1.3 Operating Principle
1
-
5
ZA57630
The impedance and phase angle at the measurement frequency are obtained with one
measurement. Impedance frequency characteristics like a Bode diagram can be obtained by
measuring the gain and phase angle while sweeping the measurement signal source
oscillator (OSC) and measurement frequency. This instrument can measure the amplitude
dependence and DC bias dependence of each impedance since it can also sweep the AC signal
amplitude and DC bias in addition to the frequency.
a) MEASUREMENT BLOCK
The measurement block consists of a signal generation section to supply a signal for
measurement to the DUT, voltage detection section, current detection section, and DFT
section to calculate impedance.
The signal generation section has a setting resolution of 10 µHz for the range of 10 µHz to
36 MHz based on the direct digital frequency synthesizer technology.
The current of the L
CUR
connector is converted to a voltage and then A/D conversion and DFT
calculation are performed to calculate the current vector (magnitude and phase angle). The
voltage vector is also calculated by performing A/D conversion and DFT calculation for the
voltage applied to the DUT. The impedance (magnitude and phase angle) of the DUT is
calculated by dividing the voltage vector by the current vector and then various error
corrections are made and the result is transferred to the UI CPU section.
b) UI CPU CKT
This displays the measurement data obtained by the measurement block on the LCD in
various graph formats. It also outputs measurement commands to the measurement block in
accordance with the settings from the front panel or a remote interface. The USB-A
connector is located on the front panel and is used for connecting a USB memory device.
c) POWER SUPPLY CKT
This supplies various power required by the measurement bock in addition to power for
digital section control.
d) REMOTE IF CKT
This performs communication with an external controller, such as outputting various
settings and measurement data. It converts between the communication protocols of the
GPIB, USB, RS-232, and LAN general interfaces and the internal communication protocol of
UI CPU CKT. The USB-B connector is located on the rear panel and is used for connecting
with a PC to control this instrument.
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