Tektronix 2245A Operator's Manual page 36

Controls, Connectors, and Indicators
The B sweep speed can never be slower than the A sweep
speed. When the two sweep speeds are the same, they are
" locked." At this point A will follow B to slower SECIDIV
settings (in ALT or B) and B will follow A to faster settings
(in A).
A SEC/DIV—The calibrated A sweep speed is selected only in A Hori­
zontal MODE from 0.5 s per division to 20 ns per division (X10 MAG
off).
B SEC/DIV—The calibrated B sweep speed is selected either in ALT
or B Horizontal MODE from 5 ms per division to 20 ns per division (X I0
MAG off).
(2?) A and B SEC/DIV VAR C ontrol—Provides continuously variable, un­
calibrated A and B sweep speeds to at least 2.5 times slower than the
calibrated SEC/DIV setting.
The VAR control extends the slowest A sweep speed to at least 1.25
sec per division. The UNCAL indicator is lit and a greater-than sign
(>) Is displayed before each SEC/DIV readout value when the sweep
speeds are greater than the SEC/DIV settings. The SEC/DIV settings
are calibrated when the VAR control is in the fully clockwise (detent)
position.
(2?) CURSORS/TIME POSITION C on trols—Set the reference and delta
cursors on the display.
The reference and delta cursors will only track together as
long as the reference delay plus the delta delay Is less than
10 times the A SEC/DIV setting (10 horizontal graticule divi­
sions). The cursors cannot be positioned left of the 1st or
right of the 11th vertical graticule lines.
k- OR DELAY—This control has the following functions:
1. Positions the reference and delta cursors together in the
CURSOR VOLTS, 1/TIME, or TIME measurement mode when
the Horizontal MODE is A (also X-Y for CURSOR VOLTS).
2-10
NOTE
NOTE
2245A Operators