Tektronix 7L5 Calibration Procedure
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Tektronix 7L5 Calibration Procedure

Tektronix 7L5 Calibration Procedure

Spectrum analyzer w/plug-in l1 and l3
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Changes to Publications, should be mailed directly to Commander, U.S. Army TMDE Support Group,
ATTN: AMXTM-LPP, Redstone Arsenal, AL 35898-5400. A reply will be furnished directly to you.
I.
Test instrument identification ...........................................................
Forms, records, and reports.............................................................
Calibration description.....................................................................
II.
Equipment required.........................................................................
Accessories required.......................................................................
III.
Preliminary instructions ...................................................................
Equipment setup.............................................................................
Readout verification (L3 plug-in only)................................................
Calibrator frequency and amplitude..................................................
Sweep triggering.............................................................................
Dot frequency range and accuracy...................................................
Display dynamic range ....................................................................
Display flatness ..............................................................................
Frequency span accuracy and linearity.............................................
Reference level accuracy (for L3 plug-in only)...................................
Sweep rate accuracy.......................................................................
Displayed frequency stability ...........................................................
Final procedure...............................................................................
*This bulletin supersedes TB 9-6625-2005-35, 24 April 1981, including all changes.
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
SPECTRUM ANALYZER
TEKTRONIX, TYPE 7L5 (PL-1391/U)
W/PLUG-IN L1 AND L3
Headquarters, Department of the Army, Washington, DC
16 June 1988
Approved for public release; distribution is unlimited.
REPORTING OF ERRORS
SUPERSEDED COPY DATED 24 APRIL 1981
Your letter or DA Form 2028, Recommended
*TB 9-6625-2005-35
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  • Page 1: Table Of Contents

    SUPERSEDED COPY DATED 24 APRIL 1981 DEPARTMENT OF THE ARMY TECHNICAL BULLETIN CALIBRATION PROCEDURE FOR SPECTRUM ANALYZER TEKTRONIX, TYPE 7L5 (PL-1391/U) W/PLUG-IN L1 AND L3 Headquarters, Department of the Army, Washington, DC 16 June 1988 Approved for public release; distribution is unlimited.

  • Page 2: Section I

    2. Forms, Records, and Reports provides instructions for the calibration of Spectrum Analyzer, Tektronix, Type 7L5 (PL-1391/U) w/Plug-in L1 a. Forms, records, and reports required for and L3. The manufacturer's manual was used as the calibration personnel at all levels are prescribed by TB prime data source in compiling these instructions.

  • Page 3: Equipment Requirements

    TB 9-6625-2005-35 Table 1. Calibration Description - Continued Test instrument Performance parameters specifications Frequency Range: 50Hz to 500 kHz/DIV span Linearity: within 5% Accuracy: ± 5% Sweep rate Range: 0.1 ms to 10 s Accuracy: within 5% of rate selected Sweep triggering Range: 30Hz to 500 kHz Level: -1.5 div...
  • Page 4 TEST OSCILLATOR Frequency: 10 Hz to 5 MHz Hewlett-Packard, Model 652A (MIS- Level accuracy: 1% 10224) VERTICAL Must be compatible with 7000 series Tektronix, Types 7A15, 7A16, 7A18, AMPLIFIER oscilloscope etc. VARIABLE Range: 0 to 69 dB Weinschel, Model AF117A-69-34...

  • Page 5: Calibration Process

    Tektronix, Model 067-0616-00 (067-0616-00) LEAD 32-in., single banana plug to test hook (red) (7915941-1) PROBE (TEST LEAD) 36-in., BNC plug to X10 probe, Tektronix, Type P6106 (11513202- TERMINATION 50-Ω feed-through; BNC plug to BNC jack (11048B or 11048C) (DUMMY LOAD)

  • Page 6: Equipment Setup

    TB 9-6625-2005-35 7. Equipment Setup (11) DIGITAL STORAGE SAVE A pushbutton to off. WARNING (12) DIGITAL STORAGE HOLD pushbutton off. HIGH VOLTAGE is used or exposed (13) dBm/dBV switch to dBV (plugin module during performance this switch). calibration. DEATH ON CONTACT (14) INPUT TERMNZ switch to 50Q (L3 plug-in result personnel...

  • Page 7: Readout Verification (L3 Plug-In Only)

    TB 9-6625-2005-35 m. Position controls as listed in (1) through (10) NOTE below: (1) SWP CAL and HORIZ POSITION controls The INPUT connector is a three- adjusted until second and tenth vertical signals are conductor BNC connector with the alined with second and tenth vertical graticule lines outer ring used...
  • Page 8 TB 9-6625-2005-35 Figure 1. Calibrator accuracy - equipment setup. (7) Disconnect cable from ac voltmeter input (9) Adjust REFERENCE LEVEL control to and reconnect to TI input. display signal at center of crt and note signal position (8) Position controls as listed in ( a ) through (reference).
  • Page 9 TB 9-6625-2005-35 (13) Adjust test oscillator controls for an output frequency of 500 kHz and 10 mV indication on ac voltmeter. (14) Disconnect termination from ac voltmeter and reconnect test oscillator output without termination to TI plug-in input. (15) Adjust REFERENCE LEVEL control to display signal at center of crt and note signal position (reference).

  • Page 10: Sweep Triggering

    TB 9-6625-2005-35 Figure 4. IF module swung down to expose internal locations. 10. Sweep Triggering (c) TRIGGERING SOURCE NORM pushbutton on. a. Performance Check (d) TRIGGERING FREE (1) Turn POWER switch of oscilloscope (A7) pushbutton on. to off and install vertical amplifier (A10) in the left (e) TIME/DIV control to 10 ms.

  • Page 11: Dot Frequency Range And Accuracy

    TB 9-6625-2005-35 (10) Press TRIGGERING MODE MNL SWP (d) RESOLUTION (Hz) control pushbutton on and adjust MNL SWP control to move COUPLED. trace over approximately the same range as the normal (e) FREQUENCY SPAN/DIV control for sweep. 50 (z). (f) TIME/DIV control to AUTO. b.
  • Page 12 TB 9-6625-2005-35 (2) Remove rf screen cover (on right side of (10) Adjust DOT FREQUENCY control for TI) over honeycomb assembly and turn power on. 00.00 kHz indication on the crt and connect digital (3) Position controls as listed in ( a ) through voltmeter positive lead to pin MH (fig.

  • Page 13: Display Dynamic Range

    TB 9-6625-2005-35 (25) Adjust HORIZ POSITION control to center 2500.00 kHz marker on center graticule line of crt. (26) Adjust SWP CAL (front panel) adjustment for optimum span accuracy from 2500.00 to 500.00 kHz. (27) Disconnect CALIBRATOR output from TI plug-in INPUT.
  • Page 14 TB 9-6625-2005-35 (6) Adjust both attenuator controls to 0 dB. (12) Increase attenuators ensuring displayed signal will decrease to 4 ±0.2 divisions. (7) Position controls as listed in ( a ) through (c) below: (13) Increase attenuators ensuring displayed signal will decrease to 2 ±0.1 divisions. (a) FREQUENCY SPAN/DIV control for 50 Hz.
  • Page 15 TB 9-6625-2005-35 (b) LOG 2 dB/DIV pushbutton ON. (25) Adjust VERT POSITION control (c) REFERENCE LEVEL control for -29 necessary to establish a new reference point. Record dBm. reference. (d) RESOLUTION (Hz) control for 3 (26) Pull REFERENCE LEVEL 10 dB/STEP kHz.

  • Page 16: Display Flatness

    TB 9-6625-2005-35 Table 6. Linearity Accuracy Test instrument Attenuator Signal amplitude REFERENCE LEVEL settings in divisions switch settings (dB) ±5 percent 5 mV 2 mV 1 mV 0.5 mV 0.2 mV 0.1 mV 50 µV 20 µV 10 µV 5 µV 2 µV 1 µV 500 nV...
  • Page 17 TB 9-6625-2005-35 (5) Repeat technique of (3) and (4) above (b) LOG 2 dB/DIV pushbutton on. with DOT FREQUENCY control set to 150.000 kHz, (c) DIGITAL STORAGE pushbuttons 2500.00 kHz, 3500.00 kHz, and 4500.00 kHz. OFF. (d) FREQUENCY SPAN/DIV control for b.

  • Page 18: Frequency Span Accuracy And Linearity

    TB 9-6625-2005-35 14. Frequency Span Accuracy and Linearity (7) Repeat technique of (3) above and verify 8th marker coincident within +.4 division. a. Performance Check (8) Position FREQUENCY SPAN/DIV control (1) Disconnect test oscillator (A9) output from to 100 kHz and position oscilloscope calibrator controls input and connect CALIBRATOR output to INPUT using for an output of 10 ps.

  • Page 19: Reference Level Accuracy (For L3 Plug-In Only)

    TB 9-6625-2005-35 Table 7. Frequency Span Accuracy Test instrument Oscilloscope Tolerance within 4% FREQUENCY SPAN/DIV calibrator Displayed settings control markers/div on the crt settings 5 µs 200 kHz 1 div 10 µs 100 kHz 1 div 10 µs 50 kHz 2 div 50 µs 20 kHz...
  • Page 20 TB 9-6625-2005-35 (6) Adjust REFERENCE LEVEL control for - (4) Adjust C126 (fig. 9) for 7 divisions of 37 dBV and variable attenuator controls to 40 dB. amplitude on the crt. displayed signal amplitude is not 7 divisions ±0.1 minor (5) Adjust REFERENCE LEVEL control for -5 dBV and variable attenuator controls to 8 dB.

  • Page 21: Sweep Rate Accuracy

    TB 9-6625-2005-35 (16) Adjust test oscillator output controls for 7 (d) TRIGGERING SOURCE MODE divisions of amplitude on the crt. NORM pushbutton to on. (17) Adjust REFERENCE LEVEL controls for (2) Position oscilloscope calibrator (A8) +7 dBV and variable attenuator controls to 0 dB. controls for an output of .1 ms.

  • Page 22: Displayed Frequency Stability

    TB 9-6625-2005-35 (5) Disconnect equipment setup. (6) Adjust DOT MKR control to establish a center screen reference (trailing edge center on crt b. Adjustments. Perform adjustments vertical and horizontal) on the crt. paragraph 11b if not already performed, and repeat (7) Press DIGITAL STORAGE SAVE A and paragraph 11a.

  • Page 23: Final Procedure

    TB 9-6625-2005-35 18. Final Procedure a. Deenergize and disconnect all equipment. b. Annotate and affix DA Label/Form in accordance with TB 750-25. Figure 11. Frequency stability test waveform interpolation. By Order of the Secretary of the Army: CARL E. VUONO General, United States Army Chief of Staff Official:...
  • Page 24 TB 9-6625-2005-35 PIN NO: 048495-000...

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Pl-1391/u

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