Agilent Technologies 8904A User's Manual
Contents
1. 8904A 04 S E R V I C E N O T E SUPERSEDES None 8904A Multifunction Synthesizer Option 006 H16 Serial Numbers 2948A04593 2948A04693 Replacement of Audio Transformer to Correct Inverted Waveform Parts Required 9100 4833 Audio Transformer Situation Some 8904A Multifunction Synthesizer Option 006 H16 with serial numbers listed above may have inverted OUTPUT 1 waveforms This is because the primary of Audio Transformer T1 was wound backwards resulting in a 180 degree phase shift from the pri mary to the secondary OUTPUT 2 waveforms are not affected The most noticeable waveform is the ramp because it is asymmetrical Sinewave square and triangle waveforms are inverted but are less noticeable because they are symmetrical Normally the ramp waveform starts at the negative peak and ramps up to the positive peak Suspect units will exhibit an inverted ramp waveform i e the ramp starts at posi tive peak and ramps down to the negative peak NOTE Option 006 H16 is not indicated on the front panel LCD display when ann instru ment preset is performed Verify if Option 006 H16 is installed by inspecting the option labelon the rear panel of the unit Continued DATE 01 January 1992 ADMINISTRATIVE INFORMATION SERVICE NOTE CLASSIFICATION MODIFICATION RECOMMENDED ACTION L IMMEDIATELY STANDARDS CATEGORY MM ON SPECIFIED FAILURE LABOR 1 0 Hours MM AGREEABLE TIME LOCATION L CUSTOMER INSTALLABLE SERVICE C RETU2. RN USED L RETURN CATEGORY LJ ON SITE INVENTORY SCRAP PARTS SCRAP WB SERVICE CENTER O SEE TEXT O SEE TEXT AVAILABILITY PRODUCT S SUPPORT LIFE RESPONSIBLE UNTIL 1000 UNTIL 01 January 1997 AUTHOR LHL ENTITY 1000 ADDITIONAL INFORMATION 1991 AGILENT TECHNOLOGIES ao PRINTED IN U S A ii Agilent Technologies 1 of 2 Page 2 Service Note 8904A 04 Solution Action Configure the unit to output a ramp waveform from OUTPUT 1 at approximately 1 kHz and 1 Volt Verify with an oscilloscope whether the ramp waveform is inverted ramps down instead of up If this behavior is unwanted then replace T1 with the part number noted above
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