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PI 4100
Medium Wave Field Strength Meter
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INTRODUCTION
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, shielded
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.
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 has been depended
upon by the international engineering community, government regulators,
and broadcast licensees for more than a generation.
PI 4100 innovations include:
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116 dB dynamic range tuned RF voltmeter |
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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 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 current
field measurements. (This feature anticipates the future acceptance
of data e-filing by federal regulatory agencies.) |
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.
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| PI
4100 SPECIFICATIONS |
| Field
Strength Meter |
| Frequency Range |
520 kHz to 5.1 MHz |
| Field Strength Range |
30 µV/M to 20 V/M (29.5 dBuV/m)
to
146 dBuV/m) |
| Measurement Uncertainty |
3.0% referenced to NIST*, standard
field |
Selectivity
Measurement Bandwidth
Adjacent Channel Rejection
Image Rejection
Spurious Rejection |
4 kHz
>90 dB at ±9 kHz
>80 dB
>80 dB |
| Minimum Frequency Step |
1.0 kHz |
| Self generated 2nd &
3rd harmonics |
<-90 dBc (carrier F/S <10 V/M,
from 530 to
1700 kHz) |
| Residual F/S Reading -
No Antenna |
<30 µV/m - 10 V/m field |
Antenna Type
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Shielded, multiturn Loop (removeable)
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| RF
Voltmeter |
Electrical specifications
shown above
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RF signal is applied directly to BNC
input port |
Measurement Units
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µV; mV; V; dBu; dBm (referenced
to 50 ohms)
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| Spectrum
Display |
| Center Frequency Range |
520 kHz to 5.1 MHz |
| Frequency Span |
±63 kHz |
Resolution Bandwidth
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< 1 kHz
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| Data
Storage & Retrieval |
| Memory Type |
Flash |
| 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 (for bi-directional computer interface) |
| External RF Calibration
Jack |
BNC (provides for calibration by a
3rd party cal. lab.) |
| External RF Input Jack |
BNC (50 ohms) 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 1½V: C-Zn or Alkaline) |
| Battery Life |
5 Hrs. Minimum before Recharge (NiMH) |
| Battery Recharge Time |
3 to 4 Hours |
| Operating Temperature
Range °C(°F) |
Continuous Exposure -15° (5°)
to +55° (+130°) |
| Dimensions cm (inches) |
28.3 (11 1/8) H x 19.1 (7½)
W x 38.4 (15 1/8) D |
| 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
- BW Shape Factor (-6 to -75 dB): 2:1
- Harmonics Measured to 5.2 MHz
- Auto timed-interval data collection
- Antenna Orientation Compass
- Use as Hand-held or Tripod mount
- Calibration Traceable to: NIST *
- External 50 ohms Calibration Input Port
- 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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