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1. Precision Current Meter with accuracy of ±0.025% at 20mA.
2. Precision Current Source with accuracy of ±0.025% at 20mA
Place in fresh batteries and allow one hour for the CL531 to stabilize to the ambient
temperature. Remove the battery cover and the Phillips head screws. While holding the CL531
face up in one hand, carefully separate the top and bottom of the housing. Place the unit into
calibration mode by putting the switch into the OFF position and shorting the calibration via labele
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on the PCB with a shorting jumper or tweezers. Verify the CL531 is in calibration mode by
viewing the LCD for the words “CALIBRATION REQUIRED”.
Turn the CL531 on by moving the on/off switch to either “Read” or “Source”. Connect the
CL531 terminals to a Current Source.
1. Slide the EZ-Check™ Switch to the LO position indicated by displaying a “LO” on the
left side of the LCD.
2. Set the current source to 0.000 mA.
3. Press and hold the EZ-Dial in for a few seconds.
4. The display will flash “STORED” to confirm that the displayed calibration constant
value was stored.
1. Slide the EZ-Check™ Switch to the HI position indicated by displaying a “HI” on the
left side of the LCD.
2. Set the current source to 20.000 mA.
3. Press and hold the EZ-Dial in for a few seconds.
4. The display will flash “STORED” to confirm that the displayed calibration constant
value was stored.
CL531 Field Calibration Procedure
Turn the unit off then back on to source mode by putting the on/off switch in the high position.
Connect the Model 531 terminals to a Current Meter.
1. Slide the EZ-Check™ Switch to the LO position indicated by displaying a “LO” on the
left side of the LCD.
2. Allow the current meter to settle and for the microprocessor to store 4mA.
1. Slide the EZ-Check™ Switch to the HI position indicated by displaying a “HI” on the
left side of the LCD.
2. Allow the current meter to settle and for the microprocessor to store 20mA.
Check the linearity calibration in source mode by dialing the Model 531 from 4.00mA to 4.01mA.
If the linearity is calibrated correctly the unit will go from 4.00mA to 4.01mA. If this fails, repeat
the calibration from the start.
This is the completion of calibration.
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