The ME 520-AJ is an amplifier-conditioner for strain gauge bridge sensors. It covers all sensitivity ranges from mV/V to 30 mV/V.
Using a set of jumpers, the user can configure the sensitivity range, bridge excitation voltage, output bandwidth, voltage or F65current output type, and zero offset to implement various output functions.
A calibration notch adapted to the selected sensitivity range allows for easy gain adjustment.
Signal conditioner for strain gauge sensors
Bridge supply voltage: 10 V or 5 V
Adjustable sensitivity from 0.1 mV/V to 30 mV/V
Calibration switch from 0.1 to 10 mV/V (depending on range)
Gain and zero adjustments via front-panel potentiometers
Voltage output ±10 V or current output 0/4 – 20 mA
Linearity 0.01% of full scale
Adjustable bandwidth 2 kHz or 20 kHz max.
Power supply 18 to 36 Vdc
Capable of connecting 4 350-ohm sensors in parallel
| Sensor input | 4- or 6-wire full-bridge strain gauges |
| Strain gauge bridge impedance | 120 < Z < 10,000 ? (for 120 ?, 5 V max) |
| Bridge power supply | 10 V or 5 V, max. 60 mA |
| Sensor cable rejection | 2.10?? / ? |
| Input sensitivity | 5 ranges from 0.1 mV/V to 30 mV/V |
| Fixed zero offset | 4 ranges from ±50% to ±100% of the calibration potentiometer value |
| Adjustable zero offset | ±50% minimum |
| Calibration step | From 0.1 to 10 mV/V |
| Calibration step accuracy | 0.01% over the 1 to 3 mV/V range, 0.1% for the others |
| Voltage output | ±10 V |
| Maximum output current | 5 mA |
| Maximum output impedance | 0.2 ohm |
| Current output | 4–20 mA or 0–20 mA |
| Current output dynamic range | 0–10 V (Load resistance: 500 ohms at 20 mA) |
| Linearity | 0.01% of full scale |
| Maximum drift relative to input | < 1 µV/°C |
| Noise relative to input | < 3 µV RMS/2 kHz < 10 µV RMS/20 kHz (typical) |
| Common-mode rejection | 100 dB |
| Power supply rejection | 120 dB |
| Bandwidth | 2 kHz or 20 kHz at –3 dB (typical) |
| Operating temperature | –10 to +60°C |
| Storage temperature | –40°C to +70°C |
| DIN rail enclosure | H: 99 L: 17.5 D: 112 mm |
| Removable screw terminals | 4 x 3 terminals |
| Enclosure weight | Approximately 110 grams |
| Isolated main power supply | 24 Vdc (18 to 36 Vdc). Current consumption: 60 mA (excluding output) |
| Supply voltage isolation | Max. 1000 V DC for 1 min between 0 V and GND (output). |
| Supply voltage: 22 to 24 V DC | 5 mA |
| Supply voltage isolation | Max. 1000 V DC (60 sec) between 0 V and GND; 400 V peak between 0 V and Ground & GND and Ground |
| Variable gain | Via multiplier knob: 0 to 20,000 |
| Isolation between output and input | 400 V peak between A- (input ground) and GND output |
Design office
Precision measurement
