Download HP 3403C SM service manual & repair info for electronics experts. The 3403C is a discontinued product; this manual is provided for information only. 3403C True RMS Voltmeter Operating and Service Manual. User Manuals Printed: August 1977 Manual P/N: 03403-90005 Service Manual: YES Serial Numbers: 1452A01001 and Higher CONDITION: Used, but in Nice Condition. HP 3403C TRUE RMS VOLTMETER OPERATING & SERVICE MANUAL. admin. Shipping to: United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria,2nd pic if shown will have what serial numbers the manual covers and other info. These manuals are available for download and free of charge. Do not be tricked into paying for a Manual for the HP Model 3403C True RMS Voltmeter. Title & Document Type: 3403C True RMS Voltmeter Operating and. Service Manual This manual may contain references to HP or Hewlett-Packard.