Fluke 5522A Operators, Руководство оператора

Страница: 281 / 426

SC600 Oscilloscope Calibration Option
How to Calibrate the Time Base of an Oscilloscope
9
9-19
4.2 divisions, as shown below.
To increase the frequency slowly, fine-tune it using the rotary knob. To do this, press
e
to place a cursor in the Output Display, press
e
again to place it in the
frequency field, and use the
L
and
W
keys to move it to the digit you want to
change. Then change the value by turning the rotary knob. Continue making small
increments in the frequency until the signal drops to 4.2 divisions. At 4.2 divisions,
the signal is at the frequency that corresponds to the -3 dB point.
gl010i.bmp
6. Remove the input signal by pressing
Y
.
7. Repeat this procedure for the remaining channels on your oscilloscope.
How to Calibrate the Time Base of an Oscilloscope
The horizontal deflection (time base) of an oscilloscope is calibrated using a method
similar to the vertical gain calibration. A time marker signal is generated from the
Calibrator and the signal’s peaks are matched to the graticule line divisions on the
oscilloscope.
The Time Marker Function
The Time MARKER function, which is available through the MARKER menu, lets you
calibrate the timing response of your oscilloscope. To access the MARKER menu, press
the softkey under MODE until “marker” appears.
gjh058.eps
You can press the MODE softkey to cycle through the functions in the order shown, or
you can press
P
to return directly to the SCOPE menu.
Each option in the Marker menu is described below.
•
OUTPUT @ SCOPE terminal (50
Ω
) Indicates the location of the signal output.
If the signal does not appear on the oscilloscope, press
O
. To disconnect the
signal, press
Y
.
•
SHAPE Indicates the type of waveform. Depending on frequency setting, possible
selections are sine, spike, square (50 % duty cycle square wave), and sq20% (20 %