Fluke 5500A, Service Manual

Page: 215 / 296

SC300 Option
Verification
6
6-89
6-117. Verification at 50
Ω
For the 50
Ω
verification, connect the Calibrator Mainframe’s SCOPE connector to the
HP 3458A input, using the cable supplied with the Calibrator Mainframe, the external 50
Ω
termination, and the BNC(f) to Double Banana adapter. (The 50
Ω
termination is
closest to the HP 3458A input.) Make sure the Calibrator Mainframe impedance is set to
50
Ω
. (The blue softkey under Output Z toggles the impedance between 50
Ω
and 1
M
Ω
). Proceed with the following steps:
1. Set the HP 3458A to the values shown in Table 6-48. Manually lock the HP 3458A
to the range that gives the most resolution for the topline measurements. Use this
same range for the corresponding baseline measurements at each step.
2. Measure the topline first, as indicated in Table 6-52. For each measurement, take
samples for at least two seconds, using the HP 3458A MATH functions to determine
the average or mean value. See “Setup for Square Wave Measurements” for more
details.
3. Measure the baseline of each output after the corresponding topline measurement, as
indicated in Table 6-52. The peak-to-peak value is the difference between the topline
and baseline measurements. Multiply the readings by (0.5 * (50 + Rload) / Rload),
where Rload = the actual feedthrough termination resistance, to correct for the
resistance error. Compare the result to the tolerance column.
Table 6-52. AC Voltage Verification at 50
Ω
Nominal Value
(p-p)
Frequency Measured Value
(p-p)
Deviation
(mV)
1-Year Spec.
(mV)
5.0 mV 10 Hz 0.11
5.0 mV 100 Hz 0.11
5.0 mV 1 kHz 0.11
5.0 mV 5 kHz 0.11
5.0 mV 10 kHz 0.11
10.0 mV 100 Hz 0.12
10.0 mV 1 kHz 0.12
10.0 mV 10 kHz 0.12
20.0 mV 10 kHz 0.15
44.9 mV 10 Hz 0.21
44.9 mV 10 kHz 0.21
50.0 mV 10 kHz 0.23
100.0 mV 100 Hz 0.35
100.0 mV 1 kHz 0.35
100.0 mV 10 kHz 0.35
200.0 mV 10 kHz 0.60
449.0 mV 10 Hz 1.22
449.0 mV 10 kHz 1.22