HP 8673m schematic

*TB 9-6625-2155-35

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SUPERSEDED COPY DATED 1 MAY 1989

DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

CALIBRATION PROCEDURE FOR

SIGNAL GENERATOR SG-1219/U

(HEWLETT-PACKARD, MODEL 8673M)

Headquarters, Department of the Army, Washington, DC

6 December 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-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 e­mail address: [e-mail] or by FAX [phone]/DSN 788-6546.

Paragraph Page

SECTION I. IDENTIFICATION AND DESCRIPTION

Test instrument identification
Forms, records, and reports

Calibration description ................................

II. EQUIPMENT REQUIREMENTS

Equipment required ................................

Accessories required ................................

III. CALIBRATION PROCESS

Preliminary instructions ................................

Equipment Setup ................................

Display resolution and accuracy
Single sideband phase noise
Harmonics, subharmonics, multiples

RF output level ................................

Pulse modulation................................

Amplitude modulation................................

Frequency modulation................................

Power supply................................

Final procedure................................

and nonharmonic spurious signals

1 2
2 2
3 2

4 3
5 3

6 4
7 5
8 6
9 9

10
11 12
12 18
13 22
14 26
15 30
16 32

10

__________
*This bulletin supersedes TB 9-6625-2155-35, dated 1 May 1989, including all changes.

TB 9-6625-2155-35

SECTION I

IDENTIFICATION AND DESCRIPTION

1. Test Instrument Identification. This bulletin provides instructions for the

calibration of Signal Generator, SG-1219/U (Hewlett-Packard, Model 8673M). The
manufacturer’s manual and TM 9-6625-3143-40 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. None.
b. Time and Technique. The time required for this calibration is approximately 8

hours, using the dc and low frequency and microwave techniques.

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 listed in table 1.

Table 1. Calibration Description

Test instrument parameters Performance specifications
Display accuracy and
resolution 2 to 18 GHz
Single sideband
phase noise
Harmonics:
Subharmonics
Spurious signals
Reference oscillator Accuracy: 1 x 10
RF output level

Level accuracy:

2.0 to 12.0 GHz
>12.0 to 18.0 GHz
Pulse modulation:

RF pulse width
Maximum peak power
Overshoot
Undershoot

See footnotes at end of table.

Display: ± 500 kHz
Resolution: 3 kHz
<-60 dBc 1 kHz offset from carrier

<-40 dBc
<-35 dBc
<-50 dBc

Range: +8 dBm to -120 dBm2

±2.0 dB (+8 to -60 dBm output level)
±3.5 dB (-61 to -120 dBm output level)

±3.0 dB (+8 to -60 dBm output level)
±4.5 dB (-61 to -120 dBm output level)

>80 ns
+3 dBm
<20% of carrier level
<20% of carrier level

-8

per 10 s1

/

2

1
2
3

Table 1. Calibration Description - Continued

Test instrument parameters Performance specifications
Amplitude modulation:
Meter accuracy
Depth

Rates
Incidental FM

Frequency modulation:
Meter accuracy
Frequency response relative to a
100 kHz rate
Maximum deviation

Distortion
Incidental AM

As per CECOM specification.
Calibrated to -90 dBm.
Procedure limitation (see text).

EQUIPMENT REQUIREMENTS

TB 9-6625-2155-35

± 7% of reading ± 3% of range
0 to 75%: 2.0 to 18.0 GHz
0 dBm maximum carrier level

10 Hz to 50 kHz: 3 dB bandwidth
30% depth
<10 kHz p-p3: 30% modulation depth

±7% of reading ±3% of range
±3 dB, 50 Hz to 2 MHz

10 MHz 50 kHz to 1 MHz modulation rate
10 MHz/V deviation range
<5% 100 kHz rate at 1 MHz peak deviation
<5% Rates <100 kHz; peak deviations <1 MHz

SECTION II

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 or AN/GSM-705. 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 four­to-one ratio between the standard and TI.

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:
Mixer, RHG Model DM 1-18A (P/N 21-159-2).

Table 2. Minimum Specifications of Equipment Required

Minimum use Manufacturer and model

Common name specifications (part number)
ATTENUATOR SET
(FIXED)
AUDIO ANALYZER Range: 1.0 to 100.0 kHz

FREQUENCY
DIFFERENCE METER

Range: 2 to 18 GHz
Accuracy: (See test report)

Accuracy: <2.0%
Range: 10 MHz
Resolution: 1 part in 10-8

Weinschel, Model 9918 (9918)

Boonton, Model 1120/S10
(MIS-35954/2)
Tracor, Model 527E
(MIS-10318)

3

TB 9-6625-2155-35

Table 2. Minimum Specifications of Equipment Required - Continued

Minimum use Manufacturer and model

Common name specifications (part number)
MEASURING RECEIVER Range: 2.0 to 18 GHz

Range: +8 to -74.5 dBm
Accuracy: +.5 dB
Range: AM 0 to 80%
Accuracy: ±2% at 1 kHz
Range: FM .05 to 100 kHz
Accuracy: ±2% at 1 kHz
Deviation: ±12 kHz

MULTIMETER Range: 0 to 40 V dc

Accuracy: 0.01%

OSCILLOSCOPE Range: 5.0 V at 100 ns

Accuracy: 3.0%

PULSE GENERATOR Range: Period 10 µs

Accuracy: Determined by oscilloscope

SIGNAL GENERATOR Range: Output level +8 dBm

Frequency range: 2 to 18 GHz

SPECTRUM ANALYZER Range: 2.0 to 18 GHz at +10 to –60 to dBm

Accuracy: ±0.2% of the center frequency +20%
of the span/div
Range: Span 500 Hz to 20 MHz

Accuracy: ±5%
TIME/FREQUENCY
WORKSTATION

Frequency: 1 MHz

Accuracy: 5 parts in 1010 per day

Hewlett-Packard, Model
8902A (8902A) w/sensor
module, Model 11792A
(11792A) and converter,
Model 11793A (11793A)

John Fluke, Model 8840A/AF
05/09 (AN/GSM-64D)
Tektronix, Type 2465BOPT46
(2465BOPT46)
Lecroy Model 9210 (9210)
with plug-in, Model 9211
(9211)
(SG-1219/U)

(AN/USM-489A)

Autek Systems, Model 620
(MIS-38946)

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 and item identification number 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.
Additional maintenance information is contained in the manufacturer’s manual and TM 9­6625-3143-40 for this TI.

d. When indications specified in paragraphs 8 through 14 are not within tolerance,
perform the power supply check prior to making adjustments. After adjustments are made,
repeat paragraphs 8 through 14. 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.

4

TB 9-6625-2155-35

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.

a. Remove TI from protective cover only as necessary to make adjustments.

NOTE

Refer to the table 2 for equipment models required and their
designated IEEE addresses. The TI must be connected to
controller GPIB1 IEEE interface card and all standards must
be connected to GPIB0.

NOTE

For the remainder of this procedure the SG-1219/U connected
to the measuring receiver will be called the local oscillator.

NOTE

Many indications, such as MESSAGE, ∆∆F, SWEEP FREQ
START, etc., will only appear when the appropriate entry

pushbutton is pressed and held in the IN position.
b. Connect TI to a 115 V ac power source.
c. Set LINE switch to ON and allow a 2-hour warm-up and stabilization.
d. Connect FREQUENCY STD INT connector of TI to SIG INPUT of frequency

difference meter. Set FREQUENCY STANDARD INT/EXT SWITCH to INT.
e. Connect 1 MHz output of time/frequency workstation to REF INPUT of the

frequency difference meter.
f. Adjust FREQ adjust A3A8 (fig. 1) for minimum frequency difference meter

indication.

g. Verify oscillator drift is less than 1 part in 10-8 per 10 s.

5

TB 9-6625-2155-35

ADDRESS 9

488

GPIB 1

GPIB 0

1219/U

ADDRESS 19

MEASURING

Figure 1. Frequency adjust location.

h. Replace TI top cover.
i. Disconnect frequency difference meter from the TI and the time/frequency

workstation.

8. Display Resolution and Accuracy
a. Performance Check
(1) On the local oscillator rear panel disconnect the jumper between FREQ

STANDARD INT/EXT connectors and set the INT/EXT switch to EXT.
(2) Connect the local oscillator 10 MHz OUT to the measuring receiver TIME

BASE 10 MHz INPUT.
(3) Connect TI 10 MHz OUT (rear panel) to the local oscillator FREQ STANDARD

EXT connector.

(4) Finish connection as shown in figure 2.

TO: IEEE-488

AUDIO ANALYZER

ADDRESS 23

RECEIVER

ADDRESS 14

SG-

6

TO: IEEE-

TEST INSTRUMENT

SENSOR MODULE
( H-P MODEL 11792A)

Figure 2. Frequency resolution hookup.

TB 9-6625-2155-35

(5) Press TI keys as listed in (a) through (f) below.
(a) RCL 0.

(b) Adjust OUTPUT LEVEL for 0 dB.
(c) ALC INTERNAL on.
(d) RF OUTPUT on.
(e) FREQ INCR, 1, kHz.
(f) FREQUENCY, 4, GHz.

(6) Set local oscillator and measuring receiver to measure 4 GHz, using the local
oscillator, and measuring receiver offset frequencies listed in table 3.

(7) Record the measuring receiver frequency indication as reference.
(8) Calculate the minimum and maximum limits for the 4 GHz rows in table 3 using

the formula below:

Minimum = (Reference + TI increment amount) – FREQ INCR setting

Maximum = (Reference + TI increment amount) +FREQ INCR setting
(9) Press the TI FREQ INCREMENT up arrow key three times as indicated in

table 3, and verify that the indication is within the tolerances calculated in (8) above.
(10) Press the TI FREQ INCREMENT down arrow key four times as indicated in

table, and verify that the indication is within the tolerances calculated in (8) above.
(11) Repeat (5)(e) through (10) above for settings of FREQUENCY 8 GHz with

FREQ INCR of 2 kHz, and FREQUENCY 15 GHz with FREQ INCR of 3 kHz.

Table 3. Frequency Increment

Local

oscillator

(GHz)

4.12053 4120.530 4.000000

4.12053 4120.530 4.000000

8.12053 8120.530 8.000000

8.12053 8120.530 8.000000

15.12053 15120.530 15

15.12053 15120.530 15

Measuring

receiver

offset

(MHz)

Frequency

(GHz)

Test instrument

Step

increment

direction

UPUPUP

DNDNDNDN

UPUPUP

DNDNDNDN

UPUPUP

DNDNDNDN

Increment

amount

.003

-.001
.006

-.002
.009

-.003

Tolerance

Min Max

(12) Press TI keys as listed in (a) through (f) below.
(a) RCL 0.

(b) Adjust OUTPUT LEVEL for 0 dB.
(c) ALC INTERNAL on.

7

TB 9-6625-2155-35

(d) RF OUTPUT on.
(e) FREQ INCR, 1, 1, 1, ., 1, 1, 3, and MHz.
(f) FREQUENCY, 2, GHz.

(13) Set local oscillator and measuring receiver to measure 2 GHz, using the local
oscillator, and measuring receiver offset frequencies listed in table 4.

(14) Verify that the measuring receiver indicates within tolerances listed in table 4.
(15) Repeat (12)(e) through (14) above for remaining settings in table 4 verifying

measuring receiver indicates within the tolerances listed.

Table 4. Frequency Resolution

Test instrument

Local

oscillator

(GHz)

2.120530 2120.530 2 111.113 1999.99700M 2000.00300M

2.231643 2231.643 UP 2111.11000M 2111.11600M

2.342756 2342.756 UP 2222.22300M 2222.22900M

2.453869 2453.869 UP 2333.33600M 2333.34200M

2.544982 2544.982 UP 2444.44900M 2444.45500M

2.676095 2676.095 UP 2555.56300M 2555.56800M

2.787208 2787.208 UP 2666.67600M 2666.68100M

2.898321 2898.321 UP 2777.78800M 2777.94000M

3.009434 3009.434 UP 2888.90100M 2888.90700M

3.120530 3120.530 2 1000 UP 2999.99700M 3000.00300M

4.120530 4120.530 UP 3999.99700M 4000.00300M

5.120530 5120.530 UP 4999.99700M 5000.00300M

6.120530 6120.530 UP 5999.99700M 6000.00300M

7.120530 7120.530 UP 6999.99700M 7000.00300M

8.120530 8120.530 UP 7999.99700M 8000.00300M

9.120530 9120.530 UP 8999.99700M 9000.00300M

10.12053 10120.53 UP 9999.99700M 10000.00300M

11.12053 11120.53 UP 10999.99700M 11000.00300M

12.12053 12120.53 UP 11999.99700M 12000.00300M

13.12053 13120.53 UP 12999.99700M 13000.00300M

14.12053 14120.53 UP 13999.99700M 14000.00300M

15.12053 15120.53 UP 14999.99700M 15000.00300M

16.12053 16120.53 UP 15999.99700M 16000.00300M

17.12053 17120.53 UP 16999.99700M 17000.00300M

18.12053 18120.53 UP 17999.99700M 18000.00300M

Measuring

receiver

offset

(MHz)

Frequency

(GHz)

Step

increment

setting

Step

increment

direction

Signal generator workstation

Minimum

indications

Maximum

(16) Disconnect TI 10 MHz OUT (rear panel) from the local oscillator FREQ
STANDARD EXT connector.

(17) Reconnect the jumper between the local oscillator FREQ STANDARD

INT/EXT connector.

8

(18) Set local oscillator INT/EXT switch to INT position.

ADDRESS 10

b. Adjustments. No adjustments can be made.

9. Single Sideband Phase Noise
a. Performance Check

(1) Connect equipment as shown in figure 3.

SPECTRUM ANALYZER

TO: IEEE 488

GPIB 0

TB 9-6625-2155-35

TO: IEEE 488

GPIB 1

TEST INSTRUMENT

ADDRESS 9

Figure 3. Sideband phase noise hookup.

INPUT
50ΩΩ

(2) Press TI keys as listed in (a) through (e) below.
(a) RCL 0.

(b) Adjust OUTPUT LEVEL for 8 dB.
(c) ALC INTERNAL on.
(d) RF OUTPUT on.
(e) FREQUENCY, 5, ., 9, 9, 9, GHz.

(3) Set spectrum analyzer as listed in (a) through (f).

(a) PRESET.
(b) AMPLITUDE REF LVL to 8 dBm.
(c) All markers off.
(d) FREQUENCY CENTER FREQ to 5.999 GHz.
(e) VIDEO BW and RES BW to AUTO.
(f) SPAN to 1 MHz.

(4) Allow spectrum analyzer to sweep signal a couple of times then set spectrum
analyzer as listed in (a) through (d) below:

9

TB 9-6625-2155-35

ADDRESS 9

IN/OUT

GPIB 1

GPIB 0

ADDRESS 10

(a) PEAK SEARCH.
(b) SIG TRK ON.
(c) SPAN 2.5 kHz.
(d) VIDEO BW 10 Hz.
(5) Allow spectrum analyzer to sweep signal for approximately 50 seconds then set

spectrum analyzer as listed in (a) through (d) below.
(a) PEAK SEARCH.

(b) MKRNOISE on.
(c) TRACE, view A.
(d) MARKER DELTA 1 kHz.

(6) Spectrum analyzer ∆∆MKR will indicate less than or equal to the minimum
indication listed in table 5.

(7) Repeat technique of (2) through (6) above for remaining frequencies listed in
table 5.

Table 5. Side Band Phase Noise 1 kHz Removed

Test instrument

frequency

(GHz)

5.999 -62.5
12 -62.5
18 -62.5

Spectrum analyzer

indication

(dB)

minimum (≤)

b. Adjustments. No adjustments can be made.

10. Harmonics, Subharmonics, Multiples and Non-harmonic Spurious Signals
a. Performance Check

(1) Connect equipment as shown in figure 4 below.

SPECTRUM ANALYZER

TO: IEEE 488

TO: IEEE 488

IEEE

TEST INSTRUMENT

Figure 4. Harmonic, Subharmonic, Multiples and Non-harmonic spurious hookup.

INPUT

TO: 10 MHZ REF

TO: 10 MHZ REF
OUT

10