ESCO Technologies ETS Lindgren 3301B, User Manual

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Setup and Use | 27
8.0 Setup and Use
The Model 3301B is designed for ease of use, and is designed for five accurate
reading types in a variety of test environments. However, precision
measurements require an understanding of the test parameters that will
adversely affect test results. No single test instrument can insure accurate
results. For best results, the user should become thoroughly familiar with both
the practical and theoretical operating parameters for this unit.
8.1 Setup
Before beginning the setup procedure, make sure that the technician is
completely grounded using an ESD wrist strap at an ESD protective workstation
for protection of the antenna FET. Make sure antenna power is off.
The Model 3301B is quite sensitive to test setup and proper use. Two grounding
strips are provided on top of the unit. These are intended to attach to a
counterpoise, which is provided with the unit
To assemble the unit, first touch the two metal counterpoise mounting strips
located on top of the antenna chassis, then remove the two screws from each
strip. The unit is meant to be under the counterpoise. In this way the body of the
unit does not intrude into the field being measured. Open the counterpoise and
attach it to the mounting strips using the screws that were just removed. Next,
the rod should be attached to the fitting at the center of the unit, through the hole
in the counterpoise. The rod should then be extended to 41”. The output of the
unit should be connected to a 50-ohm receiver, spectrum analyzer, or RF
voltmeter. The technician should remove the ESD wrist strap at this time.
The unit is activated by pressing in the power switch on the front panel. The
switch will turn to green and the battery low/power indicator light will come on.
Should the indicator light not come on, the level of the battery charge should be
checked. Finally, the state of the gain switch should be checked. It is anticipated
that in most applications the low gain setting will be used.
The unit housing hangs under the counterpoise with the antenna rod passing
through an opening in the counterpoise.
It should be noted that the brass tripod mounting bracket on the bottom of the
unit is not a ground location. The unit must be attached to a counterpoise through
the top grounding strips. In screen room testing, the counterpoise should be
solidly attached to the screen room wall, as required for military testing.
If the unit is to be mounted on a tripod, it is recommended that the tripod be
non-conductive.