Omega OMB-DAQBOARD-3000 Series User Manual page 83

External Acquisition Scan Clock Input
Maximum rate: 1.0 MHz
Clock Signal Range: Logical zero 0V to 0.8V; Logical one 2.4V to 5.0V; protected to ±15V
Minimum pulse width: 50 ns high, 50 ns low
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.
1. Single-Channel Analog Hardware Trigger: Any analog input channel can be software programmed as
the analog trigger channel, including any of the analog expansion channels.
Input Signal Range: -10 to +10V max
Trigger Level: Programmable; 12-bit resolution
Hysteresis: Programmable; 12-bit resolution
Latency: 350 ns typical, 1.3 µs max
Accuracy: ±0.5% of reading, ±2 mV offset
Noise: 2 mV RMS
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 temperature, then the driver automatically compensates for the delay required to
obtain 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"
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
Trigger Level: TTL
Minimum Pulse Width: 50 ns high; 50 ns low
Latency: 100 ns typical, 1.1 µs max
4. Digital Pattern Triggering: 8 or 16-bit pattern triggering on any of the digital input ports. Programmable
for trigger on equal, above, below, or within/outside of a window. Individual bits can be masked for
"don't care" condition.
Latency: One scan period max
5. Counter/Totalizer Triggering: Counter/totalizer inputs can trigger an acquisition. User can select to
trigger on a frequency or on total counts that are equal, above, below, or within/outside of a window.
Latency: One scan period max
6. Software Triggering: Trigger can be initiated under program control.
Note: Specifications are subject to change without notice.
988093
Specifications 7-3