HP 8340b User manual

HP 8340B
SYNTHESIZED SWEEPER
(Including Options 001, 004,
005,006, and 007)
HP 8341B
SYNTHESIZED SWEEPER
(Including Option 004)
SERIAL NUMBERS
This manual applies directly to the HP 8340B Synthesized
Sweeper having a serial number prefix of 2624A and the HP8341B
Synthesized Sweeper prefixed 2624A.
For additional information about serial numbers, refer to
INSTRUMENTS COVERED BY THE MANUAL in Section I.
• Manual Changes Supplement Print Date: 18 MAY 1988 Rev. 8
Change 1 documents serial number prefix 2634A.
Change 2 documents serial number prefix 2643A.
Change 3 documents serial number prefix 2650A.
Change 4 documents serial number prefix 2730A.
Change 5 documents serial number prefix 2802A.
Change 6 documents serial number prefix 2804A.
Change 7 documents serial number prefix 281 2A.
• Change 8 documents serial number prefix 281 9A.
o CopyrIght HEWLETT-PACKARD COMPANY 1986
1400 POUNTAINGROvE PARKWAY, SANTA ROSA, CA 95401 U.S.A.
MANUAL PART NO. 06340-90243
Microfiche Part Number 06340-90244 Printed: AUGUST 1986
K4~3
HEWLETT
PACKARD

CERTIFICATION
Hewlett-Packard Company certifies that this product met its published specifications at the time of shipment
from the factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the
United States National Bureau of Standards, to the extent allowed by the Bureau’s calibration facility, and to
the calibration facilities of other International Standards Organization members.
WARRANTY
This Hewlett-Packard instrument product is warranted against defects in material and workmanship for a
period of one year from date of delivery, or, in the case of certain major components listed in section six of
this Operating and Service manual, for the specified period. During the warranty period, Hewlett-Packard
Company will, at its option, either repair or replace products which prove to be defective.
For warranty service or repair, this product must be returned to a service facility designated by HP. Buyer
shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer.
However, Buyer shall pay all shipping charges, duties, and taxes for products returned to HP from another
country.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by
Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of
the environmental specifications for the product, or improper site preparation or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES. HP SHALL NOT
BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.
ASSISTANCE
Product maintenance agreements and other customer assistance agreements are available for Hewlett-Pack -
ard products.
For any assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addresses are provided
at the back of this manual.

~I
HEWLETT
Hewlett-Packard Company
Video Communications Division
5:301 Stevens Creek Boulevard
P0 Box 581)59
Santa Clara. Caiifornia 95052-80YJ
408/246-4:300
October 30, 1997
Jim Canton
Government -Industry Data Exchange Program
GIDEP Operations Center
Corona, California 91718-8000
Subject: COPYRIGHT RELEASE
Dear Mr. Canton:
Attached is the Copyright Document Release form you sent to me.
Inregardsto thedocuments you have listed on your form thereproduced documents
must include the following legendand disclaimer:
“Copyright - Hewlett-Packard Company (HP). Reproduced with liP permission.
Hewlett-Packard makes no warranty of any kind with regard to this material, including,
butnot limited to, the implied warranties of merchantability and fitness for a particular
purpose. Hewlett-Packard is not liable forerrors containedherein or for incidental or
consequential damages in connectionwiththe furnishing, performance or use of this
material or data.’
Please let me know, if you have any questions or if I can be of any further assistance.
Sincerely,
HEWLETT-PACKARD COMPANY
DixieLuebcke
GIDEP Representative U7

VOLUME 2
TABLE OF CONTENTS
SECTION IV PERFORMANCE TESTS
Introduction
Calibration Cycle
Recommended Test Equipment
4-1. Internal Time Base Aging Rate
4-2. Frequency Range and
CW Mode Accuracy
4-3. Sweep Time Accuracy
4-4. Swept Frequency Accuracy
4-5. Maximum Leveled Output Power
and Power Accuracy Test
4-6. External Leveling
4-7. Spurious Signals Test
(10 MHz to 22 GHz - HP 8340B only)
(10 MHz to 20 GHz - HP 8341 B)
4-8. Spurious Signals Test, 22 to 26.5 GHz
(Applies only to HP 8340B)
4-9. Single Sideband Phase Noise
4-10. Power Sweep Test
4-11. Pulse Modulation On/Off Ratio Test
4-12. Pulse Modulation
Rise and Fall Time Test
4-13. Pulse Modulation Accuracy Test
4-14. Pulse Modulation Video
Feedthrough Test
4-15. Amplitude Modulation Test
4-16. FM Accuracy and Flatness
4-17. HP 8340B/41B HP-lB Operation
Verification Test
Test Record
4-1
4-1
4-3
4-9
4-13
4-19
4-21
4-25
4-33
4-37
4-41
4-45
4-53
4-55
4-57
4-63
4-67
4-71
4-75
4-83
4-89
AUTOMATED TEST PROCEDURES
SECTION V ADJUSTMENTS
Introduction
Safety Considerations
5-1
5-1
Equipment Required
Adjustment Tools
Factory Selected Components
Related Adjustments
Location of Test Points and Adjustments . .
Accessing and Storing Calibration Constants
Introduction
Procedure to Access Calibration Constants
Procedure to Store the Calibration Constants
5-1
5-2
5-2
5-2
5-2
5-2
5-2
5-3
5-3
5-1. +22 VDC Power Supply, A35 5-13
5-2. 10 MHz Standard Adjustment, ASi .... 5-15
5-3. 100 MHz Voltage-Controlled
Crystal Oscillator (VCXO), A30 S-19
5-4. M/N Loop, A32, A33, and A32A1 5-23
5-5. 20/30 Loop Phase Lock, A36, A38,
A39, A40, and A43 5-27
5-6. YO Pretune DAC, A54 5-37
S-7. YO Main Driver, ASS 5-39
S-8. YO Loop Adjustments 5-43
5-9. FM Accuracy and FM
Overmod Adjustment S-S3
S-la. YO Delay Compensation, A54 5-S7
5-11. 3.7 GHz Oscillator, A8 5-63
5-12. Marker/Bandcross, A57 5-65
5-13. Sweep Generator, A58 5-67
5-14. Unleveled RF Output Adjustments S-71
S-iS. ALC Adjustments 5-89
5-16. Leveled RF Output Adjustments 5-101
S-17. RE Output Power
Flatness Adjustment 5-uS
S-18. Pulse Adjustments S-121
S-19. External Module
Leveling Adjustment S-129
HP 8340B/41B Table of contents i/u

Section IV: Performance Tests
INTRODUCTION
The procedures in this section test the HP 8340B and HP 8341B’s electrical performance using the
specifications given in Section I as the performance standards. These tests are intended for use in
incoming inspection, calibration verification, and post-repair performance verification. All tests can be
performed without access to the interior of the instrument. An HP-lB Operation Verification procedure
is also provided at the end of this section to verify proper HP-lB operation of the instrument.
RECOMMENDED TEST EQUIPMENT
Table 4-2 is a complete list of all required equipment for the tests and adjustments supplied in Section
IV, Performance Tests, and Section V, Adjustments. Test equipment other than that noted in the table
may be substituted if it meets or exceeds the critical specifications indicated in the table.
TEST RECORD
Results of the Performance Test procedures may be tabulated on the test record card located at the
end of this section. Each test lists all of the tested specifications and their acceptable limits. The
results recorded at incoming inspection can be used for comparison in periodic maintenance and
troubleshooting and after repairs or adjustments have been made.
CALIBRATIONCYCLE
This instrument requires periodic verification of performance. The instrument should be checked
using the following performance tests at least once every year.
NOTE
The acronym “DUT” (Device Under Test) is used to describe the HP
8340B or 8341B (HP 8340B/41B) under test. The acronym “LO” S USed to
describe the Local Oscillator.
Options 001, OOS, 006, and 007 apply only to HP 8340B’s.
HP 8340B/41B Performance Tests 4-1

Table 4-1. List of Manual Performance Tests1
Test Number Performance Test Title Page
4-1 Internal Time Base Aging Rate 4-9
4-2 Frequency Range and CW Mode Accuracy 4-13
4-3 Sweep Time Accuracy 4-19
4-4 Swept Frequency Accuracy 4-21
4-5 Maximum Leveled Output Power and Power Accuracy 4-25
4-6 External Leveling 4-33
4-7 Spurious Signals Test (10 MHz to 22 GHz - HP 8340B) 4-37
(10 MHz to 20 GHz - HP 8341 B)
4-8 Spurious Signals Test (22 to 26.5 GHz - HP8340B only) 4-41
4-9 Single Sideband Phase Noise 4-45
4-10 Power Sweep Test 4-53
4-11’ Pulse Modulation ON/OFF Ratio Test 4-55
4~121 Pulse Modulation Rise and Fall Time Test 4-57
4~131 Pulse Modulation Accuracy Test 4-63
4~141 Pulse Modulation Video Feedthrough Test 4-67
4-15 Amplitude Modulation Test 4-71
4-16 FM Accuracy and Flatness 4-75
4~172 HP-lB Operation Verification Test 4-83
1. This test is not applicable to instruments equipped with Option 006, Delete Pulse Modulation.
2. This is not a Performance Test. It is included as an additional aid to determine that the HP-lB circuitry is operating properly.
4-2 Performance Tests
HP 8340B/41B

Table 4-2. Recommended Test Equipment (1 of 5)
Instrument Critical Specifications
Signature Multimeter
Oscilloscope
Oscilloscope Probe
Digital Voltmeter (DVM)
Power Meter
Power Sensors
Frequency Counter
Universal Counter
Spectrum Analyzers
Frequency Standard
Synthesized Sweeper (used
as Local Oscillator in ~1 and
A1,
and Sweep Generator in
Al)
Clock Frequency: =20 MHz
Dual Channel
Bandwidth: dc to 100 MHz
Vertical Sensitivity: =5 mV/Div
Horizontal Sensitivity:
50 ns/Div
10 Magnifier
External Sweep Capability
50 Ohm Vertical Input
10:1 Divider Probe
Range: —50 to +50 Vdc
Accuracy -‘-001%
Input Impedance: =10 MOhms
Power Range: 1~aW to 100 mW
Accuracy: ±0.02dB
Frequency Range: 10 to 50 MHz
Power Range: 1 jiW to 100mW
Frequency Range: 50 MHz to maximum
Frequency of DUT
Power Range: 1
1iW to 100 mW
Frequency Range: Same as DUT
Input Impedance: 50 Ohms
Frequency Accuracy:
time Base Accuracy ± 1 count
Time Interval Range: 100 ns to 200 s
Frequency Range:
HP 8340B DUT: 0.01 to 22 GHz
HP 8341 B DUT: 0.01 to 20 GHz
Must have External Time Base Input
Center Frequency Accuracy in 0 Hz Span:
Same as Time Base Accuracy
Minimum Resolution Bandwidth: :=300 Hz
Residual FM: <100 Hz
Log Fidelity: =1 dB
Must have Video Output
Frequency Range: 20 Hz to 40 MHz
Resolution Bandwidth: =3 Hz
Frequency: 10 MHz
Stability: >1 x 10 iD/yr
Frequency Range: Same as DUT
Must have External Time Base Input
Frequency Accuracy:
Same as Time Base Accuracy
RF Power Output: = +4 dBm3
Phase Noise: Must meet or exceed HP
8340B/41 B
Line Related Spurious Signals:
Must meet or exceed HP 8340B/41 B
Performance Tests
HP 5005A
HP 1741A
HP 10004D
HP 3455A or
HP 3456A
P, A, T
P, A, T
P, A, T
P, A, T
P, A, T
P, A, T
P, A, T
P. T
P, A
P, A
HP 436A
Option 022
HP 8481A
HP 8485A
HP 5343A
Option 011
HP 5316A
HP 8566A or
HP 8566B
HP 3585A
HP 5061A
HP 8340A
Opt. 001
HP 8340B/41B
4-3

Table 4-2. Recommended Test Equipment (2 of 5)
Signal Generator
Desktop Computer
Plotter/Printer ROM
Modulation Analyzer
Pulse Generator
Function Generator
Amplifier
Power Supply
Mixer
Feedthrough Termination
Attenuators
Step Attenuator
Power Splitter
HP 8654A
(or HP 8340B/41B)
HP 236
HP 226
HP 216
HP 8SF
HP Part No.
00085-10052
HP 8901A
or HP 8902A
HP 8012B
HP 3325A
HP 8447F
HP 8349B
HP 6294A
HP Part Number
0955-0307
HP 101 QOC
HP 8493C
Opt. 010
HP 8493C
Opt. 020
HP 355D
HP 11667B
Instrument Critical Specifications Recommended
Model
Use1
Frequency: 300 to 400 MHz
RF Output Power: =0 dBm
Settability: to within ±50 kHz
HP 236, 226, and 216 are equivalent to the HP
9836, 9826, and 9816 respectively. Of the three,
the HP 236 (9836) is suggested.
HP 8SF includes HP 83936A ROM Drawer, HP
82937A HP-lB Interface, and I/O ROM HP Part
No. 00085-15003.
For HP 8SF, no substitute.
No Substitute
Pulse Width: =100 nS
Rise Time: =10 ns
Frequency: 20 Hz to SO kHz
Sinewave Amplitude: =1 Vrms
Sinewave Frequency: dc to 5 MHz
Frequency Range: 100 kHz to 1.3 GHz
Gain: >20 dB
Frequency Range: 2 to 20 GHz
Gain: 15dB
0 to 50 Vdc
Voltage Drift (in 1 hour): = 0.1% ±2.5 mV
Frequency Range: 1 GHz to maximum frequency
of DUT
50 Ohm feedthrough
Frequency Range: same as DUT
Maximum Input Power: > ±20 dBm
Attenuation: 10 dB
Connectors: APC-3.5~
Frequency Range: same as DUT
Maximum Input Power: > ±20 dBm
Attenuation: 20 dB
Connectors: APC-3.5
Frequency Range: DC to 100 MHz
Maximum Input Power: =200 mW avg.
Attenuation 0 to 70 dB, settable in 10 dB steps
Frequency Range: 10 MHz to 26.5 GHz
Maximum input power: =±20 dBm
Input SWR: =1.3
Output SWR: =1.22
Output tracking: =0.25 dB
A
H P-I B
H P-I B
P
P, A, T
P, A, T
P
P
P, A
P, A
P
P, A
P, A
P
P
4.Any precision 3.5 mm adapter may be used in lieu of APC 3.5. This is true for any AP~3 3.5 equipped product mentioned in this manual.
4-4 Performance Tests
HP 8340B/41B

Table 4-2. Recommended Test Equipment (3 of 5)
Directional Coupler
Adapters
Adapter Tees
Active Probe
Probe Power Supply
High Pass Filter
(1 each required; use only if
DUT is HP 8340B)
Low Pass Filter
Crystal Detector
Diode (2 required)
Capacitors
Resistor
Frequency Range: 1 .7 to 26.5 GHz
Coupling: 16 dB
Maximum Input Power: 100mW
APC-3.5 (f) to Type N (in)
(2 required for HP 8340B/41 B)
(3 required for HP 8341B with FM)
APC-3.5 (f) to APC-3.5 (f)
(2 required for HP 8340B)
(1 required for HP 8341 B)
APC-3.5 (in) to APC-3.5 (in)
(Only used in instruments equipped with FM
- 2 required)
APC-3.5 (in) to Type N (in)
(1 required for HP 8341B LO)
SMC (f) to BNC (f)
SMA Male to BNC Female
SMA Female to SMA Female
Type N Male to BNC Female
BNC Female to Dual Banana
SMB (in) to SMB (in)
BNC Male-Female-Female
SMB Male-Male-Male
Input Impedance: 100 KOhms
Output Impedance: 50 Ohms
For HP 1121A
Frequency Range: 18.0 to 26.5 GHz
Connectors: APC-3.5 Female
APC-3.5 Male
Pass 100 MHz and below
Reject 150 MHz and above
Negative
Frequency Range: Same as DUT
Peak Inverse Voltage: 400V
Average Forward Current: 750 mA
1000 pF(±10%), 100 VDC
0.1 1iF
(±10%), 200 VDC
1 MOhm, 1%, 0.5 Watt
Instrument Critical Specifications
Recommended
Model Use1
HP Part No.
0955-0125
1250-1744
5061-5311
1250-1748
1250-1743
1250-0832
1250-1 200
1250-1159
1250-1476
1251-2277
1250-0069
1250-0781
1 250~06702
HP 1121A
HP 1122A
HP K281C
HP K281C
Opt. 012
9135-0260
HP 8473C
1901-0028
0160-4574
01 60-01 68
0757-0059
A
P, A, T
P, A, T
P, A, T
P, A
P
P, A
P
P
P
A
P
T
T, A
T, A
P
P
P
P, T
P
P
A
A
HP 8340B/41B Performance Tests 4-5

Table 4-2. Recommended Test Equipment (4 of 5)
Instrument Critical Specifications Recommended
Model
Use1
HP Part No.
PC Board Extenders 24-pin
30-pin
36-pin
44-pin
48-pin
62-pin
110-pin
08340~600952
08505~600412
08505~600422
08350~600312
08340~600502
08340~600962
08340~600332
T
T
T
T
T
T
T
IC Test Clip 16-pin
20-pin
1400~07342
1400~09792
T
T
Adjustment Tool Fits adjustment slot on components 8830~00242 T
Service Cables BNC (in) to SMB (f) (2 required)
SMA (in) to SMA (in) Semi-Rigid 61mm (~2 ft) 2
required
SMB (f) to SMB (f)
Delay Line — SMA (in) to SMA (in)
~ 1 meter (3 ft)
85680~600932
08340~201242
5061~1 0222
08503~200382
P
P, A, T
T
P
Nut Driver 9/16-inch, to replace front panel BNC nuts 08340~200992 T
Wrench 5/1 6-inch slotted box/open end 08555~200972 T
Notch Filter At least 35 dB rejection at 1 MHz Locally Fabricate P
Construct as shown below. The filter rejection
should be:
=3S dB at 1 MHz
<26 dB at 1.01 MHz
4-6 Performance Tests
HP 8340B/41B

Table 4-2. Recommended Test Equipment (5 of 5)
L3
1.0
ii C5
.027
- II
R2
51.1
J2
Reference Designator Description
HP Part
No.
Qty.
Cl ,2
C3,6
C4,7
CS
J1,2
L1,2
L3
R1,2
CAPACITOR-VAR CER 9-35PF
CAPACITOR-MICA 240PF 300V
CAPACITOR-CERAMIC 1OPF 100V
CAPACITOR-PE .027 jiF 200V
CONNECTOR RF MALE SMB
COIL lOOjiH 5%
COIL1.OjiH5%
RESISTOR 51.1 10/a .125W
0121-0046
01 40-01 99
01 60-4791
01 70-0066
1250-0257
9140-0210
9100-3551
0757-0394
2
2
2
2
2
2
2
2
1. P=Performance Tests, HP-lB~- HP-lB Operation Verification Test, A~=Adiustments, T-’~Troubleshooting.
2. These parts are included in Service Kit HP Part Number 08340-60134.
3. For best accuracy in the Pulse Modulation Rise and Fall Time and the Amplitude Modulation Performance Tests, the Local Oscillator drive to
the mixer should be = -~-4 dBm. The HP 8340A/B Option 001, used as the LO will produce +4 dBm at any frequency. Any HP 8341A/B will
provide sufficient power at all frequencies, but may be used only with an HP 8341A/B OUT.
Ri
51.1
Li
iaa
C4* C7*
lap F lOpF
L2
lao
* Nominal value
HP 8340B/41B
Performance Tests 4-7/4-8

4-1. INTERNAL TIME BASE AGING RATE
NOTE
The overall accuracy of the HP 8340B/41B 10 MHz internal time base is a
function of time base calibration ± aging rate ± temperature effects ±
line effects.
For greatest frequency accuracy, the time base should be allowed to
warm up until the output frequency has stabilized (Usually 7 to 30 days)
before calibrating (adjusting the time base frequency to a known stan -
dard). After calibration, the change in time base frequency should
remain within the aging rate if: the time base oven is not allowed to cool
down, the instrument orientation with respect to the earth’s magnetic
field is maintained, and the instrument does not sustain any mechanical
shock. Frequency changes due to orientation with respect to the earth’s
magnetic field and altitude changes will usually be nullified when the
instrument is returned to its original position. Frequency changes due to
mechanical shock will usually appear as a fixed frequency error.
If the instrument is disconnected from ac power allowing the time base
oven to cool down, it may be necessary to readjust the time base fre -
quency after a new warmup cycle; however, in most cases, the time base
frequency will return to within ± 1 Hz of the original frequency.
Specification
Table 4-3. Internal Time Base Aging Rate Specifications
Description
A reference signal from the HP 8340B/41 B under test is connected to the oscilloscope’s vertical input.
A frequency standard (with long term stability greater than 1x10’O is connected to the oscilloscope
trigger input. The time required for a specific phase change is measured immediately and after a
period of time. The aging rate is inversely proportional to the absolute value of the difference in the
measured times.
Equipment
Frequency Standard HP 5061A
Oscilloscope1
HP 1741A
Aging Rate:
lxlO—9 per day, 2.5x10 7 per year after 72-hour warm up if the instrument has been disconnected
from ac power for less than 24 hours. Aging rate is achieved after 7 to 30 days warm-up if the
instrument has been disconnected from ac power for greater than 24 hours.
Accuracy:
Overall accuracy of internal time base is a function of time base calibration ± aging rate +
temperature effects ± line effects.
1. A 50 Ohm Feedthrough Termination Isuch as the HP 101 OOC) is required when using an oscilloscope without a 50 Ohm input, It is not required
with the HP 1741A.
HP 8340B/41B Performance Tests 4-9

4-1. INTERNAL TIME BASE AGING RATE (Cont’d)
OScILLOSCOPE
a •
o 00
0
00.0
0 0* 0
00*0 0 )0®.
50fl
F EEDTHROUGH
TERM INAT ION *
tOMHz REF
OUTPUT
CH A
INPUT
1
FREQUENCY STANDARD
o o
0 0 0)0
EXT
TRIGGER
HP 8340B/41B
UNDER TEST
Q oo noon
cc noon II
H
cocA :od~ 00 cc noon II
.c 0 0000 000 00000 0
*REOUIREO ONLY FOR OSCILLOSCOPES NOT HAVING
50 OHMS INPUT CAPABILITY
Figure 4-1. Internal Time Base Aging Rate Test Setup
NOTE
Be sure the HP 8340B/41B has been connected to the AC power line for
30 days before beginning this test. If the instrument was disconnected
from the ac power line for less than 24 hours, it only has to be connected
to AC power for 24 hours before proceeding.
Procedure
1. Connect the equipment as shown in Figure 4-1.
2. Adjust the oscilloscope external triggering controls for a stable display of the HP 8340B/41B 10
MHz REF OUTPUT signal.
3. Measure the time required for a phase change of 360 degrees. Record the time (Ti) in seconds.
Ti =
second(s)
I
OUTPUT
4-10 Performance Tests
HP 8340B/41B

4-1. INTERNAL TIME BASE AGING RATE (Cont’d)
4. Wait for a period of time (from 3 to 24 hours) and remeasure the phase change time (repeat step
3). Record the period of time between measurements (T2) in hours and the new phase change
time (T3) in seconds.
T2 = hours (h)
T3 seconds (5)
S. Calculate the aging rate from the following equation:
Aging Rate = (1 cycle/f) (1/Ti — 1/T3) (T/T2)
Where: 1 cycle the phase change reference for the time measurement. (In this case, 360
degrees)
f= HP 8340B/41B Time Base output frequency (10 MHz)
T = specified time for aging rate (24 hours)
Ti = initial time measurement (5) for 360 degree (1 cycle change)
T2 = time between measurements (h)
T3 = final time measurement (5) for a 360 degree (1 cycle) change
For example, if:
Ti =351s
T2=3h
T3=349s
Then:
Aging Rate =(i cycle/b MHz) (i/351s — i/349s) (24h/3h)
=i.3O6x10~11
per day
6. Verify that the aging rate is less than 9 per day.
NOTE
If the absolute frequencies of the frequency standard and the HP
8340B/41B Time Base oscillator are extremely close, the measurement
time in steps 3 and 4 (Ti and T3) can be reduced by measuring the time
required for a phase change of less than 360 degrees. change “1 cycle”
in the equation accordingly (i.e., 180 degrees = 1/2 cycle, or 90 degrees
= 1/4 cycle).
7. If the aging rate is not within the required tolerance, be sure sufficient warmup time has been
allowed and that the environmental conditions have not changed throughout the test, then check
the Time Base heater circuit and, if necessary, replace the Time Base. Refer to service and repair
information for the ASi 10 MHz Reference Oscillator in the Reference Loop — M/N Loop portion
in Section VIII of the Service Manual.
HP 8340B/41B
Performance Tests 4-11/4-12

4-2. FREQUENCY RANGE AND CW MODE ACCURACY
Specification
Table 4-4. Frequency Range and CW Mode Accuracy Specifications
Description
The HP 8340B/41B RF output is supplied to a frequency counter. The frequency counter internal time
base is used as the reference for the DUT to eliminate time base error from the measurement. The
DUT frequency display and the counter display should agree, within the resolution of each instrument.
This procedure does not test for CW mode accuracy as a function of the time base accuracy.
NOTE
A fault in the DUT could cause the two displays to be different. Any fault
that would cause one of the phase lock loops to be unlocked would be
indicated by a front-panel UNLK indication; however, all HP 8340B/41B
internal phase lock loops could be locked and the DUT output frequency
could be in error (i.e., a phase lock loop frequency divider bit could be
bad). If all the dividers work normally, then CW mode frequency
accuracy is essentially guaranteed.
In the following procedure, the test frequencies are selected first to test the maximum frequency
range and then to exercise each frequency related circuit throughout its CW range while holding all
remaining circuits constant. The test frequencies are grouped so that an abnormal indication would
point to the circuit most likely causing the problem.
Equipment
Frequency Counter HP 5343A Option 011
Adapters
SMA (in) to BNC (f) HP P/N 1250i 200
APC 3.5 (f) to APC 3.5 (f) HP P/N S061-S3ii
(2 required if OUT is HP 8340B)
(1 required if DUT is HP 8341 B)
Type N (in) to APC 3.5 (f) HP P/N 1250-1 744
(1 required if DUT is HP 8341 B)
Cable (Semi-Rigid SMA male to SMA male) HP P/N 08340-20124
Range:
HP 8340B: 0.01 to 26.50 GHz
HP 8341B: 0.01 to 20.00 GHz
Resolution: n x 1 Hz
Where N = harmonic multiplication number. Refer to Frequency Ranges and Bandswitch Points
description in the specifications portion of Section I.
Accuracy: Same as Time Base Accuracy in the specifications portion of Section I.
HP 8340B/41B
Performance Tests 4-13

4-2. FREQUENCY RANGE AND CW MODE ACCURACY (Cont’d)
Procedure
1. Connect the equipment as shown in Figure 4-2. Connect the DUT RF Output to the 10 MHz-S00
MHz counter input. Allow the equipment to warm up for one hour. The DUT and the Frequency
Counter use the same frequency standard to eliminate time base error from the measurement.
Set the HP 8340B/41B rear panel FREQUENCY STANDARD switch to EXT.
HP 8340B/41B
UNDER TEST
I.
F111I EXT FREQUENCY
[I~ll STANDARO
1N00000000Q00uuuu11
Ill ~ I
.0 0 0000 000 00000
OUT
ADAPTER A a ADAPTER
APC 3.5 (f) TOn APC 3.5(f)
APC 3.5 Ct) TO N(m)
(834DB ONLY) • • (83415 ONLY)
I
FREQUENCY
COUNTER
FREG STO —
OUT
000000 0:
o 0000
a
10Hz— •500MHz—
500MHz • 276Hz
U
C.
ADAPTER A
SMA (n)
TO BNC Ct)
j Y
ADAPTER
APO 3.5 Ct) TO
APC 3.5(1)
SEMI—RIGID CABLE
Figure 4-2. Frequency Range Test Setup
2. Press HP 8340B/41B [INSTR PRESET], then [CW] and enter [1] [0] [MHz]. Press (POWER
LEVEL] and enter [+1[1][0] [dBmJ.the counter should indicate 10 MHz ± 1 Hz ± the resolution
of the counter.
3. Check the high frequency endpoint.
FOR HP 8340B
Connect the HP 8340B RF output to the 500 MHz-26.5 GHz counter input. Press the HP 8340B
[CW] key and enter [2] [6] [.1[5] [GHz]. Press [POWER LEVEL] [0] [dBm]. The counter should
indicate 26.5 GHz ±4 Hz ± the resolution of the counter.
FOR HP 8341B
Connect the HP 8341B RF output to the 500 MHz-26.5 GHz counter input. Press the HP 8341B
[CW] key and enter [2] [0] 1GHz]. Press [POWER LEVEL] [0] [dBm]. The counter should indicate
20.0 GHz ±3 Hz ± the resolution of the counter.
NOTE
Since the same time base is used for both the HP 8340B/41B and the
frequency counter, only the displayed frequency is checked. The actual
frequency error is ± (DUT output frequency/b MHz) X time base error ±
4 Hz (HP 8340B) or 3 Hz (HP 8341B).
4. Check the M/N M Divider frequencies as follows:
4-14 Performance Tests HP 8340B/41B

4-2. FREQUENCY RANGE AND CW MODE ACCURACY (Cont’d)
NOTE
Pressing [SHIFT][Ml] displays, from left to right, the:
M divide number,
N divide number,
M/N Loop output frequency,
20/30 Loop output frequency.
Press [SHIFT][M5] to exit this diagnostic mode. The instrument con -
tinues to operate normally while in the diagnostic mode.
a. Press [CW] key and enter [2] [4] [9] [01[MHz]. Select a step size of 10 MHz by pressing
[SHIFT][CF][1] [0] [MHz]. Press [SHIFT][Ml] to display, from left to right, the M divide
number, the N divide number, the M/N Loop output frequency, and the 20/30 Loop output
frequency. Press the [CW] key to display the CW frequency in the [ENTRY DISPLAY].
b. Using the down arrow key, step down to 2 300.000000 MHz. Check the counter indication at
each step. The counter should indicate the HP 8340B/41 B frequency ± 1 Hz z the resolution
of the counter at each step.
NOTE
The above step sets and holds the N Divider to 13 and programs the M
Divider through its full range of 8 to 27. Any frequency error as a result of
a problem in the M Divider will probably be a multiple of 10 MHz.
c. If a significant frequency error is evident, note the conditions under which the error occurred
and continue this procedure to determine if any other conditions produce an error.
5. Check the M/N N Divider frequencies as follows:
a. Select a step size of 200 MHz by pressing [SHIFT][CF] [2] [0] [0] [MHz]. Press [CW] to
display the CW frequency in the [ENTRY DISPLAY]. The CW frequency should be 2
300.000000 MHz.
b. Using the up arrow key, step to 6900.000000 MHz. Check the counter indication at each step.
The counter should indicate the HP 8340B/41B frequency ± 1 Hz ± the resolution of the
counter.
NOTE
The above step sets and holds the M Divider to 27 and programs the N
Divider through its full range of 13 to 36. Any frequency error as a result
of a problem in the M Divider will probably be a multiple of 10 MHz.
c. If a significant frequency error is evident, note the conditions under which the error occurred
and continue this procedure to determine if any other conditions produce an error.
6. Check the 20/30 MHz N2 loop frequencies as follows:
a. Press [INSTR PRESET]. Press[CF] key and enter [2][3][1][0][.] [5] [MHz]. Press the [AF]
key and enter [1][MHz]. Select a step size of 1 kHz by pressing [SHIFT][CF][1][kHz].
b. Press [SINGLE] sweep key to set the DUT to be phase-locked at the start of sweep (2.310
GHz]. Press [SHIFT][Ml] to enter the diagnostic display mode. Press [CF] to display the
center frequency in the [ENTRY DISPLAY]. The center frequency should be 2.310S00 GHz.
HP 8340B/41B
Performance Tests 4-15

4-2. FREQUENCY RANGE AND CW MODE ACCURACY (Cont’d)
c. Using the up arrow key, step the center frequency up to 2.310510 GHz. Check the counter
indication at each step. The counter should indicate the DUT start frequency (CF — 0.0005
GHz) ± 1 Hz ± the resolution of the counter.
NOTE
The above steps set the output of the M/N loop to 180 MHz where M = 26
and N = 13. The YO start frequency (2310 MHz) is then 20 to 30 MHz below
the Nth harmonic (N =13) of 180 MHz (180 x 13 = 2340). The 20/30 MHz
output is then 30 MHz. since the AF frequency (1 MHz) is between 0.1 to 5
MHz, the 20/30 MHz frequency is derived from the PLL2 75 to 150 MHz
VCO output divided by 5 (150 MHz / 5 = 30 MHz). The PLL2 VCO fre -
quency is stepped down in 5 kHz steps which steps the 20/30 frequency
from 30 MHz down to 29.990 MHz in 1 kHz steps. Since the M/N fre -
quency remains constant and the HP 8340B/41B output frequency is
mixed with a harmonic (13th) of the M/N signal and the resultant output is
phase compared to the 20/30 output, the DUT output frequency must
increase by 1 kHz/step to satisfy the 20/30 phase lock loop. This checks
the least significant (BCD) N2 programming bits.
To observe the N2 PLL2 VCO frequency changes, repeat the N2 loop
frequency check (Step 6a through 6c) pressing [SHIFT][M3] in step 6b
rather than [SHIFT][Ml]. [SHIFT][M3] will display, from left to right, the
PLL2 VCO frequency and the PLL3 Up Converter frequency (the PLL3 UP
Converter frequency display will be 0 since the PLL3 is not used in the
swept mode).
d. Select a step size of 10 kHz by pressing [SHIFT][CF][1][0] [kHz].Press [CF]to display the
center frequency in the [ENTRY DISPLAY]; the display should indicate 2.310S10 GHz.
e. Using the up arrow key, step the center frequency up to 2.31 0600 GHz. Check the counter
indication at each step. The counter should indicate the DUT start frequency (CF — 0.0005
GHz) ± 1 Hz ± the resolution of the counter.
NOTE
The above steps program the 20/30 frequency from 29.99 MHz to 29.90
MHz in 0.01 MHz steps and checks additional N2 Divider programming
bits.
f. Select a step size of 100 kHz by pressing [SHIFT] [CF] [1] [0] [0] [kHz]. Press [CF] to display
the center frequency in the [ENTRY DISPLAY]. The CF should be at 2.31 0600 GHz.
g. Using the up arrow key, step the center frequency up to 2.311S00 GHz. Check the counter
indication at each step. The counter should indicate the DUT start frequency (CF — QOQOS
GHz) ± 1 Hz ± the resolution of the counter.
NOTE
The above steps program the 20/30 frequency from 29.9 to 29.0 in 0.1
MHz steps and check additional N2 Divider programming bits.
h. Select a step size of 1 MHz (press [SHIFT][CF] and enter [1][MHz]).Press [CF] to display the
center frequency in the [ENTRY DISPLAY]. The CF should be at 2.311S00 GHz.
4-16 Performance Tests
HP 8340B/41B

4-2. FREQUENCY RANGE AND CW MODE ACCURACY (Cont’d)
i.Using the up arrow key, step the center frequency up to 2.320500 GHz. Check the counter
indication at each step. The counter should indicate the DUT start frequency (CF — 0.0005
GHz) ± 1 Hz ± the resolution of the counter.
NOTE
The above steps program the 20/30 frequency from 29.0 MHz to 21.0 MHz
in 1 MHz steps. The last CF step programs the 20/30 to 30 MHz and the
M/N frequency to 180.769231 MHz. This checks the remaining N2 Divider
programming bits.
j. If a significant frequency error is evident, note the conditions under which the error occurred
and continue this procedure to determine if any other conditions produce an error.
7. Check the 20/30 MHz Ni loop frequencies as follows:
a. Press [INSTR PRESET]. Select a step size of 10 kHz by pressing [SHIFT][CF][1][0][kHz].
Press [CW] and enter [2][3][1][9][.][9][7][MHz].
b. Press [SHIFT][Ml] to display, from left to right, the M divide number, the N divide number, the
M/N Output frequency, and the 20/30 Output frequency.
c. Using the down arrow key, step the CW frequency down to 2 319.870000 MHz. Check the
counter indication at each step. The counter should indicate the DUT CW frequency ± 1 Hz ±
the resolution of the counter.
NOTE
The above steps set the output of the M/N loop to 180 MHz where M=26
and N =13. The PLL1 VCO frequency is stepped up in 100 kHz steps. This
steps the 20/30 frequency up from 20.03 MHz in 10 kHz steps to 20.13
MHz. The M/N frequency remains constant and the YO frequency is
mixed with a harmonic (13th) of the M/N signal. The resultant output is
phase compared to the 20/30 output. The DUT output frequency must
decrease by 10 kHz/step to satisfy the YO phase lock loop. This checks
the least significant Ni programming bits.
d. Select a step size of 100 kHz by pressing [SHIFT][CF][1][0][0][kHz]. Press the [CW] key to
view the CW frequency in the [ENTRY DISPLAY]. The CW frequency should be at 2
319.870000 MHz.
e. Using the down arrow key, step the CW frequency down to 2 318.970000 MHz. Check the
counter indication at each step. The counter should indicate the DUT CW frequency ± 1 Hz ±
the resolution of the counter.
NOTE
The above steps program the 20/30 frequency from 20.13 up to 21.03 in
0.1 MHz steps and checks additional Ni Divider programming bits.
HP 8340B/41B Performance Tests 4-17

4-2. FREQUENCY RANGE AND CW MODE ACCURACY (Cont’d)
f. Select a step size of 1 MHz by pressing [SHIFT][CF] [1] [MHz]. Press the [CW] key to view
the CW frequency in the [ENTRY DISPLAY]. The CW frequency should be at 2318.97000
MHz.
g. Using the down arrow key, step the CW frequency down to 2310.970000 MHz. Check the
counter indication at each step. The counter should indicate the DUT CW frequency ± 1 Hz +
the resolution of the counter.
NOTE
The above steps program the 20/30 frequency from 21.03 MHz to 29.03
MHz in 1 MHz steps and check the remaining Ni Divider programming
bits.
8. If frequency errors occurred, the instrument requires service. To troubleshoot the instrument,
determine what frequency related circuit is most likely to have caused the symptom (i.e., M/N
Loop or 20/30 Loop) then refer to Section VIII of the Service Manual (may be ordered separately).
4-18 Performance Tests
lIP 8340B/41B