Fluke 5500A - Low Frequency Verification; High Frequency Verification

5500A
Service Manual
6-46
6-63. Low Frequency Verification
This procedure provides an example of testing low frequency flatness using a 5.5 V
output. Follow the same procedure for testing other amplitudes, only compare results
against the flatness specification listed in Table 6-32.
1. Program the Calibrator Mainframe for an output of 5.5 V @ 500 kHz. Press O on
the Calibrator Mainframe to activate the output.
2. Allow the 5790A reading to stabilize. The 5790A should display approximately 1.94
V rms. Enter the 5790A reading in Column A of Table 6-32.
3. Enter 50 kHz into the Calibrator Mainframe. Allow the 5790A reading to stabilize,
then enter the 5790A reading in Column B of Table 6-32.
4. Enter the next frequency listed in Table 6-32. Allow the 5790A reading to stabilize,
then enter the reading into Column A of the table.
5. Enter 50 kHz into the Calibrator Mainframe. Allow the 5790A reading to stabilize,
then enter the 5790A reading in Column B of Table 6-32.
6. Repeat steps 4 and 5 for all of frequencies listed in Table 6-32. Continue until you
have completed Columns A and B.
7. When you have completed Columns A and B, press Y to remove the Calibrator
Mainframe’s output. Complete Table 6-32 by performing the calculations for
column C. Compare Column C to the specifications listed in the final column.
Table 6-32. Low Frequency Flatness Verification at 5.5 V
Calibrator
Mainframe
Frequency
AB
50 kHz
C
Calibrator Mainframe
Flatness Specification (%)
500 kHz ±1.50
1 MHz ±1.50
2 MHz ±1.50
5 MHz ±1.50
10 MHz ±1.50
Complete Columns A-C as follows:
A Enter 5790A Reading (mV) for the present frequency.
B Enter 5790A Reading (mV) for 50 kHz.
C Compute and enter the Calibrator Mainframe Flatness Deviation (%): 100 * ((Column A entry)-
(Column B entry))/ (Column B entry)
6-64. High Frequency Verification
This procedure provides an example of testing high frequency flatness using a 5.5 V
output. Follow the same procedure for testing other amplitudes, only compare results
against the flatness specification listed in Table 6-33. For this voltage range, you will use
the model HP 8482A power sensor.
1. Program the Calibrator Mainframe for an output of 5.5 V @ 30 MHz. Press O on
the Calibrator Mainframe to activate the output.
2. Allow the power meter reading to stabilize. The power meter should display
approximately 75 mW. Enter the power meter’s reading in Column A of Table 6-33.