User manual
Table Of Contents
- Agilent U1231A, U1232A, and U1233A Handheld Digital Multimeter
- Table of Contents
- List of Figures
- List of Tables
- 1 Introduction
- 2 Making Measurements
- 3 Multimeter Features
- 4 Multimeter Setup Options
- Using the Setup Menu
- Setup Menu Summary
- Setup Menu Items
- Changing the variation count
- Enabling and changing the Smooth refresh rate
- Enabling and changing the voltage alert level
- Changing the beep frequency
- Changing the auto power-off (APO) timeout
- Changing the LCD backlight timeout
- Adjusting the LCD backlight intensity
- Enabling the LED flashlight timeout
- Adjusting the LED flashlight intensity
- Changing the minimum measurable frequency
- Changing the continuity test alerts
- Changing the power-on greeting tone
- Resetting the Setup items
- Changing the scale conversion value
- Enable the AC/DC mV measurement
- Enable open continuity test by default
- Changing the temperature unit
- 5 Characteristics and Specifications
Making Measurements 2
Measuring Frequency
U1231A/U1232A/U1233A User’s Guide 61
Measuring Frequency
Your multimeter allows simultaneous monitoring of real-
time voltage or current with frequency measurements.
Table 2- 2 highlights the functions allowing frequency
measurements in your multimeter.
Table 2 - 2 Functions allowing frequency measurement
Legend
U1233A U1232A U1231A
Hz
Hz
Hz
Hz
Hz
AUX
Hz
Hz
Hz
WARNING
Never measure the frequency where the voltage or current level
exceeds the specified range. Manually set the voltage or current
range if you want to measure frequencies below 20 Hz.
NOTE
• Measuring the frequency of a signal helps detect the presence of
harmonic currents in neutral conductors and determines whether these
neutral currents are the result of unbalanced phases or non-linear
loads.
• Frequency is the number of cycles a signal completes each second.
Frequency is defined as 1/Period. Period is defined as the time
between the middle threshold crossings of two consecutive,
like-polarity edges, as shown in Figure 2-26.
• The multimeter measures the frequency of a voltage or current signal
by counting the number of times the signal crosses a threshold level
within a specified period of time.