
248 BD FACSAria II User’s Guide
Unexpectedly low event
rate (continued)
Sample line installed
incorrectly
Verify the sample line installation.
See Changing the Sample Lines on
page 204.
Sample aggregates Filter the sample.
Memory is full Compare the processed event rate
in BD FACSDiva software with the
threshold counter. If the event rate
is much lower, exit and then
restart the application.
Distorted populations or
high CVs
Cytometer settings adjusted
incorrectly
Optimize the scatter parameters.
See Calculating Compensation on
page 148.
Flow rate is too high Decrease the flow rate in the
acquisition dashboard.
Window extension is too low Increase the window extension.
Bubbles in flow cell Turn off the stream, wait a few
seconds, and turn on the stream
again.
Nozzle is clogged or dirty Clean the nozzle as described in
Changing Nozzles on page 214.
Flow cell is dirty Clean the flow cell with a
detergent such as 100%
Contrad 70. See Clean Flow Cell
on page 188. Let the detergent sit
for 5 minutes before turning on
the stream.
Poor sample preparation Repeat sample preparation.
Area scaling is too low Verify area scaling. See Adjusting
Area Scaling and Laser Delay on
page 316.
Acquisition Troubleshooting (continued)
Observation Possible Causes Recommended Solutions
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