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 reversal 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

Housing

Modules for DIN-Rails

Type Output Power Supply Range
FVM 70 V 21-30V/±15V fixed
FVM 82 0/4-20mA 21-30V fixed
FVM 70-K V 21-30V/±15V progr.
FVM 82-K 0/4-20mA 21-30V progr.


Housing

Printed Circuit Board/Euro-Card Modules

Type Output Power Supply Range
SIGF 10 V 14-30V/±15V fixed
SIGF 32 0/4-20mA 17-30V fixed
SIGF 10-K V 14-30V/±15V progr.
SIGF 32-K 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 rear 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

FrequencyDIL-Switch
Hz123456
100.000ononononoffoff
125.000ononoffonoffoff
140.625onoffononoffoff
156.250onoffoffonoffoff
166.667offonononoffoff
187.500offonoffonoffoff
200.000onononoffonon
208.300offoffononoffoff
225.000offoffoffonoffoff
250.000ononoffoffonon
281.250onoffonoffonon
312.500onoffoffoffonon
333.333offononoffonon
375.000offonoffoffonon
400.000onononoffonoff
416.000offoffonoffonon
450.000offoffoffoffonon
500.000ononoffoffonoff
562.500onoffonoffonoff
625.000onoffoffoffonoff
666.667offononoffonoff
750.000offonoffoffonoff
800.000onononoffoffon
833.333offoffonoffonoff
900.000offoffoffoffonoff
1,000.000ononoffoffoffon
1,125.000onoffonoffoffon
1,250.000onoffoffoffoffon
1,333.333offononoffoffon
1,500.000offonoffoffoffon
1,600.000onononononon
1,666.667offoffonoffoffon
FrequencyDIL-Switch
Hz123456
1,800.000offoffoffoffoffon
2,000.000ononoffononon
2,250.000onoffonononon
2,500.000onoffoffononon
2,666.667offononononon
3,000.000offonoffononon
3,200.000onononononoff
3,333.333offoffonononon
3,600.000offoffoffononon
4,000.000ononoffononoff
4,500.000onoffonononoff
5,000.000onoffoffononoff
5,333.333offononononoff
6,000.000offonoffononoff
6,400.000ononononoffon
6,666.667offoffonononoff
7,200.000offoffoffononoff
8,000.000ononoffonoffon
9,000.000onoffononoffon
10,000.000onoffoffonoffon
10,666.667offonononoffon
12,000.000offonoffonoffon
12,800.000onononoffoffoff
13,333.333offoffononoffon
14,400.000offoffoffonoffon
16,000.000ononoffoffoffoff
18,000.000onoffonoffoffoff
20,000.000onoffoffoffoffoff
21,333.333offononoffoffoff
24,000.000offonoffoffoffoff
26,666.667offoffonoffoffoff
28,800.000offoffoffoffoffoff

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