Keithley DAS-1700 Series
Using the DAS-1700 Series with DriverLINX
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67
Rate Generator: Internal Clocking
An internally clocked Rate Generator produces a fixed rate clock with equal time
intervals between tics.
Period
Use an internally clocked rate generator when you want to write analog output
samples at equally spaced time intervals.
How to set up the DAS-1700 Series for fixed rate writing using an internal clock.
For hardware independence,
specify the clock channel
using the symbolic constant,
DEFAULTTIMER, which
always maps to the default
Logical Channel for analog
output timing.
•
Specify internal clocking using a
Rate
Generator on Channel
1
with
the
Internal 1
Clock source. See “Counter/Timer Subsystem” on page
101 for a description of clock sources.
•
The Period property specifies the time interval between samples in tics,
where an
Internal 1
tic is 0.2
µ
s, or 5 MHz. The minimum period is 20
tics, or 250 kHz. The maximum period is 655350 tics (
)
1
2
(
10
16
−
×
),
or 7.63 Hz.
•
The Gate property specifies how the TGIN signal affects the operation
of the internal clock. Valid settings are Enabled, Disabled, High Level
and Low Level. See “Counter/Timer Subsystem” on page 101 for a
description of each Gate setting.
Note: You cannot use a gated clock with a digital start or stop trigger.
•
Check the Simultaneous box in the Channels section. Multi-channel
analog output on the DAS-1700 Series models is always simultaneous.
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