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Chapter 1 Taking Measurements with the NI 4050
NI 4050 User Manual 1-6 www.ni.com
The NI 4050 is protected against damage from voltages within
±250 VDC or 250 V
rms
in all ranges. You should never apply voltages
above these levels to the inputs.
Figure 1-4. Connecting Probes for Voltage Measurement
2. Select the mode you will measure:
•DC Volts
•AC Volts
3. Select the range for your measurement or autoranging:
• DC Volts—± 20 mV, ± 200 mV, ± 2 V, ± 25 V, and ± 250 V
• AC Volts—20 mV
rms
, 200 mV
rms
, 2 V
rms
, 25 V
rms
, and 250 V
rms
The value indicator displays the voltage measured.
Measure 2-Wire Resistance
Use the following procedure to measure 2-wire resistance using the soft
front panel:
1. Connect the test probes to a resistor as shown in Figure 1-5. To
accurately measure the value of a resistor, make sure the resistor is not
connected to any other circuits. Erroneous or misleading readings may
result if the resistor you are measuring is connected to external circuits
that supply voltages or currents or to external circuits that change the
effective resistance of that resistor.
AC Voltage
Source
DC Voltage
Source
+
–
250 V
MAX.
LO
HI
250 V
MAX.
LO
HI