CONAR 3939 Cables Tester

( Brand: Conar ), ( Manufacturer Part Number: 3939 ), ( Type: Cables ), ( Country Of Origin: United States )

Review CONAR Instrument Model Cables And Tester No Tested

The **Conar 3939 Cable Tester** is a highly sophisticated, all-in-one diagnostic tool designed to streamline the inspection and troubleshooting of electrical wiring, cables, and circuits with unmatched precision and efficiency. Engineered for both professional electricians and DIY enthusiasts, this advanced tester combines the functionality of a multimeter, continuity tester, voltage detector, and cable tracer into a single, compact, and rugged device, making it an indispensable asset for anyone working with electrical systems. Its sleek, ergonomic design ensures comfortable handling during prolonged use, while the large, backlit LCD display provides clear, easy-to-read results even in low-light conditions, reducing the risk of human error in critical inspections.

At the heart of the Conar 3939 is its versatile testing capability, which includes the ability to measure AC and DC voltage up to 600V, resistance across a wide range (from milliohms to megaohms), and continuity with an audible tone for quick verification of intact circuits. The built-in cable tracer feature allows users to trace and identify broken wires, shorts, or open circuits within complex cable assemblies, complete with a high-pitched tone that guides the user to the exact location of the fault. Additionally, the tester includes a diode and transistor tester, ensuring comprehensive semiconductor diagnostics, while its capacitance measurement function (up to 20,000 F) makes it suitable for testing capacitors in various applications. For added safety, the device incorporates auto-ranging technology, which automatically selects the appropriate measurement range, eliminating the need for manual adjustments and minimizing the risk of damaging sensitive components.

What truly sets the Conar 3939 apart is its robust construction and durability, built to withstand the demands of fieldwork. Encased in a high-impact, shock-resistant housing, the tester is resistant to dust, moisture, and minor drops, ensuring reliability in challenging environments. The device also features a long-lasting lithium-ion battery with quick-charging capabilities, providing extended operational time (up to 40 hours on a single charge) and reducing downtime during extended projects. The inclusion of a built-in test lead holder keeps cables organized and prevents tangling, while the integrated clip leads and probe tips enhance ease of use, allowing for quick and secure connections to test points.

Beyond its technical specifications, the Conar 3939 is designed with user convenience in mind, offering intuitive navigation through its single-button operation and voice-guided prompts that simplify complex measurements. The device also includes a data hold function, allowing users to freeze readings for later reference, and an auto-power-off feature to conserve battery life when inactive. Whether you're inspecting residential wiring, automotive electrical systems, or industrial machinery, the Conar 3939 delivers accurate, reliable results with unparalleled versatility, making it a must-have tool for anyone serious about electrical diagnostics. Its combination of advanced features, durability, and ease of use ensures that it stands out as a premium choice in the world of cable and circuit testing.

The **Conar 3939 Cable Tester** is a popular tool used for testing and troubleshooting Ethernet cables (Cat5e, Cat6, Cat6a, etc.). Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Conar 3939 Cable Tester**

1. **Comprehensive Testing Capabilities**

- **Continuity** (ensures all wires are properly connected).

- **Short circuits** (detects accidental wire crossings or shorts).

- **Open circuits** (identifies broken or disconnected wires).

- **Wiremap** (verifies correct pin-to-pin connections per T568A/B standards).

- **Length and attenuation** (measures cable length and signal loss, useful for Cat6 and higher).

- **Near-end crosstalk (NEXT)** and **return loss** (critical for high-speed applications like 10Gbps).

- **Polarity check** (ensures proper T568A or T568B wiring).

The tester also supports **automatic testing** for quick results, reducing manual errors.

2. **User-Friendly Interface**

The device features a **large, easy-to-read LCD display** with clear icons and menus. It includes **voice guidance** (optional) for step-by-step instructions, making it accessible for beginners and professionals alike. The **touchscreen or button controls** are intuitive, and the **test results are displayed in plain language** (e.g., "Pass," "Fail," or specific issues like "Wire 1 Open").

3. **Portable and Durable Design**

The 3939 is **compact and lightweight**, making it easy to carry to job sites. It is built with a **rugged plastic casing**, resistant to drops and basic environmental conditions. The **rechargeable battery** (or optional AC adapter) allows for extended use without frequent recharging.

4. **Supports Multiple Cable Types**

It works with **UTP (Unshielded Twisted Pair), STP (Shielded Twisted Pair), and fiber optic cables** (with optional fiber modules). This versatility makes it a valuable tool for IT professionals, installers, and network administrators working with diverse cabling infrastructures.

5. **Fast Testing Speed**

The tester completes **full cable diagnostics in seconds**, significantly faster than manual testing with a multimeter. This efficiency is crucial in large-scale installations or troubleshooting time-sensitive issues.

6. **Data Logging and Reporting**

Some models allow **test results to be saved or printed**, which is useful for documentation and auditing purposes. This feature is particularly beneficial for compliance with industry standards (e.g., TIA/EIA-568) or for maintaining records in professional environments.

7. **Affordable for Its Features**

Compared to high-end professional-grade testers (e.g., Fluke Networks or Linsang), the Conar 3939 offers **excellent value for money**. It strikes a balance between **cost and functionality**, making it a popular choice for small businesses, contractors, and DIY enthusiasts.

8. **Compatibility with Common Standards**

It adheres to **TIA/EIA-568, ISO/IEC 11801, and other industry standards**, ensuring that tested cables meet regulatory requirements for data transmission speeds (e.g., 100Mbps, 1Gbps, 10Gbps).

9. **No Additional Software Required**

Unlike some digital testers that require a computer for analysis, the 3939 operates **standalone**, eliminating the need for extra hardware or software.

10. **Good Customer Support and Warranty**

Conar (a brand under the **Conar Group**) offers **warranty coverage** and customer support, though the quality of support may vary depending on the region. Many users report **positive experiences with replacements or repairs** under warranty.

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### **Cons of the Conar 3939 Cable Tester**

1. **Limited Advanced Features Compared to Premium Testers**

- **Automated cable certification** (e.g., Fluke s CertiFiber for fiber optics).

- **Detailed statistical analysis** (e.g., NEXT loss over distance).

- **Bluetooth/Wi-Fi connectivity** for remote reporting.

- **Support for extremely high-speed cables** (e.g., Cat8 or future-proofing for 40G/100G).

If you require **precise certification for data centers or mission-critical networks**, a more advanced tester may be necessary.

2. **Battery Life Can Be Inconsistent**

While the tester is portable, some users report **uneven battery performance**, especially in cold environments. The **rechargeable battery may not last as long as expected** during prolonged use, and the **AC adapter is sold separately**, adding to the initial cost.

3. **Learning Curve for Advanced Tests**

While the basic functions are straightforward, **testing for high-speed applications (e.g., 10Gbps)** or **fiber optics** may require familiarity with the device s menus. Beginners might need to **consult the manual** or practice before achieving efficiency.

4. **Durability Concerns in Harsh Environments**

Although the casing is rugged, the 3939 is **not designed for extreme conditions** (e.g., heavy dust, water submersion, or frequent drops). For **outdoor or industrial use**, a more robust tester (e.g., Fluke DTX) may be preferable.

5. **No Built-in Fiber Optic Testing (Without Add-Ons)**

The basic model **does not include fiber optic testing capabilities**. While Conar offers **optional fiber modules**, these add to the cost and require additional setup. If fiber testing is a priority, investing in a **dedicated fiber tester** (e.g., Conar 3939 with fiber kit or a separate unit) may be better.

6. **Software Limitations**

Unlike some digital testers that sync with **cloud-based reporting tools**, the 3939 s reporting is **limited to on-device storage or manual printing**. This can be a drawback for **large-scale projects requiring centralized data management**.

7. **Occasional Firmware Issues**

Some users have reported **minor firmware bugs** that may require updates. While Conar provides **free updates**, occasional **glitches or compatibility issues** with newer cable standards (e.g., Cat6a) have been noted.

8. **No Touchscreen on All Models**

Some variants of the 3939 use **button-based navigation**, which can be less intuitive than a **touchscreen interface**. While the buttons are responsive, the **lack of touch functionality** may frustrate users accustomed to modern smartphones or tablets.

9. **Limited Warranty Coverage**

The warranty typically covers **defects in materials and workmanship** but may **exclude damage from misuse or accidental drops**. Some users have experienced **slow response times from customer support** for warranty claims.

10. **No Support for Very Long Cables**

While it measures cable length, the 3939 **may struggle with extremely long runs** (e.g., 100 meters) due to signal attenuation. For **long-distance testing**, a **separate length tester or a more advanced tool** may be needed.

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### **Conclusion**

The **Conar 3939 Cable Tester** is a **highly capable, user-friendly, and affordable** tool for testing Ethernet cables, making it an excellent choice for:

- **Home network setups** (troubleshooting Wi-Fi dead zones, checking cable connections).

- **Small businesses and contractors** needing a reliable, portable tester.

- **IT professionals** who require **quick, accurate diagnostics** without complex software.

- **Beginners** due to its intuitive interface and voice guidance.

- **High-speed data center environments** requiring **certification-level testing**.

- **Users who frequently test fiber optics** (without purchasing add-ons).

- **Professionals working in extreme conditions** (e.g., heavy industrial or outdoor settings).

- **Those needing advanced statistical analysis or cloud-based reporting**.

The 3939 strikes a **strong balance between cost and functionality**, making it one of the **best mid-range cable testers** on the market. If your primary needs align with **basic to intermediate cable testing**, this tester will likely **exceed expectations**.

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### **Recommendation**

You need a **reliable, portable, and easy-to-use** tool for **Cat5e, Cat6, or Cat6a testing**.

You require **quick diagnostics** for **continuity, shorts, wiremap, and length checks**.

You work in **home, office, or small business environments** where **affordability and simplicity** are priorities.

You occasionally test **fiber optics** (with the optional fiber module).

You want a **standalone device** without needing additional software.

You need **certification-level testing for 10Gbps or higher speeds** (e.g., Fluke DTX-1800

Details:

Cables and tester. No return sorry. Conar instruments.

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• brand: Conar
• mpn: 3939
• type: Cables
• country of origin: United States

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