• Discovery MR750 3.0T System Service Methods
  • 5690009-2EN Revision 4
  • Object ID: 00000018WIA300C6410GYZ
  • Topic ID: id_2004447 Version: 7.0
  • Date: Feb 22, 2021 2:30:11 AM

Using Dale 601/601E 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. Verify that the test load selector switch is set at 601 for IEC601.1.
    Figure 3. Test load selector switch setting
  4. Connect the ECG leads to the Dale 601/601E [not all systems have the Cardiac {C} lead].
    Figure 4. Dale 601/601E Analyzer: connecting leads
  5. Place the L2 (Neutral) switch in the CLOSED position.
    Figure 5. Dale 601/601E Safety Analyzer
  6. Note: Be sure to pause in the OFF (middle) position when switching polarity from normal to reverse.
    Place the Outlet (Polarity) switch in the NORMAL position.
  7. On the Dale 601/601E, set the Function switch to PATIENT LEAD LEAKAGE.
  8. Move the lead switch through the lead 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 Patient Lead Leakage (lead-to-ground) and the Patient Aux Current (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. Lead Positions
    Lead select position
    RL
    RA
    LA
    LL
  9. On the Dale 601/601E, set the main selector switch to PATIENT AUX CURRENT.
  10. Move the lead switch through the lead positions shown in Table 1. Verify that the leakage current displayed on the meter is less than 50 microamps and record the values in the data sheet.
  11. On the Dale 601/601E, set the main selector switch to M.A.P. (Mains on Applied Parts sink current).
  12. Make sure that the leads are not touching the floor.
  13. Move the lead switch to measure All Leads, which is the sixth position all the way to right on the switch.
  14. On the LIFT/Ground/MAP switch, press and hold M.A.P. Make sure the leakage current displayed on the meter is less than 50 microamps and record the values on the data sheet.
  15. Note: Be sure to pause in the OFF (middle) position when switching polarity from normal to reverse.
    Repeat steps Step 7 - Step 14 with the polarity switch in the REVERSED position.