§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.
All the DCX-127 output functions are controlled from APWIN
software, and all of the inputs are displayed in APWIN software and
may be displayed as bargraphs or plotted values during a sweep when
appropriate.
The DCX-127 Multifunction Module is a separate unit packaged in
a one-rack-unit high case that may be rack-mounted or used as a
bench instrument.
The following sections describe the capabilities in greater detail.
Complete specifications can be found at the end of this manual.
DC Voltage Measurements
The DCX-127 includes a 4-1/2 digit autoranging dc voltmeter-
ohmmeter. In voltage mode, the meter will automatically select among
its 200 mV, 2 V, 20 V, 200 V, or 500 V ranges for best resolution of the
measured signal. It may also be fixed on any of its ranges. The meter
has selectable reading rates of 6 or 25 readings per second. The
6/second selection provides full 4-1/2 digital resolution (20,000 counts
full scale). The 25/second selection also displays 4-1/2 digits, but the
last digit will always be either 0 or 5. Normal mode rejection and
common mode rejection also degrade by approximately a factor of
DC Voltage Measurements Description
Page 2 DCX-127 Multifunction Module User’s Guide
