This document is the operator manual of the PM 6669 frequency counter. The frequency counter has multiple functions, which can be used for frequency measurement, frequency counting and measuring period.
The Fluke PM 6669 is a compact, high-resolution reciprocal frequency counter designed for measuring frequencies from 0.1 Hz to 1.3 GHz. It features a large LCD display, various input options including HF-input, and optional GPIB interface for automated control. The device supports multiple measuring functions such as frequency, period, duty cycle, and RPM, with selectable measuring times ranging from 0.2s to 10s.
| Measuring Range (SINGLE) | 0.1 Hz to 16 MHz |
|---|---|
| Measuring Range (0.2, 1, 10 s) | 1 Hz to 160 MHz |
| Maximum Input Frequency | 1.3 GHz |
| Minimum Sensitivity | 200 mVrms |
Error 01 indicates a RAM memory error, Error 02 indicates a measuring logic error, Error 03 indicates an internal bus error, and Error OF indicates an overflow in the counting registers.
The counter measures from 0.1 Hz to 16 MHz in SINGLE mode, and from 1 Hz to 160 MHz when using 0.2, 1, or 10 second measuring times.
To maintain oscillator accuracy, you must use a reference frequency source with an accuracy of 3 *10-8.
You must wait one hour between removing the cover and calibrating to allow the MTCXO temperature to stabilize.