Typical Characteristics
TDS 420A, TDS 430A & TDS 460A Service Manual
1-25
Table 1- 19: Typical Characteristics — Triggering System
Name Description
Error, Trigger Position, Edge Triggering Acquire Mode Trigger-Position Error
1,2
Sample, Hi-Res, Average ±(1 WI + 1 ns)
Peak Detect, Envelope ±(2 WI + 1 ns)
Holdoff, Variable, Main Trigger, Internal Main Horizontal Scale Mini mum Holdoff Maximum Holdoff
Clock and non TV Trigger
≤100 ns/div 1 s 5 × Min Holdoff
≥100 ms/div 1s 5 × Min Holdoff
Otherwise 10 × sec/div 5 × Min Holdoff
Holdoff, Variable, External Clock 0to100ms
Auto Trigger Operation, External Clock Auto triggers 2 s after the last normal trigger or appropriated trigger mode is entered
Lowest Frequency for Successful Opera-
tion of “Set Level to 50%” Function
20 Hz
Sensitivity, Edge Trigger, Not DC Coupled
3
Trigger Coupling Typical Signal Level for Stable Triggering
AC Same as DC-coupled limits
4
for frequencies above
60 Hz. Attenuates signals below 60 Hz
Noise Reject Three and one-half times the DC-coupled limits
4
High Frequency Reject One and one-half times the DC-coupled limits
4
from
DC to 30 kHz. Attenuates signals above 30 kHz
Low Frequency Reject One and one-half times the DC-coupled limits
4
for
frequencies above 80 kHz. Attenuates signals below
80 kHz
Video Mode (Option 05 Equipped Instru-
ments Only)
Line Rate Class: Four cl asses are provided as follows
H NTSC, which provides a default l ine rate compatible with the NTSC standard
(525/60)
H PAL, which provides a default line rate compatible with the PAL standard (625/50)
H SECAM, which provides a default line rate compatible with the SECAM standard
(625/50)
H Custom, which provides user selectable line rate ranges (see Custom Line Rate
Ranges below)
Custom Line Rate Ranges: 15 kHz--20 kHz, 20 kHz--25 kHz, 25 kHz--35 kHz, and
35 kHz--64 kHz
Holdoff: Automatically adjusts to 58 ms (nominal) for NTSC class; to 150 ms (nominal) for
PAL and SECAM. A holdoff of 0 to 100 typically covers a range of 1 to 400 ms
Triggerable on Field Selections: Odd, Even, or Both
Delayed Acquisition: Settable for delay by line number or runs after time delay
Frequency, Maximum for Events Delay
5
90 MHz
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