Tektronix 410, Service Manual

Page: 45 / 275

Typical Characteristics
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
1Ć19
Table 1-16: Typical Characteristics — Time Base System
Name Description
Aperture Uncertainty For real-time or interpolated records having duration
≤
1 minute:
≤
(50 ps + 0.03 ppm Record Duration) RMS
For equivalent time records:
≤
(50 ps + 0.06 ppm WI
1
) RMS
Fixed Error in Sample Time
≤
50 ps
1
The WI (waveform interval) is the time between the samples in the waveform record. Also, see the footnotes for Sample Rate
Range and Equivalent Time or Interpolated Waveform Rates in Table 1-3 on page 1-8.
Table 1-17: Typical Characteristics — Triggering System
Name Description
Error, Trigger Position, Edge Triggering Acquire Mode
Sample, Hi-Res, Average
Peak Detect, Envelope
Trigger-Position Error
1,2
ns)
ns)
Holdoff, Variable, Main Trigger
Main Horizontal Scale
≤
100 ns/div
≥
100 ms/div
Otherwise
Minimum
Holdoff
1
m
s
1 s
10 sec/div
Maximum Holdoff
5 Min Holdoff
5 Min Holdoff
5 Min Holdoff
Lowest Frequency for Successful Op-
eration of “Set Level to 50%” Function 20 Hz
Sensitivity, Edge Trigger, Not DC
Coupled
3
Trigger Coupling
AC
Noise Reject
High Frequency Reject
Low Frequency Reject
Typical Signal Level for Stable Trig-
gering
Same as DC-coupled limits
4
for frequen-
cies above 60 Hz. Attenuates signals
below 60 Hz.
Three and one-half times the DC-coupled
limits.
4
One and one-half times the DC-coupled
limits
4
from DC to 30 kHz. Attenuates
signals above 30 kHz.
One and one-half times the DC-coupled
limits
4
for frequencies above 80 kHz.
Attenuates signals below 80 kHz.
1
The trigger position errors are typically less than the values given here. These values are for triggering signals having a slew rate
at the trigger point of division/ns.
2
The waveform interval (WI) is the time between the samples in the waveform record. Also, see the footnote for the character-
istics Sample Rate Range and Equivalent Time or Interpolated Waveform Rates in Table 1-3 on page 1-8.
3
The minimum sensitivity for obtaining a stable trigger. A stable trigger results in a uniform, regular display triggered on the
selected slope. The trigger point must not switch between opposite slopes on the waveform, and the display must not “roll” across
the screen on successive acquisitions. The TRIG’D LED stays constantly lighted when the SEC/DIV setting is 2 ms or faster but
may flash when the SEC/DIV setting is 10 ms or slower.
4
See the characteristic Sensitivity, Edge-Type Trigger, DC Coupled in Table 1-11, which begins on page 1-15.