Vectronics SWR-584B - Manual (Page 8)

SWR-584B Instruction Manual HF/VHF SWR Analyzer
8
Coax Loss, the second mode, is reached by pressing the “MODE” button once. The liquid crystal display
(LCD) indicates the test frequency and approximate loss of any 50 ohm coaxial cable, 50 ohm attenuator pad, or
50 ohm transformer or balun (for differential mode current only). In this mode, the 50 ohm device or cable under
test must not be connected or terminated by a load resistance at the far end. If the device under test is terminated,
measured loss will be higher than actual loss.
Capacitance in pF is the third mode. The LCD shows measurement frequency, capacitive reactance (Xc=) in
ohms, capacitance (C=) in picofarads or pF. The Impedance meter indicates reactance in ohms, and the SWR
meter displays SWR.
Inductance in uH is the fourth mode. The digital display indicates measurement frequency, capacitive reactance
(Xl=) in ohms, inductance (L=) in microhenries or
µ
H. The Impedance meter indicates reactance in ohms, the
SWR meter displays SWR.
Freq. Counter is the fifth and final function of the main mode. The BNC connector labeled FREQUENCY
COUNTER INPUT should connect to the RF sample you want to measure. The sensitivity of this port ranges
from 10 millivolts at 1.7 MHz to 100 millivolts at 180 MHz. The “GATE” button controls the gate time of the
frequency counter. Longer gate times are accompanied by additional digits in the display, increasing counter
resolution.
WARNING: NEVER APPLY MORE THAN TWO VOLTS OF PEAK VOLTAGE, OR ANY DC
VOLTAGE, TO THE FREQUENCY COUNTER BNC PORT.
3.4 Blinking “VOLTAGE LOW” display warning
If supply or battery operating voltage is less than eleven volts, a blinking “VOLTAGE LOW” warning is
displayed. Pressing the “MODE” button during a low voltage warning will disable the warning, and allow
operation with low supply voltage. Readings might not be reliable when operating with supply voltages of under
11 volts.
4.0 MAIN (OR OPENING) MODE
WARNING: NEVER APPLY RF OR ANY OTHER EXTERNAL VOLTAGES TO THE ANTENNA
PORT OF THIS UNIT. THIS UNIT USES ZERO BIAS DETECTOR DIODES