User Manual SMU-9000 EC DECLARATION OF CONFORMITY This apparatus, when installed and operated per the manufacturer’s recommendations, conforms with the protection requirements of EC Council Directive 89/336/EEC on the approximation of the laws of the member states relating to Electromagnetic Compatibility, as required by the Technical Construction File Route to Conformity. The Certificate has been issued in accordance with the conditions of regulation No. 53 of the U.K.
PROPRIETARY INFORMATION Any reproduction, disclosure or other use of this information is expressly prohibited except as Kaman Precision Products may otherwise agree to by writing.
Part IX: Warranty Kaman Precision Products Standard Limited Warranty Products of Kaman Precision Products are warranted to be free from defects in materials and workmanship when installed and operated in accord with instructions outlined in the instruction manual. Kaman Precision Products' obligation under this warranty shall be limited to repair or replacement (at the discretion of Kaman Precision Products of the defective goods returned to Kaman's plant within one (1) year from date of shipment.
Part I: Welcome Introduction Ka SMU-9000 measuring systems use inductive (eddy current) technology to measure position without contacting the target. SMU-9000 measuring systems are ideally suited for applications requiring high resolution and economical performance-to-price ratio. Based on Kaman’s proprietary Pulse Width Modulated electronics, the SMU-9000 systems incorporate the latest surface-mount components with printed circuit board designs.
Features Summary / Advantages • • • • • • • • Extremely high resolution, to 1Å Signal-to-noise ratio: 1 PPM Precision of 0.1% of full scale, using computer correction. Small size for efficient system integration: 2 channels in less than 5.5 cubic inches (91cc) Flexible packaging and performance. Multiple configurations available: 9000 single channel, 9200 dual or balanced differential operation, and three and four channel models. Wide range of sensor options.
SMU-9000 Configurations The SMU-9000 measuring system is available in several configurations. These configurations include: Single Channel, Dual Channel, Three Channel, and Four Channel systems shown in figures 2 through 4. The system electronics is housed in an enclosure made of die cast aluminum or poly-carbonate material. Sensors for the SMU-9000 come in a wide variety. The selection of a specific sensor is dependent upon the application in which the system is used. Figure 2.
Figure 3. Outline Drawing, 3 Channel SMU-9000 Figure 4.
Part II: Setting Up the System Power Supply Requirements The critical circuit voltages needed for operation of the SMU9000 are internally regulated. Therefore, any single ended DC voltage power supply which can furnish from 6.5 to 30 volts at 20ma per channel may be used. Note: Avoid using switching power supplies if high resolution (low noise) output is required. The output amplifier runs directly from the supply voltage (positive) and an internally generated negative voltage.
Power and Output Connections The standard SMU-9000 power and output connection consists of a one meter long shielded four-wire cable. The power and output (P/O) wires are labeled accordingly. Connect the labeled power wires from the SMU-9000 to the appropriate input supply voltage that will be used.
Sensor Installation The sensor(s) for the SMU-9000 is connected to the electronics via an SMA type connector (other types of connectors are available upon request). Connect the sensor to the unit and mount the sensor on a stable platform. Since target motion is usually the desired measurement, be sure the sensor mount provides a stable reference. A Kaman micrometer fixture is recommended (Part no.: 850854-001). A sensor installation for a standard calibration is shown below. Figure 5.
Figure 6. Offset and Measuring Range Sensor range, linearity, or stability can be degraded if the sensor or target is not carefully installed. The following precautions should be considered: SMU-9000 User Manual • Avoid “secondary or side loading” target conductors. Surrounding metal to the side or the rear of the sensor coil can inductively couple with the target currents and thereby indirectly couple to the sensor coil.
Part III: Calibration System Calibration Record All systems are factory calibrated and supplied with a record of factory testing. A calibration record, shown in figure 7, is obtained prior to shipment using a dimension standard (a micrometer fixture or laser measuring system) with a specified target material and configuration. Figure 7.
calibration process. The non-linearity of a system is calculated using the least square method which represents error from a best fit line through the data. When a specified range is less than 10% of the sensor coil diameter, a linear output of less than ±5% is usually possible. For sensors with a larger “percentage-ofdiameter” calibrated range, 5th order coefficients of the natural curvature can be provided upon request.
Interaction between the controls should decrease with each iteration. To calibrate the system: 1. Position the target at the minimum displacement from the sensor (offset distance). Adjust the “Zero” control until the system output voltage reads zero or the minimum output voltage desired. 2. Position the target at the maximum displacement from the sensor (offset distance plus full range). Adjust the “Gain” control until the system output voltage reads the maximum output voltage desired. 3.
from the target, the second sensor would therefore be positioned at minimum displacement respectively. Differential Output Measurements In a differential calibration, each channel of the SMU-9000 is calibrated individually. After calibrating each channel, a “balanced to ground” output is taken from the two the positive labeled output wires in order to display the differential output voltage. To accomplish this, connect the positive output wires to a voltmeter as shown in Figure 10.
Laser Calibration for Small Ranges The SMU-9000 can be used to measure ranges as small as 0.001 inches with precision and accuracy. For small measurements such as this, Kaman uses a laser measuring system for final calibration. Calibration using this degree of precision is recommended for ranges less than 0.004 inches.
Figure 11. Bipolar Calibration Charts (Output vs.
Basic Bipolar Calibration Method 1. Position the target at the minimum displacement from the sensor. Adjust the “Zero” control until the system output voltage reads the negative output voltage desired. 2. Position the target at the maximum displacement from the sensor. Make note of the actual output voltage reading. (The output voltage at this point will probably be greater than the desired full-scale output voltage). 3. Adjust the “Gain” control until the difference between the 4.
Part IV: System Performance Linearity and Temperature Performance Typically, the SMU-9000 will yield the best linearity performance over smaller ranges. As the measuring range is increased, the linearity of the system will decrease. For example, a sensor set up for a measuring range equal to about 5% of it’s diameter against a non-magnetic target will be about 1% non-linear.
Figure 12. Calibration Record with Polynomial correction Resolution Resolution for three typical SMU-9000 systems are shown in Figures 13, 15 and 17. Care should be taken in order to achieve the resolution desired, particularly in fixturing and filtering. The noise measurements, as a function of bandwidth, include external filtering. The graphs represent the peak-to-peak noise and peak-topeak noise per root hertz at various bandwidths as measured with a differential oscilloscope (Noise Density).
SMU 9000-15N (10KHz Bandwidth) Offset: .004” Range: .002” Output: 10V Target: Aluminum p-p noise, microinches SMU 9000-15N PN 854294-014 Resolution (Noise) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 100 1000 10000 100000 1000000 Bandw idth, Hz Figure 13. SMU 9000-15N Resolution p-p noise, microinches/root Hz SMU 9000-15N PN 854294-014 Noise Density 0.016 0.014 0.012 0.010 0.008 0.006 0.004 0.002 0.000 100 1000 10000 100000 1000000 Bandw idth, Hz Figure 14.
SMU 9000-15N 2KHz Bandwidth Offset: .010” Range: .022” Output: 10V Target: Aluminum p-p noise, microinches SMU 9000-15N PN 854609-001 Resolution (Noise) 5.0 4.0 3.0 2.0 1.0 0.0 100 1000 10000 100000 1000000 Bandw idth, Hz Figure 15. SMU 9000-15N Resolution p-p noise, microinches/root Hz SMU 9000-15N PN 854609-001 Noise Density 0.200 0.150 0.100 0.050 0.000 100 1000 10000 100000 1000000 Bandw idth, Hz Figure 16.
SMU 9000-25U W/1 KHz Low Pass Filter Offset: .040” Range: .200” Output: 10V Target: Nickel Plated Aluminum (2-3 mils of plating) p-p noise, microinches SMU 9000-25U PN 854291-004 Resolution (Noise) 8 6 4 2 0 100 1000 10000 100000 1000000 Bandw idth, Hz Figure 17. SMU 9000-25U Resolution p-p noise, microinches/root Hz SMU 9000-25U PN 854291-004 Noise Density 0.250 0.200 0.150 0.100 0.050 0.000 100 1000 10000 100000 1000000 Bandw idth, Hz Figure 18.
Applications Summary The SMU-9000 is versatile enough to satisfy the most demanding OEM performance and packaging requirements for non-contact position measuring systems in a wide range of applications. The cost effective SMU-9000 provides the user extremely high measurement performance which is customizable to the application. These are a few of the many applications where the SMU-9000 is operating today.
Part IX: Warranty Kaman Precision Products Standard Limited Warranty Products of Kaman Precision Products are warranted to be free from defects in materials and workmanship when installed and operated in accord with instructions outlined in the instruction manual. Kaman Precision Products' obligation under this warranty shall be limited to repair or replacement (at the discretion of Kaman Precision Products ) of the defective goods returned to Kaman's plant within one (1) year from date of shipment.
Customer Service Information Should you have any questions regarding this product, please contact an applications engineer at Kaman Precision Products Operations 719-6356979 or fax 719-634-8093. You may also contact us through our web site at www.kamansensors.com.
