Automatic Ranging Measurements - Extech Instruments MS420 User Manual

Auto-calibration
The Auto-calibration function automatically configures internal parameters to maintain the
sensitivity and accuracy of the meter. Use the Auto-calibration in the following cases:
• When the temperature changes by more than 5 degrees Celsius during operation
When operating the oscilloscope in a new bench top or field environment
•
1. Press MENU and select the FUNCTION menu using the MENU ▲ or MENU ▼ key
2. Press F2 (Auto calibration). A message appears asking the user to remove all cables
and probes from the oscilloscope
3. After removing all cables, press F2 (Auto calibration) again. The Auto-calibration
automatically starts and a status message appears.
To interrupt calibration, press any key during the calibration.
A R
UTOMATIC ANGING
The oscilloscope can perform twenty (20) automatic measurements: Frequency,
cycle, average, peak-to-peak, root mean square, Vmax, Vmin, Vtop, Vbase, Vamp,
overshoot, pre-shoot, rise time, fall time, +width, -width, +duty, -duty, delayA B
and delayA B . Two measurement results can be displayed simultaneously on the
screen. The function menu for automatic measurements is described in the following
Table.
Function menu
Freq
Period
Mean
Peak-Peak
Cyc RMS
Vmax
Vmin
Vtop
M
EASUREMENTS
Settings
Description
CH1 Measure the frequency of CH1
CH2 Measure the frequency of CH2
CH1 Measure the period of CH1
CH2 Measure the period of CH2
CH1 Measure the average value of CH1
CH2 Measure the average value of CH2
CH1 Measure the peak-to-peak value of CH1
CH2 Measure the peak-to-peak value of CH2
CH1 Measure Root Mean Square (RMS) value of CH1
CH2 Measure Root Mean Square (RMS) value of CH2
CH1 Measure the Vmax of CH1
CH2 Measure the Vmax of CH2
CH1 Measure the Vmin of CH1
CH2 Measure the Vmin of CH2
CH1 Measure the Vtop of CH1
CH2 Measure the Vtop of CH2
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