Keysight E8251-60690 Installation and operation manual

Keysight E8257D/67D and E8663D PSG
Signal Generators Add Option UNY
(Enhanced Ultra-Low Phase Noise)
Kit Part Numbers: E8251-60690 and E8251-60990
Part Number: E8251-90396
Supersedes: July 2013
Printed in USA: August 2014
Installation Note

Notice.
The information contained in this document is subject to change without notice.
Keysight Technologies makes no warranty of any kind with regard to this material, including but
not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Keysight Technologies shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or use of this material.
© Copyright 2006-2014 Keysight Technologies, Inc.

Installation Note E8251-90396 3
Add Option UNY (Enhanced Ultra-Low Phase Noise)
Kit Part Numbers: E8251-60690
Introduction
This upgrade kit adds Option UNY (Enhanced Ultra-Low Phase Noise Performance) to an
E8257D, E8663D (Analog) or E8267D (Vector) PSG Signal Generator. This kit applies to
instruments that have either a standard crystal oscillator or Option UNX.
Installation includes the following major steps, starting on page 5:
1. Check signal generator functionality.
2. Check firmware version and upgrade if <C.06.15.
3. Remove the outer and inner signal generator covers.
4. Remove the A32 10 MHz Crystal Oscillator.
5. Install the A32 10 MHz Crystal Oscillator.
6. Remove and replace A5 with A46 and A6 with A45.
7. Install A43 board and cables.
1
8. Activate Option UNY.
9. Verify proper installation of Option UNY.
10.Re-assemble the signal generator.
11.Update calibration arrays.
12.Verify signal generator calibration.
Products Affected: E8257D/67D and E8663D
Serial Numbers: >MY/SG/US5042xxxx
Options: N/A
To Be Performed By: (X) Keysight Service Center
Estimated Installation Time:
Estimated Verification Time:
2.0 Hours
2.0 Hours
1. For instruments with serial prefixes >US5150/MY5150.

4Installation Note E8251-90396
Installation Kit Parts List
E8251-60690
E8251-60990
(For E8257D and E8663D with serial prefix > US5150/MY5150)
Tools Required
❏TORX T-10 driver
❏TORX T-15 driver
❏TORX T-20 driver
❏Needle-nose pliers
Item Quantity Description Keysight Part Number
1 1 W155 Cable A33/A33 75G 8121-0646
2 1 Assembly, Frac-N, Used with Offset Loop E8251-60437
3 1 Assembly, Offset Loop E8251-60438
4 1 Oscillator Assy - UNY E8251-60798
5 1 Installation Note E8251-90396
Item Quantity Description Keysight Part Number
1 1 Cable A33/A33 75G 8121-0646
2 1 Assembly, Frac-N, Used with Offset Loop E8251-60437
3 1 Assembly, Offset Loop E8251-60438
4 1 Oscillator Assy - UNY E8251-60798
5 1 Cable Retainer E8251-40001
6 1 Retainer - Cable Top E8251-40007
7 1 Cable, LB Output to Amp Filter Board, 2 piece, Bottom E8251-20488
8 1 Cable, LB Output to Amp Filter Board, 2 piece, Top E8251-20489
9 1 A43, Assy, Amp Filter BD E8251-60633
10 1 Installation Note, UNY Upgrade Kit E8251-90396
11 1 Entitlement Certificate n/a

Installation Note E8251-90396 5
Safety Considerations
WARNING Before you disassemble the signal generator, turn the power switch off and
unplug the power cord. Failure to unplug the signal generator can result in
personal injury.
CAUTION Electrostatic discharge (ESD) can damage or destroy electronic components.
All work on electronic assemblies should be performed at a static-safe
workstation.
Check Signal Generator Functionality
Use the following procedure to confirm that the signal generator powers up and the internal
check identifies no errors. The internal check evaluates the operation of the signal generator
and returns an error message if it detects a problem.
NOTE When the signal generator is first connected to ac line power, the error
message ERROR 514, Reference Oven Cold occurs, which causes both
the OVEN COLD annunciator and the ERR annunciator to turn on.
After approximately five minutes, the OVEN COLD annunciator automatically
clears, but the ERR annunciator remains on until all errors are cleared from
the error queue.
1. Turn on the signal generator and let it warm up for at least five minutes.
2. Run the signal generator self-test by pressing
Utility > Instrument Info/Help Mode > Self Test
> Run Complete Self Test
. Upon completion, a summary of the self-test will be displayed.
Use the E8257D/67D, E8663D PSG Service Guide, E8251-90359, to troubleshoot any
failures detected by the test.
NOTE Some circuits may require up to 50 minutes to warm up before passing the
self-test. If self-tests continue to fail after 50 minutes of warm up,
troubleshoot the instrument.
3. Check to see if the ERR annunciator is on.
• If the ERR annunciator is on, review the error messages in the error queue by pressing
Utility > Error Info . The first page of error messages in the error queue appears in the
display text area. (Refer to the signal generator error messages document for
information about each error message.)
After resolving all problems causing errors, press
Clear Error Queue(s) .
• If the ERR annunciator is off, the signal generator functionality check has passed.

6Installation Note E8251-90396
Check Firmware Version and Upgrade if <C.06.15
1. Press
Utility > Instrument Info/Help Mode > Diagnostic Info .
2. Find the firmware information.
3. If the version of firmware is <C.06.15, upgrade the firmware.
Remove the Outer and Inner Signal Generator Covers
Remove the Outer Cover
Refer to Figure 1.
1. Disconnect the power cord.
2. Using a T-20 driver, loosen the two screws (1) and remove the strap handle (2).
3. Using a T-15 driver, remove the center screws (3) on the four rear-panel feet (4).
4. Remove the four bottom feet (5) from the cover by lifting the tab and sliding the foot toward
the tab.
5. Place the signal generator on its side.
6. Tilt the signal generator forward and slide the outer cover (6) back to remove it from the
frame.
Remove the Inner Top Cover
Refer to Figure 2.
1. Using a T-10 driver, remove the screws (1) from the inner-top cover (2). There are twelve
screws for E8257D/E8663D and eleven screws for E8267D.
2. Remove the inner-top cover.

Installation Note E8251-90396 7
Figure 1 Outer Cover Removal

8Installation Note E8251-90396
Figure 2 Inner Top Cover Removal

Installation Note E8251-90396 9
Remove the A32 10 MHz Crystal Oscillator
Refer to Figure 3 for this procedure.
1. Position the signal generator with the rear panel facing you.
2. Using the needle-nose pliers, disconnect the W47 flexible cable (A31 Motherboard J1041)
from A32J2.
3. Using the needle-nose pliers, disconnect the W48 flexible cable (10 MHz EFC) from A32J1.
4. Disconnect the A32W1 bias cable from the A21 Rear Panel Interface P2.
5. Using the T-10 driver, remove the three screws (3) that attach the A32 10 MHz Crystal
Oscillator to the rear panel.
6. Remove the A32 10 MHz Crystal Oscillator.
Install the A32 10 MHz Crystal Oscillator
NOTE W47 may be shipped disconnected from the A32 10 MHz Crystal Oscillator. If
it is disconnected, connect one end of the cable to A32J2 before you start
the installation procedure.
Refer to Figure 3.
1. Position the signal generator with the rear panel facing you.
2. Using a T-10 driver, install the three screws (3) to secure the A32 10 MHz Crystal Oscillator
to the rear panel.
3. Connect the A32W1 bias cable to the A21 Rear Panel Interface Board, A21P2.
4. Using the needle-nose pliers, connect the W48 flexible cable from 10 MHz EFC (rear panel
connector) to A32J1.
5. Using the needle-nose pliers, connect the W47 flexible cable to J1041 of the A31
Motherboard.

10 Installation Note E8251-90396
Figure 3 A32 10 MHz Crystal Oscillator
A32 A21P2 A47A32W1 A48
a.Used only on E8267D with serial prefix <US4824/MY4824 and all E8257D.