5080A
Service Manual
64
Leveled Sine Wave Amplitude Calibration
To do a leveled sine wave amplitude calibration:
1. Push the OPTIONS and NEXT SECTION softkeys until the display shows
Set up to measure leveled sine amplitude.
2. Use the BNC cable, double-banana adapter, and the 50 Ω feed-through
termination to connect the scope out connector of the Product to the 5790A
or 5790B as shown in Figure 18.
UUT5790A or 5790B
5790A
AC MEASUREMENT
STANDARD
1000V RMS MAX 1000V RMS MAX
3V RMS MAX
INPUT 1 INPUT 2
SHUNT
HI
LO
GUARDGROUND
SHELL FLOATING
10V PEAK
MAX
WIDEBAND
7V RMS MAX
MAX
10V PK
SHELL FLOATING
gru109.eps
Figure 18. Product Mainframe to 5790A AC Measurement Standard Connections
3. Set the 5790A or 5790B to autorange, digital filter mode to fast, restart fine,
and Hi Res on.
4. Push the GO ON softkey.
5. Push .
6. When you see stable measurements on the 5790A or 5790B, multiply the
measurement by (0.5 * (50 + Rload)/Rload), to correct for the resistance
error. Rload is the actual feed-through resistance. Type in the calculated rms
measurement through the Product keypad.
7. Push .
Note
The Calibration mainframe warns you when the typed in value is out
of limits. If this warning occurs, inspect the setup and carefully type
in the measurement again with the correct multiplier (m, u, n, p, etc.).
If the warning continue to show in the display, repair can be
necessary.
8. Do steps 6 and 7 again until the Product mainframe display shows
CALIBRATE LEVELED SINE FLATNESS as the subsequent step. Push the
OPTIONS, then the STORE CONSTS softkeys to keep the new calibration
constants.
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