Test and Measurement

测试与测量(T&M)的应用范围非常广泛,基本上包括在各种操作条件下(正常条件、操作极限或过应力的条件)检测物理变量(电流、电压、温度等)并记录和分析结果。
通常都需要有隔离,因为待测物的接地参考电压可能跟执行记录或分析的设备不同。在多通道或多参数T&M设备上,即使测量单元本身是电池供电的,输入电压与数据检测之间也需要电气隔离以避免串扰或干扰。

模拟输入T&M传感器通常需要双电源供电给运算放大器或精密信号放大器。输出被放大和调节并反馈到模数转换器,然后由数字隔离器将数据流隔离。ADC和DI需要从12V或24V主电源降压到独立3.3V或5V电源。
最后,数字总线隔离器(USB、CAN、GPIB等)对避免接地回路是不可或缺的,这样才能确保安全性或T&M系统的单一故障。

那么T&M系统需要什么样的AC/DC转换器?

Line powered T+M equipment can range from desktop products to rack installations with input voltage varying from nominal 90VAC to 277VAC, or even higher for industrial applications. At low power, from 3W to 20W, PCB mounted parts are often used such as the RAC03-K, RAC04-K/277, RAC05-K/480, RAC10-K/277 and RAC20-K. At higher power, from 40W to 550W, chassis-mounted parts RACM40-K, RACM60-K, RACM90-K, RACM230-G and RACM550-G might be chosen. Fan-less operation is often desirable in T+M environments and all these parts can give useful power to high temperatures without forced air, with the 230W and 550W products additionally able to operate with baseplate cooling. Depending on product, safety certifications are available for different end-application environments, IEC/EN 61010, IEC/EN 62368, IEC/EN 60601, EN 60335 as examples. EMC standards are met without additional components and all parts have low mains leakage current which can be critical in T+M applications, particularly in medical environments. Similarly, for sensitive measurements, the low output noise of the RECOM AC/DC power supplies can be a benefit.
  Series Power (W) Vin (V) Vout 1 (V) Isolation (kV) Mounting Type
1 AC/DC, 2.0 W, Single Output, THT RAC02E-K/277 Series
Focus
2.0 85.0 - 305.0 3.3 - 24.0 4.0 THT
2 AC/DC, 3.0 W, Single Output, THT RAC03-K Series
Focus
3.0 85.0 - 264.0 3.3 - 24.0 3.0 THT
3 AC/DC, 3.0 W, Single Output, THT RAC03E-K/277 Series
Focus
3.0 85.0 - 305.0 3.3 - 24.0 4.0 THT
4 AC/DC, 4.0 W, Single Output, THT RAC04-K/277 Series
Focus
4.0 80.0 - 305.0 3.3 - 24.0 4.0 THT
5 AC/DC, 5.0 W, Single Output, THT RAC05-K Series
Focus
5.0 85.0 - 264.0 3.3 - 24.0 3.0 THT
6 AC/DC, 5.0 W, Single Output, THT RAC05-K/277 Series
Focus
5.0 85.0 - 305.0 3.3 - 24.0 4.2 THT
7 AC/DC, 5.0 W, Single Output, THT RAC05-K/480 Series
Focus
5.0 85.0 - 528.0 5.0, 12.0, 15.0 5.4 THT
8 AC/DC, 5.0 W, Single Output, THT RAC05E-K Series
Focus
5.0 90.0 - 264.0 5.0 - 24.0 3.0 THT
9 AC/DC, 5.0 W, Single Output, THT RAC05E-KT Series
Focus
5.0 90.0 - 264.0 4.0 - 24.0 3.0 THT
10 AC/DC, 10.0 W, THT RAC10-K/277 Series
Focus
10.0 85.0 - 305.0 3.3 - 24.0 4.0 THT
11 AC/DC, 10.0 W, Single Output, THT RAC10E-K/277 Series
Focus
10.0 85.0 - 305.0 3.3 - 24.0 4.0 THT
12 AC/DC, 15.0 W, Single Output, THT RAC15-K Series
Focus
15.0 85.0 - 264.0 5.0 - 24.0 3.0 THT
13 AC/DC, 15.0 W, Single Output, THT RAC15-K/480 Series
Focus
15.0 85.0 - 528.0 5.0 - 24.0 3.6 THT
14 AC/DC, 20.0 W, THT RAC20-K Series
Focus
20.0 85.0 - 264.0 5.0 - 48.0 3.0 THT
15 AC/DC, 20.0 W, THT RAC20-K/277 Series
Focus
20.0 85.0 - 305.0 5.0 - 24.0 3.0 THT
16 AC/DC, 20.0 W, Single Output, THT RAC20E-K/277 Series
Focus
20.0 85.0 - 305.0 5.0, 12.0, 24.0 4.0 THT
17 AC/DC, 25.0 W, Single Output, THT RAC25-K/480 Series
Focus
25.0 85.0 - 528.0 5.0 - 24.0 3.6 THT
18 AC/DC, 230.0 W, Single Output, Connector RACM230-G Series
Focus
230.0 80.0 - 264.0 12.0 - 54.0 4.0 Connector
19 AC/DC, Single Output RACM40-K Series
Focus
30.0, 40.0 80.0 - 264.0 5.0 - 48.0 4.0 THT, Connector, PCB Mounting Pins
20 AC/DC, 550.0 W, Single Output, Connector/Screw Terminal RACM550-G Series
Focus
550.0 80.0 - 264.0 24.0 - 56.0 4.0 Connector/Screw Terminal
21 AC/DC, Single Output RACM60-K Series
Focus
40.0, 60.0 80.0 - 264.0, 80.0 - 305.0 5.0 - 48.0 4.0 Connector, PCB Mounting Pins
22 AC/DC, 90.0 W, Single Output, Connector RACM90-K Series
Focus
90.0 85.0 - 264.0 12.0 - 48.0 4.0 Connector
23 AC/DC, 30.0 W RACM30-K/277 Series
Coming Soon
30.0 85.0 - 305.0 5.0 - 24.0 4.0 THT, Wired, Push-in Terminal

高隔离转换器

RECOM提供极高隔离紧凑型DC/DC转换器。出色的SIP16封装RHV2/RHV3系列提供20kVDC隔离(12.5kVAC/1分钟),可在高真空离子泵、X射线设备和高压灰尘过滤器等应用中进行非常高的隔离测量。

我们的REM系列可提供高达10kVDC(5kVAC/1分钟)的隔离,经过认证可承受隔离壁垒上230VAC连续电流。转换器也提供1W至30W的输出功率。一个典型的应用是提供隔离给连接到电源电压的变压器、晶体管、二极管或电容的热电偶。

针对需要功能隔离来避免低压系统发生接地回路或干扰的T&M应用,RKE系列提供3kV、4kV或6kV隔离,性价比极高。
  Series Power (W) Vin (V) Nr. of Outputs Vout 1 (V) Mounting Type
1 DC/DC, 1.0 W, Single Output, THT REM1 Series
Focus
1.0 3.3, 5.0, 12.0, 15.0, 24.0 Single 3.3, 5.0, 12.0 THT
2 DC/DC, 3.5 W REM3.5E Series
Focus
3.5 4.5 - 9.0, 9.0 - 18.0, 18.0 - 36.0, 36.0 - 75.0 Single, Dual 5.0 - 24.0 THT, SMD
3 DC/DC, 5.0 W REM5E Series
Focus
5.0 4.5 - 9.0, 9.0 - 18.0, 18.0 - 36.0, 36.0 - 75.0 Single, Dual 5.0 - 24.0 THT, SMD
4 DC/DC, 6.0 W REM6E Series
Focus
6.0 9.0 - 18.0, 18.0 - 36.0, 36.0 - 75.0 Single, Dual 9.0 - 24.0 THT, SMD
5 DC/DC, 1.0 W, Single Output, THT RKE Series
Focus
1.0 5.0, 12.0, 24.0 Single 5.0 THT
6 DC/DC, 1.0 W, THT RP Series
Focus
1.0 5.0, 9.0, 12.0, 15.0, 24.0 Single, Dual 3.3 - 24.0 THT
7 DC/DC, 0.5 W, Single Output, SMD RxxCTxxS Series
Focus
0.5 5.0 Single 5.0 SMD
8 DC/DC, 1.0 W, THT RxxPxx/R Series
Focus
1.0 5.0, 9.0, 12.0, 15.0, 24.0 Single, Dual 3.3 - 15.0 THT
9 DC/DC, 3.0 W REC3-R Series
3.0 5.0, 12.0, 24.0 Single, Dual 5.0, 12.0, 15.0 THT, SMD
10 DC/DC, 6.0 W, THT REC6-RW/R Series
6.0 4.5 - 9.0, 9.0 - 18.0, 18.0 - 36.0, 36.0 - 75.0 Single, Dual 5.0 - 24.0 THT
11 DC/DC, 2.0 W, THT REM2 Series
2.0 3.3, 5.0, 12.0, 15.0, 24.0 Single, Dual 3.3 - 12.0 THT
12 DC/DC, 1.0 W, Dual Output, THT RH/H6 Series
1.0 5.0, 12.0, 15.0, 24.0 Dual 3.3 - 15.0 THT
13 DC/DC, 2.0 W, THT RHV2 Series
2.0 5.0, 12.0, 24.0 Single, Dual 5.0, 12.0, 24.0 THT
14 DC/DC, 3.0 W, THT RHV3 Series
3.0 5.0, 12.0, 24.0 Single, Dual 5.0, 12.0, 24.0 THT
15 DC/DC, 1.0 W, Single Output, THT RK/H6 Series
1.0 5.0, 12.0, 15.0, 24.0 Single 3.3 - 15.0 THT
16 DC/DC, 2.0 W, THT RV/R Series
2.0 3.3, 5.0, 12.0, 15.0, 24.0 Single, Dual 3.3 - 15.0 THT
17 DC/DC, 2.0 W, THT RxxP2xx/R Series
2.0 5.0, 12.0, 15.0, 24.0 Single, Dual 3.3 - 15.0 THT

母线电源隔离器

工业CAN总线、RS-485(ModBus)或GPIB系统通常与传感器、继电器、示波器和可编程电源或负载互相连接以建立自动测试设备(ATE)或SCADA(监控和数据采集)系统。这样的系统在接地点之间可能存在巨大的电位差,特别是在高压或大电流应用或长电缆中。如下图所示,隔离的串行接口、CAN-Bus收发器或USB隔离器消除了传感器单元之间电位差的影响。

隔离数据总线收发器需要为串行通信总线提供隔离电源,这通常是由输入电源供电、横跨隔离区间的隔离式DC/DC转换器提供。常见的输入和输出电压组合为3.3V至3.3V、5V至5V或3.3V至5V。
如下图所示,RECOM可提供现成的评估板(R-REF03-CAN1)以快速完成CAN总线系统的功能评估。


  Series Power (W) Vin (V) Nr. of Outputs Vout 1 (V) Mounting Type
1 DC/DC, 1.0 W, Single Output, SMD R1SX Series
Focus
1.0 3.3, 5.0, 12.0 Single 3.3, 5.0 SMD
2 DC/DC, 2.0 W, Single Output, SMD R2SX Series
Focus
2.0 5.0, 12.0, 24.0 Single 3.3 - 24.0 SMD
3 DC/DC, 2.0 W, Single Output, SMD RSH2 Series
Focus
2.0 3.3, 5.0, 12.0, 24.0 Single 3.3 - 24.0 SMD
4 DC/DC, 3.0 W, SMD RSH3 Series
Focus
3.0 12.0, 24.0 Single, Dual 5.0 - 24.0 SMD
5 DC/DC, 0.5 W, Single Output, SMD RxxCTxxS Series
Focus
0.5 5.0 Single 5.0 SMD
6 DC/DC, 1.0 W, Single Output R-REF03-CAN1 Series
1.0 3.3 Single 5.0
7 DC/DC, 0.5 W, Single Output, SMD R0.5S Series
0.5 3.3, 5.0, 12.0, 24.0 Single 5.0, 12.0, 15.0 SMD
8 DC/DC, 0.5 W, Single Output, SMD R0.5ZX Series
0.5 5.0 Single 5.0 SMD
9 DC/DC, 1.0 W, Single Output, SMD R1ZX Series
1.0 5.0 Single 5.0 SMD

低噪声转换器

许多传感器提供低电平输出; 例如K型热电偶在25°C时的热电电压仅1mV。高增益热电偶放大器容易受到共模噪声的影响,因此需要非常干静的电源。典型的未调节型隔离式DC/DC转换器的输出纹波为60-100mV p-p,可能会干扰测量。RECOM提供了与标准转换器有相同引脚分配的稳压型DC/DC转换器,结合了隔离式DC/DC转换器的电压稳定性以及线性稳压器的低噪声输出的优点作为解决方案。例如,RIZX-0505提供稳定5V输出,只有30mV的p-p纹波。如果这还是太高,可以使用简单的输入和输出滤波器将输出纹波减小到2mV p-p,隔离电源的噪声仅-68db。


  Series Power (W) Vin (V) Nr. of Outputs Vout 1 (V) Mounting Type
1 DC/DC, 1.0 W, Single Output, SMD R1SX Series
Focus
1.0 3.3, 5.0, 12.0 Single 3.3, 5.0 SMD
2 DC/DC, 2.0 W, Single Output, SMD R2SX Series
Focus
2.0 5.0, 12.0, 24.0 Single 3.3 - 24.0 SMD
3 DC/DC, 2.0 W, Single Output, SMD RSH2 Series
Focus
2.0 3.3, 5.0, 12.0, 24.0 Single 3.3 - 24.0 SMD
4 DC/DC, 0.5 W, Single Output, SMD RxxCTxxS Series
Focus
0.5 5.0 Single 5.0 SMD
5 DC/DC, 0.5 W, Single Output, SMD R0.5S Series
0.5 3.3, 5.0, 12.0, 24.0 Single 5.0, 12.0, 15.0 SMD
6 DC/DC, 0.5 W, Single Output, SMD R0.5ZX Series
0.5 5.0 Single 5.0 SMD
7 DC/DC, 1.0 W, Single Output, SMD R1ZX Series
1.0 5.0 Single 5.0 SMD

高输入电压、低输出电压转换器

虽然线性稳压器是低成本且可靠的器件,可将较高的输入电压降低至适合TTL或CMOS器件的低电源,但是效率非常低。开关模式DC/DC转换器是功率转换器,这意味着24V输入、5V/1A输出的转换器从主电源汲取输入电流仅稍微大于208mA,不到线性稳压器汲取电流的四分之一。因此,对多个独立通道的T&M设备来说,使用开关稳压器或隔离式DC/DC转换器来有效地为每个输入通道供电是很合理的。
  Series Power (W) Vin (V) Nr. of Outputs Vout 1 (V) Mounting Type
1 DC/DC, Single Output, PCB Mounting Pins RPMGQ-20 Series
Focus
100.0, 240.0 18.0 - 75.0 Single 5.0, 12.0 PCB Mounting Pins
2 DC/DC, Single Output, PCB Mounting Pins RPMGS-20 Series
Focus
100.0, 240.0 18.0 - 75.0 Single 5.0, 12.0 PCB Mounting Pins
3 DC/DC, 12.0 W, Single Output, THT RS12-Z Series
Focus
12.0 9.0 - 36.0, 18.0 - 75.0 Single 3.3 - 24.0 THT
4 DC/DC, 2.0 W, Single Output, THT RSE-Z Series
Focus
2.0 4.5 - 18.0, 9.0 - 36.0 Single 5.0 THT
5 DC/DC, 1.0 W, Single Output, THT RSOE-Z Series
Focus
1.0 4.5 - 18.0, 9.0 - 36.0 Single 5.0 THT
6 DC/DC, 2.0 W, THT RS Series
2.0 4.5 - 9.0, 9.0 - 18.0, 18.0 - 36.0, 36.0 - 72.0 Single, Dual 3.3 - 15.0 THT
7 DC/DC, 3.0 W, THT RS3 Series
3.0 4.5 - 9.0, 9.0 - 18.0, 18.0 - 36.0, 36.0 - 72.0 Single, Dual 3.3 - 15.0 THT
8 DC/DC, 1.0 W, THT RSO Series
1.0 4.5 - 9.0, 9.0 - 18.0, 18.0 - 36.0, 36.0 - 72.0 Single, Dual 3.3 - 15.0 THT

单电源/双输出转换器

DC/DC转换器通常是生成双极性电源的最简单、最便宜也最有效的方法。RECOM提供宽范围输入双输出转换器(±5V、±12V或±15V),适用于运算放大器的电源。满载输出功率额定值至250mW到40W,适合应用在极低功耗的设计和大型多通道系统供电。

一个应用示例是上桥臂电流检测电路。由于取样电阻连接到高AC或DC电压,因此要使用隔离式运放来测量其两端的压降。运放的隔离双极性电源是浮动的所以公共端(0Viso)可以直接连接到运放的输入端。
  Series Power (W) Vin (V) Nr. of Outputs Vout 1 (V) Mounting Type
1 DC/DC, 1.0 W, Dual Output, SMD R1DX Series
Focus
1.0 5.0 Dual 5.0 - 15.0 SMD
2 DC/DC, 2.0 W, THT RKZE Series
Focus
2.0 5.0, 12.0, 15.0, 24.0 Single, Dual 5.0 - 15.0 THT
3 DC/DC, 1.0 W, THT RP Series
Focus
1.0 5.0, 9.0, 12.0, 15.0, 24.0 Single, Dual 3.3 - 24.0 THT
4 DC/DC, 0.5 W, Dual Output, SMD R0.5D Series
0.5 3.3, 5.0, 12.0, 24.0 Dual 5.0, 12.0, 15.0 SMD
5 DC/DC, 2.0 W, Dual Output, SMD R2D Series
2.0 5.0, 12.0, 15.0, 24.0 Dual 5.0 - 24.0 SMD
6 DC/DC, 3.0 W REC3-R Series
3.0 5.0, 12.0, 24.0 Single, Dual 5.0, 12.0, 15.0 THT, SMD
7 DC/DC, 6.0 W, THT REC6-RW/R Series
6.0 4.5 - 9.0, 9.0 - 18.0, 18.0 - 36.0, 36.0 - 75.0 Single, Dual 5.0 - 24.0 THT
8 DC/DC, 2.0 W, THT REM2 Series
2.0 3.3, 5.0, 12.0, 15.0, 24.0 Single, Dual 3.3 - 12.0 THT
9 DC/DC, 2.0 W, THT RHV2 Series
2.0 5.0, 12.0, 24.0 Single, Dual 5.0, 12.0, 24.0 THT
10 DC/DC, 3.0 W, THT RHV3 Series
3.0 5.0, 12.0, 24.0 Single, Dual 5.0, 12.0, 24.0 THT
11 DC/DC, 2.0 W, THT RS Series
2.0 4.5 - 9.0, 9.0 - 18.0, 18.0 - 36.0, 36.0 - 72.0 Single, Dual 3.3 - 15.0 THT
12 DC/DC, 3.0 W, THT RS3 Series
3.0 4.5 - 9.0, 9.0 - 18.0, 18.0 - 36.0, 36.0 - 72.0 Single, Dual 3.3 - 15.0 THT
13 DC/DC, 1.0 W, THT RSO Series
1.0 4.5 - 9.0, 9.0 - 18.0, 18.0 - 36.0, 36.0 - 72.0 Single, Dual 3.3 - 15.0 THT

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