© Keysight Technologies 2015-2016
Modification Recommended Service Note
Version 1.2 | April 25, 2016| Page 2 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
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
(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.
