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Frequency Transducer

Frequency Transducer Type: [STE-A-5T]

STE-A_5T converts a frequency into an output signal that can serve several receiving instruments such as indicators recorders, alarm units etc. The input voltage signal is stepped down and galvanically isolated by a transformer T. The zero crossing of the signal is detected to triger a precision quartz controlled monostable circuit Q. For each cycle of the input signal, the monostable switches a highly stabilized D.C.Voltage to an amplifier A. The output of the amplifier, a constant voltage with fixed pulse width is filtered and averaged. The average signal is proportional to the frequency of the input signal. To suppress the initial range, for instance up to 45Hz a fixed voltage is subtracted. The difference is fed to a current converter C to provide a load independent d.c. Current output, which can be either bipolar or unipolar.

Features Characteristics Technical Data Block Diagram


  • Available in accuracy class index - 0.2, 0.5, & 1.0

  • Withstands wide temperature variations.

  • VA burden on CT/PT very low. - < 0.5 VA

  • Wide range of Input / Output to meet National / International requirements.

  • Comply to revised IEC 60688 (1997-10) standards.

  • Flexibility in auxiliary power supply requirements - A.C. / D.C.

  • Rugged and vibration resistant.

  • Withstands seismic test as per IEC 344-1974 for Nuclear Power Applications.

  • Available in dust proof sheet plastic enclosures suitable for Back panel / Din rail mounting.

  • Multiple outputs also available - upto 4.

  • High input / Output isolations - 4.0 KV.

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Technical Data

Measuring Range > 1 0-Hz to < 1KHz
Rated Input 10 to 660V.AC
Internal Consumption < 3VA for selfpowered.
Auxiliary Power Supply 110/240 V AC or
12/24/48/110/220V DC
Or Self Powered
Nominal Output
0-2.5, 0-5,0-10mA D.C
4-20mA D.C
10-0-10 mA DC
0-10V D.C.
Load Range (Ohms)
a) Current Output
b) Voltage Output

Max 15V/Iout
Min1K Ohms
Residual A.C. Ripple < 1% (P-P)
Overload Capacity
a) Continuous
b) Momentary

1.2 Vn, 2.0 In
2.0 Vn for 1 sec.
Accuracy Class 0.2 / 0.5 / 1.0
Response Time < 0.5 sec.
Input - output Isolation 4 KV
Operating Temperature 0 - 50°C
Impulse Voltage Test Confirms to IEC 251- 5KV having waveform of 1.2/50 microseconds.
HF Interference Confirms to IEC 255-4
Environment Condition User group II as per IEC 60688
Configuration 1-Phase
Number of output 1, 2, 3

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Block Diagram

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