Beckman Coulter Multisizer 4, User Manual

Page: 218 / 238

PN A51387A
B
9-12
Troubleshooting
Viewing Advanced Multisizer Settings
3. In the Fill, Flush and Drain Settings window, enter the new system drain time in the Drain Time
field and click
(
OK
)
.
Aperture Resistance Settings
The Multisizer 4 software measures aperture resistance automatically at the start of each run. If
resistance is too high, it is likely that air is being drawn through the aperture tube. The electrolyte
level may be too low. Reset Multisizer 4 aperture resistance defaults only if you are using an
electrolyte with unusually high current resistance.
CAUTION
It is not possible to change aperture resistance settings unless you are running
Service Mode. Beckman Coulter does not recommend that you use the options
available in Service Mode without the assistance of a trained Service
Representative (see
Requesting Service and Technical Support , page 9-15 ).
To view aperture resistance settings:
1. Select
Run > Troubleshooting > Aperture Resistance Settings
on the Main Menu bar. The
Aperture Resistance Settings window opens.
2. If Enable Aperture Resistance Checking is selected, the Multisizer 4 will check aperture
resistance before each run based on values entered in the Maximum Resistance and
Measurement Current fields.
• The Maximum Resistance field displays the electrical resistance that will trigger the
following error message:
Aperture Resistance High, check the Sample Level
• The Measurement Current field displays the fixed current that the system will use to
measure resistance.