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Agilent Technologies E8257D Скачать руководство пользователя страница 9

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User’s and Service Guide

E8257D Option HAR

Description

Description

The E8257D Option HAR is a frequency divider designed to provide improved phase noise
in the 0.98 MHz to 500 MHz frequency range of the E8257D Signal Generator.

The Option HAR uses frequency division as a replacement for heterodyne mixing to create
frequencies in the 0.98 to 500 MHz range. This provides improved phase noise in this
mode. The mode will be referred to as “Divider Mode” throughout this document.

Verifying the Shipment

After the unit has been unpacked, keep the original packaging materials so it can be
used if you need to transport the instrument.

After the test set has been unpacked, keep the original packaging materials so they can be
used if you need to transport the instrument.Inspect the test set and all accessories for any
signs of damage that may have occurred during shipment. If your test set or any
accessories appear to be damaged or missing refer to

“Contacting Agilent Sales and Service

Offices” on page 26

Block Diagram

Figure 1

Block Diagram

/ 2

N

Output Board

p/o Frac N board

0.25-3.2

GHz

ALC

/ 2

N

Ramp Swp

Scan

1GHz from

Ref board

Divider assembly

/ 2

N

/ 2

N

1

2

1

2

Opt 1EH

Filters

1 - 250 MHz

Digital Control

TC226

From ALC

board

ALC

P1

P2

P4

P3

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7
8
9
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Содержание E8257D

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Страница 2: ...Agilent Technologies Agilent E8257D Option HAR User s and Service Guide ...

Страница 3: ...urnished under a license and may be used or copied only in accordance with the terms of such license Restricted Rights Legend If software is for use in the performance of a U S Government prime contract or sub contract Software is delivered and licensed as Commercial computer soft ware as defined in DFAR 252 227 7014 June 1995 or as a commercial item as defined in FAR 2 101 a or as Restricted comp...

Страница 4: ... understood and met Definitions Specifications describe the performance of parameters covered by the product warranty temperature 0 to 55 C unless otherwise noted Typical describes additional product performance information that is not covered by the product warranty It is performance beyond specification that 80 of the units exhibit with a 95 confidence level over the temperature range 20 to 30 C...

Страница 5: ...iv ...

Страница 6: ... Procedure 13 Making the 10 MHz Measurement 15 100 MHz Phase Noise Test Limits 16 100 MHz Test Procedure 16 Making the 100 MHz Measurement 18 Appendix 19 Modifying Synthesizer Self Test Limits 19 Safety and Regulatory Information 20 Introduction 20 Cleaning the Instrument 20 Connector Care and Cleaning 20 Declaration of Conformity 20 Statement of Compliance 21 Shipping Instructions 21 Compliance w...

Страница 7: ...Contents 2 Contents ...

Страница 8: ...User s and Service Guide 1 E8257D Option HAR ...

Страница 9: ...s been unpacked keep the original packaging materials so it can be used if you need to transport the instrument After the test set has been unpacked keep the original packaging materials so they can be used if you need to transport the instrument Inspect the test set and all accessories for any signs of damage that may have occurred during shipment If your test set or any accessories appear to be ...

Страница 10: ...Mode is left on for frequencies outside of 0 98 to 500 MHz the ALC Bandwidth will be limited to 100 Hz Phase Noise Divider Mode On Divider Mode Off Standard performance per the E8257D data sheet Maximum Level Output Power Divider Mode On Typical performance see Table 4 and Table 5 on page 5 Divider Mode Off Table 1 E8257D Option HAR Specifications1 25 C 1 16 dBm Frequency 1 Hz 10 Hz 100 Hz 1 kHz 1...

Страница 11: ...0 MHz 86 112 129 144 149 149 160 MHz 81 107 122 142 145 145 250 MHz 76 104 121 138 142 142 500 MHz 70 98 115 132 136 136 Table 4 Option 520 Maximum Leveled Output Power1 dBm2 Typical 3 1 Amplitude accuracy is not specified in diver mode 2 Divider Mode On 3 Option 1EA installed Divider mode on without Option IEA max power is the lower of 10 dBm or refer to Table 4 Carrier Frequency Lowband Filter O...

Страница 12: ...out Option IEA max power is the lower of 10 dBm or refer to Table 5 Carrier Frequency Lowband Filter Off On4 4 For improved amplitude accuracy the lowband filters must be on 1 MHz 15 15 10 MHz 15 10 100 MHz 15 9 160 MHz 15 8 250 MHz 15 8 500 MHz 13 9 Table 6 Harmonic Level dBc1 Typical 2 1 Divider Mode On 2 Harmonic levels in divider mode are high the output is a square wave Carrier Frequency Lowb...

Страница 13: ...1 25 MHz to 62 5 MHz 125 62 5 MHz to 125 MHz 250 125 MHz to 250 MHz 500 250 MHz to 500 MHz 1000 Table 8 Maximum Phase Modulation Typical 1 1 Divider Mode On Carrier Frequency Normal Bandwidth Mode radians High Bandwidth Mode radians 0 98 MHz to 1 953 MHz 0 0039063 0 0039063 1 953 MHz to 3 906 MHz 0 0078125 0 0078125 3 906 MHz to 7 813 MHz 0 015 625 0 015 625 7 813 MHz to 15 63 MHz 0 03125 0 03125 ...

Страница 14: ... below 500 MHz Pulse Modulation Divider Mode On Standard Pulse UNU can not be used in divider mode Option UNW can be used Divider Mode Off Pulse On Off ratio is degraded by 10 dB from 2 0 to 3 2 GHz in Standard Pulse UNU Option UNW is not affected ALC Performance The ALC bandwidth is limited to 100 Hz in divider mode Operation with ALC off is not recommended Ramp Sweep Ramp Sweep is unavailable wi...

Страница 15: ...e normal preset state is Off The SCPI command is as follows SOURce LFDivider ON OFF 1 0 SOURce LFDivider Figure 2 Frequency Divider Circuitry E8257D Option HAR Using the E5500 Phase Noise Measurement Subsystem The E5500 software currently does not recognize Option HAR To improve reference phase noise when using your E8257D Option HAR with the E5500 manually turn the Divider Mode On refer to Operat...

Страница 16: ...ivider Mode On or Off licenses are needed for the following options Option HAR Option 1EH 3 If the Phase Noise in Divider Mode is does not meet specification refer to Performance Test on page 11 replace the Divider Assembly 4 Measure the losses through Option HAR in Standard Mode Divider Mode Off Figure 3 Divider Assembly with Connectors Labeled Table 9 Divider Assembly Assembly Path Frequency Los...

Страница 17: ...Lowband Filter Assembly J6 pin 23 24 or 26 is incorrect 1 Replace the Lowband Filter Assembly 2 If the Lowband Filter Assembly is working properly replace the ribbon cable from the Lowband Filter Assembly to the Divider Assembly 8 Set the instrument frequency to 1 MHz Output power to maximum and RF On 9 With all other cables connected make the following measurements on the Divider Assembly with a ...

Страница 18: ...n page 19 to modify the self test limits Performance Test Table 10 Replaceable Parts Description Agilent Part Number Option 1EH Board E8251 60595 Div Board E8251 60433 Ribbon Cable E8251 60594 Cable Frac N to Div E8251 20394 Cable Div to Lowband filter E8251 20395 Cable Lowband Out to Div E8251 20396 Cable Div to Lowband filter E8251 20397 Table 11 Performance Test Equipment Instrument Critical Sp...

Страница 19: ...nter the GPIB address of the E8257D Example 19 Step 8 Verify that the Library field identifies Agilent Technologies VISA Step 9 Click Next Finish Step 10 In the list of Sources select Agilent E8257D Step 11 Select the icon with the green check mark Verify that the connection to the selected asset has been completed Press OK Step 12 Verify that the Library field identifies Agilent Technologies VISA...

Страница 20: ...8 158 50 KHz 1600 MHz P O Phase Noise Measurement System TO NOISE SOURCE Input on Rear Panel Spectrum Analyzer INPUT 50 Ω 9 kHz 1 5 GHz PC Controller Digitizer Digitizer Output Digitizer Input Frequency Counter Channel 1 EXT 1 Input RF OUTPUT 50 Ω 70420A 001 Test Set SIGNAL NOISE RF Analyzer MONITOR ANALYZER ANALYZER 100 kHz 100 MHz From Down Converter To Down Converter TUNE VOLTAGE 15 dBm min 1 2...

Страница 21: ...O Tune Range 5 Volts VCO Input Resistance 600 Ohms Cal Tab Measure Phase Detector Constant Measure Phase Detector Constant Calculate VCO Tune Constant Measure VCO Tune Constant Verify calculated phase lock loop suppression Check If Limit is exceeded Use Theoretical Value Block Diagram Tab Carrier Source Manual Downconverter None Reference Source Agilent E8257D Phase Detector Mode Automatic Detecto...

Страница 22: ...n Out on the 70427A rear panel to the Signal Input on the 70420A Step 6 Turn On the Divider Mode Refer to Operation on page 8 Step 7 Select Continue and allow Phase Noise Measurement to complete Step 8 Compare the estimated mean value of the trace with the noise specification line lower line If the estimated mean value of the trace falls on or below the specification line the LNSG is regarded as h...

Страница 23: ...g the E5504B Phase Noise Measurement System Step 1 Select Define Limit Lines Step 2 Enter the Noise Spec data Table 14 under the Upper Noise Limit tab Step 3 Select Define Measurement Refer to Table 15 Table 14 Phase Noise Test Limits 100 MHz 1 Hz 10 Hz 100 Hz 1 kHz 10 kHz 100 kHz Noise Spec 73 100 122 140 145 145 ...

Страница 24: ...x 100 MHz 10 Hz Volt VCO Tune Range 5 Volts VCO Input Resistance 600 Ohms Cal Tab Measure Phase Detector Constant Measure Phase Detector Constant Calculate VCO Tune Constant Measure VCO Tune Constant Verify calculated phase lock loop suppression Check If Limit is exceeded Use Theoretical Value Block Diagram Tab Carrier Source Manual Downconverter None Reference Source Agilent E8257D Phase Detector...

Страница 25: ...e 13 Step 5 Turn On the Divider Mode Refer to Operation on page 8 Step 6 Select Continue and allow Phase Noise Measurement to complete Step 7 Compare the estimated mean value of the trace with the noise specification line lower line If the estimated mean value of the trace falls on or below the specification line the LNSG is regarded as having met the noise specification Step 8 Print the E5500 Pha...

Страница 26: ...e as shown http xxx xxx xxx xxx update 1 Enter the following text in the Manual Update form as shown below ll SYNTH 14 0 5 ul SYNTH 14 13 5 ll SYNTH 15 0 5 ul SYNTH 15 13 5 ll SYNTH 16 1 5 ul SYNTH 16 13 5 ky 53004 2 Press Execute next to the manual update form When the update is complete Operation Completed will be displayed 3 Cycle the power on the instrument If you need to revert to the standar...

Страница 27: ... ventilated area Allow all residue alcohol moisture to evaporate and the fumes to dissipate prior to energizing the instrument WARNING Keep isopropyl alcohol away from heat sparks and flame Store in a tightly closed container It is extremely flammable In case of fire use alcohol foam dry chemical or carbon dioxide water may be ineffective Use isopropyl alcohol with adequate ventilation and avoid c...

Страница 28: ... on page 26 Always transport or ship the instrument using the original packaging if possible If not comparable packaging must be used Attach a complete description of the failure symptoms Compliance with Canadian EMC Requirements This ISM device complies with Canadian ICES 001 Cet appareil ISM est conforme a la norme NMB du Canada Compliance with German FTZ Emissions Requirements This product comp...

Страница 29: ...ded side of the ac power supply Cautions applicable to this instrument CAUTION Always use the three prong ac power cord supplied with this instrument Failure to ensure adequate earth grounding by not using this cord can cause instrument damage CAUTION This product is designed for use in Installation Category II and Pollution Degree 2 per IEC 61010 Second Edition and 664 respectively CAUTION This i...

Страница 30: ...terruption of the protective conductor inside or outside the product is likely to make the product dangerous Intentional interruption is prohibited WARNING These servicing instructions are for use by qualified personnel only WARNING The opening of covers or removal of parts is likely to expose dangerous voltages Disconnect the instrument from all voltage sources while it is being opened WARNING Th...

Страница 31: ...when handling components and assemblies or when making connections always wear a heel strap 9300 1126 when working in an area with a conductive floor If you are uncertain about the conductivity of your floor wear a heel strap always ground yourself before you clean inspect or make a connection to a static sensitive device or test port You can for example grasp the grounded outer shell of the test ...

Страница 32: ... the OFF position This symbol is used to identify a terminal which is internally connected to the product frame or chassis The CE mark is a registered trademark of the European Community If accompanied by a year it is when the design was proven The CSA mark is a registered trademark of the Canadian Standards Association This instrument complies with Canada CSA 22 2 No 000000061010 1 Second Edition...

Страница 33: ... Internet at http www agilent com find assist You can also purchase accessories or documentation items on the Internet at http www agilent com find If you do not have access to the Internet contact your field engineer NOTE In any correspondence or telephone conversation refer to the product by its model number and full serial number With this information the Agilent representative can determine wh...

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