MUPI-2 - Universal Signal Conditioner

MUPI-2 - Universal Signal Conditioner 

The MUPI-2 Universal Signal Conditioner is a self contained, fully functional and adjustable 

conditioning module. This compact epoxy encapsulated package contains all the electronics and 

interface circuitry required, to operate any Spectron single axis electrolytic tilt sensor. Utilizing MIL 

spec components, this bipolar DC input/output operated device internally 

generates the required AC excitation voltage for the sensor, and 

demodulates the sensor output into a smooth amplified DC output 

voltage. The MUPI-2 also features zero offset / gain / symmetry 

adjustments, bifurcated/solderable terminals for easy installation, and 

vibration and shock survivability capabilities for hostile environments. Inline 

quality control during manufacturing assures maximum reliability in 

both commercial and military applications. 

General Specifications 

Input voltage .....………………………….....+/-10 to +/-16Vdc 

Input current ...…………………………....... 20mA (maximum) 

Sensor excitation .………………………..... 5V pp, square wave, 1kHz (nominal) 

Input impedance ..………………………..... 5 megohms 

Output .....………………………………...... +/-7Vdc @ +/-10Vdc input 

Linearity .……………………………........... 0.03% of full scale (maximum) 

Time constant ……………………….......... 40 msec 

Offset adjustment ...………………….….... +/-1Vdc 

Output ripple .....………………………....... 0.3% pp of output signal 

Zero adjustment range ..………………..... +/-1% of full scale output 

Symmetry and Gain adjustment ………... Individual plus (+) and minus (-) gain adjustments, 4:1 

symmetry correction 

Weight .........……………………………..... 60 grams 

Temperature coefficients (module w/out sensor) 

- Null ..........……………………... 0.02% full scale / C o 

- Scale .…………………….…..... 0.03% full scale / C o 

Temperature range 

- Operating .………………….… 25 to +70C o 

- Storage ..……………………... 40 to +80C o 

Vibration ..…………………………....... 2g, 10 - 500Hz 

Shock ......…………………………….... 20g, 11 milliseconds, 3 directions 

SPECTRON SYSTEMS TECHNOLOGY INC. 

595 OLD WILLETS PATH 

HAUPPAUGE NY 11788 

PHONE: 631 582-5600 

FAX: 631 582-5671 

Specifications subject to change without notice! 

Doc.# SDS-103-1703

MUPI-2 - Universal Signal Conditioner 

Dimensions, Electrical Connections, and Adjustments 

inches (mm) 




PHONE: 631 582-5600 

FAX: 631 582-5671 


Doc.# SDS-103-1703

MUPI-3 - Universal Signal Conditioner, temperature 

compensated 

The MUPI-3 Universal Signal Conditioner is a self contained, fully functional and 

adjustable conditioning module, with the added ability of scale factor temperature 

compensation. This compact epoxy encapsulated package contains all the electronics 

and interface circuitry required, to operate any Spectron single axis electrolytic tilt 

sensor. Utilizing MIL spec components, this bipolar DC input/output operated device 

internally generates the required AC excitation voltage for the sensor, and 

demodulates the sensor output into a smooth amplified DC output voltage. The 

temperature compensation feature reduces the overall measurement error, resulting in 

a highly accurate output. In-line quality control during manufacturing assures maximum 

reliability in both commercial and military applications. 

An internal circuit allows the sensor to be located up to 65 feet (20 meters) from the conditioning module, with little or 

no adverse effect. In addition, the power supply and/or display unit may be located up to several hundred yards or 

meters from the conditioning module, thereby allowing maximum field flexibility. Other MUPI-3 features include zero 

offset / gain / symmetry adjustments, reverse polarity protection, output overload (short circuit) protection, 

bifurcated/solderable terminals for easy installation, and vibration and shock survivability capabilities for hostile 

environments. 


Input voltage ....……………………….......+/-11 to +/-16Vdc 

Input current, no load .…………………... 8 mA (maximum, either leg) 

Sensor excitation ...…………………….... 5V pp, square wave, 1kHz (nominal) 

Input impedance .....……………………... 5 megohms 

Output .........……………………………... +/-7Vdc @ +/-11Vdc input 

Linearity …………………………............. 0.04% of full scale (maximum) 

Time constant ..……………………......... 40 msec 

Zero (null) offset adjustment …………... +/-1Vdc 

Output ripple .......………………………... 0.3% pp of output signal, 55dB 

Gain and Symmetry adjustments 

- General gain = 1 to10x via external resistor (R2, see wiring diagram) 

- Fine gain and symmetry = Individual plus (+) and minus (-) adjustments (+/-50%) 

Weight ....………………………….......... 100 grams 

Mounting .………………………….......... four through holes for M3 screws 

Vibration .………………………….......... 2g, 10 - 500Hz 

Shock .........……………………………... 20g, 11 milliseconds, 3 directions 


- Null .......…………………....... 0.02% full scale / C 0 

- Scale .………………….......... 0.03% full scale / C 0 


- Operating ………………....... -25 to +70C 0 

- Storage ..…………………..... -40 to +80C 0 

Temperature Compensation 

- Temperature compensation of the assembly (module and sensor) can be accomplished using an external silicon 

temperature sensor (KTY81-120), located as close as possible to the sensor, and an optimal value resistor (R1), 

whose value can vary depending on the particular sensors characteristics. With this configuration, it is possible to 

reduce the scale temperature coefficient error from a 0.15%/Co (nominal), to 0.02%/Co (nominal). Please see wiring 

diagram for connection points. 




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FAX: 631 582-5671 


Doc.# SDS-104-4804


compensated 

Dimensions and Adjustments 

mm (inches) 

Electrical Connections 




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FAX: 631 582-5671 


Doc.# SDS-104-4804


compensated 




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FAX: 631 582-5671 


Doc.# SDS-104-4804

Application Note 

MUPI-3 Universal Signal Conditioner 

Calibration Procedure 

Overview 

The following procedure details how to calibrate 

the MUPI-3 Universal Signal Conditioner for proper null 

(zero) output, and scale factor (gain), for a particular 

Spectron single axis tilt sensor. It should be noted that 

by performing any of these adjustments, all ‘factory 

calibration’ settings WILL be voided! 

Equipment Required 

• +/-12Vdc Power Supply 

• Digital Voltmeter 

• Tilt/Rotary Table 

*Note: the angular positional accuracy of the tilt/rotary table 

utilized should be a factor of 10X greater than the desired 

resultant calibration accuracy! 


1. Connect the tilt sensor to the MUPI-3 on terminal 

numbers 1, 2, and 3 per diagram. 

2. Connect the Digital Voltmeter to the MUPI-3 on 

terminal numbers 6 and 8. 

3. Connect the DC power supply to the MUPI-3 on 

terminal numbers 7, 8, and 9. 

4. Turn on DC power supply. Adjust to +/-12Vdc if 

necessary. 

5. Place tilt sensor in the level (null) position. Wait at 

least 20 seconds for sensor to settle. Note: sensors 

with higher fluid viscosities (i.e. damped) may require a 

longer waiting period! 

Electrical Connection Diagram 

6. Turn ‘Sensor Null Adjustment’ potentiometer until 

output on Digital Voltmeter reads 0.000Vdc (see 

below for potentiometer locations). 

SPECTRON GLASS AND ELECTRONICS INC. 



PHONE: 631 582-5600 

FAX: 631 582-5671 

Specifications are subject to change without notice! 

Doc.# SAN-214-0205


MUPI-3 Universal Signal Conditioner 


NOTE: By increasing the gain, electrical ‘noise’ will also 

increase, and other performance parameters may be 

affected. It is suggested that all performance 

specifications be subsequently verified once the gain 

has been modified. Regardless, it is not recommended 

to increase the gain above a factor of X3! 

The mathematical equation for determining the gain 

factor for a particular gain resister value is as follows. 

The following are resister values for typical gain 

increases. Once the resister has been selected and 

installed, repeat the Calibration Procedure. 

7. Rotate the tilt sensor in a clockwise direction to half of 

the desired angular measurement range. Wait at least 

20 seconds. 

8. Turn the ‘+ (plus) Sensor Gain Adjustment’ 

potentiometer to obtain half the desired output 

voltage (+3Vdc max.). 

9. Rotate tilt sensor in a counter-clockwise direction to 

half of the desired angular measurement range. Wait 

at least 20 seconds. 

10. Turn the ‘ - (negative) Sensor Gain Adjustment’ 

potentiometer to obtain half the desired output 

voltage (-3Vdc max.). 

11. Repeat steps 5 through 10, and adjust as necessary. 

Calibration is considered complete when no further 

adjustments are required. 

R2 value* Gain Factor 

100 kohm X2 

50 kohm X3 

* Resister type = metal film, 1%, 1/8 watt 

External Gain Adjustment 

The MUPI-3 is capable of providing a higher than unity 

(1) output gain, by means of an external gain resister, 

R2 (see Electrical Connection Diagram). This becomes 

useful when the total angular measurement range of a 

particular sensor will not be utilized, yet the maximum 

+/-6Vdc output is still required. 

SPECTRON GLASS AND ELECTRONICS INC. 



PHONE: 631 582-5600 

FAX: 631 582-5671 


Doc.# SAN-214-0205

SA40012 – Single Axis CMOS Signal Conditioning Module 

The SA40012 Single Axis CMOS Signal Conditioning Module is a DC input/output operated device, which operates off a 

single ended supply, and provides a bipolar DC output. Specifically designed to interface directly with all Spectron Single Axis 

Tilt Sensors, this low power consumption conditioner is ideal for battery driven applications. Featuring a PC board mountable 

design, the module internally converts the DC input voltage into an AC excitation voltage for the sensor, and demodulates the 

sensor output into a smooth amplified DC output voltage. Incorporating a proprietary signal processing algorithm, and an 

external temperature compensation sensor (optional), normal measurement errors are severely reduced. The SA40012 also 

features overload protection, and is 100% reliability tested to provide the highest quality available. 


Input voltage ...………………………........+5Vdc to +15Vdc 

Input current ........………………………... 0.5mA @ +5Vdc, 0.9mA @ +15Vdc 

Sensor excitation ..……………………..... 380 mV pp, square wave 

Input impedance .……………………....... 5 megohms 

Output .......……………………………..... +/-1.5Vdc @+6Vdc supply, referenced to VREF (pin #9, see input/output connections) 

Load ......……………………………...…. 100k ohm minimum 

Time constant .......…………………….... 30 msec 

Offset adjustment .…………………….... +/-45 mVdc 

Output ripple .....`……………………….... 0.35% of output voltage (RG 24k ohm) 


- Null ......………........ 100 microvolts / C o (typical) 

- Scale ...…………..... 0.02% / C o @ +1Vdc output 

Output short duration …………….......... Continuous (Vout and Vref) 


- Operating .………. . -20 to +70C o 

- Storage ...………. .. -40 to +80C o 


- Temperature compensation of the assembly (module and sensor) can be accomplished using an external silicon 

temperature sensor (KTY81-120) and a resistor (.RT., see wiring diagram for typical values). With this configuration, it is 

possible to reduce the scale temperature coefficient error from a 0.3%/C o (nominal), to 0.03%/C o (nominal). Please see 

wiring diagram for connection points. 

Dimensions 




PHONE: 631 582-5600 

FAX: 631 582-5671 

www.spectronsensors.com 


Doc.# SDS-107-4308


Input/Output Connections 

Calibration and Symmetry Adjustment 

The following is a suggested procedure for adjusting the null (zero), gain (output level) and symmetry of the SA40012 when used with a 

mating tilt sensor. In order for this procedure to work properly, all peripheral circuitry, and the tilt sensor must be connected as shown 

above. 

It is important to note that this procedure is provided strictly as a guideline for calibration and symmetry adjustment, and provides no 

guarantee as to the resultant accuracy. The validity of the calibration will be highly dependent upon the accuracy of the supporting 

equipment used to perform the calibration, as well as the true angular position(s) of the tilt sensor during the procedure. 

1. Set null (zero) output = Place the tilt sensor in its mechanical null (level) position. Adjust the potentiometer connected between 

pins #10, #11 and #12 until the output is at 0Vdc. 




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Doc.# SDS-107-4308


2. Set output level = Rotate the tilt sensor to a known angle from null (zero), assuring that the output changes in a positive 

(+) direction. Adjust the potentiometer between pins #5 and #6 until the desired positive output voltage is achieved. 

3. Set symmetry = Rotate the tilt sensor in the opposite direction from null, to the same differential angular position. Observe 

the negative output voltage level. If the output level exceeds the allowable tolerance, adjust the potentiometer between pins 

#17 and #18 until they are within acceptable limits. Repeat all steps above until no further adjustments are required 

throughout entire procedure. 

Consult factory for further technical information and ordering details! 




PHONE: 631 582-5600 

FAX: 631 582-5671 



Doc.# SDS-107-4308

SA40072 – 4 to 20mA Signal Conditioner 

The SA40072 is a single channel signal 

conditioner, which provides a 4 to 20mA output. 

With the ability to interface directly with the 

complete line of Spectron single axis electrolytic 

tilt sensors (not included), the SA40072 is the 

perfect solution for narrow or wide angle 

measurements. The open architecture design is 

ideal for space restrictive / OEM applications, 

while the 4-20mA output can be easily interfaced 

to most industrial /process industry controllers. 

The sensor is remotely mounted from the 

electronics, thereby providing maximum 

installation flexibility. 



Input Voltage ....………..……...+14 to +24Vdc 

Input Current ....…….……….... 30mA (max) 

Output ........……….……….….... 4-20mA 

Load (maximum) 

- 500 ohms @ +14Vdc input 

- 1,000 ohms @ +24Vdc input 

Operating Temp range …….. -20 to +70 degC 

PCB Location 

ZP1 

ZP2 

ZP4 

ZP6 

ZP7 

ZP8 

Function 

Input Voltage 

Ground 

4-20mA output 

sensor electrode 'A' 

sensor electrode 'B' 

sensor neutral (center) 

Dimensions (inches) 

Output Ripple (noise) 

Output (mA) Load (ohms) Ripple (uA @ 600Hz) 

19 475 38 

12 475 2 

5 475 38 

Adjustment Potentiometers 

PCB Location Function 

R28 Null (12mA) 

R11 Positive Output (20mA max.) 

R26 Negative Output (4mA min.) 

Mounting Holes – M2.5 (2 places) 

Consult factory for technical information and 

ordering details! 




PHONE: 631 582-5600 

FAX: 631 582-5671 



Doc.# SDS-109-3308


SA40072 – 4 to 20Ma Signal Conditioner 

Technical Information and Calibration Instructions 

Dimensions, Electrical Connections and Potentiometer Locations (dimensions in inches) 

Adjustment Potentiometers 

PCB Location Function 

R28 Null (12mA) 

R11 Positive Output (20mA max.) 

R26 Negative Output (4mA min.) 


PCB Location 

ZP1 

ZP2 

ZP4 

ZP6 

ZP7 

ZP8 

Function 

Input Voltage 

Ground 

4-20mA output 

sensor electrode 'A' 

sensor electrode 'B' 

sensor neutral (center) 

Typical Current Consumption 

Input Voltage Output (mA) Input Current Draw (mA @ ZP1) 

24 -12 18.7 

14 -12 18.7 

14 -19 26.7 

24 -19 26.7 

24 0 6.4 

Note: Negative current out of circuit, positive current into circuit. 

Output deviation versus input voltage level 

• Input Voltage Range (ZP1) : +14VDC to +24VDC 

• Output Current ∆ (ZP4) : +/-2uA 




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Doc.# SAN-221-3308




Output Ripple (noise) 

Output (mA) Load (ohms) Ripple (uA @ 600Hz) 

19 475 38 

12 475 2 

5 475 38 

Recommended circuit to reduce noise 

Output Load Chart 




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Doc.# SAN-221-3308




Calibration Instructions 

NOTE: Performing this calibration will void any and all factory calibration settings!! 

1. Solder the lead wires from the tilt sensor to terminal numbers ZP6, ZP7 and ZP8 on the SA40072 Signal Conditioner, 

per the Input/Output Connection chart above. 

2. Using the ‘Output Load Chart’ in Figure 1 above, select a proper value load resistor according to the input voltage that 

will be used. 

3. Connect one end of the resister selected above to the positive (+) input terminal of an ammeter. Connect the other 

end of the resister to ZP4 on the the SA40072. Connect the ground terminal of the ammeter to ZP2 on the SA40072. 

4. Connect the DC power supply to terminal numbers ZP1 (+) and ZP2 (-) on the SA40072 respectively. 

5. Turn on DC power supply. 

6. Place tilt sensor in the level (null) position. Wait at least 20 seconds for sensor to settle. 

Note: sensors with higher fluid viscosities (i.e. damped) may require a longer waiting period! 

7. Turn ‘Sensor Null Adjustment’ potentiometer R28 until the ammeter reads 12.0mA. 

8. Rotate the tilt sensor in a counter-clockwise (negative) direction to half of the desired angular measurement range. 

Wait at least 20 seconds. Adjust potentiometer R26 to obtain an 8.0mA reading on the ammeter. 

9. Return sensor to the null position. Wait at least 20 seconds for sensor to settle. If sensor reads 12.0 mA’s, continue on 

to step #10. If not, repeat step #’s 6 through 9 until no adjustments are necessary. 

10. Rotate tilt sensor in a clockwise direction to half of the desired angular measurement range. Wait at least 20 seconds. 

Adjust potentiometer R11 to obtain a 16.0mA reading on the ammeter. 

11. Return sensor to the null position. Wait at least 20 seconds for sensor to settle. If sensor reads 12.0 mA’s, calibration is 

considered complete. If not, repeat steps #6 through #11 until no adjustments are necessary throughout entire cycle. 




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FAX: 631 582-5671 



Doc.# SAN-221-3308

SSY0079 - Single Axis CMOS Signal Conditioning Module 

> Open Architecture 

The SSY0079 Single Axis CMOS Signal Conditioning Module is a DC input/output 

operated device, which operates off a single ended supply, and provides a bipolar DC output. 

Specifically designed to interface directly with all Spectron Single Axis Tilt Sensors, and with 

the SP5000 Series Dual Axis Tilt Sensor (operating in single axis mode), this low power 

consumption conditioner is ideal for battery driven applications, while the open architecture 

design affords easy installation and adjustment access for OEM’s. The module internally 

converts the DC input voltage into an AC excitation voltage for the sensor, and demodulates 

the sensor output into a smooth amplified DC output voltage. Incorporating a proprietary signal processing algorithm, 

and an external temperature compensation sensor (optional), normal measurement errors are severely reduced. The 

SSY0079 also features overload protection, and is 100% reliability tested to provide the highest quality available. 


Input voltage ....………………….......+5Vdc to +15Vdc 

Input current ......…………………..... 0.5mA @ +5Vdc, 0.9mA @ +15Vdc 

Sensor excitation ....………………... 3V pp, square wave 

Input impedance ....……………….... 5 megohms 

Output ....………………………......... +/-1.5Vdc @+6Vdc supply, referenced to Vref 

Note; minimum output = 50mVdc + (supply voltage . 1.5Vdc) 

Load .........………………………...... 100k ohm minimum 

Time constant ...………………........ 70 msec 

Offset adjustment ………………….. +/-45 mVdc 

Output ripple ...……………….…...... 0.35% of output voltage (RG 24k ohm) 


- Null .........……………..….. 100 microvolts / Co (typical) 

- Scale ...………………........ 0.02% / C o @ +1Vdc output 

Output short duration ..…………..... Continuous (Vout and Vref) 


- Operating ..……………..... -25 to +70C o 

- Storage .…………….…..... -40 to +80C o 


- Temperature compensation of the assembly (module and sensor) can be accomplished using an 

external silicon temperature sensor (KTY81-120) and a resistor (SBT). Exact resistor value is 

determined by placing a decade resistor box across R3, and adjusting until desired results is 

obtained. With this configuration, it is possible to reduce the scale temperature coefficient error from 

a 0.3%/C o (nominal), to 0.03%/C o (nominal). Please see wiring diagram for connection points. 




PHONE: 631 582-5600 

FAX: 631 582-5671 


Doc.# SDS-123-1805

SSY0079 - Single Axis CMOS Signal Conditioning Module 

> Open Architecture 


mm (inches) 




PHONE: 631 582-5600 

FAX: 631 582-5671 


Doc.# SDS-123-1805

SSY0135 – RS232 Signal Conditioner 

The SSY0135 RS232 Signal Conditioner is a Single Axis Conditioner, which 

delivers an RS232 output. Designed to utilize the entire line of SH Series Ceramic Tilt 

Sensors (not included), the SSY0135 is capable of supplying digital data over a +/-0.5 

to +/-80 degrees full range (sensor dependent). The output can be easily interfaced 

to a PC using the serial port, or directly to a microcontroller. The open architecture 

design simplifies installation, allows easy access for gain adjustment, and makes this 

conditioner perfect for OEM applications. Other select Spectron sensors may also be 

used with the SSY0135. Consult factory for details. 


Communication Protocol 

Input voltage ………………………….+7 to +20Vdc Baudrate ………………………..…… 19200 

Input current …………………………. 5mA @ +12Vdc 

Data width …………….…………….. 8 bits 

Resolution …………………..……….. 12 bits 

Parity ………………………………... none 

Response time ……………. ……… 25 mSec 

Flow control ………………………… none 

Null offset adjustment …………….... programmable Stop bit ……………………………… 1 

Operating Temp range …………….. -20 to +70 degC 

* Consult factory for detailed communication protocol information! 

Storage Temp Range ………….…... -40 to +90 degC 

Stability over temperature ………… +/-2 bits 

Ordering Information 

Temperature resolution ….……..….. 1 degC 

Clock Speed ………………………… 10 Mhz 

part number = SSY0135-XX (-XX denotes sensor type) 





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FAX: 631 582-5671 


Doc.# SDS-124-0804


SSY0135 - RS232 (MICRO-50) Signal Conditioner Operating 

Instructions 

The following Application Note details the process for connecting an .SH. Series (Ceramic) Electrolytic Tilt 

Sensor to the SSY0135-XX Signal Conditioning Module, and the communication protocol. The .XX at the end 

of the part number will denote the actual type sensor used. 


Resolution 

Current supply 

Stability over temperature 

Temperature resolution 

Operating temperature 

Response Time 

Clock Speed 

12 bits 

5 mA @ 12VDC 

+/- 2bits 

1 Deg Celsius 

-20C + 70C 

25 ms 

10Mhz 

Sensor Connections 

The sensor leads should be soldered to the circuit board in the following manner. 

SINGLE AXIS SENSOR 

3 

1 

2 

connector 

1 

pot 




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Doc.# SAN-207-0607



Instructions 


Circuit Board 

Connection JP3 

Function 

Corresponding PC 

Serial Port 

connection * 

Pin # Pin # 

1 Input = +7 to +30Vdc none 

2 Ground 5 

3 Output Data 2 

4 Input Command 3 

* A DB9 type connector is required to connect to the PC serial port (not supplied) 

Communication Protocol 

All functions are available in the single axis configuration. The serial port is setup for the following protocol. 

RS232C 

Baudrate 19200 

Data width 8 bits 

Stop bit 1 

Parity none 

Flow Control none 

Commands 

All the commands have to be sent in the upper case mode in ASCII format. 

A 

B 

C 

D 

E 

F 

G 

H 

I 

Reset board 

Read Pitch ( not used in single axis configuration) 

Read Roll 

Read Temperature 

Reserved 

Stores offset for the roll and pitch 

Reserved 

Send calibration data 

Turn off excitation 

When the A command is sent to the SSY0135, it resets itself, and sends back the ASCII character 'R' when it is ready to 

accept a new command. 

B and C command will be followed by 4 bytes. The first 3 bytes will be ASCII characters, representing the angle in 

Hexadecimal (to translate into an angle see the calibration sheet). The last byte is the Line Feed 10 (A in hexadecimal). 




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Doc.# SAN-207-0607



Instructions 

When F is received the unit turns off the sensor excitation. It stores the next 4 characters (ASCII format) as an offset for 

the pitch axis (not used in single axis configuration), and then stores the next four characters for the roll axis. The values 

are stored in the nonvolatile memory of the microcontroller in hexadecimal format. Once the microcontroller has stored the 

values in its memory, it restarts the excitation and sends .R. to the host. It will take 20 seconds to read a stable output 

from the time the excitation is turned back on. This is equivalent to turning the unit power on. 

The microcontroller will do a two.s complement addition with the reading from the analog to digital converter. It should be 

noted that when the offset is added to the result of the analog to digital converter the output on the end of the scale can 

change the sign. 

H tells the signal conditioner to send to the host, in the following order, the pitch offset, the roll offset and the temperature 

coefficient. The temperature coefficient is set to 1 and is reserved for future extensions. 

I command turns off the excitation to the microcontroller. This allows the user to save power. It will take 20 seconds for the 

measurement to be stable once the excitation is turned on. The excitation is turned back on when the microprocessor is 

reset with the command A or the power is turned off and on. 

D command will connect the output of the temperature sensor to the amplifier.s input. The SSY0135 will send the data 

with the same format as for the pitch and roll. The gain adjustment does not affect the temperature measurement.. The 

scale factor is 1 counts per Degree Celsius (160 (0A0Hex) AT 25). 

Circuit Block Diagram 

VCC 

Tilt axis 

Enable Temperature 

t 

THERMISTOR 

JP1 

1 

2 

3 

4 

4 HEADER 

Voltage regulator 

VCC 

Sensor 

3 4 

1 2 

5 

Amplifier 

R20 

Gain 

5PIN 

Voltage converter 

Serial link adapter 

RS232 format 

Data in 

Data out 

Microprocessor Unit 

Data 

Ctrl. 

12 bits Analog to 

Digital 

Converter 

Note . Gain Adjustment is accomplished by adjusting the potentiometer (R20) on the circuit board. 




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Doc.# SAN-207-0607



Instructions 

Connecting to a PC 

The output of the MICRO-50 can be read directly with a PC by using Hyper-terminal. Setup Hyper-terminal the following 

way. HyperTerminal is located in the folder Programs\Accessories\Communications. The setup is found in the menu File 

‘Properties’. 

In the window "Connect using", select the serial port the MICRO-50 is attached to. Press the button to configure. 

Setup as follows: 

bits per second = 19200 

data bits = 8 

parity = none 

stop bits = 1 

Flow control = none 

The output of the SSY0135 is ASCII characters, in Hexadecimal format (see COMMANDS above). 

Example 

For instance at 0 degree tilt the output of the unit is 800(HEX). To convert it in decimal use this equation: 

First byte * 16^2 + Second byte * 16 + third byte 

8*16^2 + 0*16 + 0 = 2048 

If the unit is tilted and the output is A11 the conversion in decimal is : 

(10) A*16^2 + 1*16 + 1 = 2577 

The output can be converted to an angle the following way : 

(2577-2048)* (the scale factor provided with the unit calibration sheet). 

To linearize the SSY0135 for a dual axis sensor type SP50XX, use the following characteristic equation: 

Coeff3 X output^3 + Coeff2 X output^2 + Coeff1 X output 

The following are the coefficients: 

60 degrees angle 

Coeff1 = 0.0468 

Coeff2 = 0 

Coeff3 = -0.000000004 


Coeff1 = 0.03125 

Coeff2 = 0 

Coeff3 = -0.000000002 


Coeff1 = 0.0129 

Coeff2 = 0 

Coeff3 = -0.0000000003 

The output when the sensor is at 0 degrees is 2048. 2048 should be subtracted from the output before applying the 

equation. 




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Doc.# SAN-207-0607

MUPI-2 - Universal Signal Conditioner

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