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Model 6037, 8-Channel Strain/Bridge Transducer Amplifier-Filter-Digitizer



Features

  • Programmable input configuration, 1/4, 1/2 & full bridge
  • Automatic gain ranging
  • Strain gage simulation resistor
  • Excitation up to 12 Volts, regulated per channel
  • Automatic balance & zero
  • Voltage & bipolar shunt calibration
  • Four frequency programmable low-pass filter
  • Up to 10kS/s per channel with 16-bit resolution
  • Two alarms with programmable upper & lower limits

Description

The 6037 has eight channels of strain gage or transducer signal conditioning amplifiers and digitizer. Each channel has programmable voltage excitation, programmable bridge completion and automatic balance, programmable gain instrumentation amplifier, four-pole low-pass filter and sample and hold amplifier. The amplified channel outputs are multiplexed and digitized to 16 bits then provided to the 6000 data bus.

The 6037 is designed for use with strain gages employing a 3-wire connection. It may also be used with 1/4, 1/2, and full bridge transducers, potentiometers and low-level voltage signals. Excitation is programmable from 0 to 12 Volts for each channel. Individual excitation regulators and careful routing of power traces and grounds results in less than 0.01% effect due to loading or a short on other channels. A calibration mode is provided for accurate measurement of excitation voltage.

A gage substitution resistor may be employed to determine and compensate for strain gage desensitation due to input line losses. Shunt calibration is provided for for the strain gage or transducer, gage substitution resistor and completion resistor. PI660 software contains calculators that determine line resistance based on shunt measurements and gage resistance and compensate for gage desensitation.

The input may be configured for strain gage, transducer or voltage and has ±50 Volts differential and ±30 Volts common mode protection. The differential instrumentation amplifier has programmable gains from 1 to 5,000 providing full scale input ranges of ±2mV to ±10 Volts. Voltage substitution provides the means to improve measurement accuracy and make data NIST traceable. Using PI660 software measurement data can be corrected in real time to eliminate gain and zero errors providing accuracies in the 0.025% to 0.05% range.

Automatic gain ranging may be user selected and scales the input sensitivity to the signal level. It can eliminate the tedious task of determining the gain to use for each channel. It prevents lost data by automatically up or down scaling gain when the output is above or below threshold levels.

Both up and down gain scaling levels are programmable. To prevent erroneous scaling the user may program a delay that prevents a gain change until the output has violated the threshold for a specified number of samples or period of time.

The low-pass, anti-alias filter has four programmable bandwidths to accommodate multiple sample rates. In addition to the digitized output there is a continuous, high-level analog output for each channel. Two alarms with programmable upper and lower limits provide operator warning and digital outputs in response to limits violations.

Benefits of Automatic Gain Ranging

Automatic gain ranging can save considerable setup time and provide the highest signal to noise ratio by insuring that the output level is the highest possible without overscale. Further, it prevents data loss by reducing the gain for channels that go into overscale.

The user has full control to enable or disable autoranging and set the autoranging parameters. Gain ranges down when the high limit is reached in the positive or negative direction and the high-limit persistence time elapses. Both the limit and persistence are programmable. Gain ranges up when the low limit is reached in the positive or negative direction and the low-limit persistence time elapses. Upper and lower limits and their persistences are independently programmable.

Gain for each channel is read and recorded by including phantom channels 8 and 9 in the scan list. A four-bit binary code identifies one of the sixteen possible gain steps that corresponds with the digitized data for each channel PI660 has a text display of gains.

When using automatic gain ranging it is important that all gain steps be gain and offset calibrated for highest accuracy. PI660 software performs this calibration providing NIST traceability.






Overview  · Input  · Excitation/Transducer Power  · Amplifier  · Automatic Gain Ranging  · Filter  · Digitizer  · Calibration  · Mechanical  · Ordering Information 

Overview

Measurement Type

Bridge
Strain Gage

Analog Bandwidth

1 kHz

Excitation/Transducer Power

Voltage

Filter

4-Pole
6-Pole

8-Pole

Sample Rate (Digitizer)

Up to 10 kS/s

Analog Output

Monitor Output


Input

Configuration

8 channels, 2 to 4 wires plus shield for bridge and voltage. Programmable completion for 1/4, 1/2 and full bridge.

Balance

Automatic by program control. Balance accuracy ±0.05% of range, ±1 mV RTO. Stability ±0.02% for 8 hours, ±0.005 %/ºC. Installed range resistor provides 20 mV/V for a 120 Ohm gage or bridge.

Impedance

50 Megohms, shunted by 1,000 pF.

Protection

±50 Volts differential, ±30 Volts common mode.


Excitation/Transducer Power

Voltage Excitation

Programmable for each channel from 0 to 12 Volts in 1 Volt ±0.1% steps with 3.3 mV resolution fine adjustment.

Current

50 mA, limited to 70 mA. A short on one channel has less than ±0.01% affect on other channels.

Regulation

±0.2% line and no-load to full-load measured at the input connector.

Stability

±0.01%, ±0.005 %/ºC

Excitation Noise

200 µV peak-to-peak.

Calibration Mode

Voltage monitor, ADC and analog output.


Amplifier

Gain

Programmable 1 to 5000, in 1, 2, 3, 5 steps, with ±0.05% accuracy.

Gain Stability

±0.01%, ±0.004%/ºC.

Linearity (Amplifier)

±0.01% for gains < 1,000, ±0.02% for gains 1,000 and higher.

Common Mode

60 dB plus gain in dB up to 106 dB, DC to 60 Hz for ±10 Volts.

Zero (Amplifier)

Automatic to ±1 µV RTI, ±0.5 mV RTO.

Zero Stability

±5 µV RTI, ±1 mV RTO, ±1 µV/ºC RTI,
±0.2 mV/ºC RTO. Short term: ±2 µV RTI,
±0.4 mV RTO for 8 hours.

Source Current

±5 nA, ±0.1 nA/ºC

Noise (10 Hz)

0.5 µV peak, RTI.

Noise (1 kHz)

1.5 µV peak, RTI

Bandwidth

1 kHz
-3
dB

Recovery

800 µS to ±0.1% for 10X overload to ±10 V.


Automatic Gain Ranging

Selection

Program commands select initial gain and enable or disable automatic up ranging and down ranging.

Limits

User programmable upper and lower limits for gain change, 0 to 100% of full scale.

Persistence

The number of samples (down ranging) or time (up ranging) for which output must remain in violation of limit before gain change takes place. Down ranging is 1 to 128 samples, up ranging is 40 to 90,000 mS.

Gain Readback

Gain code for channels 0-3 is readback from channel 8 and channels 4-7 from channel 9. Each channel uses a 4-bits to encode the current gain.


Filter

Type

Four-pole, low-pass Butterworth.

Frequency

4 programmable frequencies: 10Hz, 100Hz, 200Hz, 1kHz.

Noise (Filter)

2 mV peak RTO

Other

Other filter characteristics and cut offs are available.


Digitizer

Sample

Simultaneous, within ±50 nS channel-to-channel. Droop is less than ±0.005%.

Resolution

16-bits, two's complement.

Sample Rate

Up to 10 kS/s per channel
Up to 10
kS/s

Digitizer Linearity

2 LSB (0.006%)

Continuity

Monotonic to 15 bits.

Alarms

Two alarms each with upper and lower limits that are programmable from negative to positive full scale. Limits checked on each ADC sample.


Calibration

Shunt

Programmable bipolar shunt. Installed resistor provides 3.0 mV/V ±0.01% for 120 Ohm gage or bridge.

Voltage Substitution

Alternate amplifier input for external voltage calibrator. Programmable attenuator steps of 1, 0.1 and 0.01 with ±0.02% accuracy. Output of the attenuator provided on rear panel connector for accuracy verification.

Zero Calibration

Amplifier input disconnected and shorted.


Mechanical

Mounting

Occupies one slot in Series 6000 enclosures.

Connectors

Input connectors are 50-pin Type D, output connectors are 9-pin Type D. Mates are supplied.

Operating Temperature

0 to +50 ºC


Ordering Information 

Ordering Information

6037 - 8-Channel Strain-Bridge with Auto Gain Ranging.
6081 - Screw Terminal Adapter.


 DOWNLOADS 

Model 6037
(PDF, 121KB)



 Complementary to Model 6037 


Model 6044
Model 6044 32-Bit Discrete Input/Output with Alarms

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