CEM DT-904 Digital RCD Tester

The CEM DT-904 Digital RCD Tester is a state-of-the-art device designed to meet the needs of modern electrical testing. One of its standout features is the ability to deliver a 2000ms readout, making it highly effective for testing the latest delay action breakers which require precise timing measurements. This tester offers a fully programmed operation, ensuring a streamlined and user-friendly experience for professionals.

Accuracy is paramount when it comes to RCD testing, and the DT-904 excels in this area with its digital readout of tipping time. This feature provides exact timing measurements that are crucial for assessing the safety and efficiency of electrical installations. Additionally, the tester includes two neon lamps that serve as a quick visual reference for correct wiring, adding an extra layer of verification to the testing process.

One of the most convenient features of the DT-904 is that it operates directly from the mains supply, eliminating the need for batteries. This not only makes the tester more environmentally friendly but also reduces the weight and complexity of the device, making it more manageable in a variety of testing environments.

The compact and lightweight design of the CEM DT-904 makes it easy to handle and operate. Its simplicity does not compromise its functionality, making it an ideal choice for both novice and experienced professionals. The inclusion of a zero-cross circuitry is particularly noteworthy, as it allows testing at both the 0° and 180° points of the sine wave. This capability enables the tester to display both the minimum (best) and maximum (worst) trip times, providing comprehensive data about the electrical safety of the system being tested.

Furthermore, the DT-904 features a data hold function that freezes the digital trip time displayed on the screen. This function is crucial for ensuring accurate readings, as it eliminates the possibility of human error during the readout process. With all these features packed into a single device, the CEM DT-904 Digital RCD Tester stands out as a highly effective tool for ensuring electrical safety and compliance in various installations.

CEM DT-904 Digital RCD Tester Specifications

Specifications
	Max Resolution	Accuracy
Trip current settings	5mA, 10mA, 30mA, 100mA, 300mA, 500mA
Test Current (No Trip Test)	50% of circuit breaker trip current selected	2000mS ± 5%
Test Current (Trip Test)	100% of circuit breaker trip current selected	2000mS ± 5%
Test Current (Fast Trip Test)	250mA regardless of circuit breaker trip current selected	40mS ± 5%
Fault trip Time	2000mS (40mS for Fast Trip)	±2%rdg ±3dgts
Resistance	0.1kΩ	±1.0%rdg ±2dgts
Operating Voltage	220V, 230V, 240V AC ± 10%	± 3%

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Brand

Cem

CEM Corporation Overview

Name: CEM DT-904 Digital RCD Tester - mme-ae
Brand: Cem
SKU: 81709

CEM Corporation, founded in 1978, is renowned for its pioneering contributions to scientific instrumentation with a focus on microwave-based technology for laboratory and research applications. The founders—Dr. Michael J. Collins (Chemist), Ronald Goetchius (Electrical Engineer), and Bill Cruse Jr. (Mechanical Engineer)—launched the company with a novel concept for microwave drying that significantly expedited moisture and solids analysis processes from hours down to minutes, which was a groundbreaking improvement at the time.

Product Innovation and Evolution

Over the years, CEM Corporation has expanded its product offerings beyond its original microwave moisture/solids analysis systems. Their portfolio now includes systems for:

Acid digestion for elemental analysis
Compositional testing of food products
Peptide and chemical synthesis

The company's dedication to innovation is reflected in their development of a diverse range of instruments suited for various applications from academic research to industrial quality control.