• SIGNA™ Hero 3.0T Service Methods
  • 5852800-8EN Revision 1.0
  • Object ID: 00000018WIA30121E20GYZ
  • Topic ID: id_13105972 Version: 3.0
  • Date: Aug 29, 2019 1:39:51 AM

Agilent Wattmeter and Power Adjustment Kit for RF Head Calibration

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1Not ApplicablePart of parent procedure minutesNot Applicable

Procedure

  1. Use a digital multimeter to measure the resistance between the dummy load RF connector center pin and the shield. Confirm a reading of 50 ohms (+/- 5 ohms). Replace the dummy load if the resistance is out of range.
  2. Before setting up the wattmeter and dummy load for head mode, verify that the scanner is idle. Confirm that the RF ENB switch on the DTX1 exciter is in the Disable (down) position.
  3. Setup the hardware per following steps.
    1. Disconnect the head output cable from J3 on the front of the RF amplifier.
    2. Connect the input of the coupler to J3 on the RF amplifier.
    Figure 1. Setup hardware
  4. Connect the remaining Agilent power components as shown below.
    Figure 2. Agilent Wattmeter Setup for RF Power Output for Head
    1RF amplifier (front) 6RF cable to dummy load
    2RF output port 7RF coupler
    3Wattmeter 8Agilent 50 ohm terminator connected to the Reflected port on the coupler
    4Agilent sensor probe cable 9RF adapter
    5RF sensor connected to the Incident port on the coupler 10Dummy load with internal fans
  5. Connect one end of the RF sensor to the wattmeter. Connect the other end to the coupler.
  6. Plug the fan for the dummy load into a service outlet in the ISC. Never use this dummy load without its fan running.

Finalization

No finalization steps.