42
•
Using the DAS-1700 Series with DriverLINX
Keithley DAS-1700 Series
For hardware independence,
specify the clock channel
using the symbolic constant,
DEFAULTTIMER, which
always maps to the default
Logical Channel for analog
input timing.
•
Specify internal clocking using a
Rate
Generator on Channel
0
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 30
tics, or 162.5 kHz (100 tics or 50 kHz for HR models). The maximum
period is 4294967295 tics (
2
1
32
−
), or 0.00116 Hz.
•
The Gate property specifies how the TGIN signal affects the operation
of the internal clock. Valid settings are Enabled, Disabled, and 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.
•
For simultaneous sampling using an SSH-8 accessory, check the
Simultaneous box in the Channels section. Simultaneous means that all
selected channels are sampled in each sample period.
Also see: “Repeat Mode Sampling on the DAS-1702HR-DA” on page 57.
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