Measurement Computing 2000 Series Daqboar - Manual (Page 52)

1-26 Daq Systems and Device Overviews 10-18-02 DaqBoard/2000 Series & /2000c Series User’s Manual
Single-Channel Analog Software Trigger: Any analog input channel, including any of the 256
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”
Latency: One scan period maximum
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 maximum
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 or outside of a window. Individual bits can
be masked for “don’t care” condition.
Latency: One scan period maximum
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 maximum
Software Triggering: Trigger can be initiated under program control.
Analog Output
Applicable to DaqBoard/2000, /2001, /2003, /2004, /2000c, /2001c, /2003c, and /2004c
The analog output channels are updated synchronously relative to scanned inputs, and clocked from
either an internal onboard clock, or an external clock source. Analog outputs can also be updated
asynchronously, independent of any other scanning in the system. Bus mastering DMA provides CPU
and system-independent data transfers, ensuring accurate outputs that are irrespective of other
system activities. Streaming from disk or memory is supported, allowing continuous, nearly-infinite
length, waveform outputs (limited only by available PC system resources).
Channels: DaqBoard/2000 and DaqBoard/2000c: 2 DAC channels (DAC0, DAC1)
DaqBoard/2001, /2003, /2004, /2001c, /2003c, /2004c:
4 DAC channels each (DAC0, DAC1, DAC2, and DAC3)
Resolution: 16 bits
Output voltage range:
±10 V
Output current:
±10 mA
Offset error:
±0.0045 V maximum
Gain error: ±0.01%
Update rate: 100 kHz maximum, 1.5 Hz minimum (no minimum with external clock)
Settling Time: 10 µs maximum to 1 LSB for full-scale step
Clock Sources: 4
1. Onboard D/A clock, independent of scanning input clock
2. Onboard scanning input clock
3. External D/A input clock, independent of external scanning input clock
4. External scanning input clock