3B Scientific Measuring Amplifier S User Manual

3B SCIENTIFIC® PHYSICS

Instrumentation amplifier for student experiments 8532161

Instruction sheet

07/06 SP

1 Current measurement

input

2 Voltage measurement

input
3 Measurement output
4 Supply voltage voltage
5 Zero point calibration
6 Measuring range selector

1. Description

The instrumentation amplifier for students’ ex­periments is used in conjunction with a simple
voltmeter to measure very small voltages and cur­rents.

The device consists of an operational amplifier and
a special preamplifier, owing to which a high gain
factor (10

6

), a low offset voltage and an excellent
long-term stability can be achieved. The amplifier
is used for both AC/DC voltage and AC/DC current. A
conventional voltmeter (measuring range: 1 V DC
or 3 V AC) serves as an indicating instrument. Addi­tional calibration of the device is not required.

2. Technical data

Operating voltage: 12 V AC
Input impedance: 10 k•
Amplification factor: 10

6

Input connections: Two BNC connectors
Output connections: Two 4-mm safety con-

nectors

Primary fuse: See rear of equipment

housing

Dimensions: 175 mm × 85 mm ×

65 mm

Weight: 250 g approx.

1

3. Operation

3.1 Voltage amplifier

• Apply the supply voltage (12 V AC).

• Select the maximum measuring range (100 •A,

1 V), in order to avoid overload.

• Connect the voltmeter (1 V DC or 3 V AC).

• Connect the measurement set-up to input U.

• Select the appropriate measuring range.

3.2 Current amplifier

• Apply the supply voltage (12 V AC).

• Select the maximum measuring range (100 •A,

1 V), in order to avoid overload.

• Connect the voltmeter (1 V DC or 3 V AC).

• Connect the measurement set-up to input I.

• Select the appropriate measuring range.

Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com

Technical amendments are possible.