Product Overview
Ortec 441 NIM Ratemeter - 0-500K CPS, Analog Meter Display, 0-100mV Output
Condition
Single unit available. Used, in good condition with light surface patina consistent with lab service. Front panel knobs intact, analog meter present, BNC connector confirmed visible. Rear panel shows 0-100mV BNC output and banana terminals. Tested to power on - no further testing performed. Sourced from a government research facility. Covered by our no-hassle guarantee.
Ships same business day from Idaho. Packed carefully.
Product Overview
Ortec Model 441 is a single-width NIM (Nuclear Instrumentation Module) linear count ratemeter designed for nuclear physics and radiation detection work. It accepts standard NIM slow logic pulses from detectors or discriminators and converts pulse frequency into a continuous analog signal proportional to the count rate. A front-panel analog meter provides direct visual rate indication. An analog output on the rear panel delivers 0-100mV full scale for connection to recorders or auxiliary instrumentation. Count rate range spans 0 to 500,000 counts per second. Selectable time constants allow the operator to trade response speed against statistical accuracy. The module requires a standard NIM bin for power and mechanical support.
Key Features
- Count rate range: 0-500,000 CPS (linear scale)
- Analog meter display on front panel for direct visual monitoring
- Analog output: 0-100mV full scale, adjustable, via rear BNC
- Rear panel banana terminals for additional output connections
- Selectable standard deviation: 1%, 3%, 10%
- Input: NIM slow logic, +2V amplitude minimum, 200ns minimum pulse width, DC-coupled, ~2500 ohm impedance
- Input maximum: ±100V pulse amplitude, ±30V average
- Power: +12V at 65mA, -24V at 10mA from NIM bin
- Stability: better than ±0.05% of full scale per day at constant temperature
- Temperature coefficient: 0.05% of full scale per °C
- Operating temperature: 0-50°C
- Form factor: standard single-width NIM module (~1.35 inches wide)
Applications
- Nuclear physics laboratory experiments requiring real-time count rate monitoring
- Radiation detector characterization and calibration setups
- Environmental radiation monitoring with analog recorder output
- Educational nuclear instrumentation systems in university physics departments
- Legacy NIM-based measurement systems requiring original-format modules
Frequently Asked Questions
Does this require a NIM bin to operate?
Yes. The 441 draws +12V at 65mA and -24V at 10mA from a standard NIM bin power supply. It will not operate standalone.
What type of input signal does it accept?
Standard NIM slow logic pulses. Minimum +2V amplitude, minimum 200ns pulse width, DC-coupled input at approximately 2500 ohms. Maximum pulse amplitude is ±100V; maximum average is ±30V.
Was this unit function tested?
Tested to power on. No further functional testing was performed. Sourced from a government research facility and visually inspected - front panel, knobs, meter, and connectors all confirmed present and intact.
Is a manual included?
Not included.
How does the 441 differ from the Ortec 449?
The 441 is a linear-only ratemeter. The 449 provides both logarithmic and linear count rate modes. If your application requires logarithmic display or a wider dynamic range in log format, the 449 is the appropriate model.
Government labs don't retire equipment early - this module logged real counts in a real facility before it came here. Plug it into your NIM bin and find out what it still knows.
