Displaying An Unknown Signal With Auto Set; Automatic Zero-Ing Of Trigger Horizontal Position And Trigger Level Position; Automatic Measurements - Extech Instruments MS400 User Manual

Displaying an Unknown Signal with Auto Set

The Auto-Set feature allows the Oscilloscope to display and measure unknown signals
automatically. This function optimizes the position, range, time-base, and triggering and
assures a stable display of virtually any waveform. This feature is especially useful for
quickly checking multiple signals.
To enable the Auto-Set feature:
1. Connect the test probe to the signals under test.
2. Press the AUTOSET key. The Oscilloscope is now in the automatic measurement
mode. The tested signals appear on the screen.
Automatic Zero-Returning of Trigger Horizontal Position and
Trigger Level Position
When the trigger horizontal position and trigger level position are adjusted to maximum,
they will become positioned off-screen. The following steps will allow the trigger horizontal
position and trigger level position to return to zero automatically:
1. Press the OSC LEFT key and the OSC RIGHT key simultaneously, the trigger
horizontal position automatically returns to zero.
2. Press the OSC UP and the OSC DOWN buttons simultaneously, the trigger level
position automatically returns to zero.

Automatic Measurements

The Oscilloscope offers 5 ranges of automatic scope measurements. Two numeric
readings can be displayed: measurement 1 and measurement 2. These readings are
selectable independently and the measurements can be performed on the input CH1 or
input CH2 waveform.
To choose a frequency for CHI1:
1. Press the MENU key. The function menu appears on the right side of the screen.
2. Press the MENU UP or the MENU DOWN key to select MEAS SET1. Five selectable
items are visible at the bottom of the screen.
3. Press the F1 key and select Freq CH1 from the mean square root value item. The
measurement 1 window turns red in color and shows the frequency for input CH1.
To choose a Peak-Peak measurement for Input CH2:
1. Press the MENU key. The function menu is displayed on the right side of the screen.
2. Press the MENU UP or the MENU DOWN key and select MEAS SET2, with 5
selectable items displayed at the bottom of the screen.
3. Press the F4 key to select PK-PK CH2 from Peak-Peak item. The measurement 2
window turns blue in color and shows the peak-peak value for input CH2.
Figure 12: Automatic Scope Measurements
18 MS400 Version 2.0 – December 2007