Knowledge Base:  
Tech Note 107: Recalibrating CMCP505 Digital Displays <01/01/07
Last Updated: 05/10/2017
Recalibrating 505 Digital DisplaysCMCP505 LED/LCD Displays sold prior to 01/01/07 can only be recalibrated to a different full scale by changing resistor R2. The existing R2 resistor may be removed using a soldering iron and solder sucker. R2 can then be carefully replaced after shaping and clipping the leads to the proper shape and length. If a solder sucker is not available simply clip out the resistor by cutting the leads close to the resistor body. The leads remaining in the board can then be stood up and new resistor soldered between them. Replacement resistors need to be 1% precision resistor, 1/4 watt.
After installing the proper resistor, apply 5.00 VDC to the input, the full scale value can be adjusted (tweaked) using the 3/4 turn potentiometer accessible through hole in circuit board. Do not force potentiometer over 3/4 turn or permanent damage will result.

If a 5.00 VDC supply is not readily available the voltage output of the CMCP500 Monitor can be used. Using the front selector switch select "Danger" for the danger alarm set point. Increase the set point to 5.00 VDC using a quality digital voltmeter. Adjust display as above then reset danger set point.

Decimal point location is changed by solder gaps SG1 (0.000), SG2 (00.00) and SG3 (000.0). Remove and add solder to the appropriate solder gap.
Engineering Unit Decimal Point Guideline:
in/sec = 0.00 (hundredths)
mm/sec = 00.0 (tenths)
mils = 00.0 (tenths)
microns = 000 (none)
temperature = 000 (none)


CMCP505 Display PWB

Value R2 Value Full-Scale Value
050 9.1k .050, .50, 5.0, 50
100 18.7k .100, 1.00, 10.0, 100
150 28k .150, 1.50, 15.0, 150
200 37.4k .200, 2.00, 20.0, 200
250 47.5k .250, 2.50, 25.0, 250
300 57.6k .300, 3.00, 30.0, 300
350 68.1k .350, 3.50, 35.0, 350
400 78.7k .400, 4.00, 40.0, 400
450 909k .450, 4.50, 45.0, 450
500 100k .500, 5.00, 50.0, 500
550 113k .550, 5.50, 55.0, 550
600 124k .600, 6.00, 60.0, 600
650 137k .650, 6.50, 65.0, 650
700 147k .700, 7.00, 70.0, 700
750 160k .750, 7.50, 75.0, 750
800 174k .800, 8.00, 80.0, 800
850 187k .850, 8.50, 85.0, 850
900 200k .900, 9.00, 90.0, 900
950 215k .950, 9.50, 95.0, 950
1000 226k 1.000, 10.00, 100.0, 1000
1100 255k 1.100, 11.00, 110.0, 1100
1200 287k 1.200, 12.00, 120.0, 1200
1300 316k 1.300, 13.00, 130.0, 1300
1400 357k 1.400, 14.00, 140.0, 1400
1500 390k 1.500, 15.00, 150.0, 1500
1600 430k 1.600, 16.00, 160.0, 1600
1700 470k 1.700, 17.00, 170.0, 1700
1800 511k 1.800, 18.00, 180.0, 1800
1900 560k 1.900, 19.00, 190.0, 1900
1999 604k 1.999, 19.99, 199.9, 1999


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