NASA/Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135

59 -- VOLTAGE SOURCE, ELECTROMETER AND CURRENT AMPLIFIER FROM KEITHLEY INSTRUMENTS, INC. SOL 3-139728 DUE 022900 POC Jon C. Schultz, Contract Specialist, Phone (216) 433-2764, Fax (216) 433-2480, Email Jon.C.Schultz@grc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.msfc.nasa.gov/cgi-bin/EPS/bizops.cgi?gr=D&pin=22#3-139728. E-MAIL: Jon C. Schultz, Jon.C.Schultz@grc.nasa.gov. THIS NOTICE CONSTITUTES AMENDMENT NO. 1 TO SOLE SOURCE SYNOPSIS FOR VOLTAGE SOURCE, ELECTROMETER AND CURRENT AMPLIFIER FROM KEITHLEY INSTRUMENTS, INC. Companies shall acknowledge all amendment(s) in their quote. This notice serves as the official amendment to subject synopsis and a written amendment will not be issued. The purpose of this amendment is to change the description of Item 3 from: " 2 ea. Keithley Model 428 Current Amplifiers " to " 2 ea. Keithley Model 428 PROG -- Programmable Current Amplifiers ". . The due date for receipt of offers is extended to 4:30 p.m. local time on 29 February 2000. Companies shall provide the information stated in the synopsis/RFQ posted on the NASA Acquisition Internet Service (NAIS) on [ENTER DATE]. Documents related to this procurement are available over the Internet and are in Microsoft Office Suite (Word 6.0, Excel 5.0, or PowerPoint 4.0) format and reside on the World Wide Web (WWW) server which may be accessed using a WWW browser application. The Internet site, or URL, for the NASA/GRC Business Opportunities home page is http://nais.msfc.nasa.gov/cgi-bin/EPS/bizops.cgi?gr=CL&pin=22 Posted 02/23/00 (D-SN427912). (0054)

Loren Data Corp. http://www.ld.com (SYN# 0215 20000225\59-0005.SOL)