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15. TRANSMITTER CALIBRATION
All ranges of our transmitters have been digitally calibrated at the factory prior to shipment
using computers and calibration equipment certified to NIST standards. If recalibration is
required, your transmitter may be returned to the factory or to an authorized distributor.
The counter main board contains an EEPROM, which stores calibration constants for the quartz
crystal oscillator and the analog output. The V-to-F converter signal conditioner board stores its
own stores its own voltage-to-frequency calibration constants EEPROM. The dual channel pulse
input signal conditioner and quadrature signal conditioner boards do not require calibration. As
a result, transmitter signal conditioner boards can be interchanged without recalibration.
Calibration of the quartz crystal is easily accomplished using Instrument Setup software. Select
Calibration from the Main Menu. Apply a frequency reference signal, and enter the known
frequency in Hz. Calibration of the V-to-F signal conditioner requires use of voltage reference
signals and the calibration program vfcal3.exe, which is available for free download.