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4294A
Precision Impedance Analyzer
Impedance Measuring Instruments
4294A Precision Impedance Analyzer
The Agilent 4294A precision impedance analyzer is an integrated
solution for efficient impedance measurement and analysis of com-
ponents and circuits. The 4294A covers a broader test-frequency
range (40 Hz to 110 MHz) with Basic impedance accuracy: ±0.08%.
Excellent High Q/Low D accuracy enables analysis of low-loss compo-
nents. The wide signal-level ranges enable device evaluation under
actual operating conditions. The test signal level range is 5 mV to
1 V
rms
or 200 µ A to 20 mArms, and the DC bias range is 0 V to ±40 V
or 0 mA to ±100 mA. Advanced calibration and error compensation
functions eliminate measurement error factors when performing
measurements on in-fixture devices. The 4294A is a powerful tool
for design, qualification and quality control, and production testing
of electronic components. Circuit designers and developers can also
benefit from the performance/functionality offered.
Wide-Range Accurate Measurement
The 4294A enables impedance measurement using the auto-balancing
bridge technique over the frequency range 40 Hz to 110 MHz. The basic
impedance accuracy is ±0.08%, and the typical Q accuracy is ±3% @
Q = 100,
≤
10 MHz. This advantage permits accurate evaluations of
impedance characteristics for a wide variety of electronic devices as well
as electronic and non-electronic material within a wide frequency range.
Versatile Analysis
The 4294A graphically displays impedance measurement results.
This permits easy analysis of the resonant frequency and impedance
values of electronic components using the marker functions. The
marker functions offer a simple method to pinpoint the resonant
frequency of components, as well, these functions assist users in
many other observations. The combination of the accumulate mode
(to superimpose traces) and the list sweep functions permits obser-
vation of the change in a DUT’s characteristics due to a change in the
measurement condition. Versatile and high-speed automatic testing
is possible using the list sweep function in conjunction with the limit
line function. The list-sweep function provides the ability to enhance
test throughput by segmenting the sweep to include only necessary
measurement frequencies, while the limit-line function (for Go/
No-Go Testing) provides the ability to apply test limits within each
segment. These functions greatly support the quality and performance
required evaluating modern and improved electronic components,
equipment and materials.
Equivalent Circuit Analysis
The equivalent-circuit analysis function provides advanced model-
ing (three and four element models) based on circuit constant values
of five available circuit models. This function simulates the frequen-
cy characteristics of components by using derived circuit values or
user-specified values. Comparison of design values to measurement
values can assist with efficient component design.
Programming
Full programmability is provided using built-in Instrument (IBASIC).
Desired measurements and computations, including graphics
analysis, can be programmed simply by storing front-panel key-
stroke operations. The one-key execution function allows easy selec-
tion and execution of customized IBASIC programs. Several forms
of storage are built-in (10 Mbyte no-volatile memory, RAM disk or
Floppy Disk).
Good PC Connectivity
Features fit to the latest PC environment include LAN (Local Area
Network) capability, VGA monitor output, and the TIFF file format.
LAN capability permits simplified networking ability when collecting,
sharing and analyzing data. VGA monitor output improves produc-
tivity and reduces eyestrain. TIFF file format allows easy transfer of
graphics to a PC.
Abundance of Accessories
Various Four-terminal-pair test fixtures can be used with the
4294A. The 42941A impedance probe kit (1.5 m), which covers
40 Hz to 110 MHz, enables in-circuit impedance measurement of
electronic circuits or components. Grounded devices can also be
measured. The 42942A terminal adapter, which covers 40 Hz to
110 MHz, converts the 4-terminal-pair port configuration to a
7 mm test port. This adapter permits the use of familiar 7 mm test
fixtures. Again, grounded measurement is available.
• Accurate measurement over wide impedance range and
wide frequency range
• Basic impedance accuracy: ±0.08%
• 40 Hz to 110 MHz, 3 m
Ω
to 500 M
Ω
• Powerful impedance analysis function
• Ease of use and versatile PC connectivity
• 30% typical accuracy range: 3 m
Ω
(100 Hz to 110 MHz),
500 M
Ω
(100 Hz to 200 kHz)
4294A
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