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must be at a low voltage reference potential. The low voltage reference does not
need to be physically earth grounded but should not carry any large voltage potential.
The 220 - 240V US style line power IS NOT suitable to connect to the DUT inputs.
This style of power distribution is a balanced type with two HOT or LINE conductors.
Be sure that the hot lead of the power source is connected to pin
1, L (line) terminal of the DUT input connector and the return or
low voltage lead is connected to pin 2, N (neutral) terminal of the
DUT input connector. DO NOT connect a line conductor to the N or Neutral terminal
of the DUT inputs. This condition can be very dangerous to the OMNIA user.
If voltage is applied to pin 2, N (neutral) terminal of the DUT input and you attempt to
execute a Run Test or Leakage Current test, a warning message will appear in the
displayed messages portion of the screen that says Neutral-V. If you see this
message, you will need to correct the voltage problem before the instrument will allow
you to execute Run Tests or Leakage Current tests.
5.1.5. Scanner Connections
The Scanner provides 8 High Voltage channels and 8 Ground
Bond channels on the rear panel. The High Voltage channels
can be set to a High or Low level giving 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. The Ground Bond channels can test
only from one channel to the common Return and only one channel may be used for
each test.
Instructions for setting the Scanner channels are in the section 4.4. Test Parameters
of this manual.
The Scanner will provide output to multiple test points and will have the same
operation specifications that apply to the standard instrument with the exception of
one Ground Bond channel limitation. Due to the characteristics of general-purpose
High Current relays, some additional contact resistance cannot be prevented.
Although this contact resistance can be offset using the milliohm offset feature of the
instrument, there will be some variation of the contact resistance because the relay
must open and close. Each relay closure may represent a different resistance value.
The Ground Bond channels will have the following characteristics:
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