EIP 545A
  USED  

The 545A Microwave Frequency Counter is an exceptional counter
at a fantastic price. A front-panel keyboard is used to enter general instructions
to the microprocessor making this an easy to use instrument which is ideal for home,
research laboratory, production, test bench or field environments.
Frequency in the range of 10 Hz to 18.0 GHz is read directly
from a 12-digit LED display which is sectionalized into GHz, MHz, kHz and Hz
making it easy for even unskilled operators to make measurements
quickly and accurately.

Features
Three input bands are standard:
Band 1 is from 10 Hz to 100 MHz (sensitivity of 25 mV rms) with 1 Mohm impedance (BNC),
Band 2 is from 10 MHz to 1.0 GHz (sensitivity of -20 dBm) with 50-ohms impedance (BNC),
Band 3 is from 1.0 GHz to 18.0 GHz
(sensitivity: -30 dBm from 1.0GHz to 12.4GHz; -25 dBm from 12.4GHz to 18.0GHz)
with 50-ohms impedance (TYPE N).
Time base crystal frequency is 10 MHz with an aging rate of <3 x 10-E07/month,
10 MHz square wave (1 V p-p minimum into 50-ohms) output is available.
Overall accuracy is ?(1 count + time base error).

Other features include
Test function (allows for front-panel diagnostics),
Sample Rate control (variable from 100 ms to 10 sec) and a
Reset control (resets display to zero and initiates new reading).