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The module contains a 4-1/2 digit DC
voltmeter-ohmmeter, two 20-bit programmable DC voltage sources, 21 bits
of digital I/O, and three 8-bit programmable auxiliary output ports for
device control or status indicators. Typical applications include VCA
gain control linearity, VCA distortion, amplifier DC offset and power
supply checks, power amplifier load switching control, loudspeaker voice
coil resistance measurements, temperature measurements, test fixture
control, and testing DC parameters of A/D and D/A converters.
The DCX-127 also provides pulses and DC
levels whose timing depend upon key software actions such as end of
sweep, analyzer channel selection, or data settling. These may be used
for synchronization and sequencing of external devices or portions of
the test system such as the triggered sine burst generator.
All DCX-127 output functions are under
analyzer software control, and all of the inputs are displayed in the
control software and can be displayed as bar graphs or plotted values
during a sweep when appropriate.
DCX-127 features
- DC voltage and resistance measurements autoranging
from 200 mV to 500 V and 200 ohms to 2 Meg ohms full
scale, fully floating and protected for accurate
measurements in the presence of large common mode
voltages. Readings can be offset and scaled by the
software.
- Resistance measurements using either 4-wire or
2-wire techniques.
- Two independently programmable bipolar floating dc
voltage outputs, each with a ±10.5 V range, 20 mV
resolution and monotonicity to 40 mV (19 bits). The
software can sweep either dc source.
- Digital input of static or low-speed parallel
input, word width up to 21 bits. Digital output of a
parallel digital word of 21 bits.
- A simplified 8-bit program control interface that
can be defined to execute any pre-defined keystroke
sequence. This can be used to run different software
procedures based upon switch closures.
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