OS-10V 02/04/2001 Rev.2
7
(3)
X-Y OPERATION: When [10] set at EXT/X, The oscilloscope is used for X-Y
operation, at this moment Input [18] is Y-axis with the same sensitivity, Input [13] as
X-axis, [14] can be adjusted continuously within 0.2V/DIV~0.5V/DIV.
3.3.4 TRIGGER SOURCE
In Fig 3-1, [12] provides 3 sources for selection, INT trigger
､
EXT trigger input from
[13], LINE input from power source.
3.3.5 HORIZONTAL SYSTEM OPERATION
(1)
Sweep setup : turn the sweep switch to correct position according to signal frequency,
adjust POSITION [7] to show the whole waveform within available area. Adjust with
VAR [8] if necessarily, trimming ratio is
≧
2.5:1.
(2)
There are 3 kinds of Trigger sources: [11]
“
AUTO
＂
auto sweep, when triggering
signal is applied, Level [9] will adjust to proper position. The screen showing steady
free run wave required frequency higher than 20Hz; [11]
“
NORM
＂
while waiting
for sweep, no trace; when receiving input signal, the circuits was triggered to sweep
and show waveform . [11]
“
TV” used to determine TV signal. The signal is
negative.
(3)
SLOPE selection: Used to select whether the trigger signal crosses trigger level in a
positive-going or a negative-going direction.
(4)
Level setup : Use to adjust signal sweep on a level as starting reference.
3.3.6 SIGNAL CONNECT
(1)
Probe operating :
Use 10:1 to 1:1 alternating probes. When using 10:1 probe, input impedance is
10M
Ω
16 pF. While if 1:1 is used for observing lower signal, input impedance is
1M
Ω
30 pF. At this stage, please consider of the affection of the probe upon the
detected circuits.
(2)
Probe Adjustment
Before using , 10:1 probe must be adjusted correctly, see Point 4.1.2
4 Measurement
4.1 EXAMINATION AND ADJUSTMENT BEFORE MEASUREMENT
In order to be more accurate and prevent errors, the following observations should be
done before taking measurement.
4.1.1 TRACE ROTATION
Generally, horizontal trace on the screen should parallel with the horizontal line. Due to
the earth’s magnetic field and other factors which causes horizontal trace leaning and
making errors, you must examine the followings before taking measurement:
(1)
Adjust components on the front panel to obtain a horizontal trace on the screen .
(2)
Adjust vertical position and make sweep baseline lied in horizontal line of vertical
center
(3)
Examine whether sweep baseline is parallel with horizontal line, if not , please
following point 3.3.2(3) to correct it .
4.1.2 PROBE COMPENSATION
Adjustment of probe is useful to compensate mistakes cause by difference of
oscilloscope input characteristic:
(1)
Follow step 3.3.2, setup front panel components, and obtain a sweep baseline.
(2)
Set VOLTS/DIV to 10mV/DIV.
