Measurement amplifier U amplifies low-amplitude measurement signals from low-resistance signal sources for measurement with any chosen voltmeter or oscilloscope. By using an external shunt resistor it is also possible to measure small currents. Offset voltages can be compensated using coarse and fine offset adjustment knobs. Amplification (gain) can be selected in ranges from 0 to 5 powers of ten. High-frequency noise or other interference signals are filtered out by means of a low-pass filter with step-wise selectable time constants between 0 and 3 seconds. The output voltage has the same sign as the input voltage.
Input resistance: 10 kohm
Output resistance: 300 ohm
Offset voltage drift: < 2 μV/K (after 15 mins.
operation approx.)
Gain factors: 100; 101; 102; 103; 104; 105
Tolerance for gain factors: < 2.5 %
Input voltage: max. ±12 V
(overload protected for
brief transients up to 100 V)
Output voltage: 0 … ±12 V
(short-circuit protected)
Power supply (via
plug-in supply provided): 12 V AC
Ambient temperature: 5°C … 23°C … 40°C
Storage temperature: -20 … 70°C
Relative humidity: <85%
no condensation
Operational alignment: Horizontal
Contamination level: 2
Protection class: IP20
Dimensions: 170x105x50 mm3 approx.
Weight: 335 g approx.
Measurement and frequency ranges (relative to 1 V output voltage)
| Gain | Input voltage | Current through RShunt = 100 ohm |
Frequency |
| 100 | 1 V | 10 mA | 0 … 25 kHz |
| 101 | 100 mV | 1 mA | 0 … 25 kHz |
| 102 | 10 mV | 100 µA | 0 … 25 kHz |
| 103 | 1 mV | 10 µA | 0 … 20 kHz |
| 104 | 100 µV | 1 µA | 0 … 7 kHz |
| 105 | 10 µV | 100 nA | 0 … 7 kHz |
Cut-off frequency for switchable low-pass filter
| Time constant | Cut-off frequency |
| 0.0 s | See Table 1 |
| 0.1 s | 1.6 Hz |
| 0.3 s | 0.5 Hz |
| 1.0 s | 0.16 Hz |
| 3.0 s | 0.05 Hz |
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