Option package consists of a board in the A, a ribbon cable and a board for the Fluke A IEEE Translator. The 1 A must be used to interface A. Fluke A Benchtop Timer/Counter. A broadband continuously variable, x, analog attenuator lets you add just enough attenuation to minimize the input. Here you will find a large selection of new and used Fluke A listed at special prices. Although some items match several categories, all of them are listed.

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An illustrated functional approach to Period Average measurement is provided in Figure This function can be used to measure the period of an input signal with frequencies from 5 Hz through 1 MHz.

Fluke 7250A Timer Counters

Bottom range 10 kHz – 0. When using any function that counts events, the instrument must trigger once, and only once for each event. Fuke remove the bail, compress either of its legs toward the center of the case and pull out. Alternately, a photo- electric transducer will provide an output level not dependent on frequency.

During event timing functions, an internal oscillator frequency is counted for a period determined by the input signal. Option is a temperature compensated crystal oscillator TCXO with an intrinsic stability greater than the standard time base. The continuous reading mode is thereby enabled. The ambiguity amounts to one displayed count. Read this information before attempting to operate the unit.


The relationship between the two measurement functions is shown in Figure Period Test In the XI position, each input is applied directly to the Signal Conditioner; in the XIO position, each input is first applied through the attenuation network in the Signal Conditioner.

NOTE When dealing with low frequencies, period measurements yield greater accuracy. Repeat steps 4 and 5this time at a setting of kHz. The level of flluke triggering point, with respect to zero volts, is determined by the position of the Offset control. Some of the effects 7250 crystal related time base errors can be reduced.

Use an oscilloscope to identify the presence of noise. Input and signal conditioning circuitry cannot be checked in this mode. The following descriptions detail key circuit operation in the A.

Autoranging is disabled in CPM and Table This change in the voltage divider input to U 1 A will cause the charging current to decrease to nominally 1 10 mA. The positioning of the decimal point, as determined by the range setting, will translate the displayed cycle count to units of kHz or MHz. The option uses “F” cell nicad batteries for a total capacity of 5.

Use the following procedure as a performance test. Reducing Errors due to Noise 7250x the Input Signal If Hz is measured, maximum resolution allowable will again be found at the last step, but the reading will be “I. Remove the four screws holding the battery case to the battery bracket. Time Base Accuracy Test ; Make the following additional control settings: Connect the line cord to instrument, but leave the power switch in STBY.


In the front, press down on the BNC input connectors, while gently pulling up on the case top lip. The linear operating range refers fljke the excursions of the input signal that can reliably trigger the input amplifier without distortion. Compare the display to the maximum allowable deviation in Hz presented in Flukw Check for a stable display of 0.

Fluke A Universal Counter Timer Dual Channel | eBay

The positive input is battery voltage felt on the battery side gluke Rl TP2. Follow the techniques described for Channel A. Apply a I kHz,! For example, the FREQ A function can be used to measure the precision frequency output of a flukke synthesizer, and the CPM function can be used to determine the rotational speed of a conveyor belt spindle. The click of the relay may also be heard.

COM if the start and stop signals are from the same source.