Fluke 5520A - Page 180

5520A
Service Manual
6-40
Set the Calibrator Mainframe to SCOPE mode, with the Levsine menu on the display.
Press O on the Calibrator Mainframe to activate the output. Then follow these steps to
verify the leveled sine wave amplitude.
1. Connect the BNC cable to the Calibrator Mainframe’s SCOPE connector. Connect
the other end of the BNC cable to the 50Ω feedthrough termination then to the 5790A
INPUT 2 using the BNC(f) to Double Banana adapter.
2. Set the 5790A to AUTORANGE, digital filter mode to FAST, restart fine, and Hi
Res on.
3. Program the Calibrator Mainframe to output the voltage listed in Table 6-29.
4. Allow the 5790A reading to stabilize, then record the 5790A’s rms reading for each
voltage listed in Table 6-29.
5. Multiply the rms reading by the conversion factor of 2.8284 to convert it to the peak-
to-peak value.
6. Multiply the peak-to-peak value by (0.5 * (50 + Rload) / Rload), where Rload = the
actual feedthrough termination resistance, to correct for the resistance error. Compare
result to the tolerance column.
Table 6-29. Leveled Sine Wave Amplitude Verification
Calibrator
Mainframe
output
(@ 50 kHz)
5790A Reading
(V rms)
5790A Reading x
2.8284 (V p-p)
V p-p value x
correction
Tolerance
(V p-p)
5.0 mV 400 µV
7.5 mV 450 µV
9.9 mV 498 µV
10.0 mV 500 µV
25.0 mV 800 µV
39.0 mV 1.08 mV
40.0 mV 1.10 mV
70.0 mV 1.70 mV
99.0 mV 2.28 mV
100.0 mV 2.30 mV
250.0 mV 5.30 mV
399.0 mV 8.28 mV
0.4 V 8.3 mV
0.8 V 16.3 mV
1.2 V 24.3 mV
1.3 V 26.3 V
3.4 V 68.3 mV
5.5 V 110.3 mV