SIGNA MR355 / SIGNA MR360
Service Manual
5856356-3EN Revision 5.0
Basic Service Documentation. Copyright General Electric Company.
Object ID: 00000018WIA308ACF20GYZ
Topic ID: id_13106989 Version: 1.10
Date: Jul 5, 2019 11:49:11 PM

Universal Power Monitor - Body Setup and Calibration

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	30 minutes	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
25 KW 30 dB Attenuator (Dummy Load)	1	-	46317724p14	-
50 Ohm Terminator	1	-	46-265874p1	-
7/16Male -N Female Adapter (Attached in System Cabinet)	1	-	5166139	-

Table 3. Safety

DANGER

FATAL ELECTRIC SHOCK HAZARD!!

Live voltages throughout the cabinet when energized.

TO PREVENT FATAL ELECTRIC SHOCK, MAKE SURE THE RF AMPLIFIER IS DISABLED WHEN CONFIGURING THE CALIBRATION TOOLS.

About this task

This procedure sets up the Universal Power Monitors (UPM’s) in Body Mode, by using the system and the Power Measurement Kit (Wattmeter). For proper calibration of the Universal Power Monitors, (UPM) Forward Power must be completed in Body mode.

BODY FORWARD POWER CALIBRATION

Procedure

Remove Cabinet front cove. See SC Cover Removal.
Inhibit TR faults. Disable the Driver Module in the System Cabinet, Figure 1. Move switch 2 to the TR Disable position.

Figure 1. Driver Module Switches
Place the RF ENABLE switch on front of exciter in the DISABLE (Down) position.
Remove the Body RF cable from J4. Connect the RF dummy load into J4. Use 7/16 Male - N Female Adapter attached in System Cabinet.

Note:
If the body section of the 1.5T SRFD3 Max Power RF Output and Calibration procedure was just completed, configuration is the same. You can leave the head RF cable disconnected and body 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 2
Figure 2. Built In Service Tool

Figure 3. Plug the Dummy Load into J4, Body Out
Place the RF ENABLE switch in the ENABLE (Up) position.

Setting up Software Tool to Calibrate UPM - Body Forward Power

About this task

This tool must see a Landmark only. It is not necessary to have a Head coil in place, or any other scan parameter entered than what is described below. Simply Landmark on the cradle where the Head coil would be.

Procedure

Notice

If Head UPM is already calibrated before Body UPM Calibration, DO NOT edit '/w/config/Upm1Cal.cfg' and '/w/config/Upm2Cal.cfg'. Calibrated value of Head UPM will be erased.

If Head UPM is NOT calibrated before Body UPM Calibration, reset “/w/config/UPM1Cal.cfg” and “/w/config/UPM2Cal.cfg” file to 0 according to the following procedure.

Open File Editor by selecting Utility/File Editor from Common Service Desktop.

Figure 4. File Editor
Select File/Open.

Figure 5. File/Open
Select '/w/config/Upm1Cal.cfg' and Open.

Figure 6. Select file
Select Save As... and save the file as 'Upm1Cal.cfg.bk' .

Note:
The purpose of this step is creating backup file.

Figure 7. Save As
Select File/Open.

Figure 8. File/Open
Select '/w/config/Upm1Cal.cfg' and Open.

Figure 9. Select file
Edit the file so that the 12 values are set to '0'.

Figure 10. Edit
Save the config file.

Figure 11. Save
Perform the same procedure for '/w/config/Upm2Cal.cfg'.
Quit the tool.
Perform [TPS Reset].

Note:
This tool must see a Landmark only. It is not necessary to have a Head coil in place, or any other scan parameter entered than what is described below. Simply Landmark on the cradle where the Head coil would be.

Click New Patient Icon.
Enter the following parameters:
1. geservice
2. Weight: 111
Press the Align button on, (Land Mark).
Move the cradle to the Home position and then drive it into the bore.
Press Landmark button when the align light is approximately where the center of the head coil would be.
From the Common Service Desktop Select:
1. Select Calibration Tab
2. Select UPM Tool
3. Start UPM tool from the Service Browser, Figure 12. Figure 13 shows an example of the UPM tool.
  
  Figure 12. Starting UPM Tool
  
  Figure 13. UPM 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.
Select the Nuclei 1H.
Select the RF Chain you are going to calibrate Body.
Select Power Monitor type. Forward
Select: Calibrate Button
Select the Start button on the tool opened earlier, Figure 13.

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

Place the RF ENABLE switch on front of exciter in the DISABLE (Down) position.
Remove the cables and power measurement equipment.
Re-enable T/R Drive. See Driver Module, Figure 1.
Switch RF ENable on the front of the exciter to the Enable (up) position.
Upon completion of UPM calibration, Reset TPS. The system will not scan until this step is done