HP 8756A Operation Manual

Operating Information
Model 8756A
3-6
2. CHANNEL. This area selects the measurement, display,
scale, and reference line functions of the 8756A. Each
channel has identical column of independent keys. The
function selection for each key is denoted by the
corresponding lamp (LED), located in the center of the
CHANNEL area, and is selected by repeated pressing of that
key. Selection of a function (except CHAN OFF) designates
that channel the Active Channel and is indicated by a
higher intensity MODE LABEL. Trace data is displayed for
that channel. Labels are also displayed, unless the soft
key function LABELS ON/OFF has selected labels OFF.
~
~
e A/R
e 8/R
e A/8
e A
• 8
e R
Selects MEASurement of detector signal
RATIOs A/R, B/R, or A/B. When A/R is
selected, the displayed data is the
measured value of A in dBm (decibel power
ratio compared to one milliwatt) minus the
measured value of R in dBm. Since the
values are in dBm, a logarithmic subtrac-
tion equals the linear division A/R. The
displayed units for the measurement are dB
(decibels) . Similar operation occurs for
B/R and A/B.
The shift function of this key shuts off
labels and data for the channel selected.
The channel is turned back on by selecting
any other function referring to that
channel.
Selects MEASurement of detector power A, B,
or R in dBm.
Figure 3-1. Front Panel Operating Features (4 of 11)

HP 8756A Specifications

General

Brand	HP
Model	8756A
Category	Measuring Instruments
Language	English