Tektronix TDS 420A, Service Manual, Page: 97 / 288

Performance Tests
TDS 420A, TDS 430A & TDS 460A Service Manual
4- 29
H
Read the results at the CHx Pk-Pk readout, which automatically
measures the amplitude of the test signal. (See Figure 4--7.)
Set the horizontal
scale from the tables.
Set the generator
frequency to the test
frequency from
tables 4--3 and 4--4.
Read the results
from the readout of
measurement Pk-Pk.
1
2
3
Figure 4- 7: Measurement of Analog Bandwidth
g. Check against limits:
H
CHECK that the Pk-Pk readout on screen is within the limits listed
in Table 4--3 (TDS 420A) or Table 4--4 (TDS 430A and
TDS 460A) for the current vertical scale setting
.
H
When finished checking, set the horizontal SCALE back to the
50 ns setting (the setting you used in step 1b.
STOP
. Checking the bandwidth of each channel at all vertical scale settings is
time consuming and unnecessary. You may skip checking the remaining vertical
scale settings in Table 4--3 (TDS 420A) or Table 4--4 (TDS 430A and TDS 460A)
(that is, skip the following substep, h) if this digitizing oscilloscope has p
assed
the 100 mV vertical scale setting just checked in this procedure and passed the
Verify Internal Adjustment, Self Compensation, and Diagnostics procedure found
under
Self Tests,
on page 4--5.