNING HIGH VOLTAGE is used or exposed during the performance of this calibration. DEATH ON CONTACT may result if personnel fail to observe safety precautions. REDUCE OUTPUT(S) to minimum after each set within the performance check when applicable. 10

TB 9-6625-2099-35 a. Remove protective cover from TI only when necessary to make adjustments. Replace cover after completing adjustments. b. Remove the left side panel from oscilloscope and install TI into oscilloscope left vertical compartment and time base into right horizontal compartment. c. Connect oscilloscope to a 115 V ac power source. Energize oscilloscope and allow at least 20 minutes for warmup. d. Position oscilloscope controls as listed in (1) through (3) below: (1) Press VERT MODE/LEFT pushbutton. (2) Press TRIG SOURCE/VERT MODE pushbutton. (3) Adjust INTENSITY, FOCUS, READOUT, and GRAT ILLUM controls as desired. e. Position TI controls as listed in (1) through (7) below: (1) DISPLAY MODE switch to CH 1. (2) TRIGGER SOURCE switch to MODE. (3) CH 2 POLARITY switch to +UP. (4) CH 1 and CH 2 POSITION controls to midrange. (5) CH 1 and CH 2 VOLTS/DIV switches to 10 mV. (6) CH 1 and CH 2 AC-GND-DC switches to DC. (7) BW switch to FULL. 13. Vertical Gain a. Performance Check (1) Connect oscilloscope calibrator CHAN 1 to TI CH 1 and connect oscilloscope calibrator CHAN 2 to TI CH 2. Ensure oscilloscope calibrator CHAN 1 output is presently selected by pressing oscilloscope calibrator CHANNEL pushbutton and then pressing blue soft pushbutton located below CHAN 1 on oscilloscope calibrator display. kHz. (2) Set oscilloscope calibrator VOLTAGE output to 50 mV and frequency to 1

(3) Adjust CH 1 POSITION, oscilloscope, and time base controls as necessary to view waveform. (4) Adjust CH 1 (front panel) GAIN control for 5 divisions of display. (5) Set oscilloscope calibrator VOLTAGE output as listed in 1st row of table 8.
st (6) Set CH 1 VOLTS/DIV switch as listed in 1 row of table 8 and rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain oscilloscope display divisions as listed in 1st row of table 8. Oscilloscope calibrator err display will indicate within limits as specified in table 8; if not, perform b(1) through (4) below.

11

TB 9-6625-2099-35 (7) Repeat technique of steps (4) through (6) above for remaining rows listed in table 8. Oscilloscope calibrator err display indications will be within limits specified in table 8.
Table 8. Ch 1 Vertical Gain Test instrument VOLTS/DIV switch settings 5 20 50 .1 .2 .5 1 2 5 mV mV mV V V V V V V 1 2 5 10 20 Oscilloscope calibrator Err display limits (+%) 2 2 2 2 2 2 2 2 2

Oscilloscope calibrator VOLTAGE output 20 .1 .2 .5 mV V V V V V V V V

Test instrument display divisions 4 5 4 5 5 4 5 5 4

(8) Set DISPLAY MODE switch to CH 2. (9) Set oscilloscope calibrator output to CHAN 2 using technique in step 1 above. (10) Set oscilloscope calibrator VOLTAGE output to 50 mV at 1 kHz. (11) Adjust CH 2 POSITION, oscilloscope, and time base controls as necessary to view waveform. (12) Adjust CH 2 (front panel) GAIN control for 5 divisions of display. (13) Set oscilloscope calibrator VOLTAGE output as listed in first row of table 9 . (14) Set CH 2 VOLTS/DIV switch as listed in first row of table 9 and rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain oscilloscope display divisions as listed in first row of table 9. Oscilloscope calibrator err display will indicate within limits as specified in table 9; if not, perform b(5) through (12) below. (15) Repeat technique of steps (12) through (14) above for remaining rows listed in table 8. Oscilloscope calibrator err display indications will be within limits specified in table 9.
Table 9. Ch 2 Vertical Gain Test instrument VOLTS/DIV switch settings 5 20 mV mV Oscilloscope calibrator VOLTAGE output 20 mV .1 V Oscilloscope calibrator Err display limits (+%) 2 2

Test instrument display divisions 4 5

12

TB 9-6625-2099-35
Table 9. Ch 2 Vertical Gain - Continued Test instrument VOLTS/DIV switch settings 50 mV .1 V .2 V .5 V 1 2 5 V V V 1 2 5 10 20 Oscilloscope calibrator VOLTAGE output .2 .5 V V V V V V V Oscilloscope calibrator Test instrument display divisions 4 5 5 4 5 5 4 Err display limits (+%) 2 2 2 2 2 2 2

(16) Connect oscilloscope calibrator CHAN 1 to TI CH 1 using a 50 feedthrough termination. Ensure oscilloscope calibrator CHAN 1 output is selected by using technique in step (1) above. mV. (17) Set DISPLAY MODE switch to CH 1 and CH 1 VOLTS/DIV switch to 10 (18) Set oscilloscope calibrator to EDGE, and output a 60 mV, 1 kHz output. (19) Adjust CH 1 POSITION and time base controls as necessary to view display. (20) Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain 6 divisions on oscilloscope display. If displayed waveform does not have flat tops, perform b(13) below (CH 2, b(14) below). (21) Remove 50 feedthrough termination from oscilloscope calibrator CHAN 1 and TI CH 1. Reconnect oscilloscope calibrator CHAN 1 to TI CH 1 using a 5-80 pF standardizer. Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain 6 divisions 6 divisions of vertical display. (22) Adjust standardizer for optimum square corner and flat top. If standardizer cannot be adjusted for optimum square wave, adjust CH 1 C134 (fig. 3) (CH 1 C130 (fig. 3) for SN B160000 and above) to midrange and readjust standardizer for optimum square wave.

13

TB 9-6625-2099-35

Figure 3. AM-6785/U and Tektronix, Type 7A26 - left side view.

(23) Adjust oscilloscope calibrator output for 6 divisions of display at each VOLTS/DIV switch setting listed in table 10. If oscilloscope does not display square corners and flat tops, perform appropriate adjustments listed in table 10. (24) Remove 5-80 pF standardizer from oscilloscope calibrator CHAN 1 and TI CH 1. (25) Set DISPLAY MODE switch to CH 2, and repeat technique of (16) through (23) above for CH 2. (26) Ensure oscilloscope calibrator CHAN 2 is connected to TI CH 2 using a 50 feedthrough termination. Ensure oscilloscope calibrator CHAN 2 output is selected by using technique in step (1) above. mV. (27) Set DISPLAY MODE switch to CH 2 and CH 2 VOLTS/DIV switch to 10 (28) Set oscilloscope calibrator to EDGE, and output a 60 mV, 1 kHz output. (29) Adjust CH 2 POSITION and time base controls as necessary to view display. (30) Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain 6 divisions on oscilloscope display. If displayed waveform does not have flat tops, perform b(14) below.

14

TB 9-6625-2099-35 (31) Remove 50 feedthrough termination from oscilloscope calibrator CHAN 2 and TI CH 2. Reconnect oscilloscope calibrator CHAN 2 to TI CH 2 using a 5-80 pF standardizer. Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain 6 divisions 6 divisions of vertical display. (32) Adjust oscilloscope calibrator output for 6 divisions of display at each VOLTS/DIV switch setting listed in table 10. If oscilloscope does not display square corners and flat tops, perform appropriate adjustments listed in table 10. 2. (33) Remove 5-80 pF standardizer from oscilloscope calibrator CHAN 2 and TI CH
Table 10. Attenuator Compensation Test instrument CH 1 and CH 2 adjustments VOLTS/DIV (fig. 3)1 switch settings Square corners Flat top 20 mV C106 C107 50 mV C110 C111 .1 mV C114 C115 1 V C118 C119
1Adjustments

for CH 1 and CH 2 are numbered the same.

b. Adjustments (1) Ensure oscilloscope calibrator output and TI VOLTS/DIV switch setting is set as indicated in first row of table 8. (2) Adjust CH 1 GAIN (front panel) for 4 divisions of amplitude. (3) Set CH 1 VOLTS/DIV switch to 10 mV and oscilloscope calibrator output for 50 mV. (4) Adjust R1317 CH 1 2X GAIN (fig. 3) for 5 divisions of amplitude (R). (5) Ensure oscilloscope calibrator output and TI VOLTS/DIV switch setting is set as indicated in first row of table 9. (6) Adjust CH 2 GAIN control (front panel) for 4 divisions of amplitude. (7) Set CH 2 AC-GND-DC switch to AC. (8) Adjust R2411 (fig. 3) polarity gain for minimum gain change while switching CH 2 POLARITY switch between +UP and INVERT. (9) Set CH 2 AC-GND-DC switch to DC and repeat (6) through (8) above until no further adjustments are needed. (10) Set CH 2 AC-GND-DC switch DC and VOLTS/DIV switch to 10 mV. (11) Set oscilloscope calibrator output controls for 50 mV at 1 kHz. (12) Adjust R2317 CH 2 2X GAIN (fig. 3) for 5 divisions of amplitude (R).

15

TB 9-6625-2099-35 (13) Adjust LF R1436 and R1431 (LF R1436 for SN 159999 and below) (fig. 3) for best flat top (minimum tilt) (R). (14) Adjust LF R2436 and HF R2431 (LF R2436 for SN 159999 and below) (fig. 3) for best flat top (minimum tilt) (R). 14. Risetime a. Performance Check (1) Set DISPLAY MODE switch to CH 1. (2) Set CH 1 VOLTS/DIV switch as listed in first row of table 11. (3) Connect oscilloscope calibrator CHAN 1 to TI CH 1 using a 50 feedthrough termination and connect oscilloscope calibrator CHAN 2 to TI CH 2 using a 50 feedthrough termination. (4) Set oscilloscope calibrator EDGE output frequency as listed in first row of table 11. (5) Adjust oscilloscope calibrator output controls for divisions as listed in table 11 for oscilloscope display divisions. (6) Adjust TI CH 1 POSITION, and TI time base controls to view waveform. If aberrations exceed limits listed in table 11 perform adjustments as indicated in table 11.
Test instrument VOLTS/DIV switch settings (mV) 10 Table 11. Ch 1 Aberrations Test instrument aberrations Oscilloscope calibrator limits EDGE Test (� 4 % and 6% pk-pk) of output instrument pulse amplitude display (mV) (MHz) divisions Pass Fail 50 1 5

Test instrument aberration adjustments b(l)

(7) Set DISPLAY MODE switch to CH 2. (8) Set CH 2 VOLTS/DIV switch as listed in table 12. (9) Press oscilloscope calibrator CHANNEL pushbutton. Next press blue soft pushbutton located below CHAN2 on oscilloscope calibrator when SELECT CHANNEL is displayed. (10) Ensure oscilloscope calibrator CHAN 2 is connected to TI CH 2 using a 50 feedthrough termination. (11) Set oscilloscope calibrator EDGE output frequency to listed in table 12. (12) Adjust oscilloscope calibrator output controls for divisions as listed in table 12 for oscilloscope display divisions. (13) Adjust TI CH 2 POSITION, and TI time base controls to view waveform. If aberrations exceed limits listed in table 12 perform adjustments as indicated in table 12.

16

TB 9-6625-2099-35
Test instrument VOLTS/DIV switch settings (V) .2 Table 12. Ch 2 Aberrations Test instrument aberrations Oscilloscope calibrator limits EDGE Test (� 4 % and 6% pk-pk) of output instrument pulse amplitude display Frequency Yes No divisions (mV) (MHz) 50 1 5

Test instrument aberration adjustment s b(2)

(14) Set oscilloscope calibrator output and frequency as listed in table 13. (15) Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain TI display divisions listed in table 13. Measure risetime using standard risetime techniques. Risetime will be within limits as specified in table 13 for oscilloscope series being used.
Test instrument VOLTS/DIV switch settings (V) .2 .2 .2 .2 .2 .2 Table 13. Ch 2 Risetime Oscilloscope calibrator EDGE output Oscilloscope series 7900 7800 7700 7600 7500 7400 Frequency (kHz) 100 100 100 100 100 100 Test instrument risetime limits (nS) 4.7 4.7 4.7 5.0 5.8 7.0

Volts 1 1 1 1 1 1

Test instrument display divisions 5 5 5 5 5 5

(16) Set DISPLAY MODE switch to CH 1. (17) Set CH 1 VOLTS/DIV switch as listed in table 14. (18) Ensure oscilloscope calibrator CHAN 1 is connected to TI CH 1 using a 50 feedthrough termination. Press oscilloscope calibrator CHANNEL pushbutton then press blue soft pushbutton located below CHAN 1 on oscilloscope calibrator display. (19) Ensure oscilloscope calibrator EDGE output and frequency are set as listed in table 14. (20) Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain oscilloscope display divisions as listed in table 14 . Measure risetime using standard risetime techniques. Risetime will be within limits as specified in table 14 for oscilloscope series being used.

17

TB 9-6625-2099-35
Table 14. Channel 1 Risetime

Test instrument VOLTS/DIV switch settings (V) .2 .2 .2 .2 .2 .2

Oscilloscope series 7900 7800 7700 7600 7500 7400

Oscilloscope calibrator EDGE output Frequency Volts (kHz) 1 100 1 100 1 100 1 100 1 100 1 100

Test instrument display divisions 5 5 5 5 5 5

Test instrument risetime limits (nS) 4.7 4.7 4.7 5.0 5.8 7.0

b. Adjustments (1) Adjust HF C1336, HF R1336, HF C1432, HF C1435, HF R1435, HF C1531, HF R1531, HF C1345, and HF R1345 (fig. 3) for optimum front corner and flat top (R). (2) Adjust HF C2336, HF R2336, HF C2432, HF C2435, HF R2435, HF C2531, HF R2531, HF C2345, and HF R2345 (fig. 3) for optimum front corner and flat top (R). 15. Final Procedure a. Deenergize and disconnect all equipment. b. Annotate and affix DA label/form in accordance with TB 750-25.

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TB 9-6625-2099-35
By Order of the Secretary of the Army:

0215706

Distribution: To be distributed in accordance with IDN 342232, requirements for calibration procedure TB-9-66252099-35.

TB 9-6625-2282-35
THESE ARE THE INSTRUCTIONS FOR SENDING AN ELECTRONIC 2028

The following format must be used if submitting an electronic 2028. The subject line must be exactly the same and all fields must be included; however, only the following fields are mandatory: 1, 3, 4, 5, 6, 7, 8, 9, 10, 13, 15, 16, 17, and 27.
From: "Whomever" [email protected] To: [email protected] Subject: DA Form 2028 1. From: Joe Smith 2. Unit: Home 3. Address: 4300 Park 4. City: Hometown 5. St: MO 6. Zip: 77777 7. Date Sent: 19-Oct-93 8. Pub No: TB 9-6625-xxxx-35 9. Pub Title: Calibration Procedure for ... 10. Publication Date: 11. Change Number: 12. Submitted Rank: MSG 13. Sumitter Fname: Joe 14. Submitter Mname: T 15. Submitter Lname: Smith 16. Submitter Phone: (123) 123-1234 17. Problem: 1 18. Page: 2 19. Paragraph: 3 20 Line: 4 21. NSN: 5 22. Reference: 6 23. Figure : 7 24. Table: 8 25. Item: 9 26. Total: 123 27: Text: This is the text for the problem below line 27.

PIN: 052624-000