Daytronic Corporation - 4000 Series Frequency Instrument

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Frequency Instrument

Model 4040

The single-channel Model 4040 is used for measurement of flow, rpm, and other phenomena that can be sensed by pulse transformer transducers with two-wire isolated windings (tachometer pickups, turbine flowmeters, etc.), transistor or logic-circuit drivers, "zero-velocity" (true digital output) sensors, and similar frequency-generating transducers.

This instrument accepts an exceptionally wide range of waveshapes and voltage levels. Its analog-input threshold level is selectable to accommodate signals from 250 mV to 100 V, thus guaranteeing reliable triggering when the input is at the low end of the frequency range.

Capacitive coupling of 0.1 μF and/or 10 μF is provided for low-frequency inputs, to eliminate false triggering by signal noise or any DC offset (positive or negative) that exists for the frequency signal. For "zero-velocity" sensors, nominal ą5 VDC excitation is supplied.

When you know the manufacturer-supplied full-scale rating of the frequency source (or the highest frequency expected to be measured), the Model 4040 can be quickly and easily calibrated by issuing a special FREQUENCY CALIBRATION (FRQ) command through the Interface Port or optional Model 10P80D Extended Keyboard. A precise 2.048000-MHz crystal frequency reference ensures accuracy of all calibrations.

Functions Provided by the
MODEL 4040 "STANDARD CONFIGURATION"

(for a complete listing of the configuration, click here)

	A preprogrammed tare function may be activated by front-panel button
	Via front-panel buttons, you can call to display the "live" tared input; the maximum (most positive) value of that input since last reset; the minimum (least positive) value of that input since last reset; or the existing net difference between these maximum and minimum values
	The "MAX" and "MIN" functions can be reset by a front-panel button
	Each of the standard seven predefined limit zones of the tared input reading is tied to a specific nonlatching logic output
	The 4040's ą10 VDC analog output derives from the tared analog input, and is initially scaled for 1 mV of output per 10 Hz

For a 4000 Series instrument based on both the Model 4040 and the Model 4078 AC Strain Gage Instrument, and dedicated to the measurement of torque, rpm, and horsepower, see the Model 4K/HP Horsepower Instrument.

For typical 4040 operations, see the following applications:

	Mass Flow Measurement (with Model 4010)
	Measuring Amount of Conveyed Material (with Model 4077)

Frequency Instrument Specifications [Top ] (Click here for 4000 Series General Specifications; see also the statement on Daytronic accuracy specifications)
Number of Inputs	One
Input Type	Any AC or unipolar pulse signal, grounded or floating, irrespective of waveform
Frequency Range	From 5% to 100% of 250, 500, 1000, or 2000 Hz; from 2% to 100% of 4, 8, 16, or 32 Hz
Threshold Level	Selectable to accommodate signals from 250 mV to 100 V
Excitation Supplied (for "Zero-Velocity" sensors)	Nominal ą5 VDC; ą50 mA maximum
Normal-Mode Range	ą100 V operating; ą200 V without instrument damage
Common-Mode Range	ą100 V operating and without instrument damage
Common-Mode Rejection Ratio	-120 dB at 60 Hz; -60 dB at 1 kHz
Input Impedance	Differential: 400 kΩ Common-Mode: 100 kΩ
Offset	Initial: ą0.05% of full scale Vs. Temperature: ą25 ppm/°C Vs. Time: ą20 ppm/month
Gain Accuracy	ą0.02% of full scale ą 1 count LSD
Gain Stability	Vs. Temperature: ą40 ppm/°C Vs. Time: ą20 ppm/month
Analog Filtering
Filter	5-pole modified Butterworth, with characteristics selectable as "1," "2," or "3," as follows: (1) -3 dB at 10 Hz; -60 dB at 75 Hz (2) -3 dB at 5 Hz; -60 dB at 35 Hz (3) -3 dB at 2.5 Hz; -60 dB at 20 Hz
Step Response Settling Time (Full-Scale Output)	(1) To 1% of final value: 40 ms To 0.1% of final value: 90 ms To 0.02% of final value: 150 ms (2) To 1% of final value: 65 ms To 0.1% of final value: 135 ms To 0.02% of final value: 220 ms (3) To 1% of final value: 150 ms To 0.1% of final value: 30 ms To 0.02% of final value: 450 ms
Ripple and Noise	Readings are within the stated accuracy from (1) 30% to 100% of the frequency range in use (2) 15% to 100% of the frequency range in use (3) 10% to 100% of the frequency range in use

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