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DDC01.2-N200A-DA02-01-Fw
您可以將每個(gè)D/A轉(zhuǎn)換器（DAC）連接到10 V的內(nèi)部參考電壓或連接到I/O連接器上外部參考（EXTREF）引腳的外部參考信號(hào)。施加到EXTREF的該信號(hào)應(yīng)在±11 V范圍內(nèi)。您可以配置每個(gè)通道以使用內(nèi)部或外部參考。默認(rèn)參考值選擇為內(nèi)部參考。模擬輸出寄存器選擇在正常操作中，DAC輸出在使用新值更新時(shí)會(huì)出現(xiàn)小故障。故障能量因代碼而異，在頻譜中表現(xiàn)為失真。每個(gè)模擬輸出通道都包含一個(gè)reglitch電路，該電路在每個(gè)代碼處產(chǎn)生均勻的小故障能量，而不是在主要代碼轉(zhuǎn)換處產(chǎn)生大的小故障。這種均勻的小故障能量在頻譜中顯示為更新率的倍數(shù)。請(qǐng)注意，此reglitch電路并不能消除故障；這只會(huì)使它們的大小更加均勻。默認(rèn)情況下，所有通道都禁用重新登錄，但您可以使用NI-DAQ為每個(gè)通道單獨(dú)啟用重新登錄。數(shù)字輸入/輸出設(shè)備包含八行通用數(shù)字輸入/輸出。您可以單獨(dú)使用軟件配置每一行的輸入或輸出。在系統(tǒng)啟動(dòng)和復(fù)位時(shí)，數(shù)字輸入/輸出端口均為高阻抗。通用計(jì)數(shù)器0和1的硬件上/下控制分別連接到DIO6和DIO7上。因此，您可以使用DIO6和DIO7來(lái)控制通用計(jì)數(shù)器。上升/下降控制信號(hào)僅為輸入信號(hào)，不影響

You can connect each D/A converter (DAC) to the internal reference of 10 V or to the external reference signal connected to the external reference (EXTREF) pin on the I/O connector. This signal applied to EXTREF should be within ±11 V. You can configure each channel to use either internal or external reference. The default reference value selection is internal reference. Analog Output Reglitch Selection In normal operation, a DAC output will glitch whenever it is updated with a new value. The glitch energy differs from code to code and appears as distortion in the frequency spectrum. Each analog output channel contains a reglitch circuit that generates uniform glitch energy at every code rather than large glitches at the major code transitions. This uniform glitch energy appears as a multiple of the update rate in the frequency spectrum. Notice that this reglitch circuit does not eliminate the glitches; it only makes them more uniform in size. By default, reglitching is disabled for all channels, however you can use NI-DAQ to independently enable reglitching for each channel. Digital I/O The device contains eight lines of digital I/O for general-purpose use. You can individually software-configure each line for either input or output. At system startup and reset, the digital I/O ports are all high impedance. The hardware up/down control for general-purpose counters 0 and 1 are connected onboard to DIO6 and DIO7, respectively. Thus, you can use DIO6 and DIO7 to control the general-purpose counters. The up/down control signals are input only and do not affect the operation of the