這SCXI 1305(零件號:777687-05)屏蔽接線盒可用于連接到以下模塊的輸入連接器SCXI-1120/D,SCXI-1121,SCXI-1125,SCXI-1126,SCXI-1140，或者SCXI-1141/1142/1143。這BNC接線端子有八個BNC連接器和一個SMB連接器，使信號連接盡可能簡單。BNC連接器用于八個模塊輸入的信號連接。SMB連接器提供對模塊數(shù)字信號的訪問。SMB連接器還提供對HOLDTRIG的訪問SCXI-1140模塊，以及的OUTCLK和EXTCLKSCXI-1141/1142/1143模塊。但是，這些信號在上并不活躍SCXI-1120/D,SCXI-1121,SCXI-1125，以及SCXI-1126。

在使用之前，用戶必須確定SCXI系統(tǒng)中存在哪種信號源國家儀器公司SCXI-1305 接線盒。信號源可以是浮動的或以地為參考的。浮動源不與建筑物接地系統(tǒng)相連，具有一個隔離的接地參考點，用戶無法保證該參考點與另一個地電位相等。然而，如果計算機連接到建筑物電源，則以地為基準的源連接到建筑物接地，并且與DAQ設(shè)備具有相同的接地。此外，用戶應(yīng)記住，僅在一個點上將輸入信號參考到地，但前提是源懸空。不需要參考地面參考源，因為它們已經(jīng)鏈接到建筑地面。

上的每個頻道鎳SCXI-1305可以利用開關(guān)設(shè)置配置為交流或DC耦合。要設(shè)置接線盒對于交流耦合，兩個開關(guān)都應(yīng)設(shè)置在交流位置。對于上的DC聯(lián)軸器SCXI-1305，兩個開關(guān)都需要設(shè)置到DC位置。

The SCXI 1305 (Part Number: 777687-05) Shielded Terminal Block can be utilized to connect to the following module’s input connectors: the SCXI-1120/D, SCXI-1121, SCXI-1125, SCXI-1126, SCXI-1140, or SCXI-1141/1142/1143. This BNC Terminal Block has eight BNC connectors and one SMB connector to make signal connections as simple as possible. The BNC connectors are used for signal connections to the eight module inputs. The SMB connector gives access to the module’s digital signals. The SMB connector also gives access to the HOLDTRIG for the SCXI-1140 module, as well as OUTCLK and EXTCLK for the SCXI-1141/1142/1143 modules. However, these signals are not active on the SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126.

The user must determine which kind of signal sources are present in the SCXI system prior to utilizing the National Instruments SCXI-1305 Terminal Block. The signal sources can be floating or ground-referenced. Floating sources are not linked to the building ground system and have an isolated ground-reference point that the user cannot guarantee is at equivalent potential as another ground. A ground-referenced source, however, is linked to the building ground and has the same ground as the DAQ device, if the computer is linked to the building power supply. In addition, the user should remember to reference an input signal to ground at just a single point, but only if the source is floating. Ground-referenced sources do not need to be referenced since they are already linked to the building ground.

Every channel on the NI SCXI-1305 can be configured for AC or DC coupling by utilizing the switch settings. To set up the Terminal Block for AC coupling, both switches should be set to the AC position. For DC coupling on the SCXI-1305, both switches need to be set to the DC position.