Tektronix TDS1001C-EDU, Service Manual

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Speci fi cations
Triggering System
Table 3: Triggering system
Characteristic Description
Trigger Types Edge, Video, Pulse Width
Models Trigger source selections
TDS1001C-EDU
TDS1002C-EDU
TDS1012C-EDU
TDS2001C
TDS2002C
TDS2012C
TDS2022C Channel 1
Channel 2
External
External/5
AC Line
TDS2004C
TDS2014C
TDS2024C Channel 1
Channel 2
Channel 3
Channel 4
External
External/5
AC Line
Trigger Source
Selection
External/5 selection attenuates the external signal by 5.
When Bandwidth Limit is selected for a channel, the bandwidth of that channel’s trigger path will also be
limited. The bandwidth of the External Trigger path is not affected by the bandwidth limit.
Horizontal Trigger
Position The trigger position is set by the Horizontal Position knob.
500 ns minimum to 10 s maximum Trigger Holdoff Range
The ability to set large values of Holdoff is limited by the dif fi culty in adjusting the Holdoff at Sec/Div
settings less than 100 ms/Div. This is because Holdoff cannot be set in Scan Mode, which begins at
100 ms/div when Trigger Mode is AUTO. By adjusting Trigger Mode to NORMAL, the Scan Mode
operation is turned off, and Holdoff can be adjusted at larger seconds/Div settings.
External Trigger Input
Impedance 1 M ±2% in parallel with 20 pF ±3 pF
300 V
RMS
, Installation Category II; derate at 20 dB/decade above 100 kHz to 13 V peak AC at 3 MHz
and above
External Trigger
Maximum Input Voltage
Based on sinusoidal or DC input signal. The maximum viewable signal while DC coupled is ±50 V offset
±5 V/div at 4 divisions, or 70 V. AC coupling allows measuring signals on a DC level up to 300 V. For
nonsinusoidal waveforms, peak value must be less than 450 V. Excursions above 300 V should be less
than 100 ms duration and the duty factor is limited to < 44%. RMS signal level must be limited to 300 V. If
these values are exceeded, damage to the instrument may result.
Line Trigger
Characteristics Line Trigger mode provides a source to synchronize the trigger with the AC line input.
Input Amplitude requirements: 85 V
AC
- 265 V
AC
.
Input Frequency requirements: 45 Hz - 440 Hz.
Edge Trigger
Trigger Modes Auto, Normal
TDS2000C and TDS1000C-EDU Series Oscilloscope Service Manual 9