Operation
If you magnify the vertical display beyond the graticule, the trigger may be
degraded.
To avoid trigger overload, use one channel for display and another channel
with an appropriate video signal as the trigger source. A composite sync signal can be
used for the trigger source as well as composite video.
Readout
To aid waveform interpretation, the readout shows scale factors, delta
measurements, delay times, trigger settings, and other information. To display all readout
information, set the READOUT INTENSITY control clockwise from OFF (SCALE
FACTORS ON). See Figure 2-1.
Trigger Readout
The trigger readout shows which trigger (A or B) is affected by the controls
(Mode, Source, Coupling, Slope, Level, and INIT@50%), which channel (1-4) is
supplying the trigger signal, and the voltage at which triggering takes place, with
the following settings:
Trigger Coupling DC or Noise Reject
Trigger Source Any Single Channel
Vertical Input DC or GND
VOLTS/DIV VAR Fully Clockwise.
If the trigger comes from the word recognizer, which is available with the CTT,
the readout shows the defined word.
For instruments with serial numbers B049999 and below with firmware
version 11 and above or for instruments with serial numbers B050000 and
above with firmware version 2 and above (see Appendix A - EXER04 to
determine firmware version), then all AC trigger couplings (HF Reject, LF
Reject, and AC or AC input coupling provide an indication of the trigger level
setting.
The readout in these modes indicates a reference level (not absolute
value) XXXX and is followed by a "V?" to indicate the relative nature of the
readout.
For instruments with serial numbers B049999 and below with firmware
version 10 and below or for instruments with serial numbers B050000 and
above with firmware version 1 and below (see Appendix A - EXER04 to
determine firmware version), the trigger readout works only when trigger
coupling is DC or Noise Reject, when the trigger source is one, dc-coupled,
vertical channel with VOLTS/DIV VAR in its calibrated position.
Readout Intensity
To display nothing but measurements, set the READOUT INTENSITY control
counterclockwise from OFF (SCALE FACTORS OFF). Rotate the control toward
OFF to decrease readout brightness. When the sweep is faster than
50 jis/division, random 2-jis segments of the waveform may be missing. Set the
control near the center of the word "OFF" to eliminate this interference between
the waveform and the readout.
2-10
2465B/2455B/2445B Operators
To Next Page
Need help?
General
