Products > Integrated Conditioning Acquisition & Control Systems > Integrated Conditioning Acquisition & Control System I/O Modules > 6000 Series Digital I/O Modules > Model 6048  
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Model 6048, 4-Channel 32-Bit Frequency/Period/Counter


  • Four independent 32-bit channels
  • Digital or zero crossing triggers
  • Optic isolated inputs
  • Noise reduction input filters
  • Programmable time base
  • 12 Volt isolated power for inputs
  • Companion Calibration Relay Matrix


The 6048 is a four-channel input module for use with tachometers, flowmeters and other transducers that have frequency outputs. It can also measure the period between events and count or totalize events. Digital measurement of frequency provides the highest accuracy. Much better, for example, than-voltage-to frequency converters.

The 6048 has optic isolated trigger, pause and reset inputs and may be triggered by input waveforms from 100mV to 100 Volts at zero crossings. It can measure frequency to 500 kHz, period down to 100 uS and count events to over 4 billion.

The 6048 has numerous programmable operating modes available, which include frequency measurement, period measurement, and pulse counting. Other programmable features incorporated in the Model 6048 are time base, number of measurement periods, and counter reset mode. The frequency, period, and pulse count measurements can be from either optic isolated digital inputs or a zero crossing detector. The counters can be reset by external inputs or automatically after each reading. Power is provided for transducers requiring 12V or for using the optic isolated inputs with external contacts.

Using digital measurement techniques, the 6048 does not have analog outputs. An analog voltage proportional to frequency can be obtained by using the 6042 DSP to scale the 6048 measurement and convert it to analog using digital-to-analog converters. This provides the accuracy of a digital measurement with the analog output of a frequency to voltage converter.

Overview  · Digital Inputs (Optic Isolated)  · Analog Inputs (Zero Crossing Detector)  · Outputs  · Range  · Accuracy  · Time Base  · Isolated Power  · Signal Inputs/Outputs  · Calibration Input  · Relay Performance  · Mechanical  · Specifications  · Ordering Information 


Measurement Type


Digital Inputs (Optic Isolated)

Level (Digital Inputs (Optic Isolated))

Requires 5 Volts at 8 mA to trigger the optic coupled input. Inputs are protected to ±50 Volts.


300 V

Frequency (Digital Inputs (Optic Isolated))

DC to 500 kHz

Analog Inputs (Zero Crossing Detector)



Level (Analog Inputs (Zero Crossing Detector))

100 mV minimum to 100 Volts maximum.


100K Ohms

Frequency (Analog Inputs (Zero Crossing Detector))

DC to 100 kHz





Output as two 16-bit data words on adjacent output ports.


Frequency (Range)

0.1 Hz to 500 kHz

Period (Range)

100 µS to over 11 million hours.

Count (Range)

0 to 232


Frequency (Accuracy)

0.01%, ±1 count.

Period (Accuracy)

0.01% down to 1 mS, 0.1% down to 100 µS.

Count (Accuracy)

±1 count

Time Base


0.1 Hz, 1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz, 1 MHz, 10 MHz.




1 or 10

Isolated Power


12 V


1 Amp maximum.

Signal Inputs/Outputs

Number (Signal I/O)


Configuration (Signal I/O)

Two-wire with shield.

Calibration Input

Configuration (Calibration Input)

Two-wire. Signal inputs may be switched individually to the calibration input by program instruction.

Relay Performance

Capacity (Relay)

1 Amp, 30 VDC or 0.5 Amp, 125 VAC (resistive load).

Operating Time (Relay)

3 ms



Occupies one slot in Series 6000 enclosures.


0 to +50 ºC


Up to 95% without condensation. %



50-pin, Type D. Connector is mounted on the front and the mate is supplied.

Ordering Information 

Ordering Information

6048-4-Channel, 32-bit frequency/period/counter module.


Model 6048
(PDF, 90KB)

 Complementary to Model 6048 

Model 6042
Model 6042 DSP Control Processor with Analog-Digital I/O

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