HP 8444A User manual

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MANUAL CHANGES
r- MANUAl IDENTIFICATION_.
Model Number:
. Date Printed:
Part Number:
8444A
Jan 1972.
08444-90005
This supplement contains important information for correcting manual errors and for adapting the manual to
instruments containing improvements made after the printing of the manuaL
To use this supplement:
Make all ERRATA corrections
Make
all appropriate serial number related changes indicated in the tables below.
..----Serial Prefix or Number_,-- Make Manual Changes- r- Serial Prefix or Number-- Make Manual Changes-
1208A 1
1215A .. 1,2
~ 1323A 1,2,3
~NEW ITEM
ERRATA
Page 8-19, Figure 8-17:
Change wire 92 to 934.
CHANGE 1
Pages 6-3 through 6-5, Tal)le 6-2, change to read as follows:
A2R29 0757-0465 R:FXD
MET FLM lOOK OHM 1% 1/8W.
A2R36 0757-0439 R:FXD MET FLM 6.81K
OHM 1% 1/8W.
A4A1C2 0160-3456 C:FXD CER 1000 PF 10% 250 VDCW.
A7 08444-60019 OSCILLATOR ASSY: 1.55 GHz NOT RECOMMENDED FOR FIELD REPAIR.
A7Cl 0160-3827 C:FXD PORC 1 PF 500
VDCW.
A7C4 0160-2437 C:FXD CER 5000 PF +80-20% 200 VDCW.
A7Rl 0698-7230 R:FXD MET FLM 562 OHM 2% 1/8W.
C3 0160-0155 C:FXD MY 0.0033 UF 10% 200 VDCW.
R5 0757-0438 R:FXD MET FLM 5.11K OHM 1%1/8 W.
NOTE
A7C4 is item number 30 on Figure 8-19.
Page 8-15, Figure 8-12, Service Sheet 3:
Replace
with attached figure.
Page 8-21, Figure 8-19:
Replace with attached figure.
NOTE
Manual change supplements are revised as often as necessary to keep manuals as current and accurate as possible.
Hewlett-Packard recommends that you periodically request the latest edition of this supplement. Free copies are available
from all HP offices. When requesting copies quote the manual identification information from your supplement, or the model
number and print date from the title page of the manual.
25 July 1973
6
Pages
Printed in U.S.A.
HEWLETT. PACKARD

Model8444A 08444-90005
CHANGE 1 (cont'd)
Pages 5-3 through 5-6, Paragraph 5-9 and Figure 5-2, change to read as follows:
5-9. 1.55 GHz Oscillator Power level, Frequency Check and Adjustment
REFERENCE: Service Sheet 3.
DESCRIPTION: The 1.55 GHz local oscillator is checked for power output level and frequency
tuning range. Oscillator frequency is determined primarily by the LO cavity, with tuning range
determined by the drive voltage from the oscillator driver. The oscillator is checked first for
power level and then for frequency and tuning range.
FREQUENCY COUNTER
POWER METER
DIGITAL VOLTMETER
CABLE ASSEMBLY
1~11
TEST LEADS
THERMISTOR MOUNT
Figure 5-2. 1.55 GHz LO Power Level and Frequency Check and Adjustment Test Setup
EQUIPMENT:
Power Meter with HP 84 78B Thermistor Mount . . . . . . . . . . . . . . . HP 432A
Frequency Counter with HP 5254C Plug-in . . . . . . . . . . . . . . . . . . . HP5245L
Digital Voltmeter with HP 3443A Plug-in . . . . . . . . . . . . . . . . . . . HP 3440A
Test Leads (dual banana plug to probe and alligator clip) . . . . . . HP 11003A
Cable Assy, SMA male to BNC male. . . . . . . . . . . . . . . . . . . HP 08555-60076
Cable Assy, male BNC connectors . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A
Coaxial Attenuator, Option 010.. . . . . . . . . . . . . . . . . . . . . . . . . . HP 8491A
Adapter BNC barrel (HP Part Number 1250-0080) . . . . . . . . . . . UG 914A/U
Adapter (BNC to Type N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UG 201A/U
PROCEDURE:
1. Perform Power Supply Check and Adjustment, paragraph 5-8.
2. Apply power to Tracking Generator and allow 1 hour for instrument to warm up and stabilize.
3. Disconnect Cable W8 at Isolator AT3 J2 (see Figures 8-4 and 8-12).
4. With
test setup as indicated in Figure 5-2, connect Power Meter to Isolator AT3 J2 via 08555-60076
cable, 10 dB attenuator and UG 914A/U adapter.
5. Rotate TRACK ADJ control throughout its tuning range while noting power level indicated on Power
Meter.
6.
Minimum power output must be greater than +5 dBm.
>+5dBm __
7. Connect Frequency Counter to Isolator AT3 J2 via 08555-60076 cable, UG 914A/U adapter and BNC
to BNC cable.
2

Model8444A
08444-90005
CHANGE 1 (cont'd)
8. Rotate TRACK ADJ control fully counterclockwise and record oscillator frequency.
1,548,000 ±500kHz __
9. Rotate TRACK ADJ control fully clockwise and record oscillator frequency
1,552,000 ±500kHz __
10. Record frequency tuning range (frequency recorded in step 9 minus frequency recorded in step 8).
4,000 ±500kHz. __
lL If data recorded in steps 8, 9, and 10 is within tolerance no adjustment is required.
12. If data recorded in steps 8, 9, or 10 is not within tolerance proceed with step 13.
13. Connect Digital Voltmeter to test point A2TP5.
14. Set TRACK ADJ control fully clockwise. Set "MAX" TUNE potentiometer A2R26 and "MIN" TUNE
potentiometer A2R27 fully counterclockwise. Measure voltage at A2TP5. Voltage should be +1 ±
0.1 Vdc.
+0.9
__ +1.1 Vdc
15. Measure and record oscillator frequency.
16. Adjust "MAX" TUNE potentiometer A2R26 to increase oscillator frequency 4,000 ±50 kHz above
frequency recorded in step 15. Record oscillator frequency.
17. Set TRACK ADJ control to center of tuning range recorded in steps 15 and 16 above. Record
oscillator frequency.
18. If frequency recorded in step 17 is not within ± 500 kHz of 1.550 GHz adjust A7 ADJ 1 to tune
oscillator freuqency to 1.550 GHz ±100kHz.
19. If oscillator frequency is adjusted, repeat steps 15 through 18.
20. Disconnect Power Meter and connect W8 Cable to Isolator AT3 J2.
21. Replace right side panel cover.
CHANGE 2
Page 1-2, Table 1-1, change Spectral Purity: Harmonic Distortion specification to read:
Harmonic Distortion: Typically 25 dB below
output level.
Page 4-13, Paragraph 4-20, Harmonic Distortion, change SPECIFICATION to read:
Harmonic Distortion: Typically
25 dB below output level. Nonharmonic (spurious) signals: >40 dB below output level.
Page 4-15, Paragraph 4-20, change to read:
12. Note and record maximum amplitude level
of harmonic and spurious signals.
Harmonics Typically
~-25 dBm
Spurious
~-40 dBm
3

Model8444A
~CHANGE J
Page 1-2, Table 1-1:
Change "Nonharmonic (Spurious) Signals" under Spectral Purity to >35 dB below output level.
Page 4-13, Paragraph 4-20:
Change
"Nonharmonic (Spurious) Signals" in Specification to read:
>
35 dB below output leveL
Page 4-15, Paragraph 4-20, Step 12:
Change spurious to ,:;::; -35 dBm.
Page 4-16, Table 4-1:
Change -40 to -35 for paragraph 4-20, Spurious Signal Level.
08444-90005
4

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Figure 8-12. First Converter Circuits,
Schematic
Diagram (for
CHANGE
1)
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Model8444A
Figure 8-19. A 71.55 GHz Oscillator Assembly, Illustrated
Parts Breakdown (1
of 2) (for CHANGE 1)
08444-90005
6