3.9 Using a Current Sensor
106
Setting external current sensor input
This section describes how to set the type of current sensor being used, the instrument’s CT ratio, and the
measurement range. These settings can be configured separately for each wiring mode.
See: "3.2.2 Selecting the Current Input Method" (p.42)
"3.2.9 Setting the VT and CT Ratio" (p.59)
The instrument cannot automatically detect or set the current sensor type or CT ratio. When
using a current sensor, you must manually set the current sensor type and CT ratio. If you
replace the sensor with another unit that has a different rating, you must reconfigure the cur-
rent sensor type and the instrument’s CT ratio.
• When the current sensor type is set to “Off,” input from the current direct input terminals is enabled, and
external current sensor input is ignored.
• The panel displays the current measurement ranges when using external current sensor input as 10 A, 20
A, and 50 A. When the auto-range setting is enabled, auto-range operation will use the 10 A, 20 A, and 50
A ranges.
• When using the 9660 Clamp on Sensor, only the 100 A range (shown as the 10 A range on the instru-
ment’s panel) can be used.
• When using a wiring mode other than 1P2W that combines multiple channels, the combined channels will
be forced to use the same current sensor type, CT ratio, and range. At this time, other channel settings will
be changed to reflect the settings in use by the channel with the smallest value.
Current sensor types and instrument CT ratio settings
Current sensor Current sensor rating TYPE CT ratio
9661 Clamp on Sensor 500 A AC 1 10
9669 Clamp on Sensor 1000 A AC 1 20
9660 Clamp on Sensor 100 A AC 1 10
CT9667 Flexible Clamp on Sensor 500A /5000A 1 10/100
CT6862 AC/DC Current Sensor 50 A AC/DC 2 1 (OFF)
CT6863 AC/DC Current Sensor 200 A AC/DC 2 4
CT6865 AC/DC Current Sensor 1000 A AC/DC 2 20
9709 AC/DC Current Sensor 500 A AC/DC 2 10
9277 Universal Clamp on CT 20 A AC/DC 2 0.4
9278 Universal Clamp on CT 200 A AC/DC 2 4
9279 Universal Clamp on CT 500 A AC/DC 2 10
9272-10 Clamp on Sensor 20 A/200 A AC 2 0.4/4
When the measurement target’s current exceeds the optional current
sensor’s rating
Use an external CT.
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