Keysight Technologies U1251B Guida rapida

ADMINISTRATIVE INFORMATION

ACTION [X] ON SPECIFIED FAILURE

CATEGORY: [[]] AGREEABLE TIME

STANDARDS

LABOR: 0.1 Hours

LOCATION [X] CUSTOMER INSTALLABLE

CATEGORY: [[]] ON-SITE (active On-site contract required)

[[]] SERVICE CENTER

[[]] CHANNEL PARTNERS

SERVICE: [[]] RETURN

INVENTORY: [[]] SCRAP

[x] SEE TEXT

USED [[]] RETURN

PARTS: [[]] SCRAP

[x] SEE TEXT

AVAILABILITY: PRODUCT’S SUPPORT LIFE

NO CHARGE AVAILABLE UNTIL: 20 April 2017

[[]] Calibration Required

[X] Calibration NOT Required

PRODUCT LINE: WC

AUTHOR: SJ

ADDITIONAL INFORMATION:

Modification Recommended Service Note

Version 1.2 | April 25, 2016| Page 1of 3

Modification Recommended

Service Note

U1251B-06

U1251B Handheld Digit Multimeter

Serial Numbers: “See Appendix (A)"

The Problem –Capacitance measurement may be out of specification at 100nF range and below.

Parts Required:

P/N Description Qty.

Pomona 2BC-36 double banana plug both ends cable assembly

Supersedes:

NONE

Modification Recommended Service Note

Version 1.2 | April 25, 2016| Page 2of 3

Situation:

U1251B within the serial number range may not meet the specification for capacitance

measurement in 100nF range and below. This is due to improper open adjustment performed at

factory which the cable has been used to perform the open adjustment, has caused a negative

offset stored in the multimeter’s memory.

Solution/Action:

To verify whether the multimeter is impacted with capacitance measurement in 100nF range and

below:

1. Turn the knob to the Capacitance measurement position.

2. Manual set the range to 10 nF range.

3. Plug in one end of the Pomono 2BC-36 cable assembly across the capacitance measurement

terminal, leave the other end of the cable assembly open.

4. The U1251B should read between 0.8nF to 1.1nF, otherwise the “Open” calibration adjustment

was performed incorrectly.

To correct the multimeter capacitance measurement in 100nF range and below:

5. Unplug any cable from the multimeter’s terminal.

6. By referring to the service guide procedure,

(http://literature.cdn.keysight.com/litweb/pdf/U1251-90036.pdf ), unsecure the meter to enter

into the calibration adjustment mode.

7. Turn the knob to the Capacitance measurement position.

8. Perform ONLY the “Open” adjustment in Capacitance measurement without any cable

connected to the multimeter.

9. Exit calibration adjustment mode after the “Open” adjustment is done.

10. Verify the “Open” adjustment has been performed correctly by repeating step 1 to step 4.

Customers who have purchased the U1251B Multimeter within the serial number range stated in this

service note will receive a complementary Pomona 2BC-36 cable assembly.

Each customer is entitled to one free Pomona 2BC-36 cable assembly.

To request a free Pomona 2BC-36 cable assembly, please click HERE

(http://www.keysight.com/find/pomona2BCcablerequest) and provide the following information on the

web form:

1. Instrument Model Number

2. Serial Number

3. Name of distributor who sold this unit

4. Date of purchase

5. Delivery details:

Modification Recommended Service Note

Version 1.2 | April 25, 2016| Page 3of 3

Receiver’s Name

Receiver’s Address

Receiver’s Telephone number

Keysight will arrange for the shipment of the free Pomona 2BC-36 cable assembly to the customer.

Revision History:

Date

Service

Note

Revision

Author

Reason for Change

20 April 2016

As Published

Appendix (A):

MY54040020

MY54120105

MY54300038

MY54400012

MY54040047

MY54120113

MY54300039

MY54400018

MY54050005

MY54130129

MY54300045

MY54400023

MY54050065

MY54130135

MY54320012

MY54400024

MY54080005

MY54130166

MY54320033

MY54400025

MY54080018

MY54130169

MY54320040

MY54080068

MY54270015

MY54320044

MY54100004

MY54300015

MY54320050

MY54100028

MY54300019

MY54320051

MY54120102

MY54300035

MY54370004

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