Bird Technologies APM-16 - Manual (Page 34)

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Calibration
Calibration of the Bird APM-16 will be required after replacing the meter or the
instrumentation module, and also when the calibration certification expires.
Note: Calibrating the unit, or disturbing the calibration label, within
the one-year warranty period will void the warranty.
Calibration Environment
For best results, make sure that the workspace meets the following requirements:

The workspace should be free from electrical noise and radiated sig-
nals. A Bird 43 equipped with a 4030 relative field strength element
can be used to check the area for spurious radiation. Make sure the
gain on the 4030 is set to maximum. If there is any meter deflection on
the 43, the area is unsuitable for calibration.

The workspace and equipment should be at a uniform and stabilized
temperature, between 20 and 25°C (68 to 77°F).

The relative humidity should be less than 50% and noncondensing.
Equipment Required
To calibrate the Bird APM-16, you will need the following equipment:

Standard digital multimeter with DC voltmeter resolution of 0.01 V or
better (Fluke Model 87)

Bird 4401A200 plug-in calibration element

Regulated DC power supply, supplying 2 ± 0.1 V

50 ohm coaxial cables (RG-58-U), no more than 3 feet (1 m) long

BNC “T” adapter
Figure 11 Calibration Setup