National Instruments NI-9218 Channel Analogue Input Module
規格
- 產品名稱： NI-9218
- 連接器類型：LEMO 和 DSUB
- 測量類型：內建支援各種類型
- 感測器激勵：可選12V激勵
連接器類型
NI-9218 有多種連接器類型：帶有 LEMO 的 NI-9218 和帶有 DSUB 的 NI-9218。除非另有說明，否則 NI-9218 指兩種連接器類型。
NI-9218 腳位排列
Signals by Measurement Type
| 模式 | 別針
1 |
|||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
| ±16V | EX+ | — | AI-，EX- | — | — | AI + | — | — | — | — |
| ±65毫伏 | EX+ 2 [2] | — | 前任- [2] | — | — | AI + | AI- 3 | — | — | — |
| 滿的-
橋 |
EX+ [2] | — | 前任- [2] | RS+ | RS- | AI + | 人工智能- | SC | SC | — |
| 電力工程專業委員會 | — | AI + | 人工智能- | — | — | — | — | — | — | — |
| TEDS | — | T+ 4 | T- | — | — | — | — | — | — | T+ 5 |
信號說明
| 訊號 | 描述 |
| AI + | Positive analogue input signal connection |
| 人工智能- | Negative analogue input signal connection |
| EX+ | Positive sensor excitation connection |
| 前任- | Negative sensor excitation connection |
| RS+ | Positive remote sensing connection |
| RS- | Negative remote sensing connection |
| SC | Shunt calibration connection |
| T+ | TEDS data connection |
| T- | TEDS return connection |
測量類型
NI-9218 內建支援以下測量類型。
- ±16V
- ±65毫伏
- Full-Bridge
- 電力工程專業委員會
- NI-9218 with LEMO only.
- Optional sensor excitation.
- Tie to pin 3.
- TEDS Class 1 data connection.
- TEDS Class 2 data connection.
提示 NI recommends using the NI-9982 screw-terminal adapter when using built-in measurement types on the NI-9218.
使用特定測量適配器時，NI-9218 為以下測量類型提供額外支援。
- ±20 mA, requires the NI-9983
- ±60 V, requires the NI-9987
- Half-Bridge requires the NI-9986
- Quarter-Bridge requires the NI-9984 (120 Ω) or NI-9985 (350 Ω)
±16 V 連接
NI-9218 提供選購的 12 V 感測器激勵。若要使用 12 V 激勵，請將 9 VDC 至 30 VDC 電源連接到 Vsup，將感測器上的激勵端子連接到 EX+/EX-，並在軟體中啟用 12 V 激勵。
相關參考：
- NI-9982 ±16 V 連接腳
±65 mV 連接
- You must connect AI to EX- on the NI-9218.
- NI-9218 提供選購的 12 V 感測器激勵。若要使用 12 V 激勵，請將 9 VDC 至 30 VDC 電源連接到 Vsup，將感測器上的激勵端子連接到 EX+/EX-，並在軟體中啟用 12 V 激勵。
相關參考
- NI-9982 ±65 mV 連接腳
全橋連接
- The NI-9218 provides 2 V excitation to loads ≥120 Ω or 3.3 V excitation to loads ≥350 Ω.
- The NI-9218 provides optional connections for remote sensing (RS) and shunt calibration (SC). Remote sensing corrects for errors in excitation leads, and shunt calibration corrects for errors caused by resistance within one leg of the bridge.
相關參考：
- NI-9982 全橋連接接腳排列
IEPE 連接
- The NI-9218 provides an excitation current for each channel that powers IEPE sensors.
- AI+ provides DC excitation, and AI- provides the excitation return path.
相關參考：
- NI-9982 IEPE 連接引腳分配
±20 mA 連接
- Connecting ±20 mA signals requires the NI-9983.
- NI-9218 提供選購的 12 V 感測器激勵。若要使用 12 V 激勵，請將 9 VDC 至 30 VDC 電源連接到 Vsup，將感測器上的激勵端子連接到 EX+/EX-，並在軟體中啟用 12 V 激勵。
Connecting a loop-powered 2-wire or 3-wire transducer requires adding a 20 kΩ resistor between AI- and Ex-.
相關參考：
- NI-9983 腳位排列
±60 V 連接
Connecting ±60 V signals requires the NI-9987.
相關參考：
- NI-9987 腳位排列
半橋連接
- Connecting half bridges requires the NI-9986.
- The NI-9218 provides 2 V excitation to half bridges of ≥240 Ω total or 3.3 V excitation to half bridges of ≥700 Ω total.
- The NI-9218 provides optional connections for remote sensing (RS) and shunt calibration (SC). Remote sensing corrects for errors in excitation leads, and shunt calibration corrects for errors caused by resistance within one leg of the bridge.
相關參考：
- NI-9986 腳位排列
四分之一橋連接
- Connecting 120 Ω quarter bridges requires the NI-9984.
- Connecting 350 Ω quarter bridges requires the NI-9985.
提示 NI-recommends 2 V excitation when using a NI-9984 with 120 Ω quarter bridges and 3.3 V excitation when using the NI-9985 with 350 Ω quarter bridges.
相關參考：
- NI-9984/9985 腳位排列
TEDS 連接
For more information about TEDS, visit ni.com/info and enter the Info Code rdteds.
TEDS 支持
- TEDS 1 類感測器提供傳輸感測器資訊的介面。 NI-9218（含 LEMO）、NI-9218（含 DSUB）、NI-9982L、NI-9982D 和 NI-9982F 支援 TEDS 1 類感測器。
- TEDS Class 2 sensors provide an interface for transferring information from TEDS-enabled sensors. The NI-9218 with LEMO, NI-9982L, NI-9983L, NI-9984L, NI-9985L, and NI-9986L support TEDS Class 2 sensors.
Vsup 菊花鏈拓撲
帶有 LEMO 的 NI-9218 在 Vsup 連接器上提供四個引腳，用於菊花鏈連接。
NI-9218 連接指南
Make sure that the devices you connect to the NI-9218 are compatible with the module specifications.
客製化佈線指南
- 使用 NI-9988 焊杯連接器轉接器或 LEMO 壓接連接器 (784162-01) 建立客製化電纜時，請遵循下列準則。
- Use a shielded cable for all signals.
- Connect the cable shield to the earth ground.
- Use twisted-pair wiring for the AI+/AI- and RS+/RS- signals to achieve specified EMC performance.
NI-9218 框圖
- Two 24-bit analogue-to-digital converters (ADCs) simultaneously sample 兩個 AI 通道。
- The NI-9218 provides channel-to-channel isolation.
- The NI-9218 reconfigures the signal conditioning for each measurement type.
- The NI-9218 provides excitation for IEPE and bridge completion measurement types.
- The NI-9218 can provide optional 12 V sensor excitation for ±16 V, ±65 mV, and ±20 mA measurement types.
±16 V 和 ±65 mV 訊號調節
每個通道上的輸入訊號都經過緩衝、調節，然後amp由 ADC 領導。
全橋訊號調理
- The analogue input connections sense and then amplify the incoming analogue signal.
- The excitation connections provide differential bridge-excitation voltage.
- Remote sensing continuously and automatically corrects for lead-wire induced excitation voltage loss when using the RS connections.
- Shunt calibration can be used to correct for lead-wire-induced desensitisation of the bridge.
IEPE訊號調理
- The incoming analogue signal is referenced to an isolated ground.
- Each channel is configured for AC coupling with an IEPE current.
- Each channel provides a TEDS Class 1 interface.
±20 mA訊號調理
The NI-9983 provides a current shunt for the incoming analogue signal.
±60 V 訊號調理
The NI-9987 provides an attenuator for the incoming analogue signal.
半橋訊號調理
- The NI-9886 provides half-bridge completion resistors for the incoming analogue signal.
- You must connect AI+, EX+, and EX-.
- RS+ and RS- connections are optional.
- You do not need to connect the AI signal because it is connected internally.
四分之一橋模式調節
The NI-9984 and NI-9985 provide a quarter-bridge completion resistor and a half-bridge completion resistor.
濾
The NI-9218 uses a combination of analogue and digital filtering to provide an accurate representation of in-band signals while rejecting out-of-band signals. The filters discriminate between signals based on the frequency range, or bandwidth, of the signal. The three important bandwidths to consider are the passband, the stopband, and the alias-free bandwidth.
NI-9218 表示通帶內的訊號，主要透過通帶紋波和相位非線性進行量化。無混疊頻寬內出現的所有訊號要不是無混疊訊號，就是至少經過阻帶抑制濾波的訊號。
通帶
通帶內的訊號具有頻率相關的增益或衰減。增益相對於頻率的微小變化稱為通帶平坦度。 NI-9218 的數位濾波器會調整通帶的頻率範圍以符合資料速率。因此，給定頻率下的增益或衰減量取決於資料速率。
阻帶
濾波器會顯著衰減所有高於阻帶頻率的訊號。濾波器的主要目標是防止混疊。因此，阻帶頻率與數據速率精確相關。阻帶抑制是指濾波器對所有頻率在阻帶內的訊號施加的最小衰減量。
無混疊頻寬
Any signal that appears in the alias-free bandwidth of the NI-9218 is not an aliased artefact of signals at a higher frequency. The alias-free bandwidth is defined by the ability of the filter to reject frequencies above the stopband frequency, and it is equal to the data rate minus the stopband frequency.
打開測量適配器
該怎麼辦
- Unlock the measurement adapter housing/cover.
- Slide the measurement adapter housing/cover to access the screw terminals.
安裝 NI-998xD/998xL
使用什麼
- NI-998xD or NI-998xL Measurement Adapter
- M4 or Number 8 Screw
- 螺絲起子
該怎麼辦
Mount the measurement adapter to a flat surface using the mounting hole on the measurement adapter and the screw.
測量適配器接地
當測量適配器連接到 NI-9218 且 NI-9218 安裝在機箱中時，測量適配器上的接地端子連接到機箱接地。
測量適配器引腳排列
以下部分包括 NI-9218 測量適配器的引腳排列。
NI-9982 ±16 V 連接腳
Pins 3a and 3b are tied together on the NI-9982.
相關參考：
- ±16 V 連接
NI-9982 ±65 mV 連接腳
Pins 3a and 3b are tied together on the NI-9982.
相關參考：
- ±65 mV 連接
NI-9982 全橋連接接腳排列
Pins 3a and 3b are tied together on the NI-9982.
相關參考：
- 全橋連接
NI-9982 IEPE 連接引腳分配
Pins 3a and 3b are tied together on the NI-9982.
相關參考：
- IEPE 連接
NI-9983 腳位排列
Pins 3a and 3b are tied together on the NI-9983.
相關參考：
- ±20 mA 連接
NI-9984/9985 腳位排列
相關參考：
- 四分之一橋連接
NI-9986 腳位排列
Pins 3a and 3b are tied together on the NI-9986.
相關參考：
- 半橋連接
NI-9987 腳位排列
Pins 3a and 3b are tied together on the NI-9987.
相關參考：
- ±60 V 連接
常問問題
文件/資源
 |
美國國家儀器 NI-9218 通道類比輸入模組 [pdf] 使用說明書 帶 LEMO 的 NI-9218、帶 DSUB 的 NI-9218、NI-9218 通道類比輸入模組、NI-9218、通道類比輸入模組、類比輸入模組、輸入模組 |