Agilent Technologies 281A/B Service Manual

Agilent Technologies 382A Variable AttenuatorOperating and Service ManualAgilent Part Number: 00382-90037Printed in USAPrint Date: July 2001Supersedes

2 Agilent 382A Operating and Service Manual OverviewWhen the tension is released, the drive cable can jump out of the grooved portion of the drum, in

Agilent 382A Operating and Service Manual 3SpecificationsSpecificationsTable 1 SpecificationsCharacteristic X382A P382A K382A R382AFrequency range (G

4 Agilent 382A Operating and Service Manual OperationOperationAlign Flanges The height of the 382A should be adjusted carefully so that precise alignm

Agilent 382A Operating and Service Manual 5OperationWhen all films are aligned, the E field of the applied field is normal to all films. When this oc

6 Agilent 382A Operating and Service Manual Operationat all frequencies. Therefore, above cutoff of the TE21 mode, in the top one-quarter of the frequ

Agilent 382A Operating and Service Manual 7OperationSpecifications DeterminationTable3 outlines the test procedure necessary to determine if the 382A

8 Agilent 382A Operating and Service Manual OperationStanding Wave Ratio This test will obtain the SWR by measuring the reflection coefficient and cal

Agilent 382A Operating and Service Manual 9OperationSet calibrating attenuator to zero and replace short with terminated attenuator to be tested. Tri

10 Agilent 382A Operating and Service Manual OperationNOTE This procedure does not correct for other system errors8. Repeat this measurement with th

Agilent 382A Operating and Service Manual 11OperationResidual Attenuation This test measures the minimum loss introduced into a system by the use of

ii Agilent 382A Operating And Service ManualNoticeThe information contained in this document is subject to change without notice. Agilent Technologies

12 Agilent 382A Operating and Service Manual OperationModing Test The following test determines that the attenuator is functioning at all frequencies

Agilent 382A Operating and Service Manual 13Operation6. If excessive backlash is found, refer to Figure 5 and complete the rest of the procedure. If

14 Agilent 382A Operating and Service Manual OperationSetting The Dial The dial will need resetting if a new dial is installed, if the stops have been

Agilent 382A Operating and Service Manual 15OperationAttenuator CalibrationCalibrate 10 dB System Error Since we are to calibrate the attenuator in 1

16 Agilent 382A Operating and Service Manual Operation8. Read SWR meter and determine attenuation change from reference reading. Subtract the calibra

Agilent 382A Operating and Service Manual 17MaintenanceMaintenanceNo maintenance is required on the K382A or the R382A. On other models, the only mai

18 Agilent 382A Operating and Service Manual MaintenanceNOTE Center card passes thru the horizontal and meets a stop approximately 1/32 of an inch be

Agilent 382A Operating and Service Manual 19MaintenanceFigure 7 Agilent 382A Attenuator Assembly Detail

20 Agilent 382A Operating and Service Manual MaintenanceCenter Section ResistiveCard Replacement1. Remove flag cable from center section. Clean secti

Agilent 382A Operating and Service Manual 21Maintenance5. Apply conductive silver paint (Acheson Industries, Electodag 5065S, Agilent Stock No. 9260

Agilent 382A Operating And Service Manual iii What You’ll Find In This Manual…• Overview, page1• Specifications, page3• Operation, page4• Maintenan

22 Agilent 382A Operating and Service Manual MaintenanceNOTE To identify the emulsion side, scratch the extreme edge (that portion which will be cove

Agilent 382A Operating and Service Manual 23MaintenanceNOTE Do not remove pins; just loosen screws. Steps 5 through 12 must be completed before silv

24 Agilent 382A Operating and Service Manual Maintenance2. Drive locator pins from end section (see Figure 12).Figure 12 Installation of Resistive Ca

Agilent 382A Operating and Service Manual 25MaintenanceFigure 14 Application of Conductive Silver Paint o End Section6. Install end card with emulsi

26 Agilent 382A Operating and Service Manual Maintenance7. Check backlash by applying inward pressure on the knob end of the shaft. The shaft should

Agilent 382A Operating and Service Manual 27Replacement Parts ListReplacement Parts ListThis section contains replaceable parts for the 382A.Table4 l

28 Agilent 382A Operating and Service Manual Replacement Parts List14A End Section (without Resistive Card)P X K4R4333300382-6000700382-6000900382-200

Agilent 382A Operating and Service Manual 29Replacement Parts ListCode List of ManufacturesCode No. Manufacturer Address1 Cole Rubber and Plastics In

30 Agilent 382A Operating and Service Manual Replacement Parts List

iv Agilent 382A Operating And Service ManualWarrantyCustom systems are warranted by contractual agreement between Agilent Technologies and the custome

Agilent 382A Operating And Service Manual v Service and SupportAny adjustment, maintenance, or repair of this product must be performed by qualifie

vi Agilent 382A Operating And Service ManualSafety and Regulatory InformationReview this product and related documentation to familiarize yourself wit

Agilent 382A Operating And Service Manual vii Safety Earth GroundBefore Applying PowerVerify that the product is configured to match the available

viii Agilent 382A Operating And Service ManualThis page is intentionally left blank.

Agilent 382A Operating and Service Manual 1OverviewThe Agilent Technologies 382A variable precision attenuators are designed for use in waveguide sys