GE b30, Technical Reference Manual

Page: 103 / 252

Adjustments and calibrations
3-33
Document no. 2044677-001
Table 5 NIBP calibration check pressures
If the error of pressure channel B1 is larger than specified above, the module should be
recalibrated. The error of B2 is allowed to be even twice as large because it has no effect on
blood pressure measurement accuracy. However, we recommend recalibrating the module
when the error of B2 is larger than specified above to ensure best possible operation.
Calibration
1. Enter Calibration menu.
2. Remove the hoses from the front panel connector to enable proper zeroing.
3. Select Calibration . If it is not available, perform the steps a, b, and c.
NOTE: Do not pull out the hemodynamic module from the monitor frame. The module must be
in the frame during the whole procedure.
a.
Press the hemodynamic module buttons
Auto ON/OFF
and
Start Cancel
simultaneously for 3 seconds to enable the calibration. This enables menu selection
Protection .
b. Select Protection OFF in the Calibration menu and push the ComWheel.
c. Menu selection Calibration is now enabled, and Protection is disabled.
•
Start calibration by pushing the ComWheel. Messages ‘Zeroing’ and ‘Zeroed’ will be
displayed in the NIBP message field. After this, a pressure bar and text ‘Calibrating’ will be
displayed.
•
Connect an external mercury manometer with a pump to the module through the both
tubes of the hose - both transducers B1 and B2 must be calibrated simultaneously. Pump
up to a pressure of about 200 mmHg according to the manometer. Calibration is possible
in the range of 150 to 250 mmHg.
•
Verify that both pressure values in the prompt field match the manometer reading. If not,
adjust by turning the ComWheel. When the values of the pressure bar and the
manometer are equal, push the ComWheel to confirm the calibration. The message
‘Calibrated’ will be displayed on the NIBP digit field after a few seconds, which means that
the calibration succeeded, and the new calibration data is saved in EEPROM.
NOTE: When calibrating NIBP, always change the displayed pressure value slightly with the
ComWheel, even in cases where the value would be correct. For example, change the value
one step higher and then back one step lower. ‘Calibrated’ text should appear in the display.
This ensures that the calibration procedure is correctly registered and stored by the module.
•
To set the protection on:
Select
Protection ON and push the ComWheel. Then press NIBP module buttons
Auto
ON/OFF
and
Start Cancel
simultaneously for 3 seconds.
•
Remove the module from the frame and plug it back again. Then perform “Calibration
check” (see the preceding page) to verify the new calibration.
Pressure Max. error Example
0 mmHg ±5 mmHg (=zero offset) -1
100 mmHg 100 ±2 mmHg 100 ±2
200 mmHg 200 ±3 mmHg 200 ±3