HP 3325B, 3325A User Manual
*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SUPERSEDED COPY DATED 15 JANUARY 1996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
SECTION I. IDENTIFICATION AND DESCRIPTION
__________
*This bulletin supersedes TB 9-6625-2049-35, 15 January 1996.
Test instrument identification............................
Forms, records, and reports................................
Calibration description .......................................
II. EQUIPMENT REQUIREMENTS
Equipment required ............................................
Accessories required ...........................................
III CALIBRATION PROCESS
Preliminary instructions.....................................
Equipment setup .................................................
Harmonic distortion............................................
Amplitude modulation distortion........................
Square wave characteristics...............................
Ramp retrace.......................................................
Frequency accuracy............................................
Phase increment .................................................
Sine wave amplitude and flatness......................
Square wave amplitude and flatness..................
Paragraph
1 2
2 2
3 2
4 4
5 5
6 6
7 6
8 7
9 9
10 9
11 10
12 11
13 13
14 14
15 16
Page
TB 9-6625-2049-35
SECTION II
I.
Triangle and ramp amplitude ............................
Dc offset...............................................................
Dc offset with ac..................................................
High voltage output option 002 only...................
Power supply.......................................................
Final procedure...................................................
CALIBRATION PROCESS - Continued
SECTION I
Paragraph Page
16 17
17 18
18 19
19 20
20 21
21 22
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
Table 1. Calibration Description
Test instrument parameters Performance specifications
Harmonic distortion1
(relative to fundamental at
full output)
Amplitude modulation
Square wave
Ramp retrace
Frequency Accuracy: 5 x 10-6 of selected value
Sine wave
Square wave
Triangle
Positive slope ramp
Negative slope ramp
Phase offset
Amplitude
Amplitude accuracy with no Sine wave: .001 Hz to 100 kHz2
attenuation (attenuator range 1)
into 50Ω load (no dc offset )
Ramps: .001 Hz to 500 Hz
Flatness with no attenuation
(attenuator range 1) into a 50Ω load
Square wave: 100 kHz to 10 MHz
See footnotes at end of table.
Fundamental frequency: 0.1 Hz To 50 kHz
Accuracy: No harmonic greater than -65 dB
Fundamental frequency: 50 to 200 kHz
Accuracy: No harmonic greater than -60 dB
Fundamental frequency: 200 kHz to 2 MHz (200 kHz to 1 MHz
for option 002)
Accuracy: No harmonic greater than -40 dB
Fundamental frequency: 2 to 15 MHz
Accuracy: No harmonic greater than -30 dB
Fundamental frequency: 15 to 20 MHz
Accuracy: No harmonic greater than -25 dB
AM distortion: ≤-30 dB at 80% modulation, 10 kHz, and 0 V dc
offset
Rise time and fall time: ≤20 ns, (≤125 ns for option 002) at full
output
Symmetry: ≤.02% of period +3 ns
Overshoot: ≤5% of p-p amplitude at full output (<10% of peak
amplitude for option 002)
≤3 µs retrace time, positive or negative ramps
Range: 1 µHz to 20 999 999.999 Hz
(option 002: .02 Hz to 25.6 kHz)
Range: 1 µHz to 10 999 999.999 Hz
(option 002: .02 Hz to 25.6 kHz)
Range: 1 µHz to 10 999 999.999 Hz
(option 002: .02 Hz to 10 kHz)
Range: 1 µHz to 10 999 999.999 Hz
(option 002: .02 Hz to 10 kHz)
Range: 1 µHz to 10 999 999.999 Hz
(option 002: .02 Hz to 10 kHz)
Range: Variable ±719.9° with respect to arbitrary starting
phase,
or assigned zero phase
Accuracy: ±0.2°
Tolerance relative to
Square wave: .001 Hz to 100 kHz
Triangle: .001 Hz to 2 kHz
2 kHz to 10 kHz
500 Hz to 10 kHz
Sine wave: 100 kHz to 20
MHz
TB 9-6625-2049-35
programmed amplitude
±0.1 dB
±1.0%
±1.5%
±5%
±1.5%
±10%
Tolerance relative to
programmed amplitude at 1 kHz
±0.3 dB
±10%
3
TB 9-6625-2049-35
Table 1. Calibration Description - Continued
Test instrument parameters Performance specifications
Amplitude accuracy with dc
offset and no attenuation
(range 1) into 50Ω load
Sine wave: .001 Hz to 100 kHz
Square: .001 Hz to 100 kHz
Triangle: .001 Hz to 2 kHz
Ramps: .001 Hz to 500 Hz
Attenuator accuracy (these
errors are additive with the
amplitude accuracy errors)
Tolerance relative to
±0.3 dB
±3%
±4%
2 kHz to 10 kHz
500 Hz to 10 kHz
Function and frequency range
.001 Hz to 100 kHz
Attenuator ranges 2 through 8
±6%
±4%
±11%
±0.1 dB
programmed amplitude
Tolerance relative to
programmed amplitude
100 kHz to 10 MHz
Attenuator ranges 2 through 8
10 MHz to 20 MHz
Attenuator ranges 2 through 4
Attenuator ranges 5 through 8
Amplitude output Range: 1.000 mV to 10.00 V p-p
Amplitude (option 002)
(high voltage output)
Dc offset Range: +5 V dc
Dc offset (option 002) Range: +20 V dc
Dc plus ac Range: <1 MHz
1
Not verified below 50 Hz.
2
Except lowest attenuator range where accuracy is ±20 µV.
Range: 4 mV to 40 V p-p (>500Ω)
Accuracy: +2% of full output for each range at 2 kHz
Flatness: +10% of programmed amplitude
Accuracy: +0.4% of full peak output for each attenuator range2
Accuracy: + (1% +25 mV) of full output for each attenuator range
Accuracy: +1.2%
Ramps: +2.4%
Range: >1 MHz
Accuracy: +3%
±0.2 dB
0.2 dB
±0.5 dB
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.
4
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
Common name
AUDIO ANALYZER Output: 4.5 V, 10 kHz
AM distortion: ≤-30 dB at 10 kHz Distortion:
≤-60 dB at 50 Hz
FREQUENCY COUNTER Range: 99,9950 µs to 60,000,300 Hz
Accuracy: 1.25 x 10
Capability: Time interval A to B
MEASURING RECEIVER Frequency: 100 kHz to 10 MHz
Volts: .683 to .732 V rms
Accuracy: ±0.85%
AM: 0 to 80%
MULTIMETER Range: -20.225 to +20.225 V dc
Accuracy: ±0.05%
Range: 0.3416 to 20.4 V ac
100 Hz to 100 kHz
Accuracy: ±0.3%
OSCILLOSCOPE Frequency: 1 kHz to 10 MHz
Amplitude: 1.8 to 2.2 V p-p
Accuracy: ±2.5%
Capabilities
Duty cycle: 49.7 to 50.3%
Overshoot: 5%
Rise time and fall time: <20 ns
SPECTRUM ANALYZER Frequency: 50 kHz to 20 MHz
Input: -20 dBm and 40 V
Display capability: <-65 dBc
SYNTHESIZER/LEVEL
GENERATOR
TIME FREQUENCY
WORKSTATION
RESISTANCE STANDARD Range: 470Ω Biddle Gray, Model 71-631
Frequency: 0.1 MHz
Amplitude: 13 dBm
Reference output frequency: 10 MHz
Accuracy: ±5 x 10-8
Minimum use specifications
-8
Manufacturer and model
(part number)
Boonton, Model 1120-S/10
(MIS-35954/2)
Hewlett-Packard, Model 5345A
(MIS-28754/1 Type 1)
Consisting of : Measuring
receiver Hewlett-Packard,
Model 8902A and Sensor
module Hewlett-Packard, Model
11722A
Hewlett-Packard, Model
3458A
Tektronix, Type 2430A
(OS-291/G)
(AN/USM-489A(V)1)
Hewlett-Packard, Model
3335AOPT 001-K06
(MIS-35938)
Autek Systems Corporation,
Model 620 (MIS-38946)
(7910328)
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.
6
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 50ΩΩ.
(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
40 dB 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
60 dB 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
60 dB 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
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