Section
3
Operation
F~gure 3-1. Front Panel, Model 545A
FRONT PANEL CONTROLS AND INDICATORS
DISPLAY
The 12 digit
LED
display provides a direct numerical readout of a measurement or of an input
frequency. The frequency readout is displayed in a fixed position format that
is
sectionalized
in
GHz, MHz, kHz and Hz. Power information
is displayed in
dBm to 0.1 dB resolution, on the three
right-most digits. When both power and frequency are displayed, frequency resolution
is
limited to
100 kHz.
POWER switch turns counter on.
SAMPLE RATE/HOLD varies time between measurements from 0.1 to 10 seconds (nominal).
(Gate time
is
added to sample time, thus the minimum reading for
1
Hz resolution is
1.1
seconds.)
The last reading
is
retained indefinitely in HOLD.
GATE lights when the signal gate
is
open and a measurement
is
being made.
a
SEARCH lights when the counter
is
not locked to an input signal.
RESET
manually over-rides all controls, resets the counter and converter, and initiates a new reading.
Scans by ArtekMedia © 2007
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