Fluke 8808A - Frequency Verification; Adjustment (Calibration); Adjustment Process; Equipment for Calibration

Performance Verification and Calibration
Frequency Verification 3
3-11
Frequency Verification
Use the function generator to apply the frequencies listed in Table 3-8.
Table 3-8. Frequency Verification Steps
Nominal Input 90-Day Test Limit 1-Year Test Limit
Ampl. Freq.
Range
High Low High Low
0.1 V 20 Hz 2000 Hz 20.04 Hz 19.96 Hz 20.06 Hz 19.94 Hz
0.1 V 50 Hz 2000 Hz 50.01 Hz 50.00 Hz 50.01 Hz 50.00 Hz
0.1 V 1900 Hz 2000 Hz 1900.19 Hz 1899.81 Hz 1900.19 Hz 1899.81 Hz
0.1 V 19 kHz 20 kHz 19.0023 Hz 18.9977 Hz 19.0025 Hz 18.9975 Hz
0.1 V 195 kHz 200 kHz 195.024 Hz 194.977 Hz 195.026 Hz 194.975 Hz
0.1 V 1000 kHz 1000 kHz 1000.14 Hz 999.86 Hz 1000.16 Hz 999.84 Hz
Adjustment (Calibration)
Meter adjustments, or calibration, should be performed at the desired interval, or
whenever a verification test indicates a Meter function is out of tolerance. The Meter
accuracy will stay within specifications only if the adjustment procedure is performed at
regular intervals. A one-year interval is adequate for most applications. The Meter’s
accuracy specifications are not valid beyond the one-year interval.
Equipment for Calibration
The required equipment for calibration is the same as the equipment listed in Table 3-1.
Adjustment Process
The Meter adjustment process can either be managed through the front panel of the Meter
or through the RS-232 port. In addition, a completely automated procedure is available as
a Fluke Met/Cal program.
Front Panel Adjustments
To put the Meter in the calibration mode, remove the CAL seal and press the Cal Enable
button located on the bottom-right side of the front panel with a thin needle. CAL will
appear in the secondary display with six flashing dashes in the primary display.
To calibrate a function:
1. Push A, B, D, E, F, or O to start the calibration process. A
recommended calibration value will appear in the primary display and continue to
flash until the input is set.
Note
The recommended value can be overwritten by pushing C for
the + or – sign and a through f for the six digits.
2. With a stable input to the Meter, push R to start calibrating the current calibration
point. The displayed value freezes and a flashing star appears in the display. The
Meter automatically makes the necessary adjustment to bring the Meter into
specification. No internal mechanical adjustments are necessary.
The adjustment steps are divided into six areas by six functions. Table 3-9 lists the
calibration steps and indicates the function/command, calibration point, required input
signal with frequency, and a description.