Measurement Computing DaqBook 2000 Series - Manual (Page 19)

Triggering
DaqBook/2020, /2001, /2005, DaqOEM/2001, and DaqOEM/2005 each support a full complement of
trigger modes including:
• Hardware analog triggering – A user-programmed trigger level sets an analog DAC, which
is compared in hardware to the analog input level on the selected channel. Trigger latency
is < 5 µs.
• Digital and pattern triggering – TTL-level triggering and latencies less than 5 µs. The
trigger can be programmed for logic level or edge triggering. In pattern triggering, any of the
digital input ports acts as the trigger port. You can program the digital pattern.
• Software-based triggering – The PC detects the trigger event from analog, digital, or
counter readings. Six pre- and post-triggering modes are supported. Trigger latency is one
scan period.
Multi-unit synchronization via the SYNC ports does not support pre-trigger data.
Only post-trigger data can be collected and time correlated between the units.
Synchronous Input Operations
The DaqBook/2000 Series and DaqOEM/2000 Series devices allow for 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 inputs, 16-bit P3* digital
inputs or P2 compatible DBK digital input expansion modules.
*The 16-bit P3 digital inputs do not apply to DaqBook/2020, which has no P3 connector.
Analog Input Channels
The DaqBook/2000 Series and DaqOEM/2000 Series devices allow analog input for the device and for P1
compatible DBK analog input expansion modules.
Channel Selection and Mode Settings
The DaqBook/2000 Series and DaqOEM/2000 Series devices each 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 further
information.
The DaqBook/2020 accepts up to 14 single ended inputs.
Channel Range and Polarity
Each device channel can be programmed for either unipolar or bipolar mode with gain settings of 1, 2, 4,
8, 16, 32, and 64. Note that the DaqBook/2020’s front panel analog inputs are bipolar only.
Channel Sampling Interval
The DaqBook/2000 Series and DaqOEM/2000 Series devices allow for programmable sampling intervals
of 5us, 10us, or 1000µs on a per channel basis. This mode allows some channels which change slowly but
a higher degree of accuracy is desirable to be sampled at a longer interval while channels that change more
rapidly to be sampled using a shorter interval. Each 5us or 10us interval reduces the maximum aggregate
acquisition rate for the entire scan by that amount.
Note: DBK90 and DBK100 TC measurement modules sample at 1000µs/channel.
DaqBook/2000 Series and DaqOEM/2000 Series 898095 Device Overviews 2-3