Electronic Calibration Modules Reference Guide          1-23
General Information
Service and Recertification
Service and Recertification
If your ECal module requires service or recertification, contact the Keysight 
office nearest you for information about where to send it. The performance of 
your ECal module can only be verified by specially manufactured equipment 
and calibration standards from Keysight.
Definitions
— Service: Replacement of connectors.
— Recertification: Measure the performance of the device and provide a 
Pass/Fail. See also, “Recertification of ECal Modules” on page 1-24.
Contacting Keysight
Assistance with test and measurements needs and information on finding a 
local Keysight office are available on the Web at: 
www.keysight.com/find/assist
If you do not have access to the Internet, please contact your Keysight field 
engineer.
Returning Devices to Keysight
If you are returning the product to Keysight, please contact Keysight and 
provide the following information: 
—your company name and address
— a technical contact person within your company, and the person’s complete 
telephone number including country code and area code
— the model number and serial number of the case
N755xA, N469xD, and N443xD must be returned to factory for 
recertification and service. Refer to “Definitions”.
N7550A/1/2A are value line products and can be re-certified and serviced. 
But, because the ECal modules are so intricately constructed and because 
of the resulting cost of re-certification or minor repairs, it may not be cost 
effective to return these models to the factory.
Keysight provides a Utility that can be used to verify that your ECal module 
is performing as expected. Refer to “ECal Confidence Check – Basic 
Validation of the Calibration” on page 3-11.
In any correspondence or telephone conversation, refer to the Keysight 
product by its model number and full serial number. With this information, 
the Keysight representative can determine whether your product is still 
within its warranty period.