Two channels of high-performance signal conditioning amplifiers for quarter, half and full bridge transducers. May also be used for RTDs, potentiometers, dynamic strain, voltage and voltage mode (ICP type) charge transducers. Each channel has programmable voltage or current excitation, autobalance, voltage and shunt calibration, differential instrumentation amplifier, eight-pole low pass filter and two buffered, ±10 Volt wideband or filtered analog outputs. A separate AC coupled input and current source accommodates dynamic strain and voltage mode charge transducers.
The eight-wire, shielded input has dedicated shunt calibration and remote sense inputs. With remote sensing excitation voltage is regulated at the transducer negating the effect of long cables. Signal conditioning is programmable. There is no need to change components, jumpers or switch settings, just reprogram the transducer type. Two calibration resistors may each be selected to shunt either a remote bridge arm or the bridge completion resistor. Voltage substitution enables calibrating the channel using a traceable standard. Gains are programmable from 1 to 5,000 with 0.05% resolution or using calibrated gain steps. The standard filter is a four frequency, eight-pole, Bessel with plug-in resistor modules determining frequencies. Optionally available is a programmable, 4-pole Bessel filter with 1 Hz resolution from 4 Hz to 1 kHz and 3 Hz resolution from 1 kHz to 10 kHz.
The 6120 is available in two configurations: The basic 6120 has 50 kHz bandwidth and the 6120HF has 100 kHz bandwidth. Optional 4-step shunt calibration using the remote connection.
Specifications - Models 6120 & 6120HF
Unless noted specifications apply to each channel individually
Input, Bridge
Two to eight wires with shield. Programmable completion for full, half and 120 and 350 Ohm quarter bridge transducers. User may install other completion resistors. Input connector is 15-pin Type D Subminiature.
Input, ICP
Differential AC coupled input, -3 dB at .25 Hz. Adjustable 2 to 20 mA current source requires 28 VDC power option (Option PS1) in the enclosure.
Voltage Excitation
0.1 to 10.24 Volts with 2.5 mV resolution, 50 mA. Calibrated 1-Volt ±0.1% steps. Stability is ±0.01%. Line and load regulation is ±0.01% using remote sensing. Calibration mode measures excitation voltage with ±0.2% accuracy.
Current Excitation
0.1 to 51.2 mA with 12.5 µA resolution, 10 Volt compliance. Calibrated 5 mA ±0.1% steps. Stability is ±0.01%. Calibration mode measures excitation current with ±0.2% accuracy.
Balance
Automatic to ±0.05% of range ±2 mV. Range is 1 mV/V, which can be increased up to 30 mV/V. Stability is ±0.01%, ±0.005%/¡C.
Shunt Calibration
Two shunt resistors mounted in resolderable terminals. Program selection of internal or external shunt connection. Optional 4-step shunt.
Voltage Calibration
Voltage substitution with selectable attenuation of 1, 0.1 and 0.01 ±0.02%.
Input Range
±2 mV to ±10 Volts full scale. Input protected to ±50 Volts.
Gain
Programmable from 1 to 5,000 with 0.05% resolution. Calibrated steps of 1, 2, 3, 5, 10 .... 5,000 with ±0.05% accuracy.
Static Accuracy
Typically ±0.02% for gains 1 to 1,000 after calibration.
Common Mode
120 dB (balanced input) or 110 dB (350 Ohms source unbalance) at gain 1,000, DC to 60 Hz. ±10 Volts, protected to ± 50 Volts.
Bandwidth
50 kHz, -3 dB. 100 kHz, -3dB for the HF version
Standard Filter
Eight-pole low-pass Bessel filter with bandwidths of 2.5 kHz, 5 kHz, 10 kHz and 20 kHz. Alternate frequencies may be installed using plug-in resistor cards.
Filter (Option PF)
Four-pole, low pass Bessel, 4 Hz to 10 kHz programmable in 1 Hz steps from 4 Hz to 1 kHz and in 3 Hz steps from 1 kHz to 10 kHz.
Sampling
Up to 100K S/s per channel. Time correlation is ±50 nS. Up to 200K S/s for the HF version.
Alarms
Four programmable alarm levels. High and low signal peak memory.
Analog Outputs
Two buffered, ±10 Volts full scale, wideband or filtered outputs on a 9-pin Type D connector. One output is also on a 3.5 mm audio jack.
Voltage/current excitation, remote sensing
