Performance Verification; Introduction; Required Materials; Performance Tests - Mallinckrodt Nellcor N-20 Service Manual

3 PERFORMANCE VERIFICATION

3.1 Introduction

3.2 Required Materials

3.3 Performance Tests

Caution: Adhere to all testing instructions; failure to do so may damage the N-20/N-20P.
3.1 Introduction
This section describes performance verification for the N-20 and N-20P pulse oximeters (hereafter
called the "monitor"), following repairs. The N-20/N-20P are powered by alkaline batteries. The
N-20/N-20P design includes built-in electrical insulation; no ground resistance or electromagnetic
leakage testing is required.
The tests can be performed without removing the monitor cover. If the monitor fails to perform as
specified in any test, repairs must correct the discrepancy before the monitor is returned to the user.
3.2 Required Materials
Durasensor
Tester, Pulse Oximeter
3.3 Performance Tests
The N-20/N-20P will operate in conjunction with the Nellcor® pulse oximetry tester, model SRC-2,
to test instrument performance. The SRC-2 plugs into the DB-9 sensor connector and uses the
instrument's power supply and diagnostic software to test the display and the operation of the
instrument. Refer to the operator's manuals for the SRC-2 for details on performance testing with the
SRC-2.
Other tests, which are outlined below, include the display backlight test, the low battery indicator test,
the power-up self-test, and the thermal printer test (printer test applies only to N-20P).
3.3.1 Backlight Test
The electroluminescent backlight illuminates the display in three sections: (1) the main section, i.e.,
the Oxygen Saturation and Pulse Rate display fields, and the 14-segment pulse rate amplitude
indicator; (2) the Low Battery indicator, and (3) Pulse Search indicators each have their own
backlight. All backlights flash once during Power-On Self-Test.
The ambient light detector is located underneath a small circular window in the top right corner of the
N-20/N-20P display. Under low light conditions, the main section backlight is switched on. If a Low
Battery and Pulse Search indicator are lit, the monitor's backlight is also lit.
To test for proper operation of the display backlight, observe the N-20/N-20P in a darkened room. If
any backlight section is not working correctly, contact Mallinckrodt's Technical Services Department
or Mallinckrodt's local representative for assistance.
3.3.2 Battery Performance
This test is provided to verify that the monitor will operate for the period specified.
The monitor is specified to operate on battery power as follows:
Nellcor DS-100A
Nellcor SRC-2
3-1