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•
Using the DAS-1700 Series with DriverLINX
Keithley DAS-1700 Series
Analog Input Timing Events
Timing Events specify how the hardware paces or clocks the acquisition of analog
input samples. DriverLINX uses the Timing Event to program when the DAS-1700
Series acquires the next analog input sample.
The DAS-1700 Series supports the following Timing Events:
•
None—Sampling requires no pacing as DriverLINX is acquiring only a
single value or scan.
•
Rate—The DAS-1700 Series supports fixed rate and burst mode
sampling using internal and external clocks.
•
Digital—DriverLINX uses an external digital input signal to pace the
acquisition of the next sample.
None or Null Timing Event
The Null Event specifies that the task does not need a clock to determine when to
acquire the next sample.
Rate Timing Event
The DAS-1700 Series supports two types of Rate Events for analog input:
•
Rate Generator—Generates a fixed rate clock with equal time
intervals between tics.
•
Burst Generator—Generates a dual frequency clock with a fixed
number of tics at a high frequency separated by a time interval at a
lower frequency.
DAS-1700 boards have a 5 MHz master clock frequency, or 0.2
µ
s tic period. The
sample period can range from 30 tics (6
µ
s) to
2
1
32
−
tics (833 s). This means the
sample rate can range from 0.00116 Hz to 162.5kHz. However, using multiple
channels or non-unity gains may reduce the maximum sample rate that the hardware
can accurately acquire. Also, HR models are limited to 50 kHz. Consult your
hardware manual for details.
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