Low Frequency Calibration; High Frequency Calibration - Fluke 5520A Service Manual

5520A
Service Manual
Press the OPTIONS and NEXT SECTION blue softkeys until the display reads "Set up
to measure leveled sine flatness".

6-109. Low Frequency Calibration

Connect the Calibrator Mainframe SCOPE connector to the 5790A WIDEBAND input
as described under "Equipment Setup for Low Frequency Flatness".
Follow these steps to calibrate low frequency Leveled Sine Wave flatness for the
amplitude being calibrated:
1. Press the GO ON blue softkey.
2. Establish the 50 kHz reference:
3. Press the GO ON blue softkey.
4. Adjust the amplitude using the Calibrator Mainframe front panel knob until the
5. Repeat steps 1 to 4 until the Calibrator Mainframe display indicates that the

6-110. High Frequency Calibration

Connect the Calibrator Mainframe SCOPE connector to the power meter and power
sensor as described in, "Equipment Setup for High Frequency Flatness" earlier in this
section.
Follow these steps to calibrate high frequency Leveled Sine Wave flatness for the
amplitude being calibrated.
1. Press the GO ON blue softkey.
2. Establish the 10 MHz reference:
3. Press the GO ON blue softkey.
4. Press the power meter SHIFT key, then FREQ key and use the arrow keys to enter
5. Adjust the amplitude using the Calibrator Mainframe front panel knob until the
6. Repeat steps 1 to 5 until the Calibrator Mainframe display indicates that either the
6-82
Allow the 5790A rms reading to stabilize.
Press the 5790A Set Ref blue softkey. (Clear any previous reference by pressing
the 5790A Clear Ref blue softkey prior to setting the new reference if required.)
5790A reference deviation matches the 50 kHz reference within 1000 ppm.
reference frequency is now 10 MHz. Continue with the high frequency calibration.
Press the power meter SHIFT key, then FREQ key and use the arrow keys to
enter the power sensor's 10 MHz Cal Factor. Ensure that the factor is correct,
then press the power meter ENTER key.
Allow the power meter reading to stabilize.
Press the Power meter REL key.
the power sensor's Cal Factor for the frequency displayed on the Calibrator
Mainframe. Ensure that the factor is correct, then press the power meter ENTER
key.
power sensor reading matches the 10 MHz reference within 0.1%.
reference frequency is now 50 kHz or that the next steps calibrate pulse width.
Repeat the low frequency calibration procedure for the next amplitude unless the
Calibrator Mainframe display indicates that the next steps calibrate pulse width.
Press the OPTIONS, then STORE CONSTS blue softkeys to store the new
calibration constants.