• SIGNA™ Hero 3.0T Service Methods
  • 5852800-8EN Revision 1.0
  • Object ID: 00000018WIA30011E20GYZ
  • Topic ID: id_13106416 Version: 6.0
  • Date: Feb 21, 2021 9:07:59 PM

UPM Calibration and UPM Functional Check–Body Mode

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1 -30 minutes (plus 30 minutes for Agilent wattmeter power up)5 minutes
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
Medium Phillips screwdriver1---
12 inch crescent wrench1---
RF power measurement kit (one of the following options):1-

EITHER 5307511-2 or 5307511-3 (Bird wattmeter)

BOTH 5434817 (Agilent wattmeter) and 5434817-20 (dummy load)

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Table 3. Safety
Table 4. Required conditions
ConditionReferenceEffectivity

When using the Agilent wattmeter, plug in the wattmeter and turn it on. The wattmeter must be powered for at least 30 minutes for stable and accurate readings.

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About this task

This procedure covers the set up and execution of the UPM calibration and UPM functional check for body mode. These procedures must be performed in sequence:

  • The UPM calibration adjusts digital attenuator values internal to the UPM to match the expected RF signal levels.

    Calibration is performed for forward power and reflected power for body channel 1 and body channel 2.

  • 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.

Table 5. Calibration Steps
Calibration Steps
Safety
Body 1 Disabling T/R, DD, and RF Input for Body Mode
Hardware Setup for RF Body 1 Calibration
Calibrating UPM Reflected Power for Body Channel 1
UPM Functional Check for Body Channel1
Body 2 Setting up and Calibrating UPM Forward Power for Body Channel 2
Calibrating Reflected Power for Body Channel 2
UPM Functional Check for Body Channel 2
Finalization

If you are performing an initial installation and need to calibrate the RF amplifier, calibrate the UPMs, and check the UPMs, use the procedures in RF Amplifier and UPM Calibration.

Topic ID: id_SL5486304-1213180

Disabling T/R, DD, and RF Input for Body Mode

Procedure

  1. (For Agilent wattmete) Plug in the wattmeter and turn it on. The wattmeter must be powered for at least 30 minutes for stable and accurate readings.
  2. Verify that the system is idle and all coils have been removed from the magnet bore.
  3. Note: This tool must see a landmark only. It is not necessary to have a body phantom in place or any other scan parameter entered other than what is described below. Simply landmark on the cradle where the body phantom would be.
    Open the front door of the ISC.
  4. Set Driver Module and Exciter switch per following steps.
    1. On the front of the driver module, set SW2 to TR DISABLE (down) and set SW3 to DD DISABLE (down).
      Note: Leave HV set to ENABLE.
    2. Set the RF Enable switch on the exciter to DISABLE (down).
    Figure 1. Driver Module and Exciter switch setup
Topic ID: id_SL13658149-1213180

Calibrating UPM Forward Power for Body Channel 1

Procedure

  1. Set RF ENB to ENABLE (up).
    Figure 2. Exciter switch
  2. Press Landmark. Then, advance to scan. A phantom is not needed.
    Figure 3. Adv to scan
  3. (For non-proprietary mode) On the Common Service Desktop, select Calibration > UPM Tool and select Click here to start this tool.
  4. Make the following selections for the settings.
    Figure 4. UPM Calibration Settings
    For this setting: Select:
    Nuclei 1H
    Task Calibrate UPM
    RF Chain Body Channel 1
    Power Type Forward
  5. Select Start.
  6. Select Yes when the prompt asks if the hardware setup is correct.

    After approximately one minute, you are asked to confirm the peak power value output from the amplifier.

    If the power read from the power meter is within specification, click Yes. Otherwise, click No and recheck the calibration of the RF amplifier.

  7. The tool reports the steps as they progress. In about three minutes, the Status field on the UPM Tool displays PASS or FAIL.

    A popup appears reminding you to run reflected power after you have completed forward power.

Topic ID: id_SL5525136-1213180

Calibrating UPM Reflected Power for Body Channel 1

About this task

After calibrating forward power, calibrate reflected power as follows.

Procedure

  1. Disconnect the RF dummy load per following steps.
    1. Set RF ENB to DISABLE (down).
    2. Disconnect the RF dummy load from BODY RF OUT J4 for the body channel 1.
    3. Set RF ENB to ENABLE (up).
    Figure 5. Disconnect J4
  2. From the UPM Tool, make the following selections:
    Figure 6. UPM Tool Selections for Dual Drive RF Amplifiers
    For this setting: Select:
    Nuclei 1H
    Task Calibrate UPM
    RF Chain Body Channel 1
    Power Type Reflected
  3. Select Start.
  4. Select Yes when the prompt asks if the hardware setup is correct.
  5. The tool reports the steps as they progress. The Status field on the UPM Tool interface displays PASS or FAIL within about three minutes.
  6. Reconnect coupler to J4 per following steps.
    1. Set RF ENB to DISABLE (down).
    2. When the body channel is calibrated (PASS) for reflected power, reconnect the coupler to RF amplifier body channel 1 port (J4). The stub cable remains connected to J22.
    3. Set RF ENB to ENABLE (up).
    Figure 7. Reconnect Coupler to J4
  7. Proceed to UPM Functional Check for Body Channel1.
Topic ID: id_SL5525088-1213180

UPM Functional Check for Body Channel1

About this task

After completing the UPM calibration, continue with the UPM functional check.

Procedure

  1. From the UPM Tool, make the following selections:
    Figure 8. UPM Functional Check Selections for Dual Drive RF Amplifiers
    For this setting: Select:
    Nuclei 1H
    Task UPM Func Chk
    RF Chain Body Channel 1
    Note: Power Type is grayed out. This is normal and is not used.
  2. Select Start.
  3. Select Yes when the prompts ask if the hardware is set up correctly.
  4. Prompts are displayed during test execution, including a popup message about the UPM tripping and a power trip error message. The tool performs three tests before the host trip. This takes 2 to 3 minutes before any user interaction is required.

    From the CSD, open the error log. Verify the error log contains the message that the UPM has “detected a power fault on Body Short Term Average.” Select Yes if an error message is displayed.

    Figure 9. UPM Power Trip Error Log
  5. After completing the calibration and check of the body channel 1, proceed to calibrating the RF amplifier for body channel 2. See Setting up and Calibrating UPM Forward Power for Body Channel 2.
Topic ID: id_SL5525236-1213180

Setting up and Calibrating UPM Forward Power for Body Channel 2

Procedure

  1. Setup hardware per following steps.
    1. Set RF Enable to DISABLE (down).
    2. Disconnect the 3/16-Wavelength Cable Stub from the RF amplifier channel 2 body port (J22) and set aside.
    3. Disconnect the body input BNC cable J14 (for body channel 1) from the RF amplifier and set aside.
    4. Disconnect input of coupler from J4 and attach the 3/16-Wavelength Cable Stub to the body channel output J4.

      This arrangement should remain in place during RF calibration, UPM calibration and UPM functional check for body channel 2 ONLY.

    5. Connect the input of the coupler to J22 on the RF amplifier.
    6. Reconnect the body channel 2 BNC input cable with cable labeled “J21” to BNC port J21 on the front of the RF amplifier.

      Confirm that the power meter is set up as it was for the body channel 1 procedure.

    7. Set RF ENB to ENABLE (up).
    Figure 10. Hardware Setup for RF Body 2 Calibration
  2. On the UPM Tool, make the following selections:
    Figure 11. Body Mode (Channel 2) Settings
    Settings Value
    Nuclei 1H
    Task Calibrate UPM
    RF Chain Body Channel 2
    Power Type Forward
  3. Select Start.
  4. Select Yes when the prompt asks if the hardware set up is correct.

    After approximately one minute, you are asked to confirm the peak power value output from the amplifier.

    If the power read from the power meter is within specification, click Yes. Otherwise, click No and recheck the calibration of the RF amplifier.

  5. The tool reports the steps as they progress. In about 3 minutes, the Status field on the UPM Tool displays PASS or FAIL.
Topic ID: id_SL5525329-1213180

Calibrating Reflected Power for Body Channel 2

About this task

After calibrating forward power, calibrate reflected power as follows.

Procedure

  1. Setup hardware per following steps.
    1. Set RF Enable to DISABLE (down).
    2. Disconnect the RF coupler from BODY RF OUT J22 and set it aside. This part of calibration is performed with no connection to this port. The stub cable on J4 remains connected.
    3. Set RF Enable to ENABLE (up).
    Figure 12. Disconnect J22
  2. On the UPM Tool, make the following selections:
    Figure 13. UPM Functional Check Selections for Body Channel 2 Reflected
    Settings Value
    Nuclei 1H
    Task Calibrate UPM
    RF Chain Body Channel 2
    Power Type Reflected
  3. Select Start.
  4. Select Yes when the prompt asks if the hardware set up is correct.
  5. When body channel 2 is calibrated (PASS) for reflected power, return the cable configuration to support testing for forward power:
    1. Set RF Enable to DISABLE (down).
    2. On the front of the RF amplifier, reconnect the RF coupler to BODY RF OUT J22.
    3. Set RF Enable to ENABLE (up).
    Figure 14. Reconnect J22
Topic ID: id_SL5525347-1213180

UPM Functional Check for Body Channel 2

Procedure

  1. On the UPM Tool, make the following selections:
    Figure 15. UPM Functional Check Selections for Body Channel 2
    For this setting: Select:
    Nuclei 1H
    Task UPM Func Chk
    RF Chain Body Channel 2
    Note: Power Type is grayed out. This is normal and is not used.
  2. Select Start.
  3. Select Yes when the prompt asks if the hardware set up is correct.
  4. Prompts are displayed during test execution, including a popup message about the UPM tripping and a power trip error message. The tool performs three tests before the host trip. This takes 2 to 3 minutes before any user interaction is required.

    From the CSD, open the error log. Verify the error log contains the message that the UPM has “detected a power fault on Body Short Term Average.” Select Yes if an error message is displayed.

    Figure 16. UPM Power Trip Error Log
  5. When PASS appears on the UPM Tool interface, check that all the body channel is calibrated and checked.
  6. Restore the Body RF cables per following steps.
    1. Set RF Enable to DISABLE (down).
    2. Disconnect the 3/16-Wavelength Cable Stub from J4and set it aside. Reconnect the system body channel 1 transmit cable to RF amplifier body output channel 1 RF OUT J4.
    3. Disconnect the coupler from RF amplifier channel 2 RF OUT J22 and set it aside. Reconnect the system body channel 2 transmit cable to RF amplifier body output channel 2 RF OUT J22.
    4. Reconnect body channel 1 BNC input cable with cable labeled "J14" to BNC RF input port J14 on the front of the RF amplifier.
    5. Set RF Enable to ENABLE (up).
    Figure 17. Restore the Body RF cables
Topic ID: id_15012858

Finalization

Procedure

  1. Confirm that the other RF amplifier system cables are reconnected to their correct locations for clinical scanning.
  2. Complete a TPS reset and perform Check Scan.
  3. If all the calibrations have been successfully made, perform a SaveInfo to save the UPM calibration results.