Getting Started
2715 User Manual
2–15
5. Press [
b
] to the right of [REF LEVEL] three times to reduce the reference
level 30 dB.
For numeric entry, the W key terminates any channel number; whereas, the X, Y,
or Z keys terminate channel/frequency entry. On channel/frequency, the 2715
selects the channel closest to the new channel/frequency.
Figure 2–5 shows what the resulting display should look like, although some of
the signal peaks on your spectrum analyzer may have slightly different ampli-
tudes than those shown. Notice that both the reference level and RF attenuation
readouts have decreased 30 dB (the reference level is 38.8 dBmV and the RF
attenuation is 20 dB).
Normally the arrow keys change the reference level 10 dB per press, but in FINE
mode the value changes 1 dB per press. Another method is to set the reference
level to 20.8 dBmV, less than half a division above the expected signal ampli-
tude. We choose this value for the following reasons:
H
Signal amplitudes are read out and displayed most accurately when they are
near the reference level.
H
2 dB provides a small amount of “headroom” in case the signal should be
slightly larger than anticipated.
ATTN 20DB
VF WIDE
10 DB/
18.8 dBmV
Fundamental
Harmonics
2nd
4th
10th
900.0MHZ
38.8DBMV
180MHZ/MAX
5MHZ RBW
3rd
CALIBRATOR
FREQ
Figure 2–5: Calibrator Signal and Harmonics
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