Tektronix 2440, User Manual

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Specification— 2440 Service
Table 1-1 (cont)
Characteristics Performance Requirements
TRIGGERING— A and B
Minimum P-P Signal Amplitude for Stable3 Triggering
from Channel 1, Channel 2, or ADD Source
A Trigger
DC Coupled
0.35 division from DC to 50 MHz, increasing to 1.0 division at
300 MHz; 1.5 divisions at 300 MHz in ADD mode.
NOISE REJ Coupled
1.2 divisions or less from DC to 50 MHz; increasing to 3 divisions
at 300 MHz; 4.5 divisions at 300 MHz in ADD mode.
AC Coupled
0.35 division from 60 Hz to 50 MHz; increasing to 1.0 division at
300 MHz; 1.5 divisions at 300 MHz in ADD mode. Attenuates
signals below 60 Hz.
HF REJ Coupled
0.50 division from DC to 30 kHz. Attenuates signals above
30 kHz.
LF REJ Coupled 0.50 division from 80 kHz to 50 MHz; increasing to 1.0 division at
300 MHz; 1.5 divisions at 300 MHz in ADD mode. Attenuates
signal below 80 kHz.
B Trigger Multiply all A Trigger specifications by two.
A.B Selected Multiply all A Trigger specifications by two.
Minimum P-P Signal Amplitude for Stable Triggering3
from EXT TRIG 1 or EXT TRIG 2 Source
A Trigger
EXT Gain = 1
DC Coupled
17.5 mV from DC to 50 MHz, increasing to 50 mV at 300 MHz.
NOISE REJ Coupled 60 mV or less from DC to 50 MHz; increasing to 150 mV at
300 MHz.
AC Coupled 17.5 mV from 60 Hz to 50 MHz; increasing to 50 mV at 300 MHz.
Attenuates signals below 60 Hz.
HF REJ Coupled 25 mV from DC to 30 kHz.
LF REJ Coupled 25 mV from 80 kHz to 50 MHz; increasing to 50 mV at 300 MHz.
EXT Gain = - 5 Amplitudes are five times those specified for Ext Gain = 1.
B Trigger Multiply all A Trigger amplitude specifications by two.
A.B Selected Multiply all A Trigger amplitude specifications by two.
aA stable trigger is one that results in a uniform, regular display triggered on the selected slope ( ± ) . A stably-triggered display
should NOT have the trigger point switch between opposite slopes on the waveform, nor should it “roll” across the screen, as suc­
cessive acquisitions occur. At TIME/DIV settings of 2 ms/DIV and faster, the TRIG’D LED is constantly lit if the display is stably
triggered (the LED can flash for SEC/DIV settings of 10 ms/DIV and slower).
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