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Chapter 1 Taking Measurements with the NI 4050
© National Instruments Corporation 1-5 NI 4050 User Manual
% selects the percentage calculation. VirtualBench-DMM expresses the
displayed reading as a percent deviation from the reference value entered
in the Math Settings. Refer to Help»Online Reference, Math Settings topic
for more information about dB, dBm, mX+B, and percentage calculations.
The log button enables data logging. To configure the datalog file and log
interval, select Edit»Settings. Refer to Help»Online Reference, Logging
Measurements to Disk topic for more details.
Digits of Precision—A pop-up ring control in the DMM front panel display
allows you to set measurement accuracy to 3 1/2, 4 1/2, or 5 1/2. A larger
value gives greater precision but slower measurement performance. Refer
to Figure 1-3.
Figure 1-3. Digits of Precision
Use the Soft Front Panel
The following sections describe procedures for measuring DC and AC
voltage, resistance, diode, and temperature, using the soft front panel.
Measure DC and AC Voltage
Use the following procedure to measure DC and AC voltage using the soft
front panel:
1. Connect the test probes to voltage signals as shown in Figure 1-4. For
DC voltages, the HI (red) terminal is the positive terminal, and the
LO (black) terminal is negative. For AC voltages, positive and negative
terms are irrelevant.