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Tech Note 107: Recalibrating CMCP505 Digital Displays <01/01/07

CMCP505 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)

Factory recalibration charge is $50.00 plus shipping. Precision resistors are in stock and are available at no charge. Rush or International shipping charges may apply.

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