Boonton-1120-cal-078339 电路图.pdf

_ *This bulletin supersedes TB 9-6625-2271-35, dated 5 March 1998. *TB 9-6625-2271-50 SUPERSEDED COPY DATED 5 MARCH 1998 DEPARTMENT OF THE ARMY TECHNICAL BULLETIN CALIBRATION PROCEDURE FOR AUDIO ANALYZER BOONTON, MODEL 1120-S/10 Headquarters, Department of the Army, Washington, DC 21 August 2000 Approved for public release; distribution is unlimited REPORTING OF ERRORS You can help improve this publication by calling attention to errors and by recommending improvements and stating your reasons for the recommendations. Your letter or DA Form 2028, Recommended Changes to Publications, should be mailed directly to Commander, U.S. Army Aviation and Missile Command, ATTN: AMSAM-TMD-LP, Redstone Arsenal, AL 35898-5000. You may also contact this office electronically. FAX to DSN 788-2313 (commercial 256-842-2313). A reply will be furnished directly to you. 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 4 Accessories required . 5 4 III. CALIBRATION PROCESS Preliminary instructions. 6 5 Equipment setup and internal calibration. 7 5 Dc measurement accuracy. 8 7 Ac measurement accuracy. 9 8 Frequency measurement . 10 11 Filters frequency accuracy. 11 12 Distortion measurement accuracy. 12 12 Output frequency accuracy. 13 15 Output level . 14 16 Output distortion. 15 19 SINAD measurement accuracy . 16 20 Final procedure. 17 22 RadioFans.CN 收音机爱 好者资料库 TB 9-6625-2271-50 2 SECTION I IDENTIFICATION AND DESCRIPTION 1. Test Instrument Identification. This bulletin provides instructions for the calibration of Audio Analyzer, Boonton, Model 1120-S/10. The manufacturers manual was used as the prime data source in compiling these instructions. The equipment being calibrated will be referred to as the TI (test instrument) throughout this bulletin. a. Model Variations. None. b. Time and Technique. The time required for this calibration is approximately 6 hours, 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 a sentence in which they appear. When adjustments are in tables, the (R) follows the designated adjustment. 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 Dc level measurement Range: 3, 30, 300 V FS Accuracy: +1% or 3 counts whichever is greater Ac level measurement Range: 3, 30, 300 mV and 3, 30, 300 V Range: 50 Hz to 50 kHz (1 mV to 300 V) Accuracy: +1% Range: 20 to 50 Hz and 50 to 100 kHz (1 mV to 300 V) Accuracy: +2% Range: 10 to 20 Hz1 (1 mV to 300 V) Accuracy: +3% Range: 10 Hz to 100 kHz1 (.3 mV to 300 V) Accuracy: +4 Flatness Range: 1 mV to 300V Range: 50 Hz to 50 kHz (1 mV to 300 V) Accuracy: +0.5% Range: 20 to 50 Hz and 50 kHz to 100 kHz (1 mV to 300 V) Accuracy: +1.0% Range: 10 to 20 Hz1 (1 mV to 300 V) Accuracy: +2.0% See footnotes at end of table. RadioFans.CN 收音机爱 好者资料库 TB 9-6625-2271-50 3 Table 1. Calibration Description - Continued Test instrument parameters Performance specifications Frequency counter Range: 20 Hz to 500 kHz Sensitivity: 3 mV Accuracy: +1 ppm/yr +1 count Audio filters Range: 30 kHz low-pass Accuracy: +2 kHz Range: 80 kHz low-pass Accuracy: +4 kHz Range: 220 kHz low-pass Accuracy: +20 kHz Range: 400 Hz high-pass Accuracy: +40 Hz Distortion measurement Range: 10 Hz to 20 kHz Accuracy: +1 dB Range: 20 to 100 kHz Accuracy: +2 dB Input voltage range: 10 mV to 300 V SINAD measurement Frequency range: 10 Hz to 100 kHz Input voltage range: 10 mV to 300 V Display range: -120.00 to 0.00 dB2 Accuracy: +1 dB, 20 Hz to 20 kHz +2 dB, 10 Hz to 100 kHz Output frequency Range: 20 Hz to 140 kHz Accuracy: +10 ppm +1 count Output level Range: 10 Hz to 50 kHz, 0.6 mV to 16 V Accuracy: +0.5% of setting +0.05% of range Range: 50 to 100 kHz, 0.6 mV to 16 V Accuracy: +1.0% of setting +0.05% of range Range: 100 to 140 kHz, 0.6 mV to 16 V Accuracy: +1.5% of setting +0.1% of range Flatness Ref 1 kHz (.30 mV to 8 V into 50) Accuracy: +0.5%; 10 Hz1 to 50 kHz Output distortion Range: 10 Hz to 20 kHz, 80 kHz bandwidth Accuracy: 0.01% (<-80 dB) Range: 20 to 50 kHz, 220 kHz bandwidth Accuracy: 0.02% (<-74 dB) Range: 50 to 100 kHz, 500 kHz bandwidth Accuracy: 0.056% (<-65 dB) Range: 100 to 140 kHz, 500 kHz bandwidth Accuracy: 0.1% (<-60 dB) 1Not checked below 20 Hz. 2Not verified below -30 dB. RadioFans.CN 收音机爱 好者资料库 TB 9-6625-2271-50 4 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 Calibration Standards Set NSN 4931-00-621-7878. 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. 5. Accessories Required. The accessories required for the calibration are common usage accessories, issued as indicated in paragraph 4 above and are not listed in this calibration procedure. Table 2. Minimum Specifications of Equipment Required Common name Minimum use specifications Manufacturer and model (part number) AC MEASUREMENT STANDARD Range: 20 Hz to 120 kHz 2.97 mV to 16.256 V Accuracy: .125% John Fluke, Model 5790A (5790A) CALIBRATOR Range: 3 to 300 V dc Accuracy: 0.2755% Range: 20 Hz to 100 kHz, 3 mV to 300 V Accuracy: .25% John Fluke, Model 5700A/CT (p/o MIS-35947); w/power amplifier, John Fluke, Model 5725A (5725A); w/ac divider, John Fluke, Model 7405A-4207 (7405A-4207) MULTIMETER ACV range: 20 Hz to 100 kHz, 1 mV to 3 V rms Accuracy: 0.175% Hewlett-Packard, Model 3458A/E02 (3458A/E02) FREQUENCY COUNTER Range: 20 Hz to 140 kHz Accuracy: 2.5 ppm Hewlett-Packard, Model 5345A (MIS-28754/1 Type 1) SPECTRUM ANALYZER1 Range: 1 kHz <-75 dBm Hewlett-Packard, Model 3585A (MIS-35951) SYNTHESIZER/FUNCTION GENERATOR Frequency range: 1200 Hz to 80 kHz Attenuator Accuracy: 0.25 dB 1200 Hz 0.5 dB 80 kHz Hewlett-Packard, Model 3325A (MIS-35932) TIME/FREQUENCY WORKSTATION Range: 10 MHz Accuracy: 0.25 ppm AUTEK Systems Corp., Model 620 (MIS-38946) 1Used only for adjustments. TB 9-6625-2271-50 5 SECTION III CALIBRATION PROCESS 6. Preliminary Instructions a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration process. Personnel should become familiar with the applicable sections 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 result 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 manufacturers manual for this TI. d. Unless otherwise specified, all controls and control settings refer to the TI. 7. Equipment Setup and Internal Calibration. 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 where applicable. a. Remove TI top cover and assure A4S1 switch segments are all in the up position as shown in figure 1. Note initial settings (if not up) for return after completion of procedure. Figure 1. A4S1 - switch location. b. Replace top cover and connect TI to a 115 V ac source. TB 9-6625-2271-50 6 c. Set LINE switch to ON and allow 1 hour for warmup. d. Connect calibrator OUTPUT HI and LO to TI INPUT HIGH and LOW using balanced cable supplied with TI. NOTE If balanced cable is not available then connect as shown in figure 2 for this and all future reference to balanced cable. Figure 2. Input connection. e. Set calibrator for a 3 V, 1 kHz output. f. Press LCL INIT key. Press INPUT FLOAT key and verify INPUT FLOAT indicator is illuminated. g. Press SPCL key and enter 20 ENTER using DATA ENTRY keys. Allow sufficient time for ac self-calibration to complete before continuing. NOTE Ac self-calibration is being performed. Verify no error codes are displayed on TI. h. Disconnect calibrator from TI. i. Connect TI INPUT LOW to INPUT HIGH using a short cable. j. Press SPCL key and enter 23 ENTER using DATA ENTRY keys. Allow sufficient time for dc zero calibration to complete before continuing. TB 9-6625-2271-50 7 NOTE Dc offset self-calibration is being performed. Verify no error codes are displayed on TI. k. Connect calibrator OUTPUT HI and LO to TI INPUT HIGH and LOW using balanced cable. l. Set calibrator for a 3 V dc output. m. Press SPCL key and enter 24 ENTER using DATA ENTRY keys. Allow sufficient time for dc calibration to complete before continuing. NOTE Dc self-calibration is being performed. Verify no error codes are displayed on TI. n. Set calibrator output to standby. 8. Dc Measurement Accuracy a. Performance Check (1) Connect calibrator OUTPUT HI and LO to TI INPUT HIGH and LOW using balanced cable. (2) Press keys as listed in (a) through (c) below: (a) LCL INIT (b) INPUT FLOAT (assure illumination) (c) FILTERS DC (3) If TI does not indicate between -0.003 and 0.003 V perform b below. (4) Set calibrator for a 3 V dc output. TI will indicate between 2.97 and 3.03 V. (5) Repeat technique of (4) above using calibrator output settings and TI indications listed in table 3 below. Table 3. Dc Measurement Calibrator output settings Test instrument indications (V) (V dc) Min Max 30 29.7 30.3 300 297 303 -300 -303 -297 -30 -30.3 -29.7 -3 -3.03 -2.97 b. Adjustments. No specific dc input adjustments can be made; however, misalignment of balance adjustments located after ac measurement accuracy can adversely affect this parameter. TB 9-6625-2271-50 8 9. Ac Measurement Accuracy a. Performance Check (1) Connect calibrator OUTPUT HI and LO to TI INPUT HIGH and LOW using balanced cable. (2) Press LCL INIT key. Press INPUT FLOAT key and verify INPUT FLOAT indicator is illuminated. (3) Set calibrator for a 3 mV, 1 kHz output. If TI indication is not between 2.970 and 3.030 mV, perform b below. (4) Repeat technique of (3) above using calibrator output settings and TI indications listed in table 4. Table 4. Ac Measurement Accuracy Calibrator output settings Test instrument indications (V) Amplitude (V) Frequency Min Max .03 1 kHz 29.70 m 30.30 m .3 1 kHz 297.0 m 303.0 m 3 1 kHz 2.970 3.030 30 1 kHz 29.70 30.30 300 1 kHz 297.0 303.0 .003 50 Hz 2.970 m 3.030 m .03 50 Hz 29.70 m 30.30 m .3 50 Hz 297.0 m 303.0 m 3 50 Hz 2.970 3.030 30 50 Hz 29.70 30.30 300 50 Hz 297.0 303.0 .003 49 Hz 2.940 m 3.060 m .03 49 Hz 29.40 m 30.60 m .3 49 Hz 294.0 m 306.0 m 3 49 Hz 2.940 3.060 30 49 Hz 29.40 30.60 200 49 Hz 196.0 204.0 .003 20 Hz 2.940 m 3.060 m .03 20 Hz 29.40 m 30.60 m .3 20 Hz 294.0 m 306.0 m 3 20 Hz 2.940 3.060 30 20 Hz 29.40 30.60 200 20 Hz 196.0 204.0 TB 9-6625-2271-50 9 Table 4. Ac Measurement Accuracy - Continued Calibrator output settings Test instrument indications (V) Amplitude (V) Frequency Min Max 3 100 kHz 2.940 3.060 30 100 kHz 29.40 30.60 200 100 kHz 196.0 204.0 .003 51 kHz 2.940 m 3.060 m .03 51 kHz 29.40 m 30.60 m .3 51 kHz 294.0 m 306.0 m b. Adjustments NOTE All adjustments interact and must be performed in their entirety. After making adjustments in this section, it is necessary to return to beginning of procedure. (1) Connect spectrum analyzer input to TI MONITOR (rear panel). (2) Connect TI OUTPUT HIGH to INPUT HIGH and LOW using tee connector and two cables. (3) Press keys and enter values using DATA ENTRY keys as listed in (a) through (g) below: (a) LCL INIT. (b) INPUT FLOAT (assure illumination). (c) SPCL. (d) 28 ENTER. (e) SOURCE LEVEL. (f) 3 V. (g) ANALYZER LEVEL. (4) Adjust spectrum analyzer controls to observe a 1 kHz signal. (5) Alternately adjust A0R29 and A0C35 (fig. 3) for minimum indication on spectrum analyzer (R). (6) Press SPCL key and enter 27 ENTER using DATA ENTRY keys. Adjust A0R12 (fig. 3) for minimum indication on spectrum analyzer. (7) If <-75 dB was not achieved in (5) or (6) above, then alternately adjust A0C5, A0C10, and A0R12 (fig. 3) for minimum indication on spectrum analyzer (R). TB 9-6625-2271-50 10 Figure 3. Input board - adjustment locations. (8) Press SPCL key and enter 26 ENTER using DATA ENTRY keys. (9) Adjust A0R7 (fig. 3) for minimum indication on spectrum analyzer (R). (10) If 70.7 percent. (6) Set calibrator frequency to 32.01 kHz. TI will indicate 70.7 percent. (11) Set calibrator frequency to 84.01 kHz. TI will indicate 70.7 percent. (16) Set calibrator frequency to 240.1 kHz. TI will indicate <70.7 percent. b. Adjustments. No adjustments can be made. 12. Distortion Measurement Accuracy a. Performance Check (1) Connect TI OUTPUT HIGH to INPUT HIGH using short shielded cable. (2) Connect calibrator OUTPUT HI and LO to TI INPUT LOW using calibrator ac divider (1000:1). (3) Press keys and enter values using DATA ENTRY keys as listed in (a) through (h) below: TB 9-6625-2271-50 13 (a) LCL INIT. (b) INPUT FLOAT (assure illumination). (c) SOURCE FREQ. (d) 21 Hz. (e) SOURCE LEVEL. (f) 1 V. (g) ANALYZER DIST. (h) dB. (4) Set calibrator for a 1 V, 222 Hz output. If TI indication is not between -59 and - 61 dB, perform b below. (5) Press TI SOURCE FREQ key and enter 1 kHz using DATA ENTRY keys. If TI indication is not between -59 and -61 dB, perform b below. (6) Repeat technique of (5) using TI SOURCE FREQ settings and indications listed in table 6. Table 6. Distortion Measurement Accuracy at -60 dB Test instrument SOURCE FREQ settings