Agilent Technologies 4294A Uživatelský manuál stáhnout pdf (Strana 5)

5

The Agilent 4294A employs a state-

of-the-art auto-balancing-bridge

technique in a four-terminal-pair

(4TP) measurement configuration.

Meticu lous circuit design against

distortion and instability resulted

in a highly accurate and stable

measurement system for a wide

impedance range.

4294A Q accuracy (typical)

OSC level = 250 mV

For evaluating devices with wide

impedance range

A wide impedance range is required

to accurately measure both resonant

impedance and anti-resonant imped-

ance of crystal/ceramic resonators.

Crystal resonator impedance measurement

For evaluation of low-loss devices

With the trend toward lower power

consumption and compact equipment,

inductors and capacitors are becoming

smaller with lower loss. The efficiency

Low-loss capacitor ESR

(equivalent series resistance)

measurement (100 µF ceramic C)

The 4294A covering several decades

(m to hundreds of M) of impedance

can measure resonator characteristics

accurately.

SMD capacitor impedance measurement

(using the 42942A)

improvement in power conversion for

switching power supply applications is

an example. These applications require

low-loss induc-tors and capacitors.

High Q inductor measurement (low-loss)

The dynamic range of the 4294A in

terms of impedance is more than

200 dB. When compared to that of

a general network analyzer with a

direc-tional bridge, at 80 dB, it is

clear, the 4294A has an extremely

broad impedance-measurement range.

Impedance measurement range (typical)

State-of-the-art technology for improved measurement performance

1Ω

1 mΩ

Q ≥ 200

1G

100M

10M

1M

100K

10K

1K

100

10

1

100m

10m

1m

Impedance Ω

100 1k 10k 100k 1M 10M 110M

30%

10%

10%

30%

Frequency (Hz)

100%

90%

80%

70%

60%

50%

40%

30%

20%

10%

0%

100 1k 10k 100k 1M 10M 110M

Q=500

Q=300

Q=100

Q accuracy [%]

Frequency (Hz)

1 2 3 4 5 6 7 8 9 10 11 12

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