Tektronix TDS1001C-EDU, Service Manual

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Speci fi cations
Table 3: Triggering system (cont.)
Characteristic Description
Trigger Source Sensitivity
AC Same as DC Coupled limits for frequencies 50 Hz and
above
Noise Rej Effective in Sample or Average Mode, > 10 mV/div to
5 V/div. Reduces DC Coupled trigger sensitivity by 2X.
HF Rej Same as DC Coupled limits from DC to 7 kHz.
LF Ref Same as DC Coupled limits for frequencies above 300 kHz.
Sensitivity,
Edge-Type Trigger,
non-DC Coupled,
typical
Since AC coupling is not done in the front end, use of a 10M probe does not affect the low frequency
corner.
50 Hz.
Lowest Frequency
for Successful
Operation of “Set
Level to 50%”
Function, typical
Using a 10M probe will not affect the operation of this function.
Input Channel ±8 divisions from center screen
Ext ±1.6 V
Ext/5: ±8 V
Trigger Level
Ranges, typical
The settable resolution for Trigger Level is 0.02 division for an input channel source, 4 mV for Ext source,
and 20 mV for Ext/5 source.
This is the amount of deviation allowed between the level on the waveform at which triggering occurs and
the level selected for DC-coupled triggering signals
±(0.2 div + 5 mV) for signals within ±4 divisions from the center screen, having rise and fall times
of
≥ 20 ns.
Ext: ±(6% of s 40 mV) for signals less than ±800 mV
Trigger Level
Accuracy, DC
Coupled, typical
Ext/5: ±(6% of s 200 mV) for signals less than ±4 V
Video Trigger
Trigger Mode: Auto Default Settings
for Video Trigger
Trigger Coupling: AC
Video Trigger
Source Selection Same as Trigger Source Selections listed above except Line Trigger. Line Trigger source is meaningless
in this mode.
Video Trigger
Polarity Selection Normal (Negative going Sync Signal), Invert (Positive going Sync Signal)
Video Sync
Selection Line, Line #, Odd Field, Even Field, Field: PAL/SECAM, NTSC formats
Field rates: 50 Hz to 60 Hz. Video Trigger
Formats and Field
Rates
Line rates: 15 kHz to 20 kHz (NTSC, PAL, SECAM)
TDS2000C and TDS1000C-EDU Series Oscilloscope Service Manual 11