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capacitance, load and short inductances, load impedance,
and reflection standard offset lengths.
Reference Impedance: Modify the reference impedance
of the measurement to other than 50 ohms (but not 0).
LRL/LRM Calibration Capability:
The LRL calibration
technique uses the characteristic impedance of a length of
transmission line as the calibration standard. A full LRL cal
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ibration consists merely of two transmission line measure
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ments, a high reflection measurement, and an isolation
measurement. The LRM calibration technique is a variation
of the LRL technique that utilizes a precision termination
rather that a second length of transmission line. A third op
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tional standard, either Line or Match, may be measured in
order to extend the frequency range of the calibration. This
extended calibration is achieved by mathematically concat
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enating either two LRL, two LRM, or one LRL and one
LRM calibration(s). Using these techniques, full 12-term er
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ror correction can be performed on the 373XXA VNA.
Adapter Removal Calibration: Built-in Adapter Removal
application software accurately characterizes and “re-
moves” any adapter used during calibration what will not
be used for subsequent device measurements. This tech-
nique allows for accurate measurement of non-insertable
devices.
Dispersion Compensation: Selectable as Coaxial
(non-dispersive), Waveguide, or Microstrip (dispersive).
Reference Plane: Selectable as Middle of line 1 or Ends
of line 1.
Corrected Impedance: Determined by Calibration Stan-
dards.
HARD COPY
Printer: Menu selects full screen, graphical, tabular
data, S2P or Text output, and printer type. The number of
data points of tabular data can be selected as well as data
at markers only. Compatible with the 2225C InkJet, HP
QuietJet, HP 310/320/340 DeskJet, HP 500 Deskjet, HP
560C DeskJet (b/w only), HP LaserJet II, III, & IV Series,
and some Epson compatible printers with Parallel (Centr
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onics) interfaces.
GPIB Plotters: The 37XXX VNA is compatible with HP
Models 7440A, 7470A, 7475A, and 7550A (in standard
mode) and Tektronix Model HC100 plotters. Menu selects
plotting of full or user-selected portions of graphical data.
Plotter is connected to the dedicated GPIB bus.
Performance: After selecting the Start Print button, front
panel operation and measurement capability is restored to
the user within 2 seconds.
STORAGE
Internal Memory: Ten front panel states (setup/calibra
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tion) can be stored and recalled from non-volatile memory
locations. The current front panel setup is automatically
stored in non-volatile memory at instrument power-down.
When power is applied, the instrument returns to its last
front panel setup.
Internal Hard Disk Drive: Used to store and recall mea
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surement and calibration data and front-panel setups. All
files are MS-DOS compatable. File names can be 1 to 8
characters long, and must begin with a character, not a
number. Extensions are automatically assigned.
External SCSI Interface: Option 4 deletes the internal
hard disk drive, and adds a SCSI Interface connector to
the rear panel for connecting a SCSI-2 formatted hard disk
drive.
Internal Floppy Disk Drive: A 3.5-inch diskette drive
with 1.44 Mbytes formatted capacity is used to load mea
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surement programs and to store and recall measurement
and calibration data and front panel setups. All files are
MS-DOS compatable. File names can be 1 to 8 charac
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ters long, and must begin with a character, not a number.
Extensions are automatically assigned.
Measurement Data: 102.8 kbytes per 1601 point
S-parameter data file.
Calibration Data: 187.3 kbytes per 1601 point
S-parameter data file (12-term cal plus setup).
Trace Memory File: 12.8 kbytes per 1601 point channel.
GPIB
GPIB INTERFACES - 2 PORTS
System GPIB (IEEE-488.2): Connects to an external
controller for use in remote programming of the network
analyzer. Address can be set from the front panel and can
range from 1 to 30.
Interface Function Codes: SH1, AH1, T6, TE0, L4,
LE0, SR1, RL1, PP1, DT1, DC0, C0.
Dedicated GPIB: Connects to external peripherals for
network analyzer controlled operations (e.g. GPIB plotters,
frequency counters, frequency synthesizers, and power
meters).
GPIB Data Transfer Formats:
ASCII, 32-bit floating
point, or 64-bit floating point. 32-bit and 64-bit floating point
data can be transferred with LSB or MSB first.
GPIB DATA COLLECTION SUMMARY
This section summarizes typical data collection times for
automated measurements using the 37XXX IEEE 488.2
GPIB bus. Throughput measurements for both tables were
made as follows: start the timer, trigger a sweep, wait for a
full sweep, transfer data across the GPIB and stop the
timer. Data throughput times are shown separately for
measurements made without calibration and with full
two-port, 12-term calibration.
Data Transfer Speed (with or without cal): 150 kbytes/
second
Measurement conditions: 40 MHz to 20 GHz sweep,
single channel, log magnitude display, 10 kHz IF band
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width, and output final data.
D-8 373XXA MM
PERFORMANCE SPECIFICATIONS APPENDIX D