GW Instek GOS-6200 - Manual (Page 12)

GOS-6200 OSCILLOSCOPE
USER MANUAL
⎯ 18 ⎯
Horizontal controls:
The horizontal controls select the time base operation mode and adjust the
horizontal scale, position and magnification of the signal.
(21)TIME/DIV– Control knob with double function.
Turning the knob clockwise to reduce the deflection coefficient in a
1-2-5 sequence and turning it in the opposite direction (CCW) to
increase. The time coefficient(s) will be displayed in the readout.
In MAIN time base (MTB) mode, time deflection coefficients between
0.5s/div and 20ns/div can be chosen in 1-2-5 sequence, if the ×10
MAG function is not activated.
During alternate (ALT) and DELAY time base (DTB) operation, the
control knob changes the DELAY time base setting in 1-2-5 sequence.
The available deflection coefficient range is from 50ms/div up to
20ns/div (without ×10 MAG), but the availability depends on the
MAIN time base setting. The internal control of the oscilloscope
prevents the DELAY time deflection coefficient from becoming higher
than the MAIN deflection coefficient, as such an operation condition
would make no sense.
GOS-6200 OSCILLOSCOPE
USER MANUAL
⎯ 19 ⎯
(22)MAIN/ALT/DELAY— Pushbutton for time base mode selection.
The instrument contains two-time base designated MAIN and DELAY.
With the aid of the DELAY time base, signal parts displayed by the
MAIN time base can be expanded in X-direction. The expansion ratio
depends on the time deflection coefficient ratio of both time bases (ie.
“MTB=0.1ms”, “DTB=1μs”=100:1). With higher expansion ratio the
DELAY time base trace intensity reduces. Each time when press the
pushbutton briefly, the time base mode changes in the sequence of
MAIN-ALT-DELAY-MAIN. The actual setting is displayed in the
readout.
MAIN
The TIME/DIV control knob is operated only under the MAIN time
base mode. The readout then displays the main time coefficient alone.
The time base setting for this condition will be stored if the time base
mode is changed.
ALT
If the alternate time base mode is selected, the TIME/DIV knob only
controls the DELAY time base switch. The alternate time base mode is
a sub-function of the DELAY time base mode and both time base
traces can be displayed simultaneously. Consequently the readout can
display both time deflection coefficient. A window sector which
indicates part of signal is also visible on the MAIN trace and is
displayed by the DELAY time base.
The window segment can be shifted horizontally by the DELAY TIME
control continuously. The difference between the beginning of both the
MAIN time base trace and the window sector shows the delay time.
The information is also displayed in the readout with an approximate
value (e.g. “DLY=0.125ms”) related to the calibrated MAIN time
coefficient (uncalibrated i.e. “DLY>0.125ms”). The width of the