Chroma 66203, Руководство пользователя

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Digital Power Meter 66203/66204 User’s Manual
4-40
Figure 4-61 EXTERNAL Wiring
Following is the procedure to set the ExtSH function:
1. Press
SETUP to select Meas. The Meas indicator is on.
2. Use
↑ , ↓ to select ExtSH function in 1
st
display window and press TRIG/ENTER to
confirm it.
3. Use ↑ , ↓ to select on in the 2
nd
display window and press TRIG/ENTER to confirm it.
When the EXT/SH indicator is on, it means the ExtSH function is enabled.
4. Use ↑ , ↓ to adjust the resistance in the 4
th
display window and press TRIG/ENTER to
confirm it.
5. When done, press SETUP to exit the menu.
Figure 4-62 Process for Setting ExtSH
1. The input impedance of the 66203/66204 EXT terminal is 100k Ω
that could affect the equivalent impedance of external shunt and the
measurement accuracy. Please use this function properly.
2. When the ExtSH function is enabled, the selection of current range
will change to EXT. Please see the section of range selection for
the detail of range setting.
3. Since the sensing voltage amplitude is small, the measurement
cable should be as short as possible to avoid signal interference
and affecting the accuracy. It is suggested to use twisted or
coaxial cable for measurement.
WARNING
1. The maximum input voltage allowed for EXT input terminal is
100mVrms.