General Information

General Description 1

Section 1

General Information

1.1 General Description

The Victoreen® Model 943-227-15 Digital Preamplifier, is designed to operate with the Model 943-27, Current Mode Beta Scintillation detector and the Model 942A-200C Series Digital Ratemeter (UDR) or the Model 960 Series Digital Process Control system. When connected to the beta sensitive scintillation detector, it comprises a monitoring system which operates in the range of 10-3to 105 uCi/cc (or 1E0 to 1E8

Pico amperes). The UDR provides display, control, and annunciator functions for the monitoring system. The preamplifier contains a microprocessor controlled, auto-zeroing, integrating electrometer, a programmable gain amplifier, an analog-to-digital converter and an asynchronous serial communications interface. Communications with the UDR is accomplished via the optically isolated Victoreen Serial Communication Loop driver/receiver circuitry.

Interconnection of the detector and preamplifier is accomplished utilizing two, six (6) foot coaxial cables. One cable supplies the high voltage for the detector (negative polarity). The other cable is used for the detector output signal. Interconnection between the preamplifier and the UDR or 960 system is accomplished via a six-conductor cable and a high voltage coaxial cable.

The detector operates at a potential of approximately (-) 500 VDC, and produces a nominal DC output current of 1 x 10-12amperes to 1 x 10-4amperes. Depending on sampling geometry and detector set up, this corresponds to a range of 1 x 10-3to 1 x 10+5 uCi/cc.

The preamplifier is a self-contained electronics unit that processes the DC input signal from the detector, digitizes the signal, and transmits the digitized value to the readout via a modified RS232C compatible serial data communication port. It contains two printed circuit boards (mounted on the rear of the enclosure cover, a terminal block for terminating the field cable from its associated controller and two connectors for terminating the detector Signal and HV coaxial cables. The larger of the two printed circuit boards is the 977-210-10M Serial Interface board. This board controls the communications with the controller. The smaller board is the 977-200-15M Electrometer. It contains the microprocessor and associated circuitry for converting the detector output current into a digital value.

For additional information on the detector or readout device, refer to the instruction manual for the Model 943-27-31 detector, the Model 942A-200C UDR, or the applicable Model 960 System manual.

1.2 Application

The Model 943-227-15 Digital Preamplifier is used with the Victoreen 942A-200C or Model 960 microprocessor based radiation monitors. The Model 942A-200C or 960 system provides the +15 VDC preamplifier electronics power, (-) 500 VDC detector power and the RS232C serial communications support. The digital preamplifier is available in two serial port configurations. For applications less than 50 feet, the Model 943-227-15, configured for RS232C communications, is used. For applications requiring signal transmission distances of up to 1 mile, the Model 943-227-15VL, configured for Victoreen Loop communications is used. Table 1-1 is a list of available configurations and compatible 9XX series equipment. Please contact Fluke Biomedical Radiation Management Services for additional information.

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Fluke 943-27, 943-227-15 manual General Information, General Description, Application
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943-227-15, 943-27 specifications

The Fluke 943-27 and Fluke 943-227-15 are advanced electrical testing tools designed to meet the demands of professionals in industrial and commercial settings. Recognized for their accuracy and reliability, these devices come loaded with essential features tailored to ensure optimal performance during electrical measurements.

The Fluke 943-27 is a compact yet powerful multimeter that excels in providing precise voltage and current readings. It is equipped with a large, backlit display that ensures visibility in low-light environments. The device supports a wide range of testing parameters, including AC and DC voltage, resistance, continuity, and capacitance measurements, making it invaluable for troubleshooting electrical circuits.

On the other hand, the Fluke 943-227-15 offers additional capabilities, including advanced data logging features. This multimeter allows users to record and analyze measurements over time, which is particularly useful for identifying intermittent issues in electrical systems. Its connectivity options enable seamless data transfer to a computer or mobile device, facilitating easy documentation and reporting.

Both models illustrate a robust construction built to endure tough working conditions. They meet stringent safety standards, which is critical for protecting users from electrical hazards. The ergonomic design ensures comfort during prolonged use, and features like overmolding enhance grip and durability.

One of the standout technologies in these multimeters is Fluke’s True-RMS measurement capability. This feature ensures accurate readings of non-linear loads, which are common in modern electrical systems with variable frequency drives and other electronic devices. Additionally, the built-in low-pass filter technology reduces noise in measurements, ensuring precision even in environments with significant electrical interference.

The Fluke 943-27 and 943-227-15 are also designed to be user-friendly. They feature intuitive controls and a straightforward user interface, allowing technicians to navigate functions effortlessly. The ability to perform automatic ranging simplifies measurements, eliminating the potential for errors when setting the range manually.

In conclusion, the Fluke 943-27 and 943-227-15 represent essential tools for electrical technicians who require versatility, accuracy, and durability in their testing equipment. With advanced features, reliable technologies, and a user-centric design, these multimeters not only meet but exceed the expectations of professionals in the field.
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