EXHIBIT 23 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in Registration Statement No. 333-42413 of Tektronix, Inc. on Form S-8 of our report dated June 24, 2005, appearing in this Annual Report on Form 11-K of the Tektronix 401(k) Plan for the year ended December 31, 2004. /s/ DELOITTE & TOUCHE LLP Portland, Oregon June 24, 2005