Operating Basics
2715 User Manual
3–5
Selects the reference level for the immediate entry mode. REFL appears on the
screen at left center. Enter the desired reference level from the keypad; terminate
with [+dBx] or [–dBx] key.
Range: +68.8 to –21.2 dBmV (or equivalent in other units)
The arrow buttons increase
y
or decrease
b
the FREQUENCY, SPAN/DIV, and
REF LEVEL by a specified amount. They are always active in the spectral
display mode, even if the parameter is not selected for immediate entry.
CHAN Change (CATV mode): changes by one channel in the channel table,
skipping the SKIPPED channels
FREQUENCY change:
equivalent of 50 knob clicks or 1 major division
in the AUTO tuning increment mode, and by the
designated tuning increment in other modes
SPAN/DIV change:
in a 1–2–5 sequence from 1 kHz to 180
Ă
MHz
REF LEVEL change:
1 dB or 10 dB per step depending on REF LVL
STEP setting
Shortcuts, respectively, to the zero span and maximum span settings. The keys
are toggles; one press activates the setting, the second returns to the span used
prior to the first press.
ZERO SPAN:
no frequency sweep, horizontal axis calibrated
in time/div, and the display is a time domain
representation of the signal at the indicated
center, or start, frequency
MAX SPAN:
180 MHz/div (often used to view full input
range of 0–1.8 GHz)
Toggles the amount by which the REF LEVEL arrow keys change the reference
level between 1 dB and 10 dB per press. The adjacent FINE indicator is
illuminated when 1 dB is selected.
REF LEVEL
REF LEVEL [
y
Ă
] [
b
āĂ
]
Keys
ZERO and MAX Keys
REF LVL STEP
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Страница 25: ...Getting Started ...
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Страница 318: ...Appendix C System Messages C 16 2715 User Manual ...
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