3.2 Configuring Settings
58
When inputting a voltage in excess of the instrument’s maximum input voltage of 1,000 V or a current in
excess of its maximum input current of 30 A, use an external VT (PT) or CT, respectively. This section
describes how to set the ratio (VT ratio or CT ratio) when using an external VT or CT. Even when using an
external current sensor, it is necessary to set the CT ratio.
By setting the VT ratio and CT ratio, you can read the measured current value (CT primary-side current)
directly.
VT ratio setting range
0.001 to 0.009, 0.010 to 0.099, 0.100 to 0.999, 1.000 to 9.999, 10.00 to 99.99, 100.0 to 999.9 (1,000)
(If the VT ratio is set to 0.0, 00.0, or 000.0, the instrument internally multiplies measured values by a VT ratio
of 1,000.
CT ratio setting range
0.001 to 0.009, 0.010 to 0.099, 0.100 to 0.999, 1.000 to 9.999, 10.00 to 99.99, 100.0 to 999.9 (1,000)
(If the CT ratio is set to 0.0, 00.0, or 000.0, the instrument internally multiplies measured values by a CT ratio
of 1,000.
3.2.8 Setting the VT Ratio and CT Ratio
When the VT and CT lamps are lit up (particularly when the VT ratio and CT ratio are
set to values less than 1), a voltage or current greater than the displayed measured
value may have been input to the instrument. To prevent an electrical accident or
short-circuit, do not unnecessarily touch the instrument’s input terminal or the mea-
surement lines.
This indicates that the VT or CT ratio cannot be changed.
After pressing to exit the setting, perform the following procedure:
Status Solution and reference for more information
During integration operation
(RUN lamp lit up or flashing)
The VT and CT ratios cannot be changed until the integrated value is reset
(so that the RUN lamp turns off).
See: "Canceling integration (resetting integrated values) (DATA RESET)" (p.65)
During display hold operation or
maximum value/minimum value
hold operation (HOLD, MIN, or
MAX lamp lit up)
The VT and CT ratios cannot be changed until this operation is canceled
(so that the HOLD lamp turns off).
See: "Canceling the display hold state" (p.106)
"Switching the display among the maximum, minimum, and instantaneous
values" (p.107)
If the VT ratio or CT ratio does not flash
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