Alldaq ADQ-250 cPCI, Manual

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Introduction 7
Manual ADQ-250 series Rev. 0.9 Introduction
1.4 Short description
The measurement boards of the ALLDAQ ADQ-250 series are CompactPCI or PCI-Express
boards for high precision voltage measurements in industry and laboratory with a bandwidth
of up to 280 kHz. By the potential-free voltage inputs and the full differential sampling parasitic
effects like ground loops and common mode errors can be largely rejected. The input voltage
range is from -10.24 V to +10.24 V for full ±10 V peak to peak. Optional an input voltage range
of ±102.4 V is possible. The 8 analog input channels are electrically isolated up to 700 V
RMS
between each other and against PC ground.
Depending on the application you can choose between 3 models: the ADQ-255 with 8 x 16 bit
A/D converters and 250 kS/s sample rate, the ADQ-256 with 8 x 16 bit A/D converters and
2 MS/s sample rate and the ADQ-258 with 8 high-precision 18 bit A/D converters sampling with
1.6 MS/s. All channels are always sampled synchronously. The values can be acquired as single
values or timer-controlled. On demand the measurement can be started or stopped by two
external trigger inputs, which are isolated against PC ground and to the analog inputs.
ADQ-255 ADQ-256 ADQ-258
PC interface CompactPCI or PCI Express
Analog inputs 8 differential 8 differential 8 differential
Resolution
16 bit 16 bit 18 bit
Sampling rate 250 kS/s 2 MS/s 1.6 MS/s
Bandwidth 50 kHz (0 dB) 280 kHz (-3 dB) 280 kHz (-3 dB)
Table 1: Overview ADQ-250 series
The 8 bit TTL digital I/O port can be attached by the HDMI connector at the front panel. If the
digital port is configured as input the inputs can be monitored on bit-change and can generate
an interrupt.