46
•
Using the DAS-1700 Series with DriverLINX
Keithley DAS-1700 Series
Note: You cannot use a gated clock with a digital start or stop trigger.
•
The Pulses property specifies how many channels the board samples in
each Period. Pulses must equal the number of channels in the channel
list.
Also see: “Repeat Mode Sampling on the DAS-1702HR-DA” on page 57.
Burst Generator: External Clocking
An externally clocked Rate Generator produces a dual frequency clock with a fixed
number of tics at a high, internal frequency repeated at a lower, externally controlled
frequency.
Use an externally clocked burst generator when you want to synchronize a burst of
analog input samples with a recurrent external signal. In this mode you will need a
separate external clock tic for each burst of analog samples you want to acquire.
How to set up the DAS-1700 Series for burst mode sampling using an external clock.
BE SURE that the external
clock source is TTL
compatible, 0 V minimum to
+5 V maximum!
•
Specify external clocking using a
Burst
Generator on Channel
0
with
an
External, E
, or
External-
Clock source. See
“Counter/Timer Subsystem” on page 101 for a description of clock
sources. For hardware-independence, you can specify the hardware
external clock channel by the symbolic constant, DI_EXTCLK.
•
Users should connect the external clock signal to the XPCLK line.
•
Specify a Period between the minimum and maximum external
clocking period. The value doesn’t affect the external clock frequency,
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