SIGNA™ Hero 3.0T Service Methods
5852800-8EN Revision 1.0
Object ID: 00000018WIA304A9D30GYZ
Topic ID: id_2012850 Version: 5.1
Date: Jul 13, 2021 4:05:17 PM

Dummy load resistance check and setup

About this task

DANGER

Fatal electric shock hazard

The RF amplifier is not disabled.

To prevent fatal electric shock, make sure the RF amplifier is disabled while configuring the calibration tools.

Procedure

Use a DVM to measure the resistance of input to the dummy load.

Measure directly on the dummy load input connector – center pin to GND.

Figure 1. Measure dummy load input resistance

Make sure that the resistance measures 50Ω ± 5Ω.

Notice

Possible calibration failure

If the dummy load is out of specification, the calibration will fail. Do not proceed with the RF amplifier output calibration. Return the RF kit for repair.

Make sure that the resistance measures 50Ω ± 5Ω.

Do the dummy load setup. Plug the fan for the dummy load into a service outlet. Never use this dummy load without its fan running.

Notice

Possible equipment damage

The dummy load must be cooled or it can overheat and become damaged.

Do not apply RF power to the dummy load when its fan is not on.