Cal Test CT3687 Podręcznik użytkownika - Strona 9
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Drukuj stronę3.5 Vertical Scale on Oscilloscope
The actual vertical scale of the oscilloscope is equal to the attenuation
factor multiplied by the range of vertical scale selected on the
oscilloscope. For example, with the CT3686 set on attenuation 10x, the
oscilloscope on 0.5 V/div, the real vertical scale is 10 x 0.5 = 5 V/div.
With the probe on 100x, the real vertical scale is 100 x 0.5 = 50 V/div.
These values apply when the oscilloscope is set to the typical 1 MΩ
impedance input. When the oscilloscope is set to 50 Ω input, the actual
vertical scale will be doubled: 10 V/div for the 10x setting and 100 V/div
for the 100x setting. See Table 1.
Vertical Scale on Oscilloscope
Scope Input
Impedance
Attenuation
1 MΩ
1 MΩ
50 Ω
50 Ω
Table 1 Oscilloscope Readings
Offset Zero Procedure
The CT3686 and CT3687 can be adjusted to zero the probe's offset
voltage using the offset adjustment tool supplied with the probe. Follow
this procedure to perform the offset adjustment.
1.
Connect the probe to Channel 1 of the oscilloscope. Turn
on the probe power. You may use the USB power cable or
batteries to power the probe. Set the probe attenuation ratio
to the low setting (10x for CT3686 and 100x for CT3687).
2.
Short the + and - probe inputs together with the hook tips.
3.
Turn on power to the oscilloscope. Leave both the
800-572-1028
Probe
Actual
Attenuation
Setting
Setting
10x
10x
100x
100x
10x
20x
100x
200x
caltestelectronics.com
Vertical Scale
Actual Vertical
Reading on the
Oscilloscope
0.5 V/div
0.5 V/div
0.5 V/div
0.5 V/div
Scale of the
Oscilloscope
5 V/div
50 V/div
10 V/div
100 V/div
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