3.8 Using a Current Sensor
104
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.
See: "3.2.1 Selecting the Current Input Method" (p.38)
"3.2.8 Setting the VT Ratio and CT Ratio" (p.58)
"3.2.3 Selecting the Voltage and Current Ranges" (p.43)
The instrument cannot automatically detect or set the current sensor type or CT ratio. When
using a current sensor, you must 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 current sensor
type and CT ratio.
• When the current sensor type is set to “Off,” input from the current 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 1 A, 2 A,
and 5 A. When the auto-range setting is enabled, auto-range operation is performed among the 1 A, 2 A,
and 5 A ranges noted on the panel.
• When using the 9660 Clamp on Sensor, use the 100 A range (shown as the 1 A range on the instrument’s
panel).
Current sensor types and instrument CT ratio settings
Current sensor Current sensor rating TYPE CT ratio
Model 9661 Clamp on Sensor 500 A AC 1 100
Model 9669 Clamp on Sensor 1000 A AC 1 200
Model 9660 Clamp on Sensor 100 A AC 1 100
Model CT9667 Flexible Clamp on Sensor 500 A / 5000 A AC 1 100/ 1000
Model CT6862 AC/DC Current Sensor 50 A AC/DC 2 10
Model CT6863 AC/DC Current Sensor 200 A AC/DC 2 40
Model CT6865 AC/DC Current Sensor 1000 A AC/DC 2 200
Model 9709 AC/DC Current Sensor 500 A AC/DC 2 100
Model 9277 Universal Clamp on CT 20 A AC/DC 2 4
Model 9278 Universal Clamp on CT 200 A AC/DC 2 40
Model 9279 Universal Clamp on CT 500 A AC/DC 2 100
Model 9272-10 Clamp on Sensor 20 A/ 200 A AC 2 4/ 40
Model CT6841 AC/DC
Current Probe 20 A AC/DC 2 4
Model CT6843 AC/DC
Current Probe 200 A AC/DC 2 40
When the measurement target’s current exceeds the optional current sensor’s rating
Use an external CT.
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