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Application example
The following application example is for power supply testing. For basic overview and switching, refer to
tests performed, refer to the provided code
as well as how forms work in Visual Basic, is required to fully understand the example.
Figure 8
Simplified connection schematic (one power supply shown)
High Line
~
7705
Ch1
Figure 9
Visual basic application example—power supply testing
'' ---------------------------------------------------------------------------------------------------------------------
'' 7711 Application Example
'' ---------------------------------------------------------------------------------------------------------------------
'' This program tests a set of power supplies using a 2750 loaded with a 7700,
'' 7711, and a 7705.
''
'' The following occurs:
'' 1)
The 7700 takes DCV, ACV, 2W OHMS (CONT), and TEMP measurements.
'' 2)
Limits are used in each of the measurements by the 7700.
''
A)
DCV limits are set to 10% of the power supply's output.
''
B)
ACV limits are 108 and 132V.
''
C)
2W OHMS limits are
''
D)
TEMP limits are 70
''
'' 3)
RF switching to an oscilloscope is obtained using a 7711 where the AC ripple
''
is measured.
''
'' 4)
A 7705 is used to switch loads and to control the line input voltage
''
to the DUTs (power supplies).
''
'' Please note:
''
The maximum number of power supplies that can be used with this example is 4.
'' ---------------------------------------------------------------------------------------------------------------------
18
(Figure
9). Basic knowledge for Visual Basic functions, such as the CStr() function,
OUT A
Ch1
7711
Low Line
~
132V
108V
7705
Ch11
-0.01 and 2 ohms.
and 125 C.
7711-SMA-BNC
Cable
Thermocouple
HI
Power Supply
Input
Output
LO
HI
DCV
Ch1
LO
HI
ACV
Ch2
LO
HI
Ch3
CONT
LO
HI
TEMP
Ch4
LO
7700
Figure
Oscilloscope
7712-SMA-1
Cable
10%
90%
Load
Load
7705
7705
Ch21
Ch31
8. For the
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