National Instruments NI 4050 Manual De Usuario

© National Instruments Corporation

% 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

The following sections describe procedures for measuring DC and AC 
voltage, resistance, diode, and temperature, using the soft front panel.

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.