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View a spectrum showing absolute field strength: Press MODE three times.
Change the spectrum span (sweep width): Press MENU, go to Spectrum kHz: 128 45, follow on-
screen help.
Go to the field strength screen from a spectrum screen: Repeat presses of MODE until the field
strength screen appears.
Measure a harmonic in dB below the carrier (dBc): Set the desired carrier frequency, position the
4100 for a field strength reading between 300mV/m and 3 V/m (110 - 130 dBuV/m), press MENU, go to
Harmonic: 1 2 3 4 5, follow on-screen help to choose a harmonic and return to the field strength screen.
Measure RF voltage: Press MENU, go to Input: LoopAnt RF in. Press the right arrow key to change to
RF in and press MENU. Connect the source to the rear RF In connector (Input R = 2500 Ohms, Vmax = 40
Vrms). To return to field strength reading press MENU, go to Input, press the left arrow key to change to
LoopAnt, press MENU.
Display local time correctly: Press MENU, go to UTC Offset, enter the difference between UTC and
local time (for US EST, enter -05h00m).
Use the loop antenna to drive a spectrum analyzer: Connect the RF Out connector to the spectrum
analyzer input. The level for a 1 V/m (120 dBuV/m) field is 28 mVrms (89 dBuV) in 50 Ω ±0.5 dB, 200 kHz
- 5 MHz. To obtain field strength from the analyzer display multiply by 35.5 or add 31 dB.
Check/Change the GPS datum: Press MENU, go to GPS Datum, follow on-screen help.
Set the time of non-use for automatic turnoff: Press MENU, go to Auto off:, follow on-screen help.
Check the need for battery charging: Read the battery voltage on the display at the upper right. Less
than 7.0V indicates less than one hour of operation remaining. The 4100 turns itself off at 6.0V.
Charge the battery: Connect the charging supply output cord to the 4100's charging connector (rear,
upper right, middle connector) and connect the line input power cord to the line. Or, connect the vehicle
charging cord to the 4100 and to the vehicle lighter socket. A full charge takes three hours, a partial charge is
OK, the 4100 can be on or off. Voltage required is 11-15V, negative ground, 1.3 A, 2.1 mm connector.
Replace the battery: Pull the battery door open (bottom of front panel) starting with the upper left corner.
Pull the battery pack out, disconnect it (press on the tab at the battery side of the connector), connect the
replacement pack, insert it with its cable to the right, and push the connector under the battery. Close the
door, pressing its side edges and then its top edge until it snaps in all around.
Download measurement data to a computer: Install and open the 4100 Data Downloader program
supplied. Connect a USB A to B cable with the B plug to the 4100 (rear, upper right, lower connector). The
4100 can be off; if it is on, it will go off when the cable is connected. Click the Download button specify a
.csv file name and destination, and click Save. All data records in the 4100 are then downloaded. Open the
.csv file in a spreadsheet program where selected items can go to a data sheet template. Downloader program
buttons indicate other tasks it can do.
Get a dc output voltage proportional to field strength in dBuV/m: Connect to the RF In BNC
connector. The open-circuit (no load) output level is 1.0 V at 100 dBuV/m.
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