IOtech DaqBook/2000 Series, Руководство пользователя

Страница: 67 / 90

SYNC Notes :
•
When a DaqBook is programmed as a synchronization slave, the TTL trigger source is
automatically derived from the SYNC port.
•
When a DaqBook is programmed as a synchronization master, it will output its trigger
condition on the SYNC port.
•
When synchronizing two or more DaqBooks, the slave units should have at least 0.1 µs of
dead time in the scan period. By “dead time,” we mean a duration in which no channels
are sampled. This accommodates fundamental differences in the clocks [for each
DaqBook].
•
All DaqBooks that are connected via SYNC cables can be scan-synchronized to within
0.1 µs of each other.
•
A maximum of 4 units can be synchronized; scan-synchronous (post trigger).
•
SYNC cables are not to exceed a total combined length of 15 feet (4.57 m).
Synchronous Input Operations
DaqBooks allow synchronous scanning and acquisition of Analog Input, Digital Input and Counter Input
Data at up to 200 kHz aggregate scanning rates. The Analog Input data can be either main unit or
expansion modules from P1 compatible analog input modules. The Digital Input data can be main unit 8-
bit P2 (8255) digital input or P2 compatible DBK digital input expansion modules. For DaqBook/2001,
DaqBook/2005 and the DaqOEM equivalents, 16-bit P3 digital inputs are applicable. DaqBook/2020 has
no P3 connector, but uses of BNC connectors for the same functionality.
Analog Input Channels
P1 – Channels 0 through 15
DaqBooks allow analog input configuration of themselves, as well as for the P1 compatible DBK analog
input expansion modules.
Channel Selection and Mode Settings
The DaqBook/2001, /2005 and DaqOEM/2001 and /2005 can accept up to 16 single ended or up to 8
differential-ended inputs and can be programmed for single-ended or differential-ended on a per channel
basis. Just one analog channel is sacrificed when a DBK expansion module is enabled. See DBK
documentation in the
DBK Option Cards & Modules User’s Manual (p/n 457-0905) for additional
information.
DaqBook/2020 can accept up to 14 single-ended inputs. One analog channel is sacrificed when a DBK
expansion module is enabled. See DBK documentation in the
DBK Option Cards & Modules User’s
Manual (p/n 457-0905) for additional information.
Channel Range and Polarity
DaqBook channels can be programmed for either unipolar or bipolar mode with gain settings
of 1, 2, 4, 8, 16, 32 and 64.
Channel Sampling Interval
DaqBooks allow for programmable sampling intervals of 5 us, 10 us, or 1000 us on a per channel basis.
This mode allows some DBK expansion channels [which change slowly but offer a higher degree of
accuracy] to be sampled at a longer interval, while channels that change more rapidly to be sampled using a
shorter interval. Each 5 µs, 10 µs, or 1000 µs interval reduces the maximum aggregate acquisition rate for
the entire scan by that amount.
DaqBook/2000 and DaqOEM/2000 Series
898695
Taking Measurements 8-5