5080A
Service Manual
62
Note
The Product shows a warning message if the typed in measurement
is out of limit. Look at the measurement again and re-enter the value
carefully, with the correct multiplier (m, k, n, p, etc.). If the warning
continues to show in the display, Product repair can be necessary.
7. Do steps 6 and 7 again until The next steps calibrate SC200ACV shows in
the display.
8. Push the OPTIONS, then STORE CONSTS softkeys to keep the calibration
constants.
AC Square Wave Voltage Calibration
The equipment and setup is the same for ac voltage calibration as the dc voltage
calibration. There are different parameters for the HP3458A multimeter.
If “The next steps calibrates SC200 ACV” is not already shown in the Product
display, push the OPTIONS and then NEXT SECTION softkeys until it does
show.
1. Push the GO ON softkey.
2. Connect the Product to the HP3458A as shown in Figure 17.
3. Set the HP3458A to DCV, NPLC=.01, LEVEL 1, TRIG LEVEL, and the
DELAY to .0002 to measure the top part of the waveform (topline). Change
the DELAY to .0007 to measure the lower part of the waveform (baseline).
Set the meter range to a range that shows the maximum resolution for the
topline measurements. Use this same range for the related baseline
measurements at each step.
4. At each calibration step, read measurements for a minimum of two seconds,
with the HP 3458A MATH function to get the average or mean value.
The “true amplitude” of the waveform is the difference between the topline
and baseline measurements, with a correction for the load resistance error.
To make this correction, multiply the measurements by (0.5 * (50 +
Rload)/Rload), where Rload = actual feedthrough termination resistance.
Note
The Calibration mainframe will warn 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.
5. Do step 4 again until the Product mainframe display shows WAVEGEN CAL
as the subsequent step. Push the OPTIONS, then the STORE CONSTS
softkeys to keep the new calibration constants.
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