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PI 4100
Medium Wave Field
Strength Meter
INTRODUCTION
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The PI 4100 is Potomac's third generation of precision survey instrumentation
intended for the direct measurement of electromagnetic field strength
in the 520 kHz to 5.1 MHz frequency spectrum. This instrument combines
a laboratory quality radio frequency voltmeter, a calibrated, Balanced
Loop antenna, an internal GPS receiver, an internal calibration source,
and data acquisition hardware and software in a single rugged package
weighing less than 3 kg.
PDF Brochure |
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This device is equipped with an embedded microcontroller engine that
obtains measurement data from the various transducers within the instrument
and formats that data for display and, at the option of the use, stores
it to memory.
DESCRIPTION
The PI-4100 was designed to become
the successor to the industry standard FIM-
41 and to provide the accuracy and reliability
that the international engineering community,
government regulators, and broadcast
licensees have depended on for more
than a generation.
PI 4100 innovations include:
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127 dB dynamic range measuring
receiver |
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Digitally synthesized tuning in 1.0 kHz
increments |
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Spectrum Display to facilitate various
compliance measurements (Field
Strength, Harmonic level, and Spectrum
Occupancy) in a single instrument |
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Provisions for third party calibration,
using their own laboratory standards,
when it is impractical to return the
instrument to the manufacturer for
calibration |
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Data acquisition software and PC
interface to enable the collection,
analysis, and e-distribution of field
measurements. (This feature anticipates
the future acceptance of data e-filing
by federal regulatory agencies.) |
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Various I/O ports have been provided to enhance the versatility of
the instrument and to perform certain operational tasks such as battery
recharge and computer data exchange.
Published Field Reports
 "Potomac FIM-4100 Field Report", Radio Magazine
"PI 4100 Takes to the Field", Radio World
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| PI
4100 SPECIFICATIONS |
| Field
Strength Meter |
| Frequency Range |
520 kHz to 5.1 MHz, calibrated |
| Field Strength Range |
22 µV/M to 50 V/M (27 dBuV/m)
to
154 dBuV/m) |
| Measurement Uncertainty |
3.0% (±0.3 dB) referenced to NIST*, standard
field |
Selectivity
Measurement Bandwidth
Adjacent Channel Rejection
Image Rejection
Spurious Rejection |
1.0 kHz
>85 dB at ±9 kHz
>60 dB
>80 dB |
| Minimum Frequency Step |
1.0 kHz |
| Self generated 2nd &
3rd harmonics |
<-85 dBc (carrier F/S <10 V/M,
from 530 to
1700 kHz) |
Antenna Type
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Balanced, multiturn Loop (removeable)
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| RF
Voltmeter |
Electrical specifications
shown above
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RF Signal is applied directly to RF In BNC |
Measurement Units
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µV-mV-V; mV only; dBuV/m
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| Spectrum
Display |
| Center Frequency Range |
520 kHz to 5.1 MHz |
| Frequency Span |
±63 kHz, ±22 kHz |
Resolution Bandwidth
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1 kHz
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| Data
Storage & Retrieval |
| Measurement Points |
250 max. |
| Download Software |
PI Proprietary (Microsoft Excel®
format compatible) |
Download Format
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ASCII: Comma Delimited
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| I/O
Ports |
| Headphone Jack |
3.5 mm Stereo Audio Jack |
| Battery Charging Jack
(12-15 Vdc) |
2.1 mm Power Jack (Switchcraft 722A
or equiv.) |
| Data output / Control
Input Jack |
USB Type B (for bi-directional computer interface) |
| External RF Calibration
Jack |
BNC (provides for calibration by a
3rd party cal. lab.) |
| External RF Input Jack |
BNC (input impedance 1890 ohm +12pF) provides for antenna
signal injection |
| External RF Output Jack |
BNC (50 ohms) RF output is proportional
to Field Strength
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| General |
| Batteries (AA cells,
six required) |
Rechargeable; NiMH (supplied)
(can also use 1.5V: Alkaline or Lithium) |
| Battery Life |
5 Hrs. Minimum before Recharge (NiMH) |
| Battery Recharge Time |
3 to 4 Hours |
| Operating Temperature
Range °C(°F) |
-15°C to +50°C (+5°F to +130°F) |
| Dimensions cm (inches) |
38x18x28 cm (15x7x11 in.) |
| Weight kg (lbs.) |
2.5 (5.5) |
* Specifications subject to change
without notice.
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- Lightweight, Rugged & Portable
- Accurate & Versatile
- Self Calibrating & Easy to Operate
- Digital Tuning
- Digital Field Strength Display
- Digital Spectrum Display
- Digital Data Capture & Storage
- SBAS augmented GPS positioning
- E-Data Friendly Transport Software
- Useable, 200 kHz - 8500 kHz
- DRM Capable
- Harmonics Measured to 5.1 MHz
- Uncalibrated FS to 600 V/m
- Antenna Orientation Compass
- Use Hand-held or Tripod mount
- Calibration Traceable to: NIST *
- External 50 ohm Calibration Input Port
- RF Output for external Spectrum analyzer
- DC Output of dBuV/m
- Removeable Loop Antenna
- Shielded Modular Construction
- Built-in Quality and Reliability by: Potomac Instruments,
inc.
* US National Institute of Standards
and Technology |
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