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SUPERSEDED COPY DATED 15 JANUARY 1996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: [e-mail] or by FAX [phone]/DSN 788-6546

			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	5
	III	CALIBRATION PROCESS
		Preliminary instructions.....................................	6	6
		Equipment setup.................................................	7	6
		Harmonic distortion............................................	8	7
		Amplitude modulation distortion........................	9	9
		Square wave characteristics ...............................	10	9
		Ramp retrace.......................................................	11	10
		Frequency accuracy ............................................	12	11
		Phase increment .................................................	13	13
		Sine wave amplitude and flatness ......................	14	14
		Square wave amplitude and flatness..................	15	16

__________

*This bulletin supersedes TB 9-6625-2049-35, 15 January 1996.

TB 9-6625-2049-35

		Paragraph	Page
SECTION	II CALIBRATION PROCESS - Continued
	I.
	Triangle and ramp amplitude ............................	16	17
	Dc offset...............................................................	17	18
	Dc offset with ac ..................................................	18	19
	High voltage output option 002 only...................	19	20
	Power supply .......................................................	20	21
	Final procedure ...................................................	21	22

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.

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	Table 1.	Calibration Description
Test instrument parameters				Performance specifications
Harmonic distortion1	Fundamental frequency:				0.1 Hz To 50 kHz
(relative to fundamental at	Accuracy:		No harmonic greater than -65 dB
full output)	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
Amplitude modulation	AM distortion: ≤-30 dB at 80% modulation, 10 kHz, and 0 V dc
	offset
Square wave	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)
Ramp retrace	≤3 μs retrace time, positive or negative ramps
Frequency	Accuracy: 5 x 10-6 of selected value
Sine wave	Range:	1 μHz to 20 999 999.999 Hz
	(option 002: .02 Hz to 25.6 kHz)
Square wave	Range:	1 μHz to 10 999 999.999 Hz
	(option 002: .02 Hz to 25.6 kHz)
Triangle	Range:	1 μHz to 10 999 999.999 Hz
	(option 002: .02 Hz to 10 kHz)
Positive slope ramp	Range:	1 μHz to 10 999 999.999 Hz
	(option 002: .02 Hz to 10 kHz)
Negative slope ramp	Range:	1 μHz to 10 999 999.999 Hz
	(option 002: .02 Hz to 10 kHz)
Phase offset	Range:	Variable		±719.9°		with		respect to arbitrary starting
	phase,
	or assigned zero phase
	Accuracy:		±0.2°
								Tolerance relative to
Amplitude								programmed amplitude
Amplitude accuracy with no	Sine wave: .001 Hz to 100 kHz2							±0.1 dB
attenuation (attenuator range 1)	Square wave: .001 Hz to 100 kHz							±1.0%
into 50Ω load (no dc offset )	Triangle: .001 Hz to 2 kHz							±1.5%
	2 kHz to 10 kHz							±5%
	Ramps: .001 Hz to 500 Hz							±1.5%
	500 Hz to 10 kHz							±10%
Flatness with no attenuation								Tolerance relative to
(attenuator range1)intoa50Ωload								programmed amplitude at 1 kHz
	Sine wave:		100	kHz	to	20		±0.3 dB
	MHz
	Square wave: 100 kHz to 10 MHz							±10%

See footnotes at end of table.

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TB 9-6625-2049-35

Table 1. Calibration Description - Continued

Test instrument parameters			Performance specifications
Amplitude	accuracy	with dc			Tolerance relative to
offset and	no	attenuation			programmed amplitude
(range 1)	into 50Ω load
			Sine wave: .001 Hz to 100 kHz		±0.3 dB
			Square: .001 Hz to 100 kHz		±3%
			Triangle: .001 Hz to 2 kHz		±4%
			2 kHz to 10 kHz		±6%
			Ramps: .001 Hz to 500 Hz		±4%
			500 Hz to 10 kHz		±11%
					Tolerance relative to
			Function and frequency range		programmed amplitude
Attenuator accuracy (these			.001 Hz to 100 kHz		±0.1 dB
errors are additive with the			Attenuator ranges 2 through 8
amplitude accuracy errors)
			100 kHz to 10 MHz		±0.2 dB
			Attenuator ranges 2 through 8
			10 MHz to 20 MHz
			Attenuator ranges 2 through 4		0.2 dB
			Attenuator ranges 5 through 8		±0.5 dB
Amplitude output			Range: 1.000 mV to 10.00 V p-p
Amplitude (option 002)			Range: 4 mV to 40 V p-p (>500Ω)
(high voltage output)			Accuracy: +2% of full output for each range at 2 kHz
			Flatness: +10% of programmed amplitude
Dc offset			Range: +5 V dc
			Accuracy: +0.4% of full peak output for each attenuator range2
Dc offset (option 002)
			Range: +20 V dc
			Accuracy: + (1% +25 mV) of full output for each attenuator range
Dc plus ac
			Range: <1 MHz
			Accuracy: +1.2%
			Ramps: +2.4%
			Range: >1 MHz
			Accuracy: +3%
1Not verified below 50 Hz.

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

			Manufacturer and model
Common name	Minimum use specifications		(part number)
AUDIO ANALYZER	Output: 4.5 V, 10 kHz		Boonton, Model 1120-S/10
	AM distortion: ≤-30 dB at 10 kHz Distortion:		(MIS-35954/2)
	≤-60 dB at 50 Hz
FREQUENCY COUNTER	Range: 99,9950 μs to 60,000,300 Hz		Hewlett-Packard, Model 5345A
	Accuracy:	1.25 x 10-8	(MIS-28754/1 Type 1)
	Capability: Time interval A to B
MEASURING RECEIVER	Frequency: 100 kHz to 10 MHz		Consisting	of	: Measuring
	Volts: .683 to .732 V rms		receiver	Hewlett-Packard,
	Accuracy: ±0.85%		Model 8902A		and Sensor
	AM: 0 to 80%		module Hewlett-Packard, Model
			11722A
MULTIMETER	Range: -20.225 to +20.225 V dc		Hewlett-Packard, Model
	Accuracy: ±0.05%		3458A
	Range: 0.3416 to 20.4 V ac
	100 Hz to 100 kHz
	Accuracy: ±0.3%
OSCILLOSCOPE	Frequency: 1 kHz to 10 MHz		Tektronix, Type 2430A
	Amplitude:	1.8 to 2.2 V p-p	(OS-291/G)
	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	(AN/USM-489A(V)1)
	Input: -20 dBm and 40 V
	Display capability: <-65 dBc
SYNTHESIZER/LEVEL	Frequency:	0.1 MHz	Hewlett-Packard, Model
GENERATOR	Amplitude: 13 dBm		3335AOPT 001-K06
			(MIS-35938)
TIME FREQUENCY	Reference output frequency: 10 MHz		Autek Systems Corporation,
WORKSTATION	Accuracy: ±5 x 10-8		Model 620 (MIS-38946)
RESISTANCE STANDARD	Range: 470Ω		Biddle Gray, Model 71-631
			(7910328)

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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