Measurement Computing DaqBook 2000 Series - Manual (Page 82)

Specifications are subject to change without notice.
11-4 Specifications 898695 DaqBook/2000 and DaqOEM/2000 User’s Manual
Input Sequencer
Analog, digital and counter inputs can be scanned synchronously based either on an internal programmable timer, or
an external clock source. Analog and digital outputs can be synchronized to either of these clocks.
Scan Clock Sources: 2
1. Internal, programmable from 5
µs to 5.96 hours maximum in 1 µs steps
2. External, TTL level input up to 200 kHz maximum
Programmable parameters per scan: channel (random order), gain, unipolar or bipolar
Depth: 16,384 locations
On-board Channel to channel scan rate: 5 or 10
µs per channel, programmable
Expansion Channel Scan Rate: 5 or 10
µs per channel, programmable; 1 ms with DBK90 or DBK100
External Acquisition Scan Clock Input
Maximum Rate: 200 kHz
Clock Signal Range: 0V to +5V
Minimum Pulse Width: 50 ns high, 50 ns low
External Sync Ports
Number of External Sync Ports: 2, on rear panel
Maximum Number of Units to be Synchronized: 4 units, scan-synchronous (post trigger)
Maximum Length of Sync Cables: 15 feet (4.57 m), total for all cables
Triggering
Trigger Sources:6, individually selectable for starting and stopping an acquisition. Stop acquisition can occur on a
different channel than start acquisition; stop acquisition can be triggered via modes 2, 4, 5, or 6 described below.
Pre-trigger is supported with fixed or variable pre-trigger periods.
1. Single-Channel Analog Hardware Trigger.
Any analog input channel, including any of the analog expansion channels, can be software programmed as
the analog trigger channel.
Input Signal Range: -10V to +10V max
Trigger Level: Programmable, 11-bit resolution
Hysteresis: Programmable, 11-bit resolution
Latency: 5 µs max
2. Single-Channel Analog Software Trigger.
Any analog input channel, including any of the analog expansion channels, can be selected as the software
trigger channel. If the trigger channel involves a calculation, such as with temperature, then the driver
automatically compensates for the delay required to calculate the reading, resulting in a maximum latency of
one scan period.
Input Signal Range: Anywhere within the range of the selected trigger channel
Trigger Level: Programmable, 16-bit resolution, including “window triggering”
Hysteresis: Programmable, 16-bit resolution
Latency: One scan period max.
3. Single-Channel Digital Trigger: A separate digital input is provided for digital triggering.
Input Signal Range: -15V to +15V max.
Trigger Level: TTL
Minimum Pulse Width: 50 ns high, 50 ns low
Latency: 5
µs max.
4. Digital Pattern Triggering: 8 or 16-bit pattern triggering on any digital input. Programmable for trigger on
equal, above, below, or within or outside of a window. Individual bits can be masked for “don’t care”
condition.
Latency: One scan period maximum.