Table 4-2: A/D Channel Designators - Mallinckrodt NELLCOR NPB-4000 Service Manual

4.3.3 System A/D Values
• System Software Version: Displays the revision level of the system
software. The revision level is also momentarily shown on the LCD as part
of the Copyright screen. This value may not be changed by the user.
• SpO
Software Version: Displays the revision level of the software of the
2
MP-205 SpO module. This value may not be changed by the user.
2
When in the System Information screen, the knob may be rotated to select any of
the "changeable" items. If one of those items is selected, a press of the knob will
cause a pop-up menu to appear. The first item in the pop-up will read "Make no
change"; the second item in the pop-up will read "Reset to zero". Exiting the
screen is accomplished in the normal manner, by selecting "Return".
This screen displays the current value of each analog-to-digital (A/D) channel, in
volts. Some of the channels are for AC-coupled signals (such as ECG input), so
the numbers on the screen will be constantly changing when an input signal is
present. These AC-coupled values are shown to give an indication as to whether
basic functionality of the channel is present, but no significance can be derived
from the values of the numbers displayed. However, others of the A/D channels
read DC voltages, (for example, power supply voltages and battery voltage)
those voltage values directly provide useful diagnostic information.
The Primary and Secondary Status messages from the SpO
displayed and updated at the rate of about once per second. Presence of the
correct SpO message indicates that, at a basic level, communication between
2
the SpO module and the main monitor processor is working correctly. None of
2
the displayed values may be changed or reset in this screen.
When in the System A/D screen, the "Return" item is always highlighted; a press
of the knob will return the user to the Diagnostic Menu. Rotating the knob while
in the System A/D screen will have no effect. The A/D channel designators are
shown in Table 4-2.

Table 4-2: A/D Channel Designators

A/D CHANNEL DESIGNATOR
1. ECG
2. RWAVE
3. PACEMAKER
4. RESPIRATION
5. PRESSURE XDUCER 1
6. PRESSURE XDUCER 2
7. NIBP OSCILLATORY
8. ECG LEADS OFF
9. TEMERATURE
10. ISOLATED VOLTAGE REF
11. ISOLATED VOLTAGE ZERO
SpO S1 S018
2
Section 4: Power-up Defaults Menu and Diagnostic Mode
A/D CHANNEL DESIGNATOR
12. (BATTERY VOLTAGE) X 0.5
13. not used
14. +3.3VDC POWER SUPPLY
15. (+12VDC POWER SUPPLY) X
0.33
16. (NIBP VOLTAGE REF) X 0.8
17. GROUND REFERENCE
18. (+5 VDC POWER SUPPLY) X 0.8
19. ADC MID-SCALE VALUE
20. ADC FULL-SCALE VALUE
21. ADC ZERO-SCALL VALUE
SpO
module will be
2
S2 S010
2
4-5