14. METER CALIBRATION
SSI meters are calibrated digitally at the factory prior to shipment using calibration equip-
ment certified to NIST standards. Digital calibration eliminates much of circuitry that would
be associated with analog calibration, providing superior long term accuracy and stability.
Calibration constants and the last meter calibration date are stored digitally in non-volatile
memory in EEPROM. To retrieve the last calibration date, press RECALL for longer than
2 seconds to change to the Recall mode, then press UNITS.
The instrument calibration indicator (CAL INSTRUMENT) indicates when the meter is due
for calibration. The SSI also features a clearable flashing indicator when the meter is within
30 days of the calibration due date.
Annual recalibration by the factory is recommended. Please contact Transducer Techniques
for an RMA number. See Section 18, “Warranty & Repair Policy.”
15. 7-SEGMENT ALPHABET