• Discovery MR750 3.0T System Service Methods
  • 5690009-2EN Revision 4
  • Object ID: 00000018WIA30FB6410GYZ
  • Topic ID: id_2004446 Version: 6.0
  • Date: Jul 19, 2019 10:55:57 AM

Using Dale 600/600E Safety Analyzer

About this task

Important: The safety analyzer must be located as far away from the magnet as possible to successfully execute this test. Getting closer to the magnet affects the safety analyzer and alters the tool’s ability to take an accurate measurement.

Procedure

  1. Plug the analyzer into a power source in the magnet room which allows access to the patient monitor accessory hook on the left side of the magnet enclosure, while staying at least 20 inches (51 cm) from the magnet.

    The patient monitor accessory hook is on the left side of the magnet, regardless of system version. The example shown below is an MR450 system.

    Figure 1. Patient monitor accessory hook location (example)
  2. At the patient monitor accessory panel, connect the patient lead cable and the cardiac lead set at the ECG connector.

    The ECG connector is round and is labeled with ECG or a heart symbol. The example shown below is an MR450w system.

    Figure 2. ECG connector (Example)
  3. Connect the cardiac leads to the Dale 600/600E (46-328406G1).
    Figure 3. Dale 600 Analyzer
  4. Place the Neutral button in the CLOSED position.
  5. Place the Polarity switch in the NORMAL position.
  6. On the Dale 600/600E, set the main selector switch to LEAKAGE - LEAD-GND.
  7. Move the LEAD switch through the positions shown in Table 1. Verify that the leakage current displayed on the meter is less than 50 microamps and record the values on the data sheet.
    Note: Typically, the lead-to-ground and lead-to-lead readings are close to zero and less than 50 microamps. Measurements exceeding 50 microamps indicate an issue in the corresponding lead.
    Table 1. Leakage Current Measurements
    Lead select position
    RL
    RA
    LA
    LL
  8. On the Dale 600/600E, set the main selector switch to LEAKAGE - LEAD-LEAD.
  9. Move LEAD switch through the positions shown in Table 1. Verify that the leakage current displayed on the meter is less than 50 microamps and record the values on the data sheet.
  10. On the Dale 600/600E, set the main selector switch to LEAKAGE - LEAD-ISO.
  11. Make sure that the leads are not touching the floor.
  12. Move the LEAD switch to ALL LEADS.
  13. Press ISO TEST and record the meter reading on the data sheet. This reading must be less than 50 microamps.
  14. Repeat steps Step 6 - Step 13 with the POLARITY switch in the REVERSED position.