3.9 Using a Current Sensor
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An optional current sensor can be used to measure currents in excess of the instrument’s current effective
measurement range maximum of 65 A. By setting the instrument’s CT ratio based on the rating of the current
sensor being used, you can read the measured current value directly.
The instrument can use the current sensors listed below. For detailed specifications for current sensors or the
9555-10 Sensor Unit as well as information about how to use the sensors, see the included instruction man-
ual.
The following current sensors are referred to as “TYPE1” current sensors:
• Model 9661 Clamp on Sensor (rated current: 500 A AC)
• Model 9669 Clamp on Sensor (rated current: 1000 A AC)
• Model 9660 Clamp on Sensor (rated current: 100 A AC)
• Model CT9667 Flexible Clamp on Sensor (rated current: 500 A/5000 A AC)
The following current sensors are referred to as “TYPE2” current sensors:
• Model CT6862 AC/DC Current Sensor (rated current: 50 A AC/DC)
• Model CT6863 AC/DC Current Sensor (rated current: 200 A AC/DC)
• Model 9709 AC/DC Current Sensor (rated current: 500 A AC/DC)
• Model CT6865 AC/DC Current Sensor (rated current: 1000 A AC/DC)
• Model 9277 Universal Clamp on CT (rated current: 20 A AC/DC)
• Model 9278 Universal Clamp on CT (rated current: 200 A AC/DC)
• Model 9279 Universal Clamp on CT (rated current: 500 A)
• Model 9272-10 Clamp on Sensor (rated current: 20 A/200 A AC range switchable)
3.9 Using a Current Sensor
The external current sensor input terminals are not isolated (secondary potential).
Never connect any input other than isolated input from an optional current sensor to
the terminals. Doing so may result in a short-circuit accident or electric shock.
Current sensors (TYPE1) that are connected directly to the instrument’s external
current sensor input terminals (current sensor terminals)
Current sensors (TYPE2) that are connected to the instrument’s external current
sensor input terminals (current sensor terminals) using the 9555-10 Sensor Unit
and L9217 Connection Cord
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