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other five. Markers can be directed automatically to the
minimum or maximum of a data trace.
Enhanced Markers: Marker search for a level or band
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width, displaying an active marker for each channel, and
discrete or continuous (interpolated) markers.
Marker Sweep: Sweeps upward in frequency between
any two markers. Recalibration is not required during the
marker sweep.
Limit Lines: Either single or segmented limit lines can
be displayed. Two limit lines are available for each trace.
Single Limit Readouts: Interpolation algorithm deter
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mines the exact intersection frequencies of test data and
limit lines.
Segmented Limit Lines: A total of 20 segments (10 up
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per and 10 lower) can be generated per data trace. Com
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plete segmented traces can be offset in both frequency
and amplitude.
Test Limits: Both single and segmented limits can be
used for PASS/FAIL testing. The active channel’s PASS or
FAIL status is indicated on CRT after each sweep. In addi
-
tion, PASS/FAIL status is output through the rear panel I/O
connector as selectable TTL levels (PASS=0V, FAIL=+5V,
or PASS=+5V, FAIL=0V).
Tune Mode: Tune Mode optimizes sweep speed in tun-
ing applications by updating forward S-parameters more
frequently than reverse ones. This mode allows the user to
select the ratio of forward sweeps to reverse sweeps after
a full 12-term calibration. The ratio of forward sweeps to
reverse sweeps can be set anywhere between 1:1 to
10,000:1.
DISPLAY CAPABILITIES
Display Channels: Four, each of which can display any
S-parameter or user defined parameter in any format with
up to two traces per channel for a maximum of eight traces
simultaneously. A single channel, two channels (1 and 3,
or 2 and 4), or all four channels can be displayed simulta
-
neously. Channels 1 and 3, or channels 2 and 4 can be
overlaid.
LCD: Color, 8.5-inch diagonal.
Trace Color: The color of display traces, memory, text,
markers and limit lines are all user definable.
Trace Overlay: Displays two data traces on the active
channel’s graticule simultaneously. The overlaid trace is
displayed in yellow and the primary trace is displayed in
red.
Trace Memory: A separate memory for each channel
can be used to store measurement data for later display or
subtraction, addition, multiplication or division with current
measurement data.
Scale Resolution (minimum):
Log Magnitude: 0.001 dB/div
Linear Magnitude: 1pU
Phase: 0.01
o
Group Delay: 0.001 ps
Time: 0.001 ms
Distance:
0.1 µm
SWR: 1pU
Power: 0.05 dB
Autoscale: Automatically sets Resolution and Offset to
fully display measurement data.
Reference Position: Can be set at any graticule line.
Annotation: Type of measurement, vertical and horizon
-
tal scale resolution, start/stop or center/span frequencies,
and reference position.
Blank Frequency Information: Blanking function re
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moves all references to displayed frequencies on the CRT.
Frequency blanking can only be restored through a system
reset or GPIB command.
MEASUREMENT ENHANCEMENT
Data Averaging: Averaging of 1 to 4096 averages can
be selected. Averaging can be toggled on/off with front
panel button. A front panel button turns data averaging
on/off, and a front panel LED indicates when averaging is
active.
Video IF Bandwidth: Front panel button selects four
levels of video IF bandwidth. MAXIMUM (10 kHz), NOR-
MAL (1 kHz), REDUCED (100 Hz) and MINIMUM (10 Hz).
Trace Smoothing: Functions similarly to Data Averaging
but computes an average over a percentage range of the
data trace. The percentage of trace to be smoothed can
be selected from 0 to 20% of trace. Front panel button
turns smoothing on/off, and front panel LED indicates
when smoothing is active.
SOURCE CONTROL
Frequency Resolution: 1 kHz (1 Hz standard on RF
units and optional on Microwave units - Option 10A)
Source Power Level: The source power (dBm) may be
set from the 373XXA front panel menu or via GPIB. Refer
to Level Control Range table on next page.
In addition, the port 1 power may be attenuated in 10 dB
steps, using the internal 70 dB (60 dB for 37397A) step at
-
tenuator. Similarly, high input signals into port 2, not ex
-
ceeding 1 watt, can be attenuated up to 40 dB, using the
internal port 2 step attenuator.
Power Accuracy: ±0.5 dB at 2 GHz at default power.
Power Meter Correction: The 373XXA offers a
user-selectable feature that corrects for test port power
variations and slope (on Port 1) using an external Hewle
-
tt-Packard 437B or Anritsu ML8403 power meter. Power
meter correction is available at a user-selectable power
level, if it is within the power adjustment range of the inter
-
nal source. Once the test port power has been flattened,
its level may be changed within the remaining power ad
-
justment range of the signal source.
Set-On Receiver Mode: The 373XXA can be configured
to measure the relative harmonic level of test devices with
Set-On Receiver Mode capability. The 373XXA’s unique
373XXA MM D-5
APPENDIX D PERFORMANCE SPECIFICATIONS