EEC SE 7430, User Manual, Page: 63 / 106

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Scanner or EX Scanner: (This parameter will only be seen on units equipped with a scanner). The
high voltage channels can be set to a High (H) or Low (L) level giving the operator the capability to
test from one channel to another channel or from any channel to a common Low or Return point.
The channels can be connected in parallel if desired but there is only one leakage current
measurement for all channels. This parameter allows for setup of multiple Scanner channels. The
three different selectable Scanner states are L (scanner channel set to the return point), H
(scanner set to the high voltage point) and O (OFF).
Range: It can through fixed range to reduce the test time.
Prompt: The Prompt function allows you to insert a short line of text in a step. The Prompt will
appear on the screen before the step is initiated and remains on the screen until the TEST button
is pressed. After the TEST button is pressed, the Prompt will clear and the step will initialize.
Defaults: Pressing this soft key will default the test parameters to their predetermined default
values. Once the default soft key is pressed it is necessary to complete the edit either by pressing
the ENTER key to accept the parameter overwrite or the EXIT key to escape from the edit and
return to the original values.
4.6.2 Additional Parameter Notes and Functions
Real Current
The AC Real Current function allows the user to monitor only the real portion of the leakage
current and ignore any reactive components due to capacitance in the device under test. It is
important to recognize that the total current is the vector sum of the reactive and real current, not
the direct addition of the two components. As in a right triangle, the total current is the square
root of the sum of the squares of the real and reactive currents.
Since the real component is usually much smaller than the reactive current, a doubling of the real
current increases the total current by only a small amount. Unless the two components are
separated, a doubling of the real leakage current can go virtually undetected by a total current
measurement.
Because Real Current is installed in SE, additional parameter selections are added to the ACW test
parameters. The additional test parameters are Max Lmt R (Real Current Maximum limit), Min Lmt
R(Real Current Minimum Limit) and Display. The standard total current limits have a “T” next to
them indicating total current.
The AC Real Current function allows the operator to view both real and total current
simultaneously. The Display parameter allows you to select which meter will display the real and
total current. When the display parameter is set for Total, the large current meter will display the
total current and the real current will be displayed in the small current meter below the memory
location name. The opposite is true when the display parameter is set for Real.