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TDS 684A, TDS 744A, & TDS 784A Service Manual
1–9
Nominal Traits
This section contains a collection of tables that list the various nominal traits
that describe the TDS 684A and 7XXA oscilloscopes. Electrical and mechanical
traits are included.
Nominal traits are described using simple statements of fact such as “Four, all
identical” for the trait “Input Channels, Number of,” rather than in terms of
limits that are performance requirements.
Table 1–3: Nominal Traits — Signal Acquisition System
Name Description
Bandwidth Selections 20 MHz, 250 MHz, and FULL
Samplers, Number of Four, simultaneous
Digitized Bits, Number of 8 bits
1
Input Channels, Number of Four
Input Coupling DC, AC, or GND
Input Impedance Selections
1 MW or 50 W
Ranges, Offset
Volts/Div Setting Offset Range
Ranges, Offset
1 mV/div – 100 mV/div
101 mV/div – 1 V/div
1.01 V/div – 10 V/div
±1 V
±10 V
±100 V
Range, Position ±5 divisions
Range, 1 MW Sensitivity 1 mV/div to 10 V/div
2
Range, 50 W Sensitivity 1 mV/div to 1 V/div
1
1
Displayed vertically with 25 digitization levels (DLs) per division and 10.24 divisions dynamic range with zoom off. A DL
is the smallest voltage level change of the oscilloscope input that can be resolved by the 8-bit A-D Converter. Expressed
as a voltage, a DL is equal to 1/25 of a division times the volts/division setting.
2
The sensitivity ranges from 1 mV/div to 10 V/div (for 1 MW) or to 1 V/div (for 50 W) in a 1–2–5 sequence of coarse settings
with Fit-to-Screen off. Between coarse settings, the sensitivity can be finely adjusted with a resolution equal to 1% of the
more sensitive coarse setting. For example, between 50 mV/div and 100 mV/div, the volts/division can be set with 0.5 mV
resolution.