CEM DT-932N - User Manual

OPERATING INSTRUCTION
True RMS
AUTORANGING MULTIMETER
COM
MAX
10A
15 min.
every
MAX
Ω
V
C
F

Summary

SAFETY INFORMATION

SAFETY SYMBOLS

CONTROLS AND JACKS

Liquid Crystal Display (LCD)

Describes the primary display unit and its symbolic indicators.

Function Switch

Details the primary rotary switch for selecting measurement functions.

10 A Input Jack

Specifies the input jack for high current measurements.

COM Input Jack

Identifies the common terminal for all measurements.

Positive Input Jack

Indicates the primary input terminal for voltage and resistance measurements.

General Specifications

Compliance and Safety Standards

Details instrument compliance and overvoltage protection categories.

Display and Insulation

Describes the LCD display capabilities and insulation class.

Operating and Storage Conditions

Environmental and Physical Specifications

Covers operating/storage environment, height, pollution degree, power, and dimensions.

DC Voltage Specifications

DC Voltage Range and Accuracy

Details DC voltage measurement ranges, resolutions, and accuracies.

DC Voltage Input Impedance and Max Input

Specifies input impedance and maximum voltage limits for DC.

AC Voltage Specifications

AC Voltage Range and Accuracy

Details AC voltage measurement ranges, resolutions, and accuracies.

AC Voltage Input Impedance and Frequency Range

Specifies AC input impedance, frequency range, and max input.

DC Current Specifications

DC Current Range and Accuracy

Details DC current measurement ranges, resolutions, and accuracies.

AC Current Specifications

AC Current Range and Accuracy

Details AC current measurement ranges, resolutions, and accuracies.

Resistance Specifications

Resistance Measurement Ranges and Accuracy

Details resistance measurement ranges, resolutions, and accuracies.

Resistance Maximum Input

Specifies the maximum input voltage for resistance measurements.

Capacitance Specifications

Capacitance Measurement Ranges and Accuracy

Details capacitance measurement ranges, resolutions, and accuracies.

Frequency Measurement Specifications

Frequency Measurement Ranges and Accuracy

Details frequency measurement ranges, resolutions, and accuracies.

Frequency Measurement Sensitivity and Max Input

Specifies sensitivity and maximum input for frequency measurements.

Temperature Measurement Specifications

Temperature Measurement Ranges and Accuracy

Details temperature measurement ranges and accuracies.

Temperature Sensor and Overload Protection

Identifies the temperature sensor type and overload protection.

Diode Test Specifications

Diode Test Parameters and Accuracy

Details test current, open circuit voltage, resolution, and accuracy for diode testing.

Audible Continuity Specifications

Continuity Check Parameters

Specifies audible threshold and test current for continuity checks.

OPERATION

General Operating Instructions

Provides initial setup and basic operational guidelines.

Overrange Indication Handling

Explains how to interpret and respond to 'OL' display.

AUTORANGING;MANUAL RANGE SELECTION

Autoranging Mode

Describes the automatic range selection feature.

Manual Range Selection Procedure

Details steps to manually select measurement ranges.

Exiting Manual Ranging

Explains how to return to autoranging.

MAX;MIN Function

Activating MAX;MIN Recording

Explains how to start recording maximum and minimum values.

Displaying Minimum Values

Describes how to view the minimum recorded reading.

Exiting MAX;MIN Mode

Details the procedure to exit the MAX/MIN function.

DISPLAY BACKLIGHT

HOLD Function

NON-CONTACT VOLTAGE (NCV) Operation

Hz;duty Measurement

DC VOLTAGE MEASUREMENTS

Safety Caution for DC Voltage

Warns about potential damage from voltage surges during DC measurements.

Procedure for DC Voltage Measurement

Step-by-step guide for measuring DC voltage.

AC VOLTAGE MEASUREMENTS

Reading AC Voltage

Explains how to read the displayed AC voltage value and symbol.

Safety Warning for AC Voltage

Warns about risks when measuring AC voltage in outlets.

Safety Caution for AC Voltage

Warns about potential damage from voltage surges during AC measurements.

Procedure for AC Voltage Measurement

Step-by-step guide for measuring AC voltage.

DC CURRENT MEASUREMENTS

Caution for DC Current Measurement

Warns about time limits for 10A scale to prevent damage.

Procedure for DC Current Measurement

Step-by-step guide for measuring DC current.

AC CURRENT MEASUREMENTS

Warning for AC Current Measurement

Warns about voltage limits when measuring AC current.

Caution for AC Current Measurement

Warns about time limits for 10A scale to prevent damage.

Procedure for AC Current Measurement

Step-by-step guide for measuring AC current.

RESISTANCE MEASUREMENTS

Warning for Resistance Measurement

Warns to disconnect power and discharge capacitors before measuring resistance.

Procedure for Resistance Measurement

Step-by-step guide for measuring resistance.

CONTINUITY CHECK

Warning for Continuity Check

Warns against measuring continuity on live circuits.

Procedure for Continuity Check

Step-by-step guide for performing a continuity check.

DIODE TEST

Continuity Check Result Interpretation

Explains how to interpret the audible signal and resistance reading.

Warning for Diode Test

Warns against testing diodes with voltage applied.

Procedure for Diode Test

Step-by-step guide for testing diodes.

Diode Test Result Interpretation

Explains how to evaluate diode test results.

FREQUENCY MEASUREMENT

Procedure for Frequency Measurement

Step-by-step guide for measuring frequency.

CAPACITANCE MEASUREMENTS

Warning for Capacitance Measurement

Warns to disconnect power and discharge capacitors before measuring capacitance.

Procedure for Capacitance Measurement

Step-by-step guide for measuring capacitance.

TEMPERATURE MEASUREMENTS

Warning for Temperature Measurement

Warns to disconnect probes from voltage before temperature measurement.

Procedure for Temperature Measurement

Step-by-step guide for measuring temperature.

Post-Measurement Warning

Warns to remove thermocouple before changing function.

REPLACING THE BATTERY

Low Battery Indicator

Explains the 'BAT' indicator for battery replacement.

BATTERY INSTALLATION

Provides instructions for installing a new battery.

REPLACING THE FUSES

Fuse Replacement Procedure

Step-by-step guide for replacing fuses.

Fuse Specification

Specifies the correct fuse size and type for the 10A range.

Overview

1. Function Description
2. Measurement Capabilities
3. Important Technical Specifications
4. Usage Features
5. Maintenance Features

This document describes the operating instructions for a True RMS Autoranging Multimeter.

Function Description:

The multimeter is a True RMS autoranging device designed for various electrical measurements. It features a 6000-count Liquid Crystal Display (LCD) with symbolic signs for easy reading. The device includes a function switch to select different measurement modes and several pushbuttons for additional features.

Measurement Capabilities:

• DC Voltage: Measures DC voltage with ranges from 600.0mV to 1000V.
• AC Voltage: Measures AC voltage with ranges from 6.000V to 1000V. It is a True RMS meter, meaning it accurately reads both sine waves and non-sine wave or distorted signals.
• DC Current: Measures DC current with ranges of 6A and 10A.
• AC Current: Measures AC current with ranges of 6A and 10A.
• Resistance: Measures resistance with ranges from 600.0Ω to 60.00MΩ.
• Capacitance: Auto-ranging capacitance measurements with ranges from 40.00nF to 4000uF.
• Frequency: Auto-ranging frequency measurements with ranges from 9.999Hz to 10MHz.
• Temperature: Measures temperature in both Celsius (-20°C to +760°C) and Fahrenheit (-4°F to +1400°F) using a Type K Thermocouple sensor.
• Diode Test: Performs diode tests, displaying the forward voltage.
• Audible Continuity: Checks for continuity with an audible signal if resistance is less than approximately 100Ω.
• Non-Contact Voltage (NCV): Detects AC voltage without direct contact, indicated by a flashing red rim on the LCD and a motor shaking.

Important Technical Specifications:

• Display: 6000 counts LCD with function indication.
• Compliance: EN61010-1.
• Insulation: Class2, Double insulation.
• Overvoltage Category: CATIII 600V, CATII 1000V.
• Polarity: Automatic, with (-) negative polarity indication.
• Overrange: "OL" mark indication.
• AC Response: True RMS (50 Hz or 60 Hz).
• Measurement Rate: 2 times per second, nominal.
• Auto Power Off: Automatically shuts down after approximately 15 minutes of inactivity.
• Operating Environment: 0°C to 50°C (32°F to 122°F) at < 70% relative humidity.
• Storage Temperature: -20°C to 60°C (-4°F to 140°F) at < 80% relative humidity.
• Max Height (for inside use): 2000m.
• Pollution Degree: 2.
• Power: One 9V battery, NEDA 1604, IEC 6F22.
• Dimensions: 150 (H) x 70 (W) x 48 (D) mm.
• Weight: Approximately 255g.
• Accuracy: Specified at 18°C to 28°C (65°F to 83°F), less than 70% RH.
  • DC Voltage: ±0.5% to ±1.5% of rdg + dgts. Input Impedance: 7.8MΩ. Max Input: 1000V dc or 1000V ac rms.
  • AC Voltage: ±1.5% to ±2.0% of rdg + dgts. Input Impedance: 7.8MΩ. Frequency Range: 50 to 60Hz. Max Input: 1000V dc or 1000V ac rms.
  • DC Current: ±2.5% of rdg + 5 dgts. Overload Protection: 10A / 250V Fuse. Max Input: 10A dc or ac rms on 10A DC range.
  • AC Current: ±3.0% of rdg + 5 dgts. Overload Protection: 10A / 250V Fuse. Frequency Range: 50 to 60 Hz. Max Input: 10A dc or ac rms on 10A AC range.
  • Resistance: ±1.0% to ±5.0% of rdg + dgts. Max Input: 600V dc or 600V ac rms.
  • Capacitance: ±3.0% to ±5.0% of rdg + dgts. Max Input: 600V dc or 600V ac rms.
  • Frequency: ±1.2% to ±1.5% of rdg + dgts. Sensitivity: >0.5V RMS while ≤1MHz; >3V RMS while >1MHz. Max Input: 600V dc or 600V ac rms.
  • Temperature: ±3% of rdg (+5°C/9°F). Overload protection: 600V dc or ac rms.
  • Diode Test: 0.3mA typical test current, 1.5V dc typical open circuit voltage. Overload protection: 600V dc or ac rms.
  • Audible Continuity: Threshold <100Ω, Test current <0.3mA. Overload protection: 600V dc or ac rms.

Usage Features:

• Autoranging/Manual Range Selection: The meter defaults to Autoranging, automatically selecting the best range. Users can manually select ranges by pressing the "RANGE" key and holding it for 2 seconds to return to Autoranging. Manual ranging does not apply to Frequency functions.
• HOLD Function: Freezes the current reading on the display. Activated and exited by momentarily pressing the "HOLD" key.
• MAX/MIN Recording Mode: Records and displays the maximum ("MAX") or minimum ("MIN") readings. The meter "locks" into the displayed range when activated. If a reading exceeds this range, "OL" will be displayed.
• Display Backlight: Activated by holding the "HOLD" key for >1 second. Automatically turns off after 10 seconds.
• Safety Precautions:
  • Always inspect the meter and test leads for damage before use.
  • Never ground yourself during measurements.
  • Avoid touching exposed metal parts at ground potential.
  • Turn off power to the circuit before making current measurements.
  • Exercise caution when working with voltages above 60V dc or 30V ac rms.
  • Keep fingers behind probe guards.
  • Do not exceed the meter's voltage or current limits.
  • Always turn the function switch to the OFF position when not in use.
  • "OL" indicates an over-range condition, requiring a higher range selection.
  • For current measurements on the 10A scale, do not exceed 30 seconds to prevent damage.
  • Disconnect power and discharge capacitors before resistance or capacitance measurements.
  • Do not measure continuity or test diodes on circuits with voltage.
  • Ensure the thermocouple is removed before changing measurement functions.

Maintenance Features:

• Battery Replacement: The "BAT" symbol indicates a low battery. The battery door is secured by a screw and requires a Phillips head screwdriver to open. Always disconnect test leads before opening the battery door.
• Fuse Replacement: Fuses are located behind the battery door. Always disconnect test leads and power before opening the fuse door. Use a 10A/250V fast blow fuse for the 10A range. Ensure the fuse door is securely fastened before operating the meter.
• Troubleshooting: If the meter malfunctions, check the fuses and battery for proper insertion and condition.

CEM DT-932N Specifications