• SIGNA™ Hero 3.0T Service Methods
  • 5852800-8EN Revision 1.0
  • Object ID: 00000018WIA30364510GYZ
  • Topic ID: id_2004584 Version: 9.1
  • Date: Jul 13, 2021 4:05:16 PM

Doing the UPM functional check (head and body)

Do the UPM head and body functional check to make sure the measured RF power is within the expected range.

Prerequisites

Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1-20 minutes-
Tools and test equipment
ItemQuantityPart numberManufacturer
RF Power Measurement Kit1Either 5307511-2 or 5307511-3 (Bird wattmeter)-
Safety

Before working in any GE Healthcare MR suite or performing any GE Healthcare service procedure, you must:

  • Have read and understood all hazard conditions and safety requirements in the latest revision of the GE Healthcare MR Service Safety Manual (5452735).
  • Have successfully completed all relevant GE Healthcare Environmental Health and Safety (EHS) courses (or for non-GE employees, equivalent workplace training courses).
  • Comply with all site-specific training and workplace safety requirements.

If you have any safety concerns at any time, do not begin work or immediately stop work and move to a safe location. Immediately contact your supervisor or site safety officer for instructions on how to proceed.

About this task

The UPM functional check runs a prescribed scan in the forward power chain. It compares the measured RF power from the UPM to the expected value stored in the UPM configuration file. If two values are outside 12%, the functional check fails. If the measured RF power exceeds the trip limit, the UPM stops scanning.

The UPM functional check runs a prescribed scan in the reflected power chain, using the same test as forward power.

Dual drive RF amplifier systems operate in average power mode. Functional check tests include: 10-second average power check, RF inhibit test, and short-term average power fault host trip test.

Refer to Calibrating RF Amplifier and UPM for calibration information.