Atec Agilent-8753E - Manual (Page 11)

Measurement
Number of display channels
Two display channels available.
Measurement parameters
HP 8753E: S
11
, S
21
, S
12
, S
22
, A, B, R, A/R, B/R, A/B.
Conversion to impedance or admittance.
Formats
Cartesian:
log/linear magnitude, phase, group delay, SWR,
real and imaginary.
Smith chart:
with log/linear amplitude and phase,
R + jX, G + jB, or real/imaginary markers.
Polar:
with linear/log amplitude, phase, or real and imagi-
nary markers.
Data markers
Each display channel has five independent markers that
can be displayed simultaneously. Markers can indicate
data at actual data points or they can interpolate between
data points to allow the setting of a marker at an exact
frequency. Any one of the five markers can be the refer-
ence marker for delta marker operation. Markers can be
coupled or uncoupled between display channels. Ten
independent markers can be displayed simultaneously
on a single measurement in dual channel mode when
markers are uncoupled.
Marker functions
Markers can be used in various functions: Marker search
(Mkr to max, Mkr to min, Mkr to target), Mkr bandwidth
with user-defined target values, mkr
➞ start, mkr ➞ stop,
mkr
➞ center, mkr ➞ span, mkr ➞ reference, mkr ➞ delay,
and trace statistics (average value, standard deviation, and
peak-to-peak deviation of the data trace between two
markers). The tracking function enables continuous
update of marker search values on each sweep.
Group delay characteristics
Group delay is computed by measuring the phase change
within a specified frequency step (determined by the fre-
quency span, and the number of points per sweep).
Aperture: selectable
Maximum aperture: 20% of frequency span
Minimum aperture: (freq. span) / (number of points –1)
Range
The maximum delay is limited to measuring no
more than 180° of phase change within the minimum
aperture.
Range = 1 / (2 x minimum aperture)
Accuracy
The following graph shows group-delay accuracy at
1.3 GHz with type-N full two-port calibration and
10-Hz IF bandwidth. Insertion loss is assumed to be
< 2 dB and electrical length to be ten meters.
Source control
Sweep limits
Set start/stop or center/span of the stimulus parameter
(frequency, power, time) directly through the source con-
trol keys and the control knob, the step keys or the data
entry keyboard.
Sweep type
Set a linear or logarithmic sweep, an arbitrarily defined
frequency list, a power sweep or a CW (single frequency)
type of sweep.
Measured number of points per sweep
Linear frequency: choose 3, 11, 26, 51, 101, 201, 401, 801, or
1601 points.
Fast swept list
Define up to 30 different sub-sweep frequency ranges in
any combination of CW, CW-delta F, or start-stop sweep
modes. Set test-port power levels and IF bandwidth inde-
pendently for each segment.
Sweep modes
Set a coupled channel sweep (same stimulus conditions on
both channels) or an uncoupled channel sweep (alternate
sweep).
Chop/alternate
Select whether to alternately or simultaneously (chop)
measure channels when in dual-channel mode. Chop mode
is faster, while alternate mode optimizes dynamic range.
The analyzers default to chop mode.
11
HP 8753E supplemental characteristics