Model 730

LINE TUNER TESTING MADE EASY

The Model 730 Line Simulator provides an easy method for pre-tuning and troubleshooting line tuners by simulating coupling capacitor values and characteristic line impedance in a Power Line Carrier system.

Line Impedance

The resistors are used to simulate the characteristic (surge) impedance of the line at RF frequencies. Using a twelve position rotary switch, the Model 730 is impedance values ranging from 200 to 530 ohms representing values that are common impedance settings on most Line Tuner Impedance Matching Transformers. A 600 ohm impedance was designed into the final switch position to provide an audio tone circuit dummy load

Coupling Capacitance

Simulate the characteristics of almost any coupling capacitor (CCVT). Using a 10 position rotary switch, the Model 730 is capable of producing capacitive values ranging from .001 uf to .01 uf in steps of .001 uf. For greater accuracy, three toggle switches are also provided that can be used in conjunction with the rotary switch for 150 pf, 250 pf and 500 pf capacitive values.

Dummy Load

The 50 ohm 25 Watt non-inductive dummy load accessible via a standard BNC female connector provides the technician another tool for the alignment of the PLC system. This 50 Ohm Dummy Load is often used to set 1 Watt & and 10 Watt Power Line Carrier Transmitters. It can also be used to check BNC cable integrity by verifying zero % reflected power from one end to the other.

The output connections to the Model 730 are made using 3 binding posts arranged in a triangular fashion. Each post will accept a standard Banana to BNC adapter or standard banana leads from common voltmeters. Impedance and capacitive characteristics can be introduced into the circuit independently or simultaneously by simply switching the position of the output connection to the equipment under test.