User`s guide

2 Making Measurements

Measuring DC Voltage

40 U1273A/U1273AX User’s Guide

NOTE

• For firmware version 1.64 and below, the Filter function is switched off

by default. Customers are advised to update their products to the latest

firmware version to take advantage of the latest safety features and

measurement improvements.

• Press to cycle through the available dual display combinations. See

Appendix B, “Dual Display Combinations Using the Dual Key,” starting

on page 157 to learn more.

• Press to measure the frequency of the DC voltage source. See

“Measuring Frequency” on page 81 to learn more.

CAUTION

• For measuring AC voltage signals with a DC offset, refer to “Measuring

AC and DC Signals” on page 43.

• For measuring DC voltage from a mixed signal in DC measurement

mode, ensure that the Filter is enabled (Refer to “Enabling the filter” on

page 130).

• To avoid possible electric shock or personal injury, enable the

Filter(LPF) to verify the presence of hazardous DC voltages. Displayed

DC voltage values can be influenced by high frequency AC components

and must be filtered to assure an accurate reading.

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Dual