VOLTCRAFT AO-610, User Manual

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9
free run waveform requires a frequency higher than 20Hz; [11]
“
NORM
”
while
waiting for sweep with no trace. When an input signal occurs the scope is triggered to
sweep
(3)
and show the waveform . [10]
“
TV” used to determine TV signals.
(4)
SLOPE selection: Used to select whether the trigger signal crosses trigger level in a
positive or a negative-going direction.
(5)
Level setup : Use to adjust signal sweep on a level at a starting reference.
3.3.6 SIGNAL CONNECT
(1) Probe operation :
Use 10:1 to 1:1 switchable probes. When using 10:1 probe, input impedance is 10M Ω
16 pF. While if 1:1 is used for observing a signal, input impedance is 1M Ω 30 pF. At
this stage, please consider the affect of the probe in certain 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 ensure accuracy and prevent errors, the following observations should be made
before taking a measurement.
4.1.1 TRACE ROTATION
The horizontal trace on the screen should be parallel with the horizontal line. Due to the
earth’s magnetic field and other factors which causes horizontal trace leaning you must
examine the following before taking measurements:
(1) Adjust the front panel control to obtain a horizontal trace on the screen .
(2) Adjust the vertical position control to ensure the horizontal line in is centered.
(3) If the horizontal line/trace is not level, then please following point 3.3.2(3) to correct
it .
4.1.2 PROBE COMPENSATION
Adjustment of the probe is required to compensate for the variations caused by difference
in oscilloscope input characteristics:
(1) Follow step 3.3.2, setup front panel controls, and obtain a sweep baseline.
(2) Set VOLTS/DIV to 10mV/DIV.
(3) Connect CH1 10:1 probe to input terminal, and connect to the “CAL” terminal.
(4) Follow Chapter 3 to operate relative controls, to obtain a waveform on the screen as