Vanguard PCI-600 - Manual (Page 11)

REV 2 PCI-600 USER’S MANUAL
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2.1.4. External Current Input
The PCI-600's “EXT CURRENT” input is a 10 ampere AC current
meter. This built-in ampere meter allows the user to monitor an
AC current. This current input is isolated. A typical application
for this feature is to measure a Current Transformer (CT)
current ratio. The user can set the PCI-600 to output a current
through the CT primary input. The CT secondary output is
measured with the PCI-600 “EXT CURRENT” input. Both the PCI-
600 output current and the CT secondary current are displayed
on the LCD allowing the user to easily calculate the CT current
ratio. The External Current’s polarity with respect to the PCI-
600 drive current is indicated on the LCD by a “+” sign (in phase)
or a “-” sign (out of phase). Proper phasing is indicated when
the same colored PCI connectors are connected to
corresponding terminals on the CT as shown below:
2.1.5. LCD Contrast Control
To change the contrast level on the PCI-600's LCD screen, press
and hold the contrast
[→]
key next to the LCD screen. Release
the contrast [→] key when the desired contrast level has been
reached.