Keithley DAS-8 Series User Manual page 34

Operation is started
External Clock
Source
Internal Clock
Source
(idle state)
Conversions begin
when using an
internal clock source
Figure 2-3. Initiating Conversions
The ADC acquires data at a maximum of 4kHz (one sample every
Note:
µ
25 s). If you are using a hardware external clock, make sure that the
clock does not initiate conversions at a faster rate than the ADC can
handle.
If you are acquiring samples from multiple channels, the maximum
sampling rate for each channel is equal to 4kHz divided by the number of
channels.
The rate at which the computer can reliably read data from the board
depends on a number of factors, including your computer, the operating
system/environment, whether you are using expansion boards, the gains
of the channels, and software issues.
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Conversions begin
when using an
external clock source
count
count count count
2-13