*TB 9-6625-2049-35
SUPERSEDED COPY DATED 15 JANUARY 1996
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR SYNTHESIZER/FUNCTION GENERATOR HEWLETT-PACKARD
MODELS 3325A( ) AND 3325B( )
Headquarters, Department of the Army, Washington, DC
2 January 2001
Approved for public release; distribution is unlimited
REPORTING OF ERRORS AND RECOMMENDED IMPROVEMENTS
You can help improve this publication. If you find any mistakes or if you know of a way to improve the procedure, please let us know. Mail your letter or DA Form 2028 to: Commander, U. S. Army Aviation and Missile Command, ATTN: AMSAM-MMC-LS-LP, Redstone Arsenal, AL 35898-5230. A reply will be furnished to you. You may also send in your comments electronically to our e-mail address: ls-lp@redstone.army.mil or by FAX (256) 842-6546/DSN 788-6546
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Paragraph |
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SECTION |
I. |
IDENTIFICATION AND DESCRIPTION |
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Test instrument identification............................ |
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2 |
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Forms, records, and reports................................ |
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2 |
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Calibration description ....................................... |
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II. |
EQUIPMENT REQUIREMENTS |
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Equipment required............................................ |
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4 |
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Accessories required ........................................... |
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III |
CALIBRATION PROCESS |
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Preliminary instructions..................................... |
6 |
6 |
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Equipment setup................................................. |
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6 |
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Harmonic distortion............................................ |
8 |
7 |
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Amplitude modulation distortion........................ |
9 |
9 |
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Square wave characteristics ............................... |
10 |
9 |
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Ramp retrace....................................................... |
11 |
10 |
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Frequency accuracy ............................................ |
12 |
11 |
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Phase increment ................................................. |
13 |
13 |
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Sine wave amplitude and flatness ...................... |
14 |
14 |
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Square wave amplitude and flatness.................. |
15 |
16 |
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*This bulletin supersedes TB 9-6625-2049-35, 15 January 1996.
TB 9-6625-2049-35
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SECTION |
II CALIBRATION PROCESS - Continued |
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I. |
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Triangle and ramp amplitude ............................ |
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Dc offset............................................................... |
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18 |
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Dc offset with ac .................................................. |
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High voltage output option 002 only................... |
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20 |
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Power supply ....................................................... |
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21 |
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Final procedure ................................................... |
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SECTION I
IDENTIFICATION AND DESCRIPTION
1.Test Instrument Identification. This bulletin provides instructions for the calibration of Synthesizer/Function Generator, Hewlett-Packard, Models 3325A( ) and 3325B( ). The manufacturer's manuals and TM 11-6625-3065-14 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. Option 001: High Stability Frequency Reference; Option 002: High Voltage Output; Option E04: includes Options 001, 002, and instrument front handles and chassis slides; Option 907: Front Handle Assembly; Option 908: Rack Mount Flange Kit; Option 909: Rack Mount Flange Kit/Front Handle Assembly; Option 910: Additional Operating and Service Manual. Variations among models are described in text, tables, and figures.
b.Time and Technique. The time required for this calibration is approximately 4 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 the 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 in table 1.
2
TB 9-6625-2049-35
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Table 1. |
Calibration Description |
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Test instrument parameters |
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Performance specifications |
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Harmonic distortion1 |
Fundamental frequency: |
0.1 Hz To 50 kHz |
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(relative to fundamental at |
Accuracy: |
No harmonic greater than -65 dB |
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full output) |
Fundamental frequency: |
50 to 200 kHz |
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Accuracy: No harmonic greater than -60 dB |
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Fundamental frequency: 200 kHz to 2 MHz (200 kHz to 1 MHz |
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for option 002) |
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Accuracy: No harmonic greater than -40 dB |
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Fundamental frequency: 2 to 15 MHz |
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Accuracy: No harmonic greater than -30 dB |
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Fundamental frequency: 15 to 20 MHz |
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Accuracy: |
No harmonic greater than -25 dB |
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Amplitude modulation |
AM distortion: ≤-30 dB at 80% modulation, 10 kHz, and 0 V dc |
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offset |
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Square wave |
Rise time and fall time: ≤20 ns, (≤125 ns for option 002) at full |
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output |
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Symmetry: ≤.02% of period +3 ns |
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Overshoot: ≤5% of p-p amplitude at full output (<10% of peak |
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amplitude for option 002) |
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Ramp retrace |
≤3 μs retrace time, positive or negative ramps |
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Frequency |
Accuracy: 5 x 10-6 of selected value |
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Sine wave |
Range: |
1 μHz to 20 999 999.999 Hz |
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(option 002: .02 Hz to 25.6 kHz) |
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Square wave |
Range: |
1 μHz to 10 999 999.999 Hz |
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(option 002: .02 Hz to 25.6 kHz) |
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Triangle |
Range: |
1 μHz to 10 999 999.999 Hz |
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(option 002: .02 Hz to 10 kHz) |
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Positive slope ramp |
Range: |
1 μHz to 10 999 999.999 Hz |
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(option 002: .02 Hz to 10 kHz) |
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Negative slope ramp |
Range: |
1 μHz to 10 999 999.999 Hz |
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(option 002: .02 Hz to 10 kHz) |
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Phase offset |
Range: |
Variable |
±719.9° |
with |
respect to arbitrary starting |
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phase, |
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or assigned zero phase |
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Accuracy: |
±0.2° |
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Tolerance relative to |
Amplitude |
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programmed amplitude |
Amplitude accuracy with no |
Sine wave: .001 Hz to 100 kHz2 |
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±0.1 dB |
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attenuation (attenuator range 1) |
Square wave: .001 Hz to 100 kHz |
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±1.0% |
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into 50Ω load (no dc offset ) |
Triangle: .001 Hz to 2 kHz |
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±1.5% |
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2 kHz to 10 kHz |
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±5% |
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Ramps: .001 Hz to 500 Hz |
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±1.5% |
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500 Hz to 10 kHz |
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±10% |
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Flatness with no attenuation |
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Tolerance relative to |
(attenuator range1)intoa50Ωload |
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programmed amplitude at 1 kHz |
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Sine wave: |
100 |
kHz |
to |
20 |
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±0.3 dB |
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MHz |
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Square wave: 100 kHz to 10 MHz |
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±10% |
See footnotes at end of table.
3
TB 9-6625-2049-35
Table 1. Calibration Description - Continued
Test instrument parameters |
Performance specifications |
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Amplitude |
accuracy |
with dc |
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Tolerance relative to |
offset and |
no |
attenuation |
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programmed amplitude |
(range 1) |
into 50Ω load |
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Sine wave: .001 Hz to 100 kHz |
±0.3 dB |
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Square: .001 Hz to 100 kHz |
±3% |
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Triangle: .001 Hz to 2 kHz |
±4% |
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2 kHz to 10 kHz |
±6% |
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Ramps: .001 Hz to 500 Hz |
±4% |
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500 Hz to 10 kHz |
±11% |
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Tolerance relative to |
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Function and frequency range |
programmed amplitude |
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Attenuator accuracy (these |
.001 Hz to 100 kHz |
±0.1 dB |
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errors are additive with the |
Attenuator ranges 2 through 8 |
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amplitude accuracy errors) |
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100 kHz to 10 MHz |
±0.2 dB |
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Attenuator ranges 2 through 8 |
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10 MHz to 20 MHz |
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Attenuator ranges 2 through 4 |
0.2 dB |
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Attenuator ranges 5 through 8 |
±0.5 dB |
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Amplitude output |
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Range: 1.000 mV to 10.00 V p-p |
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Amplitude (option 002) |
Range: 4 mV to 40 V p-p (>500Ω) |
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(high voltage output) |
Accuracy: +2% of full output for each range at 2 kHz |
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Flatness: +10% of programmed amplitude |
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Dc offset |
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Range: +5 V dc |
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Accuracy: +0.4% of full peak output for each attenuator range2 |
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Dc offset (option 002) |
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Range: +20 V dc |
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Accuracy: + (1% +25 mV) of full output for each attenuator range |
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Dc plus ac |
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Range: <1 MHz |
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Accuracy: +1.2% |
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Ramps: +2.4% |
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Range: >1 MHz |
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Accuracy: +3% |
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1Not verified below 50 Hz. |
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2Except lowest attenuator range where accuracy is ±20 μV.
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 Transfer Calibration Standards Set AN/GSM-287. Alternate items may be used by the calibrating activity. The item 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.
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TB 9-6625-2049-35
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: 50Ω feedthrough termination, Hewlett-Packard, Model 11048C.
Table 2. Minimum Specifications of Equipment Required
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Manufacturer and model |
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Common name |
Minimum use specifications |
(part number) |
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AUDIO ANALYZER |
Output: 4.5 V, 10 kHz |
Boonton, Model 1120-S/10 |
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AM distortion: ≤-30 dB at 10 kHz Distortion: |
(MIS-35954/2) |
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≤-60 dB at 50 Hz |
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FREQUENCY COUNTER |
Range: 99,9950 μs to 60,000,300 Hz |
Hewlett-Packard, Model 5345A |
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Accuracy: |
1.25 x 10-8 |
(MIS-28754/1 Type 1) |
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Capability: Time interval A to B |
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MEASURING RECEIVER |
Frequency: 100 kHz to 10 MHz |
Consisting |
of |
: Measuring |
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Volts: .683 to .732 V rms |
receiver |
Hewlett-Packard, |
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Accuracy: ±0.85% |
Model 8902A |
and Sensor |
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AM: 0 to 80% |
module Hewlett-Packard, Model |
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11722A |
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MULTIMETER |
Range: -20.225 to +20.225 V dc |
Hewlett-Packard, Model |
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Accuracy: ±0.05% |
3458A |
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Range: 0.3416 to 20.4 V ac |
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100 Hz to 100 kHz |
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Accuracy: ±0.3% |
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OSCILLOSCOPE |
Frequency: 1 kHz to 10 MHz |
Tektronix, Type 2430A |
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Amplitude: |
1.8 to 2.2 V p-p |
(OS-291/G) |
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Accuracy: ±2.5% |
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Capabilities |
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Duty cycle: 49.7 to 50.3% |
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Overshoot: 5% |
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Rise time and fall time: <20 ns |
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SPECTRUM ANALYZER |
Frequency: |
50 kHz to 20 MHz |
(AN/USM-489A(V)1) |
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Input: -20 dBm and 40 V |
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Display capability: <-65 dBc |
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SYNTHESIZER/LEVEL |
Frequency: |
0.1 MHz |
Hewlett-Packard, Model |
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GENERATOR |
Amplitude: 13 dBm |
3335AOPT 001-K06 |
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(MIS-35938) |
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TIME FREQUENCY |
Reference output frequency: 10 MHz |
Autek Systems Corporation, |
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WORKSTATION |
Accuracy: ±5 x 10-8 |
Model 620 (MIS-38946) |
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RESISTANCE STANDARD |
Range: 470Ω |
Biddle Gray, Model 71-631 |
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(7910328) |
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5
TB 9-6625-2049-35
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 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 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 TM 11-6625-3065-14 and the manufacturer's manual for this TI.
d. When indications specified in paragraphs 8 through 19 are not within tolerance, perform the power supply check prior to making adjustments. After adjustments are made, repeat paragraphs 8 through 19. Do not perform power supply check if all other parameters are within tolerance.
e. 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.
CAUTION
Before connecting TI to power source, make sure TI is set to the power source line voltage shown on rear of TI.
a. Connect TI to a 115 V ac source. Press POWER pushbutton to ON and allow at least 24 hours (72 hours for option 001) for warmup.
b. Before continuing, review (1) through (4) below:
(1)The SWEEP LINEAR/LOG, ENTRY, FUNCTION, SIGNAL, and blue keys each have an indicator denoting that it is activated.
(2)When power is applied to the TI, some keys will be lit.
(3)Pressing any FUNCTION key that is active will delete that function and no ac signal will be present at the output.
(4)Some instructions will be repeated during programming. This is done to ensure correct output is available.
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TB 9-6625-2049-35
8.Harmonic Distortion a. Performance Check
(1)Connect TI EXT REF IN 1, 10 MHz to spectrum analyzer 10 MHz REF
IN/OUT.
(2)Connect TI SIGNAL to spectrum analyzer INPUT 50Ω.
(3)Press keys and enter values using DATA keys as listed in (a) through (h) below:
(a)SIGNAL off (option 002 not lit).
(b)FUNCTION sine wave.
(c)ENTRY AMPTD.
(d)-20 dBm.
(e)ENTRY DC OFFSET.
(f)0 VOLT.
(g)ENTRY FREQ.
(h)20 MHz.
(4)Adjust spectrum analyzer controls to display 20 MHz fundamental and at least four harmonics. All harmonics will be at least 25 dB below fundamental.
(5)Enter 14 MHz using TI DATA keys. Adjust spectrum analyzer controls to display 14 MHz fundamental and at least four harmonics. All harmonics will be at least 30 dB below fundamental.
(6)Enter 1.9 MHz using TI DATA keys. Adjust spectrum analyzer controls to display 1.9 MHz fundamental and at least four harmonics. All harmonics will be at least
40dB below fundamental.
(7)Enter 190 kHz using TI DATA keys. Adjust spectrum analyzer controls to display 190 kHz fundamental and at least four harmonics. All harmonics will be at least
60dB below fundamental.
(8)Enter 100 kHz using TI DATA keys. Adjust spectrum analyzer controls to display 100 kHz fundamental and at least four harmonics. All harmonics will be at least
60dB below fundamental.
(9)Enter 40 kHz using TI DATA keys. Adjust spectrum analyzer controls to display 40 kHz fundamental and at least four harmonics. All harmonics will be at least 65 dB below fundamental.
(10)Disconnect TI from spectrum analyzer.
(11)Connect TI SIGNAL to audio analyzer INPUT HIGH using 50Ω feedthrough termination.
(12)Press keys and enter values using DATA keys as listed in (a) through (c) below:
7