Measurement Computing WBK40 - Manual (Page 30)

Triggering
WBK40, Trigger Sources
Four, 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 or 4 described below. Pre-trigger is
supported with fixed or variable pre-trigger periods.
WBK41, Trigger Sources
Six, 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 can be software programmed as the analog trigger channel, including any of the 224
TC expansion channels.
Input Signal Range: -10 V to +10 V max
Trigger Level: Programmable (11-bit resolution)
Hysteresis: Programmable (11-bit resolution)
Latency: 5 µs max
2. Single-Channel Analog Software Trigger
Any TC input channel, including any of the 224 TC expansion channels,
can be selected as the software trigger channel
Input Signal Range: Anywhere within 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: 5 µs max
4. Software Triggering
Trigger can be initiated under program control.
5. 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
6. 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.
Note: Specifications are subject to change without notice.
pg. 30, WBK40 & WBK41 926896 Thermocouple and Multifunctional Modules