與倪PXI-6280(零件號:779120-01)PXI多功能輸入輸出模塊, 用戶可以利用該信號量化已知寬度的脈沖，并根據(jù)結(jié)果確定信號的頻率。這種技術(shù)對高頻信號很有用。在這種方法中，用戶可以向計數(shù)器的門產(chǎn)生未知持續(xù)時間(T)的脈沖。用戶可以用第二個計數(shù)器產(chǎn)生脈沖。此外，用戶可以遠(yuǎn)程創(chuàng)建脈沖，并將其與PFI或RTSI終端相關(guān)聯(lián)。必須利用一個計數(shù)器來遠(yuǎn)程產(chǎn)生脈沖。當(dāng)通道A領(lǐng)先通道B一個正交周期時，計數(shù)器遞增。當(dāng)通道B領(lǐng)先通道A一個正交周期時，計數(shù)器遞減。每個周期增加和減少的度量取決于編碼的種類。

雙信號邊緣分離估計類似于脈沖寬度測量，除了有兩種估計:信號-輔助和門。Aux輸入上的有效邊沿開始計數(shù)，Gate輸入上的有效邊沿停止檢查。用戶應(yīng)啟動計數(shù)器，啟動雙邊沿分離估計。在計數(shù)器準(zhǔn)備好并且Aux輸入上出現(xiàn)有效邊沿后，計數(shù)器檢查源上上升(或下降)邊沿的數(shù)量。計數(shù)器忽略輔助輸入上的額外邊沿。這種估計可用于檢查事件或測量兩個信號邊沿之間發(fā)生的時間。

With the NI PXI-6280 (Part Number: 779120-01)PXI Multifunction I/O Module, the user can quantify a pulse of a known width utilizing the signal and determine the frequency of the signal from the outcome. This technique is useful for high frequency signals. In this method, the user can generate the pulse of unknown duration (T) to the Gate of a counter. The user can produce the pulse with a second counter. In addition, the user can create the pulse remotely and associate it to a PFI or RTSI terminal. One counter must be utilized to produce the pulse remotely. When channel A leads channel B in a quadrature cycle, the counter increments. When channel B leads channel A out of a quadrature cycle, the counter decrements. The measure of additions and decrements per cycle relies upon the sort of encoding.

Two-signal edge-separation estimation is like pulse-width-measurement, with the exception that there are two estimations: Signals-Aux and Gate. An active edge on the Aux input begins the counting and an active edge on the Gate input stops the checking. The user should arm the counter to start a two-edge separation estimation. After the counter has been armed and an active edge happens on the Aux input, the counter checks the quantity of rising (or falling) edges on the Source. The counter disregards extra edges on the Aux input. This estimation can be used to check events or measure the time that happens between edges on two signals.