9349 Log/Lin Ratemeter

• For counting rate measurements with photons or ion beams
• 10⁶ counts/s full scale
• Linear or logarithmic operation
• Fast negative NIM input

Designed for photon or ion beam applications, the ORTEC Model 9349 Log/Lin Ratemeter provides two modes of operation: linear and logarithmic. The linear mode has 11 full-scale ranges from 10 to 10⁶ counts/s in 1-3-10 steps. The 5-decade log mode covers the range 10 to 10⁶ counts/s in a single span. These choices permit optimum measurement of low, medium, or high steady pulse rates or monitoring of rates that vary through a wide range.

The input signal to the Model 9349 is normally obtained from a discriminator having a NIM-standard, fast-negative logic output signal.

Because of the longer effective scale inherent in its 240° movement and its high accuracy, the unique circular front-panel meter provides excellent readability for both modes.

Zero suppression is provided for up to 100% of any linear range. Any relatively constant background in the counting rate can be subtracted from the data by adjustment of this control. Also, a suppressed zero permits rates that are beyond the nominal full-scale limit to be observed with greater accuracy than could be obtained by switching to a higher range. The choice between 7 linear and 2 log time constants is a further aid to accurate reading of the rate of incoming signals.

In addition to the front-panel meter indications, outputs are provided for both current and voltage recorders, as well as a high-level voltage output for control or monitor applications.

ORDERING INFORMATION