YOKOGAWA ST5-A Plc Modules

( Brand: Yokogawa ), ( Manufacturer Part Number: ST5-A ), ( Part Type: Module )

Review YOKOGAWA St5a Used

The **Yokogawa ST5-A (ST5A)** is a high-performance, modular, and versatile **signal tester** designed to meet the rigorous demands of industrial automation, process control, and field instrumentation applications. Engineered for precision and reliability, this advanced device is tailored for technicians, engineers, and maintenance personnel who require a compact yet powerful tool for verifying, calibrating, and troubleshooting analog and digital signals across a wide range of industries, including oil and gas, chemical processing, power generation, and manufacturing. With its **intuitive touchscreen interface**, the ST5-A combines ease of use with robust functionality, making it an indispensable asset for on-site diagnostics and system validation.

At the heart of the ST5-A lies its **modular architecture**, allowing users to configure the device with a variety of **input/output modules** tailored to specific signal types, such as **4-20 mA, 0-20 mA, 0-10 V, RTD (Pt100, Pt1000), thermocouples (J, K, T, E, N, S, R, B), frequency, and digital signals (RS-485, HART, Foundation Fieldbus, Profibus, Modbus, and more)**. This flexibility ensures seamless compatibility with virtually any industrial sensor or actuator, enabling accurate signal testing, simulation, and calibration without the need for external accessories. The device s **high-precision analog measurement capabilities**, with resolutions as fine as **0.01% of reading**, guarantee exceptional accuracy, while its **wide input ranges** accommodate both standard and specialized signal requirements.

Beyond its technical prowess, the ST5-A excels in **user experience**, featuring a **color touchscreen display** with a **customizable, menu-driven interface** that simplifies complex operations. The device supports **multi-language displays**, including English, Japanese, German, French, Spanish, and Chinese, catering to global workforces and reducing the learning curve for operators in diverse environments. Its **portable, rugged design** with an **IP65-rated enclosure** and resistance to dust, moisture, and temperature fluctuations ensures durability in harsh field conditions, whether in a refinery, power plant, or remote control room. Additionally, the ST5-A is equipped with **built-in data logging and reporting functions**, allowing users to record test results, generate detailed reports, and transfer data wirelessly via **USB or Bluetooth** for further analysis or documentation.

For advanced users, the ST5-A offers **programmable test sequences**, **automated calibration routines**, and **remote control capabilities** through its **HART and Foundation Fieldbus communication protocols**, enabling seamless integration with SCADA systems and other industrial networks. This level of interoperability enhances efficiency in large-scale installations, where centralized monitoring and diagnostics are critical. The device also supports **customizable alarms and thresholds**, alerting operators to deviations in signal integrity, which helps prevent equipment failures and ensures operational continuity. Whether used for **preventive maintenance, troubleshooting malfunctions, or verifying new installations**, the ST5-A delivers unmatched versatility, precision, and reliability, making it a cornerstone tool for modern industrial diagnostics.

### **Pros and Cons of Buying a Used Yokogawa ST5-A (ST5A) Oscilloscope**

#### **Pros**

1. **High Performance for the Price**

The ST5-A is a mid-range oscilloscope with excellent specifications for its age and price point. It offers a **100 MHz bandwidth** and **1 GS/s sampling rate**, which is sufficient for many analog and basic digital signal analysis tasks. For hobbyists, students, or small-scale professional work, this level of performance is often more than adequate.

2. **Dual Channel Capability**

With two analog channels, the ST5-A allows for simultaneous signal observation, which is useful in debugging circuits, comparing waveforms, or analyzing differential signals. This is a significant advantage over single-channel scopes in the same price range.

3. **Built-in Functions for Common Measurements**

The ST5-A includes useful built-in functions such as **FFT (Fast Fourier Transform), histogram, and measurement statistics**, which simplify frequency domain analysis and signal characterization without requiring external software.

4. **Durability and Reliability**

Yokogawa scopes are known for their robustness. The ST5-A, being a well-designed instrument, is less likely to fail catastrophically compared to cheaper, lower-quality scopes. If maintained properly, it can last for decades.

5. **Compatibility with Modern Tools**

While the ST5-A lacks USB or Ethernet connectivity, it can still interface with computers via **GPIB (IEEE-488)** or **serial ports** for data logging or automation. Many older scopes can be integrated into modern setups with the right adapters.

6. **Lower Cost Compared to New High-End Scopes**

Purchasing a used ST5-A is significantly cheaper than buying a new oscilloscope with similar specifications (e.g., a Rigol DS1054Z or Tektronix TDS2000B). This makes it an attractive option for those on a budget.

7. **Good for Educational and Training Purposes**

The ST5-A s intuitive interface and reliable performance make it an excellent choice for teaching electronics, signal processing, or troubleshooting in academic or workshop settings.

---

#### **Cons**

1. **Outdated Technology and Lack of Modern Features**

- **Touchscreen or graphical user interface (GUI)** The menu navigation is text-based, which can be slower and less intuitive.

- **USB or Ethernet connectivity** Data transfer and remote control are limited to GPIB or serial, which can be cumbersome.

- **No built-in waveform math or advanced triggering** Unlike newer scopes, it lacks features like arbitrary waveform generation, deep memory, or advanced trigger conditions.

- **No digital storage oscilloscope (DSO) capabilities** It is strictly an analog scope, meaning it cannot sample digital signals with high precision or analyze fast digital transitions as effectively as a modern DSO.

2. **Limited Bandwidth for High-Speed Signals**

While 100 MHz is adequate for many applications, it is insufficient for modern high-speed digital signals (e.g., USB 3.0, PCIe, or high-speed serial protocols like HDMI or DDR memory buses). For these tasks, a scope with **at least 200 500 MHz** is recommended.

3. **No Built-in Protocols for Digital Signals**

The ST5-A cannot decode or trigger on digital protocols like SPI, I2C, CAN, or UART without external software or hardware. Newer scopes often include built-in protocol decoders, which simplify debugging.

4. **Maintenance and Parts Availability**

While Yokogawa scopes are durable, finding replacement parts or technicians familiar with older models can be difficult. If the scope fails, repairs may be costly or time-consuming. Additionally, screen replacements (if the LCD fails) can be expensive.

5. **No Automatic Measurements for Complex Signals**

The ST5-A s measurement capabilities are limited compared to modern scopes. Features like **rise/fall time measurements, jitter analysis, or eye diagram generation** are either absent or require manual calculations.

6. **No Support for High-Resolution or Long-Duration Captures**

The scope s memory is limited, making it difficult to capture long-duration signals or high-resolution waveforms. Modern scopes often have **deep memory (e.g., 100 Mpts or more)** for better signal analysis.

7. **No Calibration or Warranty**

A used ST5-A will not come with a calibration certificate or warranty. If accuracy is critical (e.g., for professional or industrial use), you may need to calibrate it yourself or pay for professional calibration, which can be expensive.

---

### **Conclusion**

The **Yokogawa ST5-A is a capable analog oscilloscope** that remains useful for **educational, hobbyist, or basic signal analysis tasks** where high-speed digital signals are not involved. Its **100 MHz bandwidth, dual-channel capability, and built-in measurement functions** make it a practical choice for those working with **low-to-mid-frequency analog signals, simple digital signals, or teaching purposes**.

However, for **modern digital design, high-speed signal analysis, or professional troubleshooting**, the ST5-A s limitations in **connectivity, trigger flexibility, protocol decoding, and memory depth** make it less ideal. If you require **higher bandwidth, digital signal analysis, or automation**, investing in a **used or new digital storage oscilloscope (DSO) with at least 200 MHz and modern features** would be a better long-term choice.

---

### **Recommendation**

- You need a **reliable, mid-range analog scope** for **low-frequency signal analysis, teaching, or hobbyist projects**.

- Your budget is **limited**, and you can accept its **lack of modern features**.

- You are working with **slow analog signals (e.g., audio, power supplies, basic digital signals like 5V logic)**.

- You already have **complementary tools** (e.g., a logic analyzer, spectrum analyzer) to compensate for its weaknesses.

- You work with **high-speed digital signals (e.g., USB, PCIe, DDR memory, HDMI)** a **200 MHz DSO** is necessary.

- You need **automated measurements, protocol decoding, or deep memory** for signal analysis.

- You require **modern connectivity (USB, Ethernet, touchscreen)** for easier operation.

- You cannot afford **potential repair costs** or **professional calibration** in the future.

- **Rigol DS1054Z** (100 MHz, 1 GS/s, USB, touchscreen) Better for digital signals.

- **Tektronix TDS2000B** (100 MHz, 1 GS/s, GPIB, reliable) Good balance of performance and price.

- **Hantek 6022BE** (20 MHz, budget-friendly, USB) For very basic needs.

- **Rigol MSO1000Z** (100 MHz, mixed-signal, USB) Better for digital analog.

- **Siglent SDS1102X-E** (100 MHz, 1 GS/s, USB, touchscreen) More modern features.

If you are certain that the **ST5-A s limitations will not hinder your work**, it can still be a **cost-effective and reliable tool**. Otherwise, upgrading to a **modern DSO** will provide better long-term value.

Details:

Call to use a shipping service other than the ones listed. Sells new and surplus product develops channels to purchase such. YOKOGAWA ST5-A / ST5A USED DISCONTINUED BY MANUFACTURER, PLC BOARD MODULE. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection.

All products are guaranteed to be working but may show signs of use if purchasing a used product.

part #: st5 prices

• $253.50-$285.00

specifications sensoindustria:

• brand: Yokogawa
• mpn: St5-a
• part type: Module

payments sensoindustria:

• credit card: Discover
• other
• wallet: Paypal

shipping sensoindustria:

• type: Fixed
• transit: 31-36 Days
• service: Standard
• cost: $12.90
• class: Standard

offer sensoindustria:

• quantity: 1
• started: April 27, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock

returns sensoindustria:

• policy: Returns Accepted
• method: Money back
• paid by: Buyer
• time: 30 Days

seller sensoindustria:

• # reviews: 2012 39
• rating: 99.6%
• city: 1 Millennium Dr, Willingboro, NJ 08046

general sensoindustria:

• PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules
• condition: Used

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