User Manual

2.2 Connecting the Cables

Read the following carefully before making connections.

For voltage measurement

Using cables with BNC connectors

When using the Model 8958 16-Ch Scanner Unit together with other

input modules

2.2 Connecting the Cables

2.2.1 Connection Preparations

About maximum input ratings of input modules and cables

• The maximum input voltage is the lesser rating of either the input module

or the cable to be used. Do not measure if this voltage would be

exceeded, as damage the instrument or a serious accident may result.

Example: When connecting the Model 9197 Connection Cord (500 Vmax)

to the Model 8936 Analog Unit (400 Vmax), the maximum input voltage for

measurement is 400 V DC.

For details of maximum input voltages, refer to "1.1 Product Overview"

(⇒ p. 5)

and "Chapter 5 Specifications" (⇒ p. 83).

• When connecting clip-type test leads to live terminals, be very careful to

avoid accidentally shorting conductors together and causing a serious

accident.

• When measuring voltage in a power line, connection cables should only

be connected to the secondary side of a breaker, so the breaker can pre-

vent an accident if a short circuit occurs. Connections should never be

made to the primary side of a breaker, because unrestricted current flow

could cause a serious accident if a short circuit occurs.

• Do not permanently connect the device in an environment where voltage

surges exceeding the maximum input voltage may occur. Failure to

observe this precaution could result in damage to the device and per-

sonal injury.

• Do not use cables other than those specified by Hioki. The specified

cables include insulated BNC plugs to avoid electric shock. An uninsu-

lated BNC plug may cause electric shock or damage to the BNC jack.

• Do not connect a cable to the instrument while it is connected to the

object to be measured. Otherwise, an electric shock accident may occur.

Use only the specified connection cords. Using a non-specified cable may result

in incorrect measurements due to poor connection or other reasons.

When disconnecting the BNC connector, be sure to release the lock before pull-

ing off the connector. Forcibly pulling the connector without releasing the lock, or

pulling on the cable, can damage the connector.

Do not attempt to measure the same signal with the 8958 and another input

module at the same time. Channel switching noise from the 8958 may affect

the other input module.