User Manual

2.2 Connecting the Cables
21
For voltage measurement, be sure to read "2.2.1 Connection Preparations" (⇒ p. 16) before
connecting.
For current measurement, read also "2.3 Connecting Clamps" (⇒ p. 29).
When measuring current
See below for the standards defining the underlined terms.
IEC61010-1 (JIS C1010-1)
IEC61010-2-031 (JIS C1010-2-31)
IEC61010-2-032 (JIS C1010-2-32)
For information about other clamps, see "2.3 Connecting Clamps" (⇒ p. 29).
2.2.5 Connecting to the Model 8940 F/V Unit
Input module
Model 8940 F/V Unit
Maximum Input Voltage (⇒ p. 4)
Frequency, Pulse Totalization and Duty, and Voltage
Measurement:
Any of the following connects to a BNC jack on an input
module.
Current Measurement:
Connect to the BNC and sensor jacks on the input mod-
ule.
(The connection procedure depends on the clamp being
used.)
• Model 9197 Connection Cord
Maximum input voltage:
500 V (large alligator clips)
• Model 9198 Connection Cord
Maximum input voltage:
300 V (small alligator clips)
• Model 9217 Connection Cord
Maximum input voltage:
300 V (for BNC output)
If the voltage to be measured exceeds the maximum input
rating of the input module being used:
• Model 9322 Differential Probe*
1
(⇒ p. 31)
• Model 3273 or 3273-50*
5
Clamp-On Probe*
2
• Model 3274, 3275, or 3276 Clamp-On Probe*
3
• Model 9270, 9271, or 9272 Clamp-On Sensor*
4
• Model 9277, 9278, or 9279 Universal Clamp-On CT*
4
*1. The optional Model 9325 Power Cord ,
Model 9418-15 AC Adapter, or Model
9248 Power Cord (when using the
Model 9687) is required for connec-
tion. (⇒ p. 32)
The following items are required to
connect a clamp.
*2. Any of the following models:
9319 Conversion Cable, the 3272 or
3269 Power Supply, or Model 9248
Power Cord (when using the Model
9687)
*3. The Model 3272 or 3269 Power Supply
or Model 9248 Power Cord (when us-
ing the Model 9687)
*4. The Model 9318 Conversion Cable or
the Model 9555 Sensor Unit
*5. When the Models 8940 and 3273-50
are used together, the input rating of
the 3273-50 is 15 Arms.
• Connect the clamp using the Model 9318 or 9319 Conversion Cable
The grounds of this instrument and the clamp are not isolated. Pay care-
ful attention to the connections to avoid damage to the equipment and
serious injury.
• When using the Model 3273 or 3273-50 Clamp-On Probe
To avoid short circuits and serious injury when opening the sensor jaws
to measure, if the voltage on the conductor to be measured may exceed
safe voltage
up to 300 V, the conductor should be well-insulated (with
1400 V AC withstand voltage), comply with overvoltage category I
, pollu-
tion level 2 and have double (strength) insulation rated for 300 V opera-
tion. To maintain safety, do not clamp over bare conductors. The core
and shield cover are not insulated.
• To avoid electric shock when using a clamp, be careful not to damage the
insulation on conductors being measured.