DIGI-FIELD Field Strength Meter


Specifications

Frequency Response: DC to 12 GHz
Relative Sensitivity: 0.1% or .001 +1 digit
Gain: Antenna Dependent
(The length of the antenna determines the instrument sensitivity)
Input Impedence: 50 Ohm
Detectable Power Range:
injected signal
at 100MHz: at 500MHz:
-57 dBm to -11 dBm,
2 nano watts to 60 microwatts
-45.5 dBm to -8 dBm,
15 nano watts to 150 microwatts
Display: Large 3 digit LED
with internal low battery voltage indicator (7.2V or less)
Power: Standard 9V transistor battery
Size: 3"W x 4.2"H x 1.5"D (heavy duty plastic case)
Operating Temperature: 0 to 50 degrees C.
Disclosure document registered #316013, U.S. Patent Office


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General Information:
DIGI-FIELD is an unusual and unique FIELD STRENGTH METER with features for Commercial, Educational, Instructional, RF laboratories, Amateur Radio, Scientists, Technicians, Teachers and Home use.

Applications:
1. Excellent aid for any type of antenna development, experiment or adjustment.
2. Useful for making and observing radiation patterns of antennas.
3. Measures TV coax distribution loss in a building
4. Detects electronic instrumentation cross talk due to RFI (EMI)
5. Defines the difference between balanced and unbalanced transmission lines.
6. Measures microwave-oven leakage, TV and computer radiation. Helps define safety distance
7. Determines RF level in radio environment and concealed areas.
8. Sniffs 60 cycle noise from motors.
9. Will measure RF level in your equipment resulting from different grounding methods.
10. Demonstrates antenna polarization as an instructional instrument.
11. RF safety monitor for individuals working in RF field.
12. Can be used as a power meter for very low power.
13. Transmission Locator (T-Hunt)

Digi-Field meter Operation:
DIGI-FIELD is simple to operate. Just flip the power switch on and it is ready to use (make sure your battery has enough power and it's connected). The length of the telescopic antenna will determine the instrument sensitivity. Over range is indicated by the blinking of the three right hand digits, giving a display of "1 ..."

DIGI-FIELD is designed with an external antenna option, with an SO 239 connector, it can be immediately converted to BNC using an adaptor. For TV cable or TV antenna measurements, a cable with PL 259 to F is necessary.

NOTE: If the DIGI-FIELD is used indoors, you should be aware that a house is not an anechoic chamber and the instrument will detect and measure the reflections off walls giving sums and differences of the radiation.

On the side, there is a detector output jack for AM monitoring and other uses.

Calibration:
In most cases, the operator will be concerned with the higher or lower signal readings. The readings can be calibrated by the operator. Included are 15 typical calibration curves in dBm and a conversion from dBm to voltage and power. Following is a suggestion of one calibration method. Calibration curves can be made by varying and graphing the transmitter power of known levels, (0, 25, 50, 100 watts) vs. the DIGI-FIELD reading. By replacing the calibration antenna with the test antenna, the measurements will show it's calibrated results. Another method is to directly inject a signal of calibrated frequency and amplitude into the antenna input connector.


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