Transducer Amplifier Modules

Transducer Amplifier modules

CFBA

Carrier Frequency Bridge Amplifier type 677

The HSE CFBA Carrier Frequency Bridge Amplifier (5 kHz) is a universal plugin module for the PLUGSYS measuring system. Together with a suitable transducer it is designed for the electrical measurement of mechanical variables such as force, pressure, displacement, acceleration etc. In multiple transducer applications, it is important that the carrier oscillators of the CFBA can be synchronized to eliminate interference. The CFBA is specially designed for transducers with AC excitation voltage like differential pressure transducers from Validyne. It can also be used with standard technique like strain gauge or field plates.

Description

Bridge supply voltage AC excitation voltage (5 kHz sinewave) internal adjustable in the range from 3 to 5 Volt.

Synchronization Switch selectable master or slave (internal).

Input voltage range 140 mVrms (Internal gain setting x10)
14 mVrms (Internal gain setting x100).

Gain 0 – 100 / 0 – 1000 or 0 – 10 000 depending on the various internal and external gain settings.
Internal Switch selectable x10 / x100
External Switch selectable x1 / x10 and continuously adjustable
through 10 turn trimmer from 0 to 100 %.

Band width 0 - 1 kHz.

Output low-pass filter 11 positions 0.01 Hz – 1 kHz selected by rotary switch.

Signal input 6-pin socket with screw lock (Binder, Amphenol-Tuchel).

Signal output 1. on front panel through BNC socket ±10 Volt (filtered output signal).
2. through bus connector to the PLUGSYS measuring system (jumper selectable) both the filtered and unfiltered output signal in the range of ±10 Volt.

Analog indication through LED bargraph + 20 LED’s / – 9 LED’s for visual check on the measurement. The sensitivity can be selected between 500 mV / LED and 50 mV / LED.

Electrical calibration 1 CAL 1 adjustable through 10-turn trimmer, negative and positive calibration voltage. The calibration signal is superimposed on the measurement signal by pressing the CAL 1 key.

Electrical calibration 2 CAL 2 selected internally through link plugs.
a) positive calibration voltage
b) negative calibration voltage
c) external calibration voltage from PLUGSYS measuring system.
The amplitude of the calibration voltage is adjustable with a 10-turn trimmer. The calibration voltage is applied on pressing the CAL 2 key. During this time the measuring signal is switched off.

Suppression SUP adjustable with 10 turn trimmer, negative and positive values. The suppression can be switched on and off with a switch.

Signal output MUX after pressing the MUX (MULTIPLEX) key the filtered signal output of the amplifier is switched for example to the input of a digital voltage meter module for accurate zero adjustment and calibration setting. The function is self-maintained; the module previously selected is switched off.

Power supply + 5 Volt, 1.1 A through main connector from the PLUGSYS bus system.

Dimensions module for 19 inch rack, width 8 E (40.4 mm), height 3 U (128.7 mm), depth Europe size (220 mm)

Connector DIN 41612, 96-pin VG

Weight 400 g

HUGO SACHS ELEKTRONIK-HARVARD APPARATUS GmbH
Gruenstrasse 1 · D-79232 March-Hugstetten · GERMANY
Phone: +49 (0) 76 65 - 92 00-0 · Fax: +49 (0) 76 65 - 92 00-90

Description
Bridge supply voltage	AC excitation voltage (5 kHz sinewave) internal adjustable in the range from 3 to 5 Volt.
Synchronization	Switch selectable master or slave (internal).
Input voltage range	140 mVrms (Internal gain setting x10) 14 mVrms (Internal gain setting x100).
Gain	0 – 100 / 0 – 1000 or 0 – 10 000 depending on the various internal and external gain settings. Internal Switch selectable x10 / x100 External Switch selectable x1 / x10 and continuously adjustable through 10 turn trimmer from 0 to 100 %.
Band width	0 - 1 kHz.
Output low-pass filter	11 positions 0.01 Hz – 1 kHz selected by rotary switch.
Signal input	6-pin socket with screw lock (Binder, Amphenol-Tuchel).
Signal output	1. on front panel through BNC socket ±10 Volt (filtered output signal). 2. through bus connector to the PLUGSYS measuring system (jumper selectable) both the filtered and unfiltered output signal in the range of ±10 Volt.
Analog indication	through LED bargraph + 20 LED’s / – 9 LED’s for visual check on the measurement. The sensitivity can be selected between 500 mV / LED and 50 mV / LED.
Electrical calibration 1	CAL 1 adjustable through 10-turn trimmer, negative and positive calibration voltage. The calibration signal is superimposed on the measurement signal by pressing the CAL 1 key.
Electrical calibration 2	CAL 2 selected internally through link plugs. a) positive calibration voltage b) negative calibration voltage c) external calibration voltage from PLUGSYS measuring system. The amplitude of the calibration voltage is adjustable with a 10-turn trimmer. The calibration voltage is applied on pressing the CAL 2 key. During this time the measuring signal is switched off.
Suppression	SUP adjustable with 10 turn trimmer, negative and positive values. The suppression can be switched on and off with a switch.
Signal output MUX	after pressing the MUX (MULTIPLEX) key the filtered signal output of the amplifier is switched for example to the input of a digital voltage meter module for accurate zero adjustment and calibration setting. The function is self-maintained; the module previously selected is switched off.
Power supply	+ 5 Volt, 1.1 A through main connector from the PLUGSYS bus system.
Dimensions	module for 19 inch rack, width 8 E (40.4 mm), height 3 U (128.7 mm), depth Europe size (220 mm)
Connector	DIN 41612, 96-pin VG
Weight	400 g