Fluke 5500A, Service Manual

Page: 228 / 296

5500A
Service Manual
6-102
6-130. 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 6-61.
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 6-61.
3. Enter 50 kHz into the Calibrator Mainframe. Allow the 5790A reading to stabilize,
then enter the 5790A reading in Column B of Table 6-61.
4. Enter the next frequency listed in Table 6-61. 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 6-61.
6. Repeat steps 4 and 5 for all of frequencies listed in Table 6-61. 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 6-61 by performing the calculations for
column C. Compare Column C to the specifications listed in the final column.
Table 6-61. Low Frequency Flatness Verification at 5.5 V
Calibrator
Mainframe
Frequency A B
50 kHz
C
Calibrator Mainframe
Flatness Specification (%)
500 kHz
±
1.50 + 100
µ
V
1 MHz
±
1.50 + 100
µ
V
2 MHz
±
1.50 + 100
µ
V
5 MHz
±
1.50 + 100
µ
V
10 MHz
±
1.50 + 100
µ
V
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)
6-131. 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 6-62. 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 6-62.