Service Information
P6021 Instruction Manual
19
d. Adjust the calibrator output for a 10.0 mV amplitude measurement.
Allow time for the averaged value to settle. Do not use the peak-to-peak
measurement when setting the pulse reference amplitude.
e. Turn on the gating measurement mode and use the gated cursors and
peak-to-peak measurement to verify the aberration specification, which
are peak-to-peak tolerances.
f. Select 10 ns/div to verify the first 50 ns specification and 50 ns/div to
verify the >50 ns specification. Position the gated cursors to define the
measurement zones for each case.
With the oscilloscope at 2 mV/div, 10% =1 mV or 0.5 division;
2% =0.2 mV or 0.1 division (for a reference 10 mV
p-p
signal).
10. The following adjustments affect aberrations and flat-top response:
C13, R10, and R12 of the probe (see Figure 7) and C22, C25, and R36 of the
termination (see Figure 8). To minimize aberrations and achieve the best
flat-top response, the following procedure is recommended. However, these
adjustments interact; you may have to readjust several of them to ensure
minimum aberrations..
a. Adjust R10 and R12 for flat response. (Controls overshoot in the first
10 ns time domain.)
b. Adjust C13 for flat response. (Controls slope in first 20 ns.)
c. Adjust R36 for flat response. (Controls front corner, first 5 ns.)
d. Adjust C25 to minimize wrinkles in the 10 to 20 ns domain.
e. Adjust C22 to minimize wrinkles in the 15 to 25 ns domain.
C13
R10
R12
TEKTRONIX, INC
125 TURNS
P6021 AC CURRENT PROBE
Figure 7: Location of probe adjustments
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