Fluke 5820A, Руководство по обслуживанию

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5820A
Service Manual
3-52
3-52. Verification at 50
Ω
Set the Calibrator Mainframe impedance to 50
Ω
(The blue softkey under SCOPE Z
toggles the impedance between 50
Ω
and 1 M
Ω
).
1. Connect the N to BNC cable to the Calibrator Mainframe’s CHAN 1 connector.
Connect the other end of the N to BNC cable to the 50
Ω
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 wave type and voltage listed in
Table 3-25.
4. Allow the 5790A reading to stabilize, then record the 5790A rms reading for each
wave type and voltage in Table 3-25.
5. Multiply the rms reading by the conversion factor listed 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 3-25. Wave Generator Verification at 50
Ω
Calibrator
Mainframe
Wave
Type
Calibrator
Mainframe
Output
(10 kHz)
5790A
Reading
(V rms)
Conversion
Factor
5790A Rdg x
Conversion
Factor (V p-p)
V p-p Value
x correction
Tolerance
(V p-p)
square 1.8 mV 2.0000 0.000154 V
square 6.4 mV 2.0000 0.000292 V
square 10.9 mV 2.0000 0.000427 V
square 11.0 mV 2.0000 0.00043 V
square 28.0 mV 2.0000 0.00094 V
square 44.9 mV 2.0000 0.001447 V
square 45 mV 2.0000 0.00145 V
square 78 mV 2.0000 0.00244 V
square 109 mV 2.0000 0.00337 V
square 110 mV 2.0000 0.0034 V
square 280 mV 2.0000 0.0085 V
square 449 mV 2.0000 0.01357 V
square 450 mV 2.0000 0.0136 V
square 780 mV 2.0000 0.0235 V
square 1.09 V 2.0000 0.0328 V
square 1.10 V 2.0000 0.0331 V
square 1.80 V 2.0000 0.0541 V