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In general, FastMode is identical to non-realtime sampling with the following
exceptions:
The sampling is limited to a single analog channel when doing FastMode sampling.
The selected channel must not be in operation mode 5, 6, or 7.
The communications with the host calculator are turned off during FastMode
sampling.
Note: In FastMode sampling, it is very important that the program not issue a GET command
until after sampling has been completed. If the CBL 2 receives a GET command it will abort
FastMode sampling with an error in order to respond to the GET command.
In FastMode, the sample times can be as fast as 20 msec (a sample frequency of 50KHz).
Mode Comparison Table
The table below shows some of the differences between the data collection modes.
Order of data
returned when
doing the GETs
from the host
calculator
Number of samples
limited?
Sample time limits
(approximate)
Number of
channels limited?
Can use
Triggering?
Communication
maintained during
sampling?
CBL 2 Technical Reference
Realtime Mode
{ch1_1, ch2_1, ...
deltatime_1}
{ch1_2, ch2_2, ...
deltatime_2}
:
:
{ch1_n, ch2_n, ...
deltatime_n}
Not by CBL 2, but
may be limited by
the host calculator
Sample Time > .25
second to 16000
seconds
Yes, only CH1-3
and 11
No
Yes
Non-Realtime
Mode
{ch1_1, ch1_2, ...
ch1_n}
{ch2_1, ch2_2, ...
ch2_n}
{ch3_1, ch3_2, ...
ch3_n}
{time_1, time_2, ...
time_n}
Yes, limited by
available memory
in CBL2
Sample Time ‚ 1e-4
seconds to 16000
seconds
No
Yes
Yes
FastMode
Same as Non-
Realtime
Same as Non-
Realtime
Sample Time ‚ 2e-5
seconds to 1e-4
seconds
Yes, only a single
channel from CH1
to CH3
Yes
No
7
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