Digital Frequency-Voltage Transducer, FVM 70/82

General Description

These transducers convert a frequency signal of any form and polarity into a normalised voltage or current signal (e.g., 0-10 V or 4-20 mA). The measurement range is selected via DIL-switches on the back of the unit. The standard version has 64 calibrated ranges from 0-100 Hz to 0-28.8 kHz.

Special versions are available for low frequencies (FVM70/82 – L). The measuring range can be selected via DIL-switches in steps of 0.1 Hz between 0-0.1 Hz and 0-12.7 Hz or in steps of 1 Hz between 0-1 Hz and 0-127 Hz. The analog output signal is completely ripple-free.
Version FVM70/82-2L allows the adjustment of the measuring range in steps of 10 Hz between 0-10 Hz and 0-1270 Hz. The analog output signal is completely ripple-free.

• For flow measurement and other frequency signals
• Digital frequency to voltage conversion, extremely accurate
• Schmitt-trigger input protects against interference, AC-coupling
• Low frequency versions, ranges down to 0-0.1 Hz, ripple-free output signal
• Control LED on units with 24 V power supply
• Different housings available

Overview

	Modules for DIN-Rails
Type	Output	Power Supply	Range
FVM 70	V	21-30V/±15V	progr.
FVM 82	0/4-20mA	21-30V	progr.

	Printed Circuit Board/Euro-Card Modules
Type	Output	Power Supply	Range
SIGF 10	V	14-30V/±15V	progr.
SIGF 32	0/4-20mA	17-30V	progr.

Output

• Voltage output (e.g., 0-10 V): typ. 50 Ohm output impedance, max. 5mA.
• Current output (0/4-20 mA): 300 Ohm max. load, when ordering please indicate if 0-20 mA or 4-20 mA.

Power Supply

• Requires a bipolar power supply (e.g., ±15 V) for a negative output voltage. Units with a unipolar supply (standard version) have a min. output voltage of ca. 20 mV. Current requirement with no load ca. 10 mA.

Range

• 64 calibrated ranges (error < 0.1%) between 0-100 Hz and 0-28,800 Hz can be selected via DIL-switches on the back of the unit (intermediate values set by a potentiometer).

When ordering, please specify

• module type
• accuracy class (A, C, or D)
• input range (in Hz)
• output range (in mA or V)
• supply voltage (in V, uni- or bipolar)
• Only the module type and accuracy class (A or C) has to be specified for programmable versions

Operating Instructions

Range Setting Table

Other output voltages and currents: In the standard module, the output is 0-10 V, 0-20 mA or 4-20 mA. If a different output range is required, e.g., 0-1 kHz = 0-2 V, one must calculate the corresponding measurement range for 0-10 V, i.e., in the above example 0-5 kHz = 0-10 V. When this range is selected one automatically obtains 0-1 kHz = 0-2 V. The rule is: always convert first to 0-10 V (or 0-20 mA or 4-20 mA).

Detailed Data Sheet

Data sheet FVM 70/82