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281, 282, 284
Users Manual
Introduction
All parameters can be calibrated without opening the instrument case; the generator
offers ‘closed-box’ calibration. All adjustments are made digitally with calibration
constants stored in EEPROM. The calibration routine requires only a digital voltmeter
(DVM) and a frequency counter and takes no more than a few minutes.
The crystal in the timebase is pre-aged but a further ageing of up to ±5 ppm can occur in
the first year. Since the ageing rate decreases exponentially with time it is an advantage to
recalibrate after the first six month’s use. Apart from this it is unlikely that any other
parameters will need adjustment.
Calibration should be carried out only after the generator has been operating for at least
30 minutes in normal ambient conditions.
Equipment Required
1. 3½ digit DVM with 0·25% dc accuracy and 0·5% ac accuracy at 1 kHz.
2. Frequency counter capable of measuring 10·00000 MHz.
The DVM is connected to the MAIN OUT of each channel in turn and the counter to any
SYNC OUT.
Frequency meter accuracy will determine the accuracy of the generator’s clock setting
and should ideally be ±1 ppm.
Calibration Procedure
The calibration procedure is accessed by pressing the calibration… soft-key on the
UTILITY screen.
CALIBRATION SELECTED
Are you sure ?
password… tests…
exit continue
The software provides for a 4-digit password in the range 0000 to 9999. The password is
used to protect against accidental or unauthorized access to 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 below; 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 password… soft-key to show the
password screen:
ENTER NEW PASSWORD
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1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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