HP 8572A User Manual Download | Manualshive

Page: 119 / 146

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5.

Set

the

EMI

receiv

er

as

follows:

4

ST

ART

FREQ

5

:

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15

MHz

4

STOP

FREQ

5

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16

MHz

4

RES

BW

5

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100

kHz

4

VIDEO

BW

5

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100

kHz

4

SWEEP

TIME

5

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100

ms

QP

A

BW

:

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9

kHz

QP

A

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NORMAL

6.

Because

the

signal

of

in

terest

is

in

the

0.15

to

30

MHz

region,

the

9

kHz

quasi-p eak

bandwidth

(QP

A

BW)

is

selected.

Refer

to

the

table

on

the

fron

t

of

the

quasi-p eak

adapter,

and

set

the

sp ectrum

analyzer

resolution

and

video

bandwidths

to

100

kHz.

7.

According

to

the

table,

sw

eep

time

with

the

quasi-p eak

detector

in

NORMAL

(or

o

)

is

100

ms/MHz.

Because

the

selected

span

is

1

MHz,

the

sw

eep

time

for

this

measuremen

t

m

ust

b e

at

least

100

ms.

8.

T

o

read

amplitude

in

dBV,

press

4

SHIFT

5

C

on

the

sp ectrum

analyzer.

9.

Adjust

the

reference

lev

el

to

bring

the

signal

near

the

top

of

the

display

.

10.

Disconnect

the

signal

source.

Connect

the

preselector

com

b

generator

output

to

the

receiv

er

input

used

in

the

measuremen

t.

Note

Before

calibrating

the

system:

Make

sure

all

equipmen

t

settings

are

correct.

Do

not

c

hange

the

resolution

bandwidth,

scale,

attenuation,

or

input

p ort

after

calibration.

(The

start

and

stop

frequencies

may

b e

c

hanged

after

calibration

if

the

frequency

range

stays

within

the

range

at

whic

h

the

receiv

er

w

as

calibrated.)

Manually

set

critical

system

parameters

man

ually

,

suc

h

as

resolution

bandwidth.

P

arameters

that

are

set

man

ually

will

not

c

hange

during

the

calibration

routine;

parameters

that

are

still

in

the

auto-coupled

mo

de

may

c

hange

during

the

calibration

routine.

11.

Press

CAL

SEQ

4

ST

ART

5

on

the

preselector.

Selected

com

b

teeth

are

measured

b

y

the

sp ectrum

analyzer

section.

An

y

v

ariation

b et

w

een

the

measured

com

b

to

oth

amplitude

and

the

v

alue

stored

in

the

preselector

section

is

corrected

b

y

an

in

ternal

preselector

section

gain

adjustmen

t.

The

CAL

SEQ

LED

ashes

while

the

calibration

routine

runs.

Note

After

calibration,

the

CAL

SEQ

LED

stays

on,

indicating

that

the

system

is

calibrated

o

v

er

the

curren

t

frequency

range.

If

the

frequency

range

is

increased

b ey

ond

the

calibrated

frequency

range,

the

light

turns

o

to

indicate

an

uncalibrated

state.

Ho

w

ev

er,

the

CAL

SEQ

light

do es

not

turn

o

when

parameters

other

than

the

HP

8572A

EMI

Receiv

er

User's

Guide

Making

Typical

Measurements

4-13

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Summary of Contents for 8572A

Page 1: ...User s Guide HP 8572A EMI Receiver ABCDE HP Part No 08572 90003 Printed in USA April 1992 ...

Page 2: ...f this material Restricted Rights Legend Use duplication or disclosure by the U S Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 for DOD agencies and subparagraphs c 1 and c 2 of the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 for other agencies c Copyright Hewle...

Page 3: ...er Buyer shall pay all shipping charges duties and taxes for products returned to Hewlett Packard from another country Hewlett Packard warrants that its software and rmware designated by Hewlett Packard for use with an instrument will execute its programming instructions when properly installed on that instrument Hewlett Packard does not warrant that the operation of the instrument or software or ...

Page 4: ...istance Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service O ce iv ...

Page 5: ...N sign until the indicated conditions are fully understood and met WARNING The WARNING sign denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury to the user Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met DANGER The DANGER sign denotes an imminent hazard to people It warns the reade...

Page 6: ...he protective conductor inside or outside of the instrument is likely to make the instrument dangerous Intentional interruption is prohibited For continued protection against fire hazard replace fuse only with same type and ratings type nA nV The use of other fuses or materials is prohibited WARNING Before this instrument is switched on make sure it has been properly grounded through the protectiv...

Page 7: ...er system Chapter 2 How to perform operation veri cation Chapter 3 How to set up your test equipment for operation veri cation Chapter 4 How to make typical measurements with your EMI receiver system Chapter 5 How to make measurements with downloadable programs vii ...

Page 8: ......

Page 9: ...ep 5 Choose the output destination for your test results 2 7 Step 6 Select Test all model numbers 2 8 Step 7 Select equipment from the UUT Con guration menu 2 9 Step 8 Assign serial numbers to all equipment 2 10 Step 9 Verify the test equipment 2 11 Step 10 Con rm the list of accessories 2 12 Step 11 Run the operation veri cation tests 2 13 Optional Installing the software on an SRM or HFS hard di...

Page 10: ...tude Accy INPUT 2 10 dB AT and 0 dB AT 3 36 Disp Average Noise INPUT 2 3 39 Residual Responses INPUT 2 3 41 Amplitude Accy INPUT 3 3 43 Disp Average Noise INPUT 3 10 Hz RBW 3 48 Residual Responses INPUT 3 3 50 4 Making Typical Measurements Testing for Overload 4 1 3 dB Linearity Check 4 2 Narrowband Broadband Signals 4 2 Commercial Compliance Measurements 4 5 Detector Selection 4 5 Measurement Exa...

Page 11: ...11 Quasi Peak Measurement of a CW Signal 4 18 4 12 Quasi Peak Measurement of a Broadband Signal 4 20 4 13 Composite Signal 4 21 4 14 Average Measurement 4 23 4 15 CE03 Power Lead Test Setup Air Force and Navy 4 24 4 16 Current Probes as Transducers 4 25 4 17 Bandwidth Correction Factor 4 26 4 18 RE02 Test Setup 4 27 4 19 Characteristic Appearance of Radiated Emissions 4 30 4 20 Equipment Under Tes...

Page 12: ......

Page 13: ...ibrate your receiver how to calibrate receiver INPUT 1 and receiver INPUT 2 how to calibrate receiver INPUT 3 how to perform preselector peaking for receiver INPUT 3 how use a calibration table to calibrate receiver INPUT 3 how to perform manual and automated measurements HP 8572A EMI Receiver User s Guide Calibrating Your Receiver 1 1 ...

Page 14: ...ttenuation logarithmic linear scale AMPTD CAL setting In addition to these calibrations you also should verify the performance of the HP 8572A microwave EMI receiver periodically Complete RF preselector comb characterization and all EMI receiver system performance tests every six months to be sure the EMI receiver system continues to meet its speci cations During performance testing use the entire...

Page 15: ...light 5 Press 4RECALL5 485 on the spectrum analyzer 6 Adjust AMPTD CAL on the spectrum analyzer for 010 dBm 60 20 dB 7 Press 4RECALL5 495 on the spectrum analyzer 8 Adjust FREQ ZERO on the spectrum analyzer for a maximum signal on the display 9 Select the frequency range resolution bandwidth logarithmic linear scale and attenuator settings to be used for the desired measurement 10 Select the quasi...

Page 16: ...requency is increased beyond the calibrated frequency range the CAL SEQ LED turns o to indicate an uncalibrated state Note The CAL SEQ LED does not turn o when settings other than start or stop frequency are changed Therefore it is possible for an uncalibrated state to exist for the current settings of resolution bandwidth attenuation or amplitude scale while the CAL SEQ LED is turned on Be sure t...

Page 17: ... the LED in that key will light 4 Press 4RECALL5 485 on the spectrum analyzer 5 Select the resolution bandwidth and logarithmic linear scale settings for the measurement 6 Adjust AMPTD CAL on the spectrum analyzer for 010 dBm 60 20 dB 7 Press 4RECALL5 495 on the spectrum analyzer 8 Adjust FREQ ZERO on the spectrum analyzer for maximum trace amplitude 9 Press the SWITCHES 0 4 5 key on the attenuato...

Page 18: ...nge resolution bandwidth or logarithmic linear scale settings or readjust AMPTD CAL on the spectrum analyzer repeat this procedure with the new settings 1 6 Calibrating Your Receiver HP 8572A EMI Receiver User s Guide ...

Page 19: ...attenuated by the lter skirts Use the factory default preselector DAC setting of 32 obtained by executing 4SHIFT5 4PRESEL PEAK5 for best overall frequency response when viewing an entire swept frequency band Because the relative tuning of the preselector lter changes at di erent points in any given frequency span the optimum preselector peak DAC value can di er by several DAC numbers for di erent ...

Page 20: ...igure 1 1 is a sample calibration table The calibration data corrects for preampli er gain preampli er frequency response and spectrum analyzer frequency response for both 0 dB and 10 dB spectrum analyzer attenuation after the receiver calibration routine has been completed Calibration factors are provided every 50 MHz from 1 0 GHz to 22 GHz for each frequency band Calibration data is provided in ...

Page 21: ...Frequency Band 0 Correction Correction Factor Factor With 29 2 dB With 29 2 dB Reference Reference Frequency Gain Level Offset Frequency Gain Level Offset GHz dB dB GHz dB dB 1 00 36 1 6 9 1 80 35 6 6 5 1 05 36 0 6 8 1 85 35 6 6 4 1 10 36 1 6 9 1 90 35 5 6 3 1 15 36 0 6 8 1 95 35 5 6 3 1 20 35 8 6 6 2 00 35 5 6 3 1 25 36 1 6 9 2 05 35 3 6 1 1 30 35 9 6 7 2 10 35 3 6 1 1 35 36 0 6 8 2 15 35 4 6 2 F...

Page 22: ...ovided in both bands for the overlapping frequency points Be sure to use the correction factor for the selected frequency band used in the measurement Refer to Table 1 2 To determine the frequency band press 4SHIFT5 4CONT5 The harmonic lock number corresponding to the frequency band will be displayed Press 4SHIFT5 4MKR 1 STP SIZE5 to return the spectrum analyzer to normal operation 1 10 Calibratin...

Page 23: ...or frequencies not given in the table interpolate between table values Because the actual amplitude of all signals always will be lower than the displayed amplitude the correction factor acts as an additional guard band If any signals are above or near the test limit subtract the calibration factor from the displayed signal level to determine the correct signal amplitude If you use the reference l...

Page 24: ...able provided as ASCII data in CITI le data format It can be used by the HP 85869A EMI Measurement Software with Revision A 03 00 or later A Software Toolbox disk containing utilities example programs documentation and sample data les for CITI le format is available order HP part number 85103 10002 Be sure to use the correction factor for the appropriate spectrum analyzer attenuation setting data ...

Page 25: ...Figure 1 2 Calibration Data Graph HP 8572A EMI Receiver User s Guide Calibrating Your Receiver 1 13 ...

Page 26: ...ed mode is on CORR D appears on the lower left side of the display To turn o corrected mode press 4SHIFT5 4STOP FREQ5 The calibration procedures in this chapter ensure the speci ed amplitude accuracy There is no additional bene t from using the spectrum analyzer corrected mode 1 14 Calibrating Your Receiver HP 8572A EMI Receiver User s Guide ...

Page 27: ...test equipment If you use other models of test equipment you may need to modify the operation veri cation program For your convenience calibration and performance veri cation are available through your local Hewlett Packard service center It takes about four hours to complete all the operation veri cation tests for the HP 8572A microwave EMI receiver Because the program supports several input devi...

Page 28: ...olume 1 If the computer does not have an HP 98624A HP IB interface a Connect the EMI receiver system to the connector marked HP IB SELECT CODE 7 2 Connect the HP IB cables from the test equipment to the HP IB SELECT CODE 7 connector on the computer 3 Connect the HP IB of the external disk drive to the computer connector labeled HP IB SELECT CODE 7 using a 0 5 meter HP IB cable HP 10833D BNC 0 5 me...

Page 29: ...ical le system environment yOptional required only for SRM shared resource management environment zOptional required only for Debug Caution Before starting the tests make backup copies of the operation veri cation software disks store the backup disks in a safe place If an original disk is damaged or if program data is altered or lost you will have this backup set Operation veri cation software is...

Page 30: ...e as the default drive For example MSI 700 0 Insert disk 1 into the disk drive Type LOAD OPV 1 and press 4ENTER5 When prompted remove disk 1 from the disk drive and insert disk 2 Press 4CONTINUE5 2 4 Operation Verification HP 8572A EMI Receiver User s Guide ...

Page 31: ... system is an Option 049 you will enter this information when you perform Step 4 Enter the EMI receiver system test information d a c b SPECIFIC MODEL HP8571A NNNNNNNNNNNNNNNNNNNNNNN HP8572A 1 Use 4 5 and 4 5 to highlight NNNNNNNNNNNNNNNNNNNNNNNNNN HP 8572A 2 Press 4ENTER5 to select the UUT The computer will display a title page for the EMI receiver system operation veri cation test 3 To continue ...

Page 32: ...ER5 3 If other items in this list need to be changed refer to these sections at the end of this chapter for instructions Optional Assigning the address type Optional Selecting the EMI receiver system address Optional Adding option 049 Optional Modifying the temperature setting Optional Modifying the humidity setting Optional Selecting the line frequency Note You do not need to change the NNNNNNNNN...

Page 33: ...not displayed You must choose where you want to direct these reports d a c b Where should test reports be directed NNNNNNNNNNN CRT PRINTER NO OUTPUT 1 Use 4 5 and 4 5 to select if you want the test reports displayed on the computer display CRT printed on the printer or not output at all 2 Press 4ENTER5 HP 8572A EMI Receiver User s Guide Operation Verification 2 7 ...

Page 34: ...ion NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Test all model numbers Test only the mainframe base unit 1 Select NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN Test all model numbers Test only the mainframe base unit does not apply to the EMI receiver system 2 Press 4ENTER5 2 8 Operation Verification HP 8572A EMI Receiver User s Guide ...

Page 35: ...lection menu you will see a display similar to this d a c b UUT Configuration NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN BASE UNIT HP8572A UUT RF HP85660B UUT IF HP85662A UUT SW HP11713A UUT AMP HP8449B H02 1 Use 4 5 and 4 5 to select a piece of equipment from the UUT Con guration menu 2 Press 4ENTER5 HP 8572A EMI Receiver User s Guide Operation Verification 2 9 ...

Page 36: ... Use 4 5 and 4 5 to select NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN SERIAL NUMBER 2 Press 4ENTER5 3 Enter the serial number of the instrument you selected in Step 7 Select equipment from the UUT Con guration menu 4 Press 4ENTER5 5 If you need to change other receiver con guration on this list use 4 5 and 4 5 to select the item to be changed refer to these sections at the end of this chapter for i...

Page 37: ...numbers and addresses do not match your test equipment you must change your test equipment and addresses or you must edit the display to the alternate equipment you are using To change your test equipment and its addresses to match the displayed test equipment and addresses Make the equipment changes to match the displayed models Select NNNNNNNNNNNNNNNNNNNNNNNNNN CONTINUE on the display Press 4ENT...

Page 38: ... BNC m to BNC m HP 10503A 3 required Flexible coax calibration cable type N m to N m HP 8120 4781 Adapter type N m to BNC f HP 1250 1535 91 cm flexible coax cable type N m to N m HP 8120 5140 NNNNNNNNNNNNNNNNNNNNNNNNNN CONTINUE PRINT Select NNNNNNNNNNNNNNNNN PRINT if you want a copy of this accessory list Select NNNNNNNNNNNNNNNNNNNNNNNNNN CONTINUE to go on to the next step of the setup procedure 2...

Page 39: ...de Accy Input 3 Disp Average Noise Input 3 10 Hz RBW Residual Responses Input 3 HP 8572A microwave EMI receiver tests The display shows the operation veri cation tests The screen may not show all the tests use 4 5 and 4 5 to view the entire list These operation veri cation tests are organized in a speci c sequence designed to minimize changes in equipment setups 1 Use 4 5 and 4 5 to select the rst...

Page 40: ...d a c b Quit the Test Executive Program NNNNNNNNNNN YES NO 6 Use the arrow keys to select YES or NO 7 Press 4ENTER5 2 14 Operation Verification HP 8572A EMI Receiver User s Guide ...

Page 41: ...system For information about creating directories and copying les refer to the appropriate SRM or HFS hard disk manual To install the test software 1 Create a directory to contain the operation veri cation program and its associated les 2 Copy all operation veri cation program les from the two 3 5 inch disks to this directory HP 8572A EMI Receiver User s Guide Operation Verification 2 15 ...

Page 42: ...ADDRESS TYPE HP IB NNNNNNNNNNNNNNNNN HP IB NONE OTHER TEMPERATURE 23 0 DEG C HUMIDITY 50 0 LINE FREQUENCY 60 Hz 2 Use 4 5 and 4 5 to select the address type 3 Press 4ENTER5 4 Verify that the EMI receiver system address is correct If the address information needs to be updated refer to the following section Optional Selecting the EMI receiver system address When NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN...

Page 43: ...DDRESS 718 CONTROLLER OPTIONS TEMPERATURE 23 0 DEG C HUMIDITY 50 0 LINE FREQUENCY 60 Hz 1 Select NNNNNNNNNNNNNNNNNNNNNNN ADDRESS then press 4ENTER5 The default address for the EMI receiver system is 718 2 Use the arrow keys to change the display to the correct address Use 4 5 and 4 5 to move the cursor to the appropriate address digit Use 4 5 and 4 5 to change the number to the correct digit 3 Pre...

Page 44: ... IB ADDRESS 718 CONTROLLER NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN OPTIONS UUT OPTIONS NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN 049 NO Deletes the HP 8449B in HP 8571A HP 8572A systems LINE FREQUENCY 60 Hz 2 Press 4ENTER5 to change NNNNNNNN NO to NNNNNNNNNN...

Page 45: ...NNNNNNNNNNNNNN TEMPERATURE 23 0 DEG C HUMIDITY 50 0 LINE FREQUENCY 60 Hz 1 Press 4ENTER5 The default temperature is 23 0 degrees celsius Enter temperatures in celsius only 2 Use the arrow keys to change to the correct temperature Use 4 5 and 4 5 to move the cursor to the digit to be changed Use 4 5 and 4 5 to change to the correct temperature 3 Press 4ENTER5 4 Return to step 3 of Step 4 Enter the ...

Page 46: ...NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN HUMIDITY 50 0 LINE FREQUENCY 60 Hz 1 Select NNNNNNNNNNNNNNNNNNNNNNNNNN HUMIDITY then press 4ENTER5 The default humidity is 50 percent 2 Use the arrow keys to change to the correct humidity Use 4 5 and 4 5 to move the cursor to the column to be changed Use 4 5 and 4 5 to change the digit to the correct number 3 Press 4ENTER5 4 Return to step 3 of Step 4 Enter the E...

Page 47: ...NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN LINE FREQUENCY then press 4ENTER5 d a c b UUT HP8572A SERIAL NUMBER 0000A00000 ADDRESS TYPE HP IB ADDRESS 718 CONTROLLER OPTIONS TEMPERATURE 23 0 DEG C HUMIDITY 50 0 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN LINE FREQUENCY 60 Hz NNNNNNNNNNNNNNNNN 60 Hz 50 Hz 400 Hz 2 Use the arrow keys to select the line frequency that the EMI receiver system is using The de...

Page 48: ...on the display 4 Press 4ENTER5 to display the operation veri cation test menu 5 Press 4CONTINUE5 You will be asked if you want to quit the Test Executive Program 6 The default selection is YES Press 4ENTER5 to exit the operation veri cation test software Load the default test equipment TSCRIPT le 7 Insert operation veri cation disk 1 in the default disk drive 8 Type GET TSCRIPT and press 4RETURN5 ...

Page 49: ...sized sweeper HP 83640A synthesized sweeper1 716 Synthesized sweeper HP 83650A synthesized sweeper1 716 Synthesized sweeper HP 8340A synthesized sweeper 716 Synthesized sweeper HP 8340B synthesized sweeper 716 Synthesizer Level generator HP 3335A synthesizer level generator 704 Universal counter HP 5316A universal counter2 720 Universal counter HP 5316B universal counter2 720 This is the factory s...

Page 50: ...ould be FG1 HP8116A Then scroll to the S_PULSE1 Power Meter PM1 line Under this line nd Universal Counter FC1 and note the asterisk comment character Delete the asterisk in the Universal Counter FC1 line 12 Scroll to the DEFAULT_ADDRESSES section of the le and edit the equipment addresses as you did in step 2 of this procedure Valid addresses are 00 to 30 Valid select codes are 0 through 5 and 7 t...

Page 51: ...ETED appears on the computer screen the operation veri cation software is ready to load and run 16 Continue at the beginning of the operation veri cation software Refer to Step 3 Select the EMI receiver system model HP 8572A EMI Receiver User s Guide Operation Verification 2 25 ...

Page 52: ...FILE and press 4Select5 or the equivalent key d a c b HP8485D ID XXXX CAL FACTOR NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN EDIT REFERENCE CAL FACTOR 100 00 EDIT CAL FACTORS EDIT FREQUENCY LIST 2 Highlight EDIT REFERENCE CAL FACTOR 100 00 and press 4Select5 or the equivalent key 3 Enter the REF CAL FACTOR printed on your power sensor Use 4 ...

Page 53: ...TE or EDIT then press 4Select5 14 Use the 4 5 and 4 5 to position the cursor under the appropriate eld Then use 4 5 and 4 5 to change the frequency 15 Press 4Home5 to exit the FREQUENCY LIST display Note Frequencies are sorted in ascending order when you exit the FREQUENCY LIST display Choose YES if you want to edit the calibration factors If you want to store the modi ed calibration factor le ins...

Page 54: ......

Page 55: ... this chapter you ll nd equipment setup diagrams parts lists and test descriptions for each operation veri cation test available for an HP 8572A microwave EMI receiver HP 8572A EMI Receiver User s Guide Test Descriptions 3 1 ...

Page 56: ...Calibrator Amplitude Accuracy Recommended Equipment power meter HP 436A power meter power sensor HP 8482A N m power sensor 3 2 Test Descriptions HP 8572A EMI Receiver User s Guide ...

Page 57: ...Recommended Equipment power meter HP 436A power meter power sensor HP 8482A N m power sensor adapter HP 1250 0077 N f to BNC m HP 8572A EMI Receiver User s Guide Test Descriptions 3 3 ...

Page 58: ...he power meter is calibrated Then the power sensor is connected to the 100 MHz calibrator output The calibrator amplitude is measured and corrected using the calibration factor of the power sensor Note Optional Entering power sensor calibration factors in chapter 2 discusses requirements for entering calibration factors for the power sensor being used 3 4 Test Descriptions HP 8572A EMI Receiver Us...

Page 59: ... Fidelity Recommended Equipment synthesizer level generator HP 3335A synthesizer level generator cable HP 10503A 122 cm 48 in 50 coax BNC m to BNC m HP 8572A EMI Receiver User s Guide Test Descriptions 3 5 ...

Page 60: ...er amplitudes establishes a reference error at this point The level generator is stepped down in 2 dB increments until the signal is 70 dB below top screen or 10 dB above the displayed average noise whichever is higher The amplitude di erence between the level generator and the displayed trace average is measured at each level generator step The di erence between the amplitude error at each level ...

Page 61: ...r Fidelity Recommended Equipment synthesizer level generator HP 3335A synthesizer level generator cable HP 10503A 122 cm 48 in 50 coax BNC m to BNC m HP 8572A EMI Receiver User s Guide Test Descriptions 3 7 ...

Page 62: ...erator and marker amplitudes establishes a reference error at this point The level generator is stepped down in 10 of full scale increments until the signal is nine divisions below the top of the screen The amplitude di erence between the level generator and the displayed trace average is measured at each level generator step The di erence between the amplitude error at each level generator step a...

Page 63: ...Switching Uncertainty Recommended Equipment synthesizer level generator HP 3335A synthesizer level generator cable HP 10503A 122 cm 48 in 50 coax BNC m to BNC m HP 8572A EMI Receiver User s Guide Test Descriptions 3 9 ...

Page 64: ...nce level The di erence between the level generator and marker amplitudes establishes a reference error at this point The level generator and EMI receiver system reference level are stepped down in 4 dB increments until the signal is 057 dBm or 10 dB above the displayed average noise which ever is higher The amplitude di erence between the level generator and the displayed trace average is measure...

Page 65: ...the following limits Reference Level Switching Uncertainty Test Limits EMI receiver system Reference Level dBm Reference Level Switching Uncertainty dB 13 dBm Reference 043 dBm to 13 dBm 60 50 dB 055 dBm to 043 dBm 60 80 dB HP 8572A EMI Receiver User s Guide Test Descriptions 3 11 ...

Page 66: ...Receiver Calibration INPUT 1 Recommended Equipment cable HP 8120 4781 61 cm 24 in 50 coax N m to N m adapter HP 1250 0077 N f to BNC m 3 12 Test Descriptions HP 8572A EMI Receiver User s Guide ...

Page 67: ...INPUT 1 is calibrated between 9 kHz and 50 MHz To make calibrated measurements with the EMI receiver system CAL SEQ must be run for each set of EMI receiver system settings This test runs CAL SEQ at the settings that will be used in subsequent tests The resulting calibration factors are stored in the controller memory and loaded into the RF preselector when they are needed Test Settings Settings f...

Page 68: ... 200 kHz to 50 MHz QPA Filter BYPASS BYPASS RES BW 10 kHz 10 kHz RFPS atten 0 dB 0 dB SA atten 0 dB 0 dB Scale Log 10 dB Log 10 dB Settings for Sensitivity INPUT 1 20 Hz to 9 kHz Function Settings Manual RF FREQ 20 Hz to 9 kHz QPA Filter BYPASS RES BW 10 kHz RFPS atten 0 dB SA atten 0 dB Scale Log 10 dB Settings for Residual Responses INPUT 1 Function Settings Manual Settings Auto RF FREQ 9 kHz to...

Page 69: ... dB AT and 0 dB AT 20 Hz 9 kHz Recommended Equipment synthesizer level generator HP 3335A synthesizer level generator cable HP 10503A 122 cm 48 in 50 coax BNC m to BNC m HP 8572A EMI Receiver User s Guide Test Descriptions 3 15 ...

Page 70: ... Di erences in the amplitude measured by the EMI receiver system are compared to the amplitude setting of the HP 3335A synthesizer level generator The amplitude accuracy of the EMI receiver system is the di erence between the amplitude setting of the HP 3335A synthesizer level generator and the EMI receiver system s measurement Log Fidelity Linear Fidelity Reference Level Switching Uncertainty and...

Page 71: ...T 1 10 dB AT and 0 dB AT Recommended Equipment synthesizer level generator HP 3335A synthesizer level generator cable HP 10503A 122 cm 48 in 50 coax BNC m to BNC m HP 8572A EMI Receiver User s Guide Test Descriptions 3 17 ...

Page 72: ... the HP 3335A synthesizer level generator The amplitude accuracy of the EMI receiver system is the di erence between the amplitude setting of the HP 3335A synthesizer level generator and the EMI receiver system s measurement Log Fidelity Linear Fidelity Reference Level Switching Uncertainty and the accuracy of the EMI receiver system s internal calibration sequence contribute to the amplitude accu...

Page 73: ...Disp Average Noise INPUT 1 Recommended Equipment 50 load HP 11593A 50 BNC m termination HP 8572A EMI Receiver User s Guide Test Descriptions 3 19 ...

Page 74: ...Hz through each RF preselector lter path Measurements are made in linear mode through the QPA CISPR bandwidths and in log mode in a 10 Hz spectrum analyzer resolution bandwidth During these measurements receiver INPUT 1 is terminated with a 50 load Test Settings Settings for Disp Average Noise INPUT 1 QPA Bandwidths Function Band A Band B Band C RF FREQ 9 kHz to 150 kHz 150 kHz to 30 MHz 30 MHz to...

Page 75: ...Sensitivity INPUT 1 20 Hz to 9 kHz Recommended Equipment 50 load HP 11593A 50 BNC m termination HP 8572A EMI Receiver User s Guide Test Descriptions 3 21 ...

Page 76: ...dB AT and 0 dB AT before you perform this test Description Sensitivity INPUT 1 20 Hz to 9 kHz measures the sensitivity of the EMI receiver system at selected frequency intervals between 20 Hz and 9 kHz Measurements are made in log mode with a 10 Hz resolution bandwidth During these measurements receiver INPUT 1 is terminated with a 50 load Test Settings Settings for Sensitivity INPUT 1 20 Hz to 9 ...

Page 77: ...Residual Responses INPUT 1 Recommended Equipment 50 load HP 11593A 50 BNC m termination HP 8572A EMI Receiver User s Guide Test Descriptions 3 23 ...

Page 78: ...curacy you must complete Receiver Calibration INPUT 1 and Amplitude Accy INPUT 1 10 dB AT and 0 dB AT before you perform this test Description Residual Responses INPUT 1 measures the EMI receiver system for residual responses between 9 kHz and 50 MHz The measurements are made with both the RF preselector and spectrum analyzer in 0 dB input attenuation receiver INPUT 1 terminated with a 50 load and...

Page 79: ...andwidth Accuracy Setup 1 Recommended Equipment synthesizer level generator HP 3335A synthesizer level generator cable HP 10503A 122 cm 48 in 50 coax BNC m to BNC m HP 8572A EMI Receiver User s Guide Test Descriptions 3 25 ...

Page 80: ...sizer level generator HP 3335A synthesizer level generator pulse generator HP 8161A programmable pulse generator cable HP 10503A 122 cm 48 in 50 coax BNC m to BNC m adapter HP 1250 0780 N m to BNC f 3 26 Test Descriptions HP 8572A EMI Receiver User s Guide ...

Page 81: ...ed to correct IF gain log delity and bandwidth switching errors in the amplitude response Then the pulse generator output is connected directly to the receiver s input The RF preselector must be put in bypass mode when testing impulse bandwidths of 300 kHz to 3 MHz If this is not done the bandwidth of the RF preselector will predominate resulting in a narrower measured impulse bandwidth These wide...

Page 82: ...Pulse Response Power Meter Calibration Recommended Equipment power meter HP 436A power meter power sensor HP 8482A N m power sensor 3 28 Test Descriptions HP 8572A EMI Receiver User s Guide ...

Page 83: ...eter HP 436A power meter power sensor HP 8482A N m power sensor 3 dB attenuator HP 8491A Option 003 coaxial xed attenuator modulator HP 0955 0533 solid state switch SPST Modulator cables 3 required HP 10503A 122 cm 48 in 50 coax BNC m to BNC m adapter HP 1250 0777 N f to N f adapter HP 1250 0780 N m to BNC f HP 8572A EMI Receiver User s Guide Test Descriptions 3 29 ...

Page 84: ...61A programmable pulse generator 3 dB attenuator HP 8491A Option 003 coaxial xed attenuator modulator HP 0955 0533 solid state switch SPST Modulator cables 3 required HP 10503A 122 cm 48 in 50 coax BNC m to BNC m adapter HP 1250 0777 N f to N f adapter HP 1250 0780 N m to BNC f 3 30 Test Descriptions HP 8572A EMI Receiver User s Guide ...

Page 85: ...cations Power Meter Calibration The measurements start with a calibration of the power meter If the power meter has been calibrated recently the test skips this routine Input Amplitude Calibration The pulse generator is set to dc bias the modulator in its ON state The HP 3335A synthesizer level generator s frequency is set and the amplitude is adjusted so that the power at the output of the 3 dB a...

Page 86: ... determined from the CISPR speci ed spectral intensity the pulse width and the reference setting determined above If the HP 8116A pulse function generator is used the test measures the null spacing of the pulse spectrum to set the pulse width more accurately than the nominal value on the HP 8116A pulse function generator Pulse Measurement The HP 85650A quasi peak adapter is set to normal mode and ...

Page 87: ...Calibration INPUT 2 Recommended Equipment cable HP 8120 4781 61 cm 24 in 50 coax N m to N m adapter HP 1250 0077 N f to BNC m HP 8572A EMI Receiver User s Guide Test Descriptions 3 33 ...

Page 88: ...ed points for amplitude accuracy using the comb generator output These points are chosen by the internal calibration sequence CAL SEQ in the RF preselector receiver INPUT 2 is calibrated between 20 MHz and 2 GHz To make calibrated measurements with the EMI receiver system CAL SEQ must be run for each set of EMI receiver system settings This test runs CAL SEQ at the settings that will be used in su...

Page 89: ...en 10 dB or 0 dB 10 dB or 0 dB 10 dB or 0 dB Scale Linear Linear Linear Settings for Disp Average Noise Input 2 10 Hz RBW Function Settings Auto RF FREQ 20 MHz to 2 0 GHz QPA lter BYPASS RES BW 30 kHz RFPS atten 0 dB SA atten 0 dB Scale Log 10 dB Settings for Residual Responses INPUT 2 Function Settings Auto RF FREQ 20 MHz to 2 0 GHz QPA lter BYPASS RES BW 30 kHz RFPS atten 0 dB SA atten 0 dB Scal...

Page 90: ...B AT Power Meter Calibration Recommended Equipment power meter HP 436A power meter power sensor HP 8481D N m power sensor attenuator HP 11708A APC 3 5 mm f to N m 30 dB xed attenuator 3 36 Test Descriptions HP 8572A EMI Receiver User s Guide ...

Page 91: ...sized sweeper power meter HP 436A power meter power sensor HP 8481D N m power sensor power splitter HP 11667A power splitter cable HP 8120 5140 91 cm 36 in 50 N m to N m adapter HP 1250 1745 APC 3 5 f to N f adapter HP 1250 1475 N m to N m HP 8572A EMI Receiver User s Guide Test Descriptions 3 37 ...

Page 92: ...rrected power meter response and the EMI receiver system measurement is the amplitude accuracy of the EMI receiver system Log Fidelity Linear Fidelity Reference Level Switching Uncertainty and the accuracy of the EMI receiver system s internal calibration sequence contribute to the amplitude accuracy of the EMI receiver system in any valid setting These error contributors are measured in separate ...

Page 93: ...Disp Average Noise INPUT 2 Recommended Equipment 50 load HP 908A 50 N m termination HP 8572A EMI Receiver User s Guide Test Descriptions 3 39 ...

Page 94: ... are made in linear mode through the QPA CISPR bandwidth and in log mode in a 10 Hz resolution bandwidth Test Settings Settings for Disp Average Noise INPUT 2 QPA Bandwidths Function Band B Band C Band D RF FREQ 20 MHz to 30 MHz 30 MHz to 300 MHz 300 MHz to 2 0 GHz QPA lter 9 kHz 120 kHz 120 kHz RES BW 100 kHz 1 MHz 1 MHz VID BW 100 kHz 1 MHz 1 MHz RFPS atten 0 dB 0 dB 0 dB SA atten 0 dB 0 dB 0 dB...

Page 95: ...Residual Responses INPUT 2 Recommended Equipment 50 load HP 908A 50 N m termination HP 8572A EMI Receiver User s Guide Test Descriptions 3 41 ...

Page 96: ...tion INPUT 2 and Amplitude Accy INPUT 2 10 dB AT and 0 dB AT before you perform this test Description The measurements are made with both the RF preselector and the spectrum analyzer in 0 dB input attenuation receiver INPUT 2 is terminated with a 50 load and the quasi peak adapter is in bypass mode 3 42 Test Descriptions HP 8572A EMI Receiver User s Guide ...

Page 97: ...ended Equipment power meter HP 436A power meter power sensor HP 8485D APC 3 5 mm m power sensor attenuator HP 11708A APC 3 5 mm f to N m 30 dB xed attenuator adapter HP 08485 60005 APC 3 5 f to N m HP 8572A EMI Receiver User s Guide Test Descriptions 3 43 ...

Page 98: ...Amplitude Accy INPUT 3 Recommended Equipment cable HP 8120 4781 61 cm 24 in 50 coax N m to N m adapter HP 1250 0077 N f to BNC m 3 44 Test Descriptions HP 8572A EMI Receiver User s Guide ...

Page 99: ... sweeper power meter HP 436A power meter power sensor HP 8485D APC 3 5 mm m power sensor power splitter HP 11667B power splitter cable HP 8120 4921 91 cm 36 in 50 APC 3 5 mm m to APC 3 5 mm m adapter HP 1250 1749 APC 3 5 f to APC 3 5 f HP 8572A EMI Receiver User s Guide Test Descriptions 3 45 ...

Page 100: ...synthesized source as a signal source for the test The signal is sent through a power splitter One output is measured by receiver INPUT 3 The EMI receiver system amplitude response is corrected using the appropriate amplitude characterization data The corrected power meter response is compared to the corrected EMI receiver system amplitude response The di erence between the corrected power meter r...

Page 101: ...alyzer input attenuation The settings used during this test are Settings for Amplitude Accy INPUT 3 Function Settings RF FREQ 1 GHz to 22 GHz QPA lter BYPASS RES BW 1 MHz RFPS BYPASS SA atten 10 dB or 0 dB Scale Log 1 dB HP 8572A EMI Receiver User s Guide Test Descriptions 3 47 ...

Page 102: ...Disp Average Noise INPUT 3 10 Hz RBW Recommended Equipment 50 load HP 909D Option 011 50 3 5 mm f termination 3 48 Test Descriptions HP 8572A EMI Receiver User s Guide ...

Page 103: ...0 Hz RBW measures the displayed average noise level of the EMI receiver system at selected frequency intervals between 1 GHz and 22 GHz Measurements are made with the EMI receiver system in a 10 Hz resolution bandwidth and 0 dB input attenuation receiver INPUT 3 is terminated with a 50 load and the quasi peak adapter is in bypass mode Test Settings Settings for Disp Average Noise INPUT 3 10 Hz RBW...

Page 104: ...Residual Responses INPUT 3 Recommended Equipment 50 load HP 909D Option 011 50 3 5 mm f termination 3 50 Test Descriptions HP 8572A EMI Receiver User s Guide ...

Page 105: ... 0 dB AT in the HP 8571A 8572A EMI Receiver 1 GHz to 22 GHz Calibration Data Manual You must complete Amplitude Accy INPUT 3 before you perform this test Description The measurements are made with the spectrum analyzer in 0 dB input attenuation receiver INPUT 3 terminated with a 50 load and the quasi peak adapter in bypass mode HP 8572A EMI Receiver User s Guide Test Descriptions 3 51 ...

Page 106: ......

Page 107: ... for Overload In dealing with broadband signals such as pulses the levels displayed on the CRT can represent only a small fraction of the total energy applied to the receiver s input Therefore while the level displayed on the CRT may appear within safety limits the peak value actually applied may be beyond the 1 dB compression point To avoid this error analyze the signal response with the 3 dB lin...

Page 108: ...nearly Use the least amount of attenuation necessary to cause linear signal amplitude change Narrowband Broadband Signals The classi cation of a signal as narrowband or broadband depends on the signal s occupied frequency spectrum relative to the resolution bandwidth of the measuring receiver Narrowband Signals Emissions occupying a narrow frequency spectrum relative to the resolution bandwidth ar...

Page 109: ...ions from automobile ignitions systems digital circuits switching power supplies and random noise See Figure 4 3 Figure 4 3 Broadband Spectrum Broadband emissions measurement requires normalization to a reference bandwidth for example 1 MHz Common broadband measurement units are dB V MHz and dB V m MHz eld strength HP 8572A EMI Receiver User s Guide Making Typical Measurements 4 3 ...

Page 110: ...ng displayed in line mode or pulse mode Peak vs Average Select a video bandwidth three to ten times narrower than the resolution bandwidth selected observe smoothing of broadband signals Bandwidth Test Increase or decrease the resolution bandwidth and observe amplitude changes of the signals Changes in amplitude indicate that the signal is a broadband relative to the receiver bandwidth Figure 4 4 ...

Page 111: ... wider than the resolution bandwidth and place the analyzer in normal detection mode Average Detection After the incoming RF input has been mixed down to the IF see Figure 4 5 ltered by the resolution bandwidth lters and ampli ed logarithmically dB or linearly volts it reaches the envelope detector and video lter Envelope detection nds the peak voltage of the signal The video lter is a low pass lt...

Page 112: ...Figure 4 5 Signal Detection and Processing 4 6 Making Typical Measurements HP 8572A EMI Receiver User s Guide ...

Page 113: ...deo bandwidth the greater the averaging will be See Figure 4 6 Figure 4 6 Average Detection Using Video Filtering Because the video lter is in a series with the resolution bandwidth lter sweep time is a ected by the video bandwidth Thus narrow video bandwidths require long sweep times HP 8572A EMI Receiver User s Guide Making Typical Measurements 4 7 ...

Page 114: ...ets of charge and discharge time constants depending on the frequency range selected Because of these fast charge and slow discharge time constants the output of the quasi peak detector depends on the repetition rate of the broadband signal See Figure 4 7 Figure 4 7 Quasi Peak Detection 4 8 Making Typical Measurements HP 8572A EMI Receiver User s Guide ...

Page 115: ...on than for peak detection because of the long time constants in the quasi peak circuitry Measurement Examples These examples show how to use the EMI receiver in manual mode to perform an average measurement and how to make peak and quasi peak measurements on both CW and broadband signals Example Peak Measurement CW Signal In this example a 100 MHz signal will be used as the CW signal 1 Connect th...

Page 116: ...lue no faster than 1 ms A sweep time faster than the value indicated on the table will cause an incorrect amplitude reading 8 Press 4SHIFT5 C on the spectrum analyzer to read amplitude in dB V 9 To select the preampli er BYPASS path press 0 4 5 on the switch driver The LED in the key will light 10 Disconnect the signal source Connect the preselector comb generator output to the input of the presel...

Page 117: ...Q light does not turn o when parameters other than the frequency range start and stop frequency are changed Therefore you may have an uncalibrated state while the CAL SEQ light is on Be sure the receiver is calibrated for the current instrument settings 13 Disconnect the preselector section s comb generator output and reconnect the signal source to receiver INPUT 2 Use the same cable during measur...

Page 118: ...elector to add 10 dB of attenuation Repeat the linearity check with the 3 dB attenuator Add attenuation if necessary until the overload or gain compression is eliminated If the attenuation is increased the receiver should be recalibrated with the new attenuator setting for best accuracy Example Peak Measurement Broadband Signal This measurement uses a pulse generator and measures the 15 MHz to 16 ...

Page 119: ...dth scale attenuation or input port after calibration The start and stop frequencies may be changed after calibration if the frequency range stays within the range at which the receiver was calibrated Manually set critical system parameters manually such as resolution bandwidth Parameters that are set manually will not change during the calibration routine parameters that are still in the auto cou...

Page 120: ...ntroduce an amplitude error 13 Press 4MAX HOLD5 on the spectrum analyzer Allow the display to ll in 14 Press 4PEAK SEARCH5 on the spectrum analyzer and read the marker amplitude on the display Refer to Figure 4 10 Figure 4 10 Peak Measurement of a Broadband Signal Example Microwave Peak Measurement CW Signal This example makes peak or average measurements on a microwave signal in the 2 GHz to 22 G...

Page 121: ...calibration chart Enter this value in the receiver with 4SHIFT5 4REF LEVEL5 Because this o set accounts for the gain of the preampli er use 4 dBm5 to make the resulting reference level o set a negative number 13 Tune the receiver to the signal with 4CENTER FREQUENCY5 and 4SPAN5 14 Use 4PEAK SEARCH5 to place a marker on the top of the signal to be measured 15 Press 4PRESEL PEAK5 on the spectrum ana...

Page 122: ...imiting bandwidth in the IF and the special quasi peak bandwidth lter would have no e ect 7 Set the spectrum analyzer center frequency to 100 MHz and the span to 1 MHz 8 Press the LIN key on the spectrum analyzer 9 Change the reference level to bring the signal amplitude near the top of the display 10 On the spectrum analyzer press 4SHIFT5 C to read the amplitude in dB V 11 Disconnect the signal s...

Page 123: ...ged Therefore you may have an uncalibrated state while the CAL SEQ light is on Be sure the receiver is calibrated for the current instrument settings 13 Disconnect the preselector section s comb generator output and reconnect the signal source to receiver INPUT 2 Use the same cable during measurements that you used for calibration the system has compensated for the loss in this cable Remember to a...

Page 124: ...IFT5 C to read amplitude in dB V 4 Disconnect the signal source Connect the preselector section s COMB GENERATOR OUTPUT to the receiver input used in the measurement Note Before calibrating the system Make sure all equipment settings are correct Do not change the resolution bandwidth scale attenuation or input port after calibration The start and stop frequencies may be changed after calibration i...

Page 125: ...ember to account for the losses in the calibration cable if you do not use that same during the actual measurement Using other cables may introduce an amplitude error 7 The table on the front of the quasi peak adapter section shows the sweep time to use with quasi peak detection ON With a signal in the 0 03 to 1 GHz band and span set to 1 MHz the sweep time must at least 200 seconds Note An altern...

Page 126: ...eak adapter This video ampli er boosts the signal by a factor of ten allowing accurate measurements If you use the quasi peak adapter 4X105 ampli er subtract 20 dB from the marker amplitude shown on the display Whenever a voltage is multiplied by a factor of ten in terms of dB there is a 20 dB di erence 9 Press 4MAX HOLD5 on the spectrum analyzer and allow the receiver to sweep for several seconds...

Page 127: ... 1 5 Set the EMI receiver as follows 4START FREQ5 15 MHz 4STOP FREQ5 16 MHz 4RES BW5 100 kHz 4VIDEO BW5 100 kHz 4SWEEP TIME5 100 ms QPA BW 9 kHz QPA NORMAL Amplitude scale LIN 6 Because the signal of interest is in the 0 15 to 30 MHz region the 9 kHz quasi peak bandwidth QPA BW is selected Refer to the table on the front of the quasi peak adapter and set the spectrum analyzer resolution and video ...

Page 128: ...tion is corrected by an internal preselector section gain adjustment The CAL SEQ LED ashes while the calibration routine runs Note After calibration the CAL SEQ LED stays on indicating that the system is calibrated over the current frequency range If the frequency range is increased beyond the calibrated frequency range the light turns o to indicate an uncalibrated state However the CAL SEQ light ...

Page 129: ... frequency range test setup transducer and procedures Military conducted tests are performed in a shielded enclosure on a test bench with a copper or brass ground plane The ground plane usually is bonded directly to the wall of the shielded enclosure A major goal of the test setup is to isolate the EMI receiver and tested device from emissions caused by the power mains serving the enclosure Isolat...

Page 130: ...nt level associated with a particular voltage the transfer impedance Z of the probe must be known By subtracting the transfer impedance dB from the voltage dB V measured on the receiver the equivalent current dB A can be calculated As an alternate a composite limit in dB V may be determined by adding Z dB to the limit dB A Be careful not to exceed the current rating limitations of the probe as thi...

Page 131: ... referred to a particular bandwidth Thus narrowband measurements are made in units of voltage current or eld strength while broadband measurements are made in these same units referred to a bandwidth usually 1 MHz If broadband measurements are made in a bandwidth di erent from the reference bandwidth a correction factor must be added to the measurement For coherent broadband signals use a 20log co...

Page 132: ...cted to a vehicle system or installation For portable equipment such as hand tools o ce machines and manpack operable equipment the test sample is placed on a one meter high non metallic test stand facing the antenna The test is made in a shielded enclosure with the receiving antenna at least one meter away from all walls of the enclosure The measurement equipment should be placed outside the encl...

Page 133: ...d test 14 kHz to 1 GHz Does not apply to radiation from antennas Vertical and horizontal polarization must be tested above 30 MHz Probe with a loop to nd the point of maximum emission and orient this point one meter from antenna For large equipment or systems the antenna should be moved to test a one meter distance from various points Typical antennas 14 kHz to 30 MHz active rod HP 11966B 30 to 30...

Page 134: ...0 kHz 30 MHz QUASI PEAK DETECTOR 4OFF5 If you observe emissions that exceed the regulatory limits at some frequencies you may zoom in for further analysis After you adjust the reference level and set the span and sweep time turn on the quasi peak detector 4RES BW5 100 kHz 4VIDEO BW5 100 kHz 4START FREQ5 lower frequency of regulatory limit 450 kHz for the FCC 150 kHz for VDE CISPR 4STOP FREQ5 30 MH...

Page 135: ...easurements a shielded enclosure can be used to locate emissions but not to measure emission amplitudes or Select a relatively narrow span for example 1 MHz then tune the center frequency keeping track of emissions as they are observed The relatively narrow span is required in order to distinguish between ambient and signals from the EUT At open sites ambient signals must be distinguished from sig...

Page 136: ...Radiated Emissions The conclusive way to distinguish between ambient and emitted signals is to turn o the EUT If the signals disappear they were being emitted by the EUT See Figure 4 20 Figure 4 20 Equipment Under Test EUT Turned Off As an additional complication in making radiated measurements some regulatory test procedures require the EUT to be rotated 4 30 Making Typical Measurements HP 8572A ...

Page 137: ...ements radiated emission measurements are rst made using peak detection INSTR FUNCTION NORMAL FREQUENCY BAND 03 1 GHz QUASI PEAK DETECTOR 4OFF5 If you observe emissions that exceed the regulatory limits at some frequencies you may zoom in for further analysis After you adjust the reference level and set the span and sweep time turn on the quasi peak detector 4RES BW5 1 MHz 4VIDEO BW5 1 MHz Frequen...

Page 138: ......

Page 139: ...he system over a wide frequency range You may prefer to calibrate each input to correspond to a particular band before making measurements because you then would not have to calibrate the system many times over smaller frequency ranges 1 Place the DLP overlay on the spectrum analyzer section numeric keypad 2 Press 4INSTR PRESET5 on the quasi peak adapter and on the preselector 3 Press the INPUT 1 ...

Page 140: ...utine parameters that are still in the auto coupled mode may change during the calibration routine On the preselector press CAL SEQ 4START5 The spectrum analyzer will measure selected comb teeth Any variation between the measured comb tooth stored in the preselector section is corrected by an internal preselector section gain adjustment The CAL SEQ LED ashes while the calibration routine runs Note...

Page 141: ...ey on the switch driver The LED in the key will light Place a marker on the signal of interest Press 4SHIFT5 455 4Hz5 to start the quasi peak measurement Note The DLP automatically sets the equipment to the proper settings For quasi peak measurements the receiver is switched to linear mode only during the measurement after the measurement is completed the receiver is switched back to log mode The ...

Page 142: ...Position the marker on another signal and perform another quasi peak measurement Up to six quasi peak values can be measured 5 4 Downloadable Program DLP Measurements HP 8572A EMI Receiver User s Guide ...

Page 143: ...ta disks 1 12 calibration table 1 8 CAL SEQ 1 4 3 13 CE03 measurement 4 23 changing default equipment 2 22 changing equipment model numbers 2 11 changing power sensor calibration factors 2 26 CISPR 22 conducted emission measurement 4 28 radiated emission measurement 4 29 commercial compliance measurements 4 5 compliance measurements 4 5 corrected mode spectrum analyzer 1 14 D default equipment cha...

Page 144: ...n 1 5 correcting preampli er gain 1 8 manual measurements 1 11 preselector peaking 1 7 internal calibrator sequence 3 13 L linearity check 4 2 line frequency changing the settings 2 21 loading the software 2 3 M manual measurements 1 11 measurement CE03 4 23 RE02 4 26 measurements CISPR 22 4 28 N narrowband signals 4 2 O operation veri cation amplitude accy INPUT 1 10 dB AT and 0 dB AT 3 17 amplit...

Page 145: ...r sensor calibration factors 2 26 preampli er gain 1 8 preselector peaking for INPUT 3 1 7 printing test results 2 7 problems amplitude error 1 7 disk drive behaving erratically 2 2 displayed signals above 2 GHz display lower 1 7 the display doesn t look like the example in the book 2 1 uncalibrated state with CAL SEQ LED still on 1 4 using spectrum analyzer corrected mode 1 14 Q quasi peak detect...

Page 146: ... Executive Program assigning serial numbers 2 10 changing default equipment settings 2 22 changing equipment model numbers 2 11 changing humidity settings 2 20 changing line frequency settings 2 21 changing temperature settings 2 19 checking the equipment 2 11 exiting the program 2 13 getting started 2 5 outputting results 2 7 receiver information 2 6 selecting equipment 2 9 testing for overload 4...

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