Tektronix 475A - Delayed or Mixed Sweep Magnification; Magnified Sweep Starts after Delay

DELAYED OR MIXED
SWEEP MAGNIFICATION
The delayed sweep features of the 475A can be used to
provide higher apparent magnification than is provided by
the X10 MAG switch. The sweep rate of the delayed sweep
(B sweep) is not actually increased; the apparent
magnification is the result of delaying the B sweep in an
mount of time selected by the A TIME/DIV switch and the
ELAV-TIME POSITION control before the display is
nted at the sweep rate selected by the B TIME/DIV
The following method uses the STARTS AFTER
DELAY position of the B Trigger SOURCE switch to allow
the delayed portion to be positioned with the DELAY-
TIME POSITION control. If there is too much jitter in the
delayed display, use the Triggered B Sweep mode of
operation.
Magnified Sweep Starts After Delay
1. Connect the signal to either input connector. Set the
VERT MODE switch to display the channel used.
2. Set the VOLTS/DIV switch to produce a display
about four divisions in amplitude.
” 3. Set the A TIME/DIV switch to a sweep rate which
displays the complete waveform.
4. Set the HORIZ DISPLAY switch to A INT and the B
Trigger SOURCE switch to STARTS AFTER DELAY.
instrument equipped with DMAA. Verify that the FUNC-
TION switch is not set to TIME or 1/TIME.
5. Position the start of the intensified zone with the
DELAY-TIME POSITION control to the part of the display
to be magnified.
6. Set the B TIME/DIV switch to a setting which
intensifies the full portion to be magnified. The start of the
intensified zone remains as positioned above (see Fig. 24).
7. Set the HORIZ DISPLAY switch to B DLY'D to
magnify the partion of A sweep that is intensified (see Fig.
24).
8. Time measurements can be made from the display
in the conventional manner. The sweep rate is determined
by the setting of the B TIME/DIV switch.
9. The apparent sweep magnification can be
calculated by dividing the A TIME/DIV switch setting by
the B TIME/DIV switch setting.
e
|
475A/DM44
Operators
45