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Making
a
Measurement
CAUTION
Do not exceed the maximum input power.
The maximum input power for the HP
8591C
is +72
dBmV
(O-2
watt)
continuous, 100 V dc (with 10
dB
or more attenuation).
Let’s begin using the cable TV analyzer by measuring an input signal. Since
the 300 MHz calibration signal (CAL OUT) is readily available, we will use it
as our input signal.
You cannot hurt the cable TV analyzer by using the calibration signal and
pressing any of the keys described in this section. Don’t be afraid to play
with the knob, step keys, or number/units keypad. (If you have experimented
with other keys and wish to return to a known state, press the green
@KKK]
key.
>
1. First, turn the instrument on by pressing
m).
Wait for the power-up
process to complete.
2. Press the green
@ZZi)
key.
3. Connect the cable TV analyzer CAL OUT to the INPUT 75 0 with an
appropriate cable.
4. Set the frequency.
Press the [FREQUENCY] key. CENTER appears on the left side of the screen,
indicating that the center-frequency function is active. The CENTER FREQ
softkey label appears in inverse video to indicate that center frequency
is the active function. The active function block is the space on the
screen within the graticule where the center frequency messages appear.
Functions appearing in this block are active: their values can be changed
with the knob, step keys, or number/units keypad. Set the center
frequency to 300 MHz with the DATA keys by pressing 300
IFvlHz).
The
knob and step keys can also be used to set the center frequency.
5. Set the span.
Press (SPAN). SPAN is now displayed in the active function block, and the
SPAN softkey label appears in inverse video to indicate it is the active
function. Reduce the span to 20 MHz by using the knob, pressing the
down key
((7’J)),
or pressing 20
LMHzJ.
6. Set the amplitude.
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