External Voltage Connections - Fluke 52120A-C User Manual

52120A
Operators Manual

External Voltage Connections

The Product output is isolated from ground so measurements can be made on external
circuits energized to a maximum of 600 V rms. If the Product is to be connected to
external hazardous voltage, it is recommended you use the connection and disconnection
sequence in the Product Connection Cables section in Chapter 1.
To prevent damage to the Product, do not connect the HI and
LO terminals to external voltages at the same time.
Only connect the output HI terminal or LO terminal to an external voltage. As the voltage
between the HI and LO can be no more than 4.5 volts in normal operation, the HI and LO
inputs will be very near the voltage of the external circuit.
When you connect an external voltage to the current output terminals, you cannot connect
the output current low connector to ground for common-mode protection.
To prevent damage to the Product, do not connect the LO
terminal to a terminal that can be at earth potential when an
external voltage is connected to the current terminals.
The configuration of the connected equipment can limit the measures you can use to
decrease common-mode current errors when external voltage is applied to the current
circuit. The best measure is to use equipment that has good common-mode current
immunity.
The calibration or type test of single-phase or multi-phase watthour meters is one
example where common mode voltage can be applied to the output terminals. Figure 2-2
shows a typical connection of the Product to a watthour meter where a 6105A supplies
the voltage and the Product the current.
2-6
W Caution
W Caution