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Appendix D: Factory Initialization Settings
TDS 620A, 640A, & 644A User Manual
Table A-7: Factory Initialization Defaults (Cont.)
Control Changed by Factory Init to
Pulse runt high threshold 1.2 V
Pulse runt low threshold 0.8 V
Pulse runt trigger polarity Positive
Pulse trigger class Glitch
Pulse glitch filter state On (Accept glitch)
Pulse glitch width 2.0 ns
Pulse trigger level 0.0 V
Pulse trigger source
(Glitch, runt, and width)
Channel 1 (Ch1)
Pulse width trigger when ... Within limits
Pulse width upper limit 2.0 ns
Pulse width lower limit 2.0 ns
Pulse width trigger polarity Positive
Repetitive signal On
RS-232 parameters No change
Saved setups No change
Saved waveforms No change
Stop after R/S button
Vertical bandwidth (all channels) Full
Vertical coupling (all channels) DC
Vertical impedance (termination)
(all channels)
1 M
Vertical offset (all channels) 0 V
Vertical position (all channels) 0 divs.
Vertical volts/division (all channels) 100 mV/division
Zoom horizontal (all channels) 1.0X
Zoom horizontal lock All
Zoom horizontal position
(all channels)
50% = 0.5 (the middle of the
display)