Bird Technologies 8401 - Manual (Page 22)

Inspection
With the rugged and simple construction of the Load Re-
sistors, periodic inspection will be necessary at only about
six-month intervals. Inspection should include the items
listed below:
1. Oil Leakage - Check for coolant oil seepage
around the radiator tank, particularly at the
front and back around the underside of the
clamping band.
2. Inspect the Load for completeness and general
condition of the equipment.
The Troubleshooting Chart lists the symptoms of com-
monly encountered troubles, their causes, and suggested
corrective measures. Use this chart as a guide when ana-
lyzing symptoms.
Preventive
Maintenance
Because of the basic simplicity of construction, no special
maintenance procedures are required. Keep the equip-
ment clean, and occasionally check the coolant level in
the radiator tank.
DC Resistance
Check the condition of the load resistor by accurate meas-
urement of the dc resistance between the inner and outer
conductors of the RF connector. Use an ohmmeter with
an accuracy of 1 percent or better at 50 ohms for this
purpose. The measured resistance should be a nominal 50
ohms, ±2 ohms. Perform this test only when the load has
cooled down to room temperature. Refer to figure 1.
12
Bird Series 8400S Termaline Coaxial Load Resistor
50.0
Figure 1
DC
Resistance
Measurement