661 Ratemeter – Ortec

The 661 Ratemeter (Ortec) measures the counting rate of randomly arriving pulses, or the frequency of periodic signals in the range of 0 to 100.000.000 counts/s (0 to 10 MHz).

661 Ratemeter features:

• flexible analog output for strip chart recorders
• positive and negative inputs
• 18 full-scale meter ranges from 25 counts/s to 100.000.000 counts/s
• adjustable positive input discriminator
• slow, medium, and fast response selections offer <1%, <3%, or <10% standard deviation in the measurement
• fast response circuit permits settling to 1% precision in a fraction of the normal time

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