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Calibration
All parameters can be calibrated without opening the case, i.e. the generator offers ‘closed−box’
calibration. All adjustments are made digitally with calibration constants stored in flash memory. The
calibration routine requires only a DVM, oscilloscope and a frequency counter and takes no more
than a few minutes.
Calibration should be carried out only after the generator has been operating for at least 30 minutes
in normal ambient conditions.
Equipment Required
• 3½ digit DVM with 0·25% DC accuracy and 0·5% AC accuracy at 1kHz.
• Universal counter capable of measuring 10·00000MHz with an accuracy of ±0.1ppm.
• Oscilloscope with a bandwidth of at least 100MHz.
Calibration Procedure
Pressing the UTILITY key followed by the Calib soft-key shows the opening screen for
instrument calibration.
The software provides for a 4−digit password in the range 0000 to 9999 to be used to access the
calibration procedure. If the password is left at the factory default of 0000 no messages are shown
and calibration can proceed as described in the Calibration Routine section; only if a non−zero
password has been set will the user be prompted to enter the password.
Setting the Password
On opening the Calibration screen press the Pswrd soft-key to show the password screen:
Enter a 4−digit password from the keyboard; the Edit Box will show the message Confirm. Re-enter
the password and the message NEW PASSWORD STORED will pop up for two seconds before
returning to the top level calibration menu.
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