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| Model 161MK Bridgesensor Features n n n n Description The CALEX 161MK Bridgesensor is a complete signal conditioning system on a card designed expressly for single, half or full bridge transducers. The 161MK consists of a high performance instrumentation amplifier, user-adjustable active filter, high stability bridge supply and reference regulator in a state-of-the-art hybrid circuit. The hybrid circuit is mounted on a PC board mounting kit containing all of the required external circuitry, trimpots, etc., so that only point-to-point wiring need be made to the inputs, outputs and power to have a complete signal conditioning system up and running. An on-board trimpot with an adjustment range from +4 to +12VDC simplifies changing the bridge supply voltage. The mounting kit provides coarse and fine gain adjustment trimpots along with input and output offset adjustments, DIP switches for setting the bridge supply output and active low pass filter cut-off frequency. In addition, the board allows for mounting a quarter bridge completion resistor. Two close tracking 20k ohm half bridge completion resistors are also included in the hybrid circuit. Compact, complete and convenient Easy access to all trim adjustments Simplifies single and half bridge applications Eliminates additional wiring with bridge balance trimpot Remote sensing minimizes effects of bridge supply lead resistance Adjustable filter frequency Calibration resistor for push-button calibration n n n 161MK Block Diagram ) NOTE: Board size is the same as Model 160MK except the length is 4.5 inches. Manufacturing Company, Inc. * Concord, California 94520 * Ph: 925/687-4411 or 800/542-3355 * Fax: 925/687-3333 * www.calex.com * Email: sales@calex.com 1 D-313 Model 161MK Bridgesensor Specifications Conditions (Unless Noted): Ta = 25C, Vs. = 15 VDC, G = 500 V/V P a ra m e te r Am p lifie r Gai n Range: Gai n Equati on Gai n Equati on Accuracy 2 < G < 1000 V/V Gai n C hange w/Tri mpots w/ Temperature: Ampli fi er alone Nonli neari ty, 10V Output Swi ng Offset Voltage, Input and Output Warm-up D ri ft Vs. Temperature G = 2 V/V G = 1000 V/V At other Gai ns, Max Vs. Power Supply Pi n K ti ed to Pi n B Output Offset Adjust Range Input Bi as C urrent Vs. Temperature Input Offset C urrent Vs. Temperature Input Impedance C ommon Mode Input Voltage: C MR: Input Noi se Voltage: C urrent: Rated Output: Range, Li near Response Maxi mum 1 kHz bw, D C - 60 Hz 10 Hz bw, D C - 60 Hz 0.1 Hz - 10 Hz 10 Hz - 100 Hz 0.1 Hz - 10 Hz 10 Hz - 100 Hz Voltage, 2k ohm Load C urrent Load C apaci tance Short C i rcui t Small Si gnal Bandwi dth Amp Out Gai n Bandwi dth Number of Poles D C Gai n (Pi n P to N) Roll Off w/Tri mpot w/Ext Resi stor 10 10 25 5 10 4G ohms | | 15 pF 9.5 15 140 140 0.3 1 60 100 1000 VDC dB V P-P pA P-P VDC mA pF kHz MHz V/V dB/D ec 10 12 100 0.1 0.05 0.05 0.2 40 0.1 200 6.46 6.80 20 1 5 5 Rated Performance Operati ng 15 12 12 -25 -40 70 100 18 7.14 0.2 0.5 VDC mA % %/V %/24 Hrs %/kHrs ppm/C % V P-P VD C kohms % ppm/C % 50 20 Adjustable w/External Set Resi stor Min im u m 100 2 Ty p ic a l Ma x im u m U n its V/V % 150 0.005 ppm/C % V 75 4 V/C V/V V nA pA/C nA pA/C 500 5000 Rg = 80,000/(G-2) 3 75 15 0.002 1 30 1 4 (100/G) 1 Adjustable to Zero 110 110 10 5 D ynami c Response: Low Pass Fi lter: B rid g e E x c ita tio n S u p p ly Output Adjustment Range: Output C urrent Load Regulati on I L Indefi ni te Adjustable 25 2 -2 40 4 4 0 = 0 - 100 mA Li ne Regulati on Vi n = 14.5 - 18 VD C Stabi li ty: Short Term Long Term Vs. Temperature Warm-up D ri ft Short C i rcui t Protecti on Output Noi se, 10 Hz - 1 kHz Internal Reference Voltage H a lf B rid g e C o m p le tio n Nomi nal Resi stance Value Ini ti al Accuracy Temperature Tracki ng Balance Adjustment Range P o w e r R e q u ire m e n ts Voltage: ) 8 Hours Mi ni mum 80 VDC mA C C urrent (add your bri dge exci tati on current) E n v iro n m e n ta l Ambi ent: Operati ng Storage Manufacturing Company, Inc. * Concord, California 94520 * Ph: 925/687-4411 or 800/542-3355 * Fax: 925/687-3333 * www.calex.com * Email: sales@calex.com 2 D-313 Model 161MK Bridgesensor 161MK Applications Example Figures 1 through 4 illustrate full, half and single bridge applications. The 161MK and 160MK use the same amplifier and bridge supply. See the Model 160MK on pages A40 through A48 for additional technical information. Please contact our applications engineering department if further assistance is required. FIGURE 1. Full Bridge Application ) FIGURE 2. Half Bridge 3 Wire Application Manufacturing Company, Inc. * Concord, California 94520 * Ph: 925/687-4411 or 800/542-3355 * Fax: 925/687-3333 * www.calex.com * Email: sales@calex.com 3 D-313 Model 161MK Bridgesensor C14, A 0.47F Ceramic or Mylar, may be added to reduce line frequency noise pick up. It limits frequency response to 30 CPS. FIGURE 3. 1/4 Bridge 3 Wire Compensation ) FIGURE 4. Typical 1/4 Bridge Application Manufacturing Company, Inc. * Concord, California 94520 * Ph: 925/687-4411 or 800/542-3355 * Fax: 925/687-3333 * www.calex.com * Email: sales@calex.com 4 D-313 |
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