Controls, Connectors, and Indicators—2445 Operators
(S ) X10 MAG Switch—Horizontally magnifies the por
tion of the sweep display positioned at the center
vertical graticule line by a factor of 10 when pressed
in. When the A trace and the B trace are displayed
alternately (TURN-ALT Horizontal Display Mode
selected), only the B trace is magnified. Using X10
magnification extends the fastest sweep speed to 1 ns
per division. The push button must be pressed in a
second time to release it and regain the X I sweep-
speed magnification.
(29) AV Switch—Activates the Delta Volts (AV) measure
ment function, when momentarily pressed in alone,
and cancels any other Delta measurement function
in effect. In the A Sweep mode (A and B SEC/DIV
switches locked together), two horizontal cursors
are superimposed on the crt display. The crt readout
displays the equivalent voltage represented by the
separation between the two cursors. The position of
one cursor on the display is set by the A REF OR
DLY POS control and the position of the other is
set by the A control. With multiple-channel displays,
the deflection factor of the first channel selected in
the display sequence determines the scale factor of
the Delta Volts readout on the crt. The Delta Volts
readout is displayed as a percentage ratio if either one
of the following conditions exists: (1) the channel
determining the scale factor is uncalibrated (VAR
control out of detent), or (2) ADD is displayed alone
when the Channel 1 and Channel 2 deflection factors
are not the same (VOLTS/DIV switches are at dif
ferent settings or are uncalibrated). Either pressing in
the AV switch or pulling the B SEC/DIV knob to
the out position when the Delta Volts function is
active, cancels it. Attempting to activate the Delta
Volts function while the A and B SEC/DIV knobs
are unlocked causes the message NO AV WITH
DELAY to appear in the top row of the crt readout.
If displayed, the error message will be canceled
(removed from the display) by any of the following
actions: pressing either the AV or At switch; pushing
in the B SEC/DIV if it is out or pulling it out if it is
in; or locking the A and B SEC/DIV knobs together
(set to the same sweep speed with the B SEC/DIV
knob in).
At Switch—Activates the Delta Time measurement
function and cancels any other Delta measurements
in effect, when momentarily pressed in alone. When
the Delta Time function is active, momentarily
pressing in the At push button cancels the function.
When the A and B SEC/DIV knobs are locked together
(A trace only), two vertical cursors are superimposed
on the crt display while the Delta Time function is
active. In any of the delay-time Horizontal Display
modes (PULL-INTEN, TURN-ALT, or PUSH-B),
two separate delay times are established by the
Delta Time function. One cursor position (or delay
time) is set by the A REF OR DLY POS control,
and the other is set by the A control. The crt readout
displays either the time difference between the two
delays or the equivalent time difference between the
two vertical cursors.
If the SEC/DIV VAR control is not in the detent
position. At cursor difference on the A trace only
displays is expressed as a ratio, with five divisions
corresponding to a 100% ratio. For the delay-time
Horizontal Display modes, the SEC/DIV VAR
control varies the B-sweep scale factor as it is rotated,
but it has no effect on the delay time.
Pressing in the AV and At push buttons together
activates the 1/At measurement function and cancels
any other Delta measurement functions in effect. The
crt waveform display and operation of both the A
REF OR DLY POS and A controls remain the same
as explained for At operation. However, with 1/At
selected, the crt readout shows the reciprocal of the
time-difference measurement, with units being
frequency (Hz, kHz, MHz, or GHz).
For A trace only displays, with the SEC/DIV VAR
control out of the detent (fully clockwise) position,
the time difference between 1/At cursors is displayed
in degrees of phase, with five divisions equal to 360
degrees. As with At measurements, the position of
the SEC/DIV VAR control has no effect on delay
time displays except to change the B Sweep scale
factor, and the readout remains in units of frequency.
When the 1/At function is active, pressing both the
AV and the At push buttons together cancels the
function and exits the Delta measurement mode.
Pressing either AV or At alone cancels the 1/At
function and activates the function associated with
the button pressed.
(3?) A REF OR DLY POS Control—Sets the reference B
Sweep delay time or positions the Reference cursor
when AV, At, or 1/At Measurement Mode is active.
When any delay-time Horizontal Display Mode
(PULL-INTEN, TURN-ALT, or PUSH-B) is selected,
the reference B Sweep delay time is determined by
the rotation of the A REF OR DLY POS control in
conjunction with the A SEC/DIV switch setting.
This control produces fine resolution over a portion
of its range, after which it changes to coarse reso
lution. It reenters the fine-resolution range upon
reversing the direction of rotation.
3-6
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