Ohmeda 3000 - Analog to Digital Converter (ADC) Calibration; Line Voltage Sensing and Triac Safety Test; Test Loop Procedure

4/Calibration and Adjustments
4. Switch the power switch “On” and allow the 3. The front panel should display the following:
unit to stabilize for 5 minutes.
- ーーーー .. ~ - . . Pat. Temp... EEE
5. Verify that the ADC counts displayed on the Cont. Temp. EEE
elapsed time display is 1122 + 2 counts. Slowly Elapsed Time Running in Stop Watch Mode
adjust R44 on control board as required.
6. Input resistance values into patient probe con- 4. Confirm that the heat indicator LED on the con-
nector and verify patient temperature readings trol board is lit.
are within tolerances specified. 、 :
P 5. Use a stop watch and verify that elapsed time
Resistance Input Patient Temperature display is accurate within + 1 second per min-
5900 ohms + 0.1% (17) 37.3 + 0.1 degrees ute.
7060 ohms + 0.1% 13, 33.0 = 0.1 4.
6190 ohms + 0 1% fay) 36.2 + 0.1 degrees 6. After approximately 3 minutes and 20 seconds
4 h + 0.19 12 39.0 + 0. (60 Hz models) or approximately 4 minutes (50
5496 ohms » 62) 9.0 0.1 degrees Hz models) a warbling alarm which cannot be si-
F. Line Voltage Sensing lenced occurs.
1. Use a DVM and measure the line voltage at the 7. The heat indicator LED on the control circuit
wall outlet. board (viewed from the rear of unit) should be
2. Calculate the displayed % variance of the supply off.
voltage from the rated nominal voltage using the 8. Switch the power “Off” for the Infant Warmer
following formula: and restore the test switch to the original config-
(Actual line voltage / Nominal Voltage) x 100 = uration (all switches "Open").
Displayed % H. Test Loop
3. Slowly adjust R3 on power supply board as re- Complete Unit Testing
quired until the control temperature display 1. Switch the power “Off".
als the calculated value for th i: It:
red, catonlated value lor ine supply voltage 2. Place the test switches on the control board in
. the test loop position. All 4 switches Closed
Note: For domestic 115v units and an input vol- (“On”).
tage of 115 volts the reading on the control tem- 3. Switch th itch “On"
perature display should be 100 % + 2%. - Switch the power switc! п.
4. Switch the power switch “Off”. 4. Verify that the following sequence occurs:
G. Triac Safety Circuit Test a. For the first second:
y All segments, LEDS, and high-low alternating
1. Place the individual test switches in the follow- tone audible alarm are “On”.
ing positions b. For the next second:
、 High-low alternating tone audible alarm “On”.
Switch #1 Open (“Off”) 000 Patient display — 60H for 60 Hz (50H for 50 Hz)
Switch #2, #3, #4 Closed (“On”) Elapsed time display - software revision number.
2. Switch the Infant Warmer power “On". c. The unit should then loop in the following order
until the power is removed.
Seven Seg Bar Graph Alarm LEDs Mode LEDs Heater and
Display's Segments Lights
AN Us - - 1.11 Probe fail Servo “On"
AN 2's 2,12 Pat. temp. Servo "off"
All 3’s 3,13 Sys. fail Servo “On”
All 4’s 4,14 Heater OFF Manual “Off”
All 5’s 5,15 Reset timer Manual “On”
All 6's 6,16 Spare LED Manual “Off”
All 7's 7 7,17 Al "Off" Apgar “On”
All 3's 8,18 All "Off" Apgar “Off”
All 9's 9,19 AN “Off” Apgar "On"
All 0’s 10,20 Al "Off" All “Off" "Off"
All “Off" АП “Ой” Al "Off" All “Off” “Off”
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