Performance Tests
4-20
TDS 420A, TDS 430A & TDS 460A Service Manual
Signal Acquisition System Checks
These procedures check those characteristics that relate to the signal-acquisition
system and are listed as checked under Warranted Characteristics in Chapter 1,
Specification.
Equipment
Required
Two dual-banana connectors (Item 7)
One BNC T connector (Item 8)
One DC calibration generator (Item 10)
Two precision coaxial cables (Item 5)
Prerequisites See page 4--15.
1. Install the test hookup and preset the instrument controls:
a. Hook up the test-signal source:
H Set the output of a DC calibration generator to 0 volts.
H Connect the output of a DC calibration generator through a
dual-banana connector followed by a 50 Ω precision coaxial cable to
one side of a BNC T connector (see Figure 4--4).
H Connect the Sense output of the generator through a second
dual-banana connector followed by a 50 Ω precision coaxial cable to
the other side of the BNC T connector. Now connect the BNC T
connector to CH 1.
Digitizing Oscilloscope
DC Calibrator
50 Ω Coaxial Cables
Dual Banana to
BNC Adapters
BNC T
Connector
Output Sense
Figure 4- 4: Initial Test Hookup
Check Offset Accuracy
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