Programming instructions

© National Instruments Corporation 19-1 DAQ Hardware Overview Guide
19
NI 40 XX Devices
This chapter contains overview information on the NI 40XX devices,
including the NI 4050 and NI 4060 instruments.
For detailed descriptions of the hardware functionality and specifications
on the 4050 and 4060 instruments, see the user manual that shipped with
your device. Also, the 40XX instrument driver software documentation
contains detailed information on how to write programs to control the 4050
and 4060 devices for making measurements.
NI 40 XX Device Input
The NI 40XX devices have one input channel. NI 4050 instruments have
four measurement modes: 2-wire ohms, DC volts, true RMS AC, and
diode. NI 4060 instruments have additional modes: DC current, RMS AC
current, and 4-wire ohms. Both the 4050 and 4060 devices have five input
ranges for measuring DC voltages:
±
250 V,
±
25 V,
±
2 V,
±
200 mV, and
±
20 mV
.
The devices isolate signals up to 250 V.
The 4050 and 4060 devices have five input ranges for measuring AC
voltages: 250 V
RMS
,
25 V
RMS
,
2 V
RMS
,
200 mV
RMS
, and
20 mV
RMS
.
The 4050 and 4060 devices have five input ranges for measuring resistance:
2 MΩ, 200 kΩ, 20 kΩ, 2 kΩ, and 200 Ω. The devices measure resistance
by sending a current through the resistor under test and measuring the
voltage this current produces across the resistor. The devices also have an
extended ohms range. In this range, the device adds a 1 MΩ resistor in
parallel with the resistor under test, then calculates the value of the resistor
being tested. NI 4060 devices have 4-wire in addition to 2-wire ohms mode.
In these modes, the current used to excite the resistance under test is routed
externally to the device.
NI 4060 instruments have two input ranges for measuring current: 200 mA
and 20 mA. In current mode, the device measures current by routing the
signal through an internal shunt resistor; the current excites the shunt
resistor to produce a voltage. The device also has two ranges for measuring
true RMS AC current—200 mA RMS and 20 mA RMS.