PZ4000 - External Sensor Input Impedance

The external sensor input (BNC) on the back of Yokogawa power analyzer input modules are used for a voltage output type of CT. While most of these analyzers have a high enough impedance to support these types of clamps, the PZ4000 standard input modules have a 10k ohm external sensor input. If someone requires the use of voltage output type of CT with a PZ4000, pay close attention to what type of clamp you require or are already using.

A special version of both PZ4000 input modules is available which provides a 1M ohm impedance. The modules are identified with a /Z at the end of the input module part number. A few examples of clamps that would require the 1M ohm impedance would be:

• 960-01
• SR651
• SR661
• SR751
• MR461
• MR561
• SL261