Nominal Traits
1-8
TDS 420A, TDS 430A & TDS 460A Service Manual
Table 1- 3: Nominal Traits — Signal Acquisition System (Cont.)
Name Description
Rise Time
4
Volts/Div Setting Rise Time
(TDS420A)
5mV/div--10V/div 1.75 ns
2mV/div--4.98mV/div 2.33 ns
1mV/div--1.99mV/div 3.68 ns
Rise Time
4
Volts/Div Setting Rise Time
(TDS 430A and TDS 460A)
5mV/div--10V/div 875 ps
2mV/div--4.98mV/div 1.4 ns
1mV/div--1.99mV/div 3.5 ns
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 resolved by the 8-bit A-D Converter with the input scaled to the volts/division setting
of the channel used. Expressed as a voltage, a DL is equal to 1/25 of a division times the volts/division setting.
2
GND input coupling disconnects the input connector from the attenuator and connects a ground reference to the input of
the attenuator .
3
The sensitivi ty ranges from 1 mV/ div to 10 V/ div in a 1 - 2 - 5 sequence of coarse settings. Between consecutive
coarse settings, the sensitivi ty can be finel y adjusted with a resolution of 1% of the more sensitive setting. For
example, between 50 m V/div and 100 m V/div, the volts/di vision can be set with 0. 5 mV resolution.
4
Rise time is defined by the following formula:
Rise Time (ns) =
420
BW (MHz)
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