OVERVIEW
• DC Voltage Input: 0-5 mV to 0-1200 mV
• DC Output: 0-1 V, 0-5 V, 0-10 V, +/- 5 V, +/- 10 V, 4-20 mA, etc.
• Strain Gauge Bridge Excitation: 1 to 10 VDC
• Field-Configurable by User
The APD 4059 accepts an input from one to four strain gauges, bridge type sensors, load cells, or pressure transducers. It filters, amplifies, and converts the resulting millivolt signal into the selected DC voltage or current output that is linearly related to the input.
The full 3-way (input, output, power) isolation makes this module useful for ground loop elimination, common mode signal rejection or noise pickup reduction.
The adjustable excitation power supply generates a stable source of voltage to drive from one to four 350 Ω (or greater) devices. Sense lead circuitry is included to cancel the effects of leadwire resistance, if required.
Input, output, excitation and zero offset are field configurable, via external rotary and slide switches. Offsets up to ±100% of span can be used to cancel sensor offsets or non-zero dead weights (taring). Non-interactive zero and span simplifies calibration.
Options:
TECHNICAL SPECIFICATIONS
Strain Gauge Input Ranges
Minimum range: 0 to 5 mV
Maximum range: 0 to 400 mV
Minimum sensitivity: 0.5 mV/V
Maximum sensitivity: 40 mV/V
Millivolt output range is determined by the sensitivity of the sensor (mV/V) and the excitation voltage applied.
mV/V sensitivity X excitation voltage = total mV range
Input Impedance
200 kΩ typical
Common Mode Rejection
100 dB minimum
Calibration Resistor Options
M01 option: Switch with calibration resistor inside module. Specify resistor value.
M02 option: Switch for external (load cell) calibration resistor.
Excitation Voltage
Maximum output: 10 VDC maximum at 120 mA
Drive capability: Up to four 350 Ω bridges at 10 VDC
Fine adjustment: ±5% via multiturn potentiometer
Stability: ±0.01% per °C
DC Output Ranges
Minimum Maximum
Voltage: 0-1 VDC 0-10 VDC (10 mA max)
Bipolar Voltage: ±5 VDC ±10 VDC (±10 mA max)
Current: 0-2 mADC 0-20 mADC
20 V compliance, 1000 Ω at 20 mA
Output Ripple and Noise
Less than 10 mVRMS ripple and noise
Linearity
Better than ±0.1% of span
Ambient Temperature Range and Stability
–10°C to +60°C operating ambient
Better than ±0.02% of span per °C stability
Response Time
70 milliseconds typical (14.3 Hz)
DF option: 10 millisecond response time typical (100 Hz)
Contact factory for custom response times
