• SIGNA MR355 / SIGNA MR360
  • Service Manual
  • 5856356-3EN Revision 5.0
  • Basic Service Documentation. Copyright General Electric Company.
  • Object ID: 00000018WIA304ACF20GYZ
  • Topic ID: id_13106990 Version: 1.8
  • Date: Jul 5, 2019 10:46:05 PM

Universal Power Monitor - Head Setup and Calibration

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1Not Applicable30 minutesNot Applicable
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
50 Ohm 200 WATT, 30 dB Attenuator (Dummy Load)1-

46-317724p14

-
Table 3. Safety

About this task

HEAD FORWARD POWER CALIBRATION

Procedure

  1. Remove the Cabinet Front Cover. See SC Cover Removal.
  2. If Body UPM is NOT calibrated before Head UPM Calibration, reset “ /w/config/UPM1Cal.cfg” and “ /w/config/UPM2Cal.cfg” file to 0 according to the following procedure.
    1. Open File Editor by selecting Utility/File Editor from Common Service Desktop.
      Figure 1. File Editor
    2. Select File/Open.
      Figure 2. File/Open
    3. Select '/w/config/Upm1Cal.cfg' and Open.
      Figure 3. Select file
    4. Select Save As... and save the file as 'Upm1Cal.cfg.bk' .
      Figure 4. Save As
    5. Select File/Open.
      Figure 5. File/Open
    6. Select '/w/config/Upm1Cal.cfg' and Open.
      Figure 6. Select file
    7. Edit the file so that the 12 values are set to '0'.
      Figure 7. Edit
    8. Save the config file.
      Figure 8. Save
    9. Perform the same procedure for '/w/config/Upm2Cal.cfg'.
    10. Quit the tool.
    11. Perform [TPS Reset].
  3. Inhibit TR faults. The Driver Module in the System Cabinet, Figure 9. Move switch 2 to the TR Disable position.
    Figure 9. Driver Module Front Switches
  4. Place the RF ENABLE switch on front of exciter in the DISABLE (Down) position.
  5. Remove the head heliax able from J3 at the back of the RF Amplifier and connect it directly to the RF dummy load. Figure 11.
    Note:

    If the Head RF power out procedure was just completed, configuration is the same. You can leave the Body RF heliax cable disconnected and the head output can keep the wattmeter in line. It will not change the outcome of the calibration.

    Note:
    7/16Male -N Female Adapter is located at System Cabinet Left Shelf. Remove left cover and find it. See Figure 10
    Figure 10. Built In Service Tool
    Figure 11. Setup for Head Output Measurement

Setting up Software Tool to Calibrate UPM – Head Forward Power

Procedure

  1. Click New Patient Icon.
  2. Enter the following parameters:
    1. Patient ID: geservice
    2. Weight: 111
  3. Withdraw the Cradle from its previous position.
  4. Place the head coil on the cradle and plug the coil connector.
  5. Insert the Head Sphere and Loader into the Head coil as shown in Figure 12.
  6. Press Align on.
  7. Place the laser alignment light on the center of the Phantom in the Head coil. Refer toFigure 12.
    Figure 12. Landmarking the Head Coil
  8. Press Landmark
  9. Press Advance to Scan
  10. From the Common Service Desktop Select:
    1. Select Calibration Tab
    2. Select UPM Tool. Figure 13.
      Figure 13. Starting UPM Tool
    3. Select Hyper Link to start UPM tool. See Figure 14.
      Figure 14. UPM Monitor Tool GUI
      Note:

      The first time running the UPM Calibration tool after a load from cold, the following Error may appear: “The spectroRFampType and upm.config do not match! Please run the UPM Tool config file editor and hit [Restore Defaults] and save the config file”. If this error appears, click [File] -> “Edit Config”. When the window opens, click [Restore Defaults] then close the screen. The tool will now have the correct information and this pop-up will not appear again during future UPM Calibrations.

  11. Select the Nuclei 1H.
  12. Select the RF Chain you are going to calibrate Head.
  13. Select Power Monitor type. Forward.
  14. Select: Calibrate Button
  15. Select Start button.

    One window popup to ask you if the hardware setup properly. Click [ok].

  16. Status should indicate Pass/Fail from 1 minute to 7.5 minutes depending on software version (tool should notify user of current step in progress). If Failure occurs, see Universal Power Monitor (UPM) Troubleshooting.

Finalization

Procedure

  1. Place the RF ENABLE switch on front of exciter in the DISABLE (Down) position.
  2. Remove the cables and power measurement equipment.
  3. Reattach the Head and Body Heliax Cables.
  4. Re-enable T/R Drive. See Figure 9.
  5. Switch RF ENable on the front of the exciter to the Enable (up) position.
  6. Upon completion of any UPM calibration, Reset TPS. The system will not scan until this step is complete.