33
Verification test, equipment required:
Signal Generator:
Frequency: 520 kHz or lower to 5100 kHz or higher, settable in steps of 1 kHz or less
(steps of 10 Hz or less required for bandwidth measurement), accuracy ± [5 x 10e-6].
Output level: maximum, at least 700 mV rms with a 50Ω load, settable in steps of 0.1
dB or less; harmonic level, less than -40 dBc desirable.
Digital DC Voltmeter:
Range: 3-1/2 digits minimum, accuracy ±0.1% or better and resolution 1 mV or better
at 500 – 750 mV input.
Input resistance: 10 Megohms minimum.
Verification test procedure:
1. Setup:
Perform this test in a location as free as possible from high RF fields from nearby transmitters.
Place the 4100 on a non-metal bench top with no metal objects of similar or larger size less than 12 inches
from the 4100 (to avoid affecting the loop antenna). On a metal bench the 4100 can be placed on a non-
metal support such as a cardboard box at least 12 inches above the bench.
2. Connections:
Connect the Signal Generator output to the 4100 CAL in jack using a 50 Ohm coaxial cable with
BNC connectors. No external terminating resistor is required, the jack input resistance is 50 Ohms.
Connect the 4100 RF out jack to the digital voltmeter test probes using a BNC-to-clip cable,
with the ground clip to the voltmeter low probe and the center-conductor clip to the high probe.
3. Test data sheet:
Prepare a test data sheet showing the following: full identification of the PI4100 under test; the
location, date, and time of the test, the test equipment used, and the person performing the test; columns
for recording frequency, final generator level setting, 4100 dc detector (RF Out) voltmeter mV reading,
4100 field strength mV/m reading, a corrected value of this reading (if needed, see 5a below), previous
field strength reading from the calibration certificate, the calculated ratio of these two field strength
values, and any other appropriate data and notes.
Supplied Data Sheet: A Calibration Data Sheet is included on the CD-ROM supplied with the
PI 4100. It is a Microsoft Excel file, PI4100FieldCalCheckDataSheet2.xls, for downloading to a user’s
Windows computer. To use it, for each frequency enter the following: in Column B, the factory
indicated field strength for the unit from the supplied calibration certificate; in Column C, the measured
detector dc millivolts; and in Column D, the indicated field strength. Columns E and F will then be
automatically calculated. Or, the sheet may be printed and filled in by hand.
4. Tests:
Perform the following procedure at each desired test frequency. For an overall performance test
use the applicable test frequencies shown on the calibration certificate: 200, 250, 320, 410, 520, 670, 860,
1100, 1400, 1800, 2400, 3100, 4000, & 5100 kHz.
4a. Turn on the signal generator and set it to the first desired frequency, 520 kHz for a 520 –
5100 kHz unit, and an output level of 117 dBuV or 700 mV, with no modulation. Then, wait for
whatever warmup time the generator requires for its output to stabilize. Its frequency must be within 50
Hz of the desired value.
To Next Page
Loading...
