Keysight Technologies U1252B, U1282A Modification Recommended Service Note

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

U1252B-06

U1252B 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

ADMINISTRATIVE INFORMATION

© Keysight Technologies 2015-2016

Modification Recommended Service Note

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

Situation:
U1252B 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 U1252B 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 U1252B 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:

 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.

Modification Recommended Service Note

© Keysight Technologies 2015-2016

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