In This Guide
xvi Operating Guide
Description of the 225 MHz Frequency Counter
The Agilent 53181A is a frequency counter capable of measuring frequencies to 225
MHz on Channel 1. Depending on which optional Channel 2 the counter contains,
this capability is extended to 1.5 GHz (Option 015), 3.0 GHz (Option 030), 5.0 GHz
(Option 050) or 12.5 GHz (Option 124). The Agilent 53181A has a frequency
resolution of 10 digits in one second.
The Agilent 53181A provides users with a GPIB measuring speed of up to
200 measurements per second, and is suitable for bench-top and ATE operation.
The Agilent 53181A basic measurement functions include Frequency, Period, Peak
Voltage, and Frequency Ratio (if Channel 2 is installed).
The Agilent 53181A includes additional measurement functions and features that are
designed specifically for manufacturing and service applications:
• 1, 5, 10 MHz external reference capability—to match customer’s house standard,
• optional ultra high, high, or medium stability oven oscillators for high accuracy
needs and lengthened calibration cycles,
• external gating,
• full math and statistics,
• automatic limit testing,
• analog display mode limit testing, and
• SCPI programming capability.
Programmable control is performed via an GPIB. The GPIB and a talk-only RS-232C
serial port are standard for the Agilent 53181A. The serial port is for printing
measured and analyzed data on serial printers, or for outputting an out-of-limit signal.
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