Interface BSC4A 4 Channel Measuring Amplifier Instruction Manual

: June 14, 2024
: Interface

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BSC4A 4 Channel Measuring Amplifier
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BSC4A 4 Channel Measuring Amplifier
Instruction Manual

BSC4A 4 Channel Measuring Amplifier

4-channel strain gage measuring amplifier BSC4A

4mV/V, 2 mV/V, 1mV/V, 0.5mV/V configurable via jumpers
Output signals ±10V AND 12mA+-8mA on 15 pin Sub-D
Integrated half and quarter bridge completion for 350-ohm strain gage
Tare function individually via control cables and together via control cables and switches

Description
The measuring amplifier BSC4A is a measuring amplifier with 4 independent channels for sensors with strain gages such as force sensors, torque sensors, acceleration sensors or extension sensors.
This measuring amplifier is also suitable for connecting strain gage full and half bridges from 87.5 ohm to 5000 ohm and strain gage quarter bridges with 350-ohm. The measuring amplifier BSC4A is supplied with a plug-in 18V power supply and SUB-D mating plugs.
The voltage and current outputs are at the 15-pin Sub-D socket and one ground for each analog output. Both outputs have been calibrated and can be used at the same time.
The sensor inputs, bridge competitions and the inputs for automatic zero adjustment of the individual channels are at the 37-pin Sub-D socket.
The bridge completion resistance with 0.1% tolerance for 350-ohm strain gage is maintained. The quarter or half bridge mode can be set by the customer at the 37-pin Sub-D socket (see wiring diagram for 37-pin Sub-D socket).
As an option, it is possible to use the 6-wire technology. The use of 6-wire technology must be configured to the circuit board so this is a separate request that must be made at time of purchase.
BSC4D M12 socket variant
The BSC4D M12 is optionally equipped with round connectors for the sensor connection. Wiring diagram for 5-pin socket M12x1, type 763

| 5-pin| Description| Color code for cable
---|---|---|---
2| -Us negative bridge power supply| white| white
I| +Us positive bridge power supply| brown| brown
3| +UD positive differential input| green| blue
4| -UD negative differential input| yellow| black
View of socket side| 5| AUX connected to quarter bridge 350 ohm (QB)| grey| grey

Six-wire technology is not possible for M12 socket variant.
In quarter bridge and half bridge mode, the internal half bridge completion must be activated via the solder bridge on the circuit board (also possible in the factory as a free order option).
Wiring diagram for output socket 15-pin Sub-D socket

Socket Spring contacts| BSC4A assignment| 15-pin SUB-D (PIN No.)
---|---|---
(Top view)| GNDio| 1 black
Zero-point adjustment (joint)| 8 purple
Supply voltage| 9 gray
| Channel 1| Channel 2| Channel 3| Channel 4
Output voltage| 2 brown| 5 yellow| 15 red-white| 12 light green
Output current| 3 red| 6 green| 14 brown-white| 11 pink
Ground| 4 orange| 7 blue| 13 black-white| 10 white

The colors correspond to the core colors of the supplied 3-meter cable with 15-pin connector SubD15.
Automatic Zero Adjustment
Automatic Zero-adjustment is operated via push button or via digital input. Advice: the GNDio PIN 1 for digital input with PIN 8 is isolated from analog Ground PIN4. Analog grounds PIN4, PIN7, PIN13, PIN10 are connected.
Connect GNDio (PIN1) permanently with Ground (PIN4) and connect Supply Voltage (PIN9) via Relays or button with PIN8 for remote-controlled zero adjustment.

GNDio for digital input	black, 1
Zero-adjustment input Supply	purple, 8
Voltage output	grey, 9

The colors correspond to the core colors of the supplied 3-meter cable with 15-pin connector SubD15.
Wiring diagram for 37-pin Sub-D socket 37-pin Sub D, female Terminal assignment 37 pin Sub D, female

| BSC4A assignment| 37-pin SUB-D (PIN No.)
---|---|---
GND| Ground/shield| 1
| | Channel
1| Channel
2| Channel 3| Channel 4
+Us| positive sensor power supply| 20| 2| 11| 29
+UF| positive sensor input| 21| 3| 12| 30
+Up| positive differential input| 22| 4| 13| 31
QB350| quarter bridge completion 3500 1)| 23| 5| 14| 32
HB| half bridge completion 2)| 24| 6| 15| 33
-Up| negative differential input 2)| 25| 7| 16| 34
-UF| negative sensor input| 26| 8| 17| 35
-Us| negative sensor power supply| 27| 9| 18| 36
Tare| automatic zero-point adjustment| 28| 10| 19| 37

Half bridge completion must be activated at the same time.
The negative differential input ( 25, 7,16, 34 ) must be connected to the corresponding half bridge completion ( 24, 6,15, 33 ).

The automatic zero-point setting is done via push buttons or via the digital input. PIN 28 or 10 or 19 or 37. Note: The GNDio PINs for the automatic zero adjustment are separated from the analog ground. Permanently connect GNDio (PIN1) to the ground of the supply voltage and connect the supply voltage, but at least 3.5V with PIN 28 or 10 or 19 or 37 for remote zero setting.
Wiring diagram of a full bridge to Sub-D-37, channel 1-4 Wiring diagram of a half bridge to Sub-D-37, channel 1-4 Wiring diagram of a quarter bridge to Sub-D-37, channel 1-4 Wiring diagram for a full bridge M12 variant Wiring diagram for quarter bridges and half bridges M12 variant

Please note:
For quarter and half-bridge operation, the internal half-bridge supplement must be activated by solder bridges on the printed circuit board (also possible at the factory).
Adjusting the sensitivity
The sensitivity of channels 1 to 4 can be adjusted. On the circuit board of the BSC4A, each channel has a jumper post field with 4 plug options in total. Opening the device

All 4 screw covers and the fastening screws on each end cover should be removed.
The cover with the (37-pin Sub-D socket) must be loosened using the two hexagonal bolts.
The circuit board is unplugged from the side of the 15-pin Sub-D socket.
In the M12 socket version, the cover is pushed through the housing slightly slanted.

Technical data

Version	BSC4A	Unit
Accuracy class	0.1	%
Measurement range configurable by jumper	±4; ±2 ±1.0; ±0.5	mV/V
Connectible full bridge	87..5000
See note limit below*	ohm
Bridge supply voltage	5	V
Input impedance	>20 / 300pF	Mohm
Linearity deviation	<0.02	% of unit

Max. 2 channels can be operated with minimum sensor load of 87 ohm. The other 2 channels can be loaded with minimum 350 ohm. If the current outputs cannot be used, all channels with a minimum sensor load of 120 ohm can be operated. This limit is necessary for reasons of thermal stability.
Dimensions BSC4A M12 Dimensions BSC4A SubD37 Warranty
All instrument products from Interface Inc., (‘Interface’) are warranted against defective material and workmanship for a period of (1) one year from the date of dispatch. If the ‘Interface’ product you purchase appears to have a defect in material or workmanship or fails during normal use within the period, please contact your Distributor, who will assist you in resolving the problem. If it is necessary to return the product to ‘Interface’ please include a note stating name, company, address, phone number and a detailed description of the problem. Also, please indicate if it is a warranty repair. The sender is responsible for shipping charges, freight insurance and proper packaging to prevent breakage in transit. ‘Interface’ warranty does not apply to defects resulting from action of the buyer such as mishandling, improper interfacing, operation outside of design limits, improper repair or unauthorized modification. No other warranties are expressed or implied. ‘Interface’ specifically disclaims any implied warranties of merchantability or fitness for a specific purpose. The remedies outlined above are the buyer’s only remedies. ‘Interface’ will not be liable for direct, indirect, special, incidental or consequential damages whether based on the contract, tort or other legal theory. Any corrective maintenance required after the warranty period should be performed by ‘Interface’ approved personnel only.

Interface Inc.
7418 East Helm Drive, Scottsdale, Arizona 85260 USA
www.interfaceforce.com