Specifications
Triggering Sy
stem
Table 1-3: Triggering system
Characteris
tic
Description
Trigger Types Edge, Video, Pulse Width
Models Trigger source selections
TBS1052
TBS1102
TBS1062
TBS1042
TBS1022
Channel 1
Channel 2
External
External/5
AC Line
TBS1154
TBS1104
TBS1064
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 Ba
ndwidth Limit is selected for a channel, the bandwid th of that channel’s trigger path will also be
limited. The bandwidth of the External Trigger path is not affected by the bandwidth limit.
Horizo
ntal Trigger
Position
The tri
gger position is set by the Horizontal Position knob.
500 ns
minimum to 10 s maximum
Trigger Holdoff Range
The ab
ility to set large v alues of Holdoff is limited by the difficulty 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
oper
ation is turned off, and Holdoff can be adjusted at larger seconds/Div settings.
External Trigger Input
Impe
dance
1M±2
%inparallelwith20pF±3pF
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
Max
imum Input Voltage
Based on sinusoidal or DC input signal. T he maximum viewable signal while DC coupled is ±50 V offset
±5 V/div at 4 divisions, or 70 V. A C coupling allows measuring signals on a DC level up to 300 V. For
no
nsinusoidal waveforms, peak value must be less than 450 V. Excursions above 300 V s hould be less
than 100 ms duration and the duty factor is limited to < 44%. R MS signal level must be limited to 300 V. If
these v alues 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.
I
nput Amplitude requirements: 85 V
AC
- 265 V
AC
.
Input Frequency requirements: 45 Hz - 440 Hz.
Edge Trigger
Trigger Modes Auto, Normal
1–8 TBS1000 Series O scilloscope Service Manual
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