ELECTRO SYSTEMS DT9205A - User Manual

DT9205A Digital Multimeter
1. INTRODUCTION
The DT9205A Digital Multimeter is a precision, battery powered, 3-1/2 digit LCD Digital Instrument.
 High accuracy
 Digit height 33mm
 Single 32 position rotary switch for FUNCTION and RANGE selection, allows fast and convenient operation.
 Curvilinear soft case.
 Auto-Power Off
2. GENERAL SPECIFICATION
 Display: 3-1/2 digits LCD with a maximum reading of 1999.
 Measurement rate: updates 2-3 sec.
 Over range indication: "1" figure only in the display
 Automatic negative polarity indication.
 The symbol is displayed when the battery voltage drops below the operating voltage.
 Full range over load protection.
 Capacitance measurement Auto-zeroing.
 Auto Power Off. Automatic cut off approx. 15 minutes after the power on. It needs to be switched off and on
again to continue operation.
 Operating temperature: 0°C~40°C, 0~75% R.H. Storage temperature: -10°C~50°C, 0~75% R.H.
 Power: Single standard 9V battery.
 Dimensions: 191mm L x 89mm W x 35mm H.
 Weight: approx 310g (including battery)
 Accessories: test leads, spare fuse 0.5A (in case), Operating instructions.
3. ELECTRICAL SPECIFICATIONS
Accuracy is given as ± (% of reading + number of least significant digits) for one year, at 23°C±5°C RH<75%
3.1 DCV
Range
Accuracy
200mV
0.5% ± 1
2V
20V
200V
1000V
0.8% ± 2
Input impedance: 10MΩ on all ranges.

Summary

Product Introduction and Specifications

Introduction to DT9205 A Digital Multimeter

Overview of the DT9205A Digital Multimeter, a precision, battery-powered, 3-1/2 digit LCD instrument.

General Specifications of Digital Multimeter

Details key features like display, measurement rate, polarity indication, and auto power off.

DC Voltage Measurement Specifications

Specifies accuracy and input impedance for DC Voltage (DCV) ranges.

AC Voltage Measurement Specifications

Specifies accuracy, input impedance, and frequency range for AC Voltage (ACV) ranges.

DC Current Measurement Specifications

Specifies accuracy and measuring voltage drop for DC Current (DCA) ranges.

AC Current Measurement Specifications

Specifies accuracy, measuring voltage drop, and frequency range for AC Current (ACA) ranges.

Capacitance Measurement Specifications

Specifies accuracy for Capacitance measurement ranges.

Resistance Measurement Specifications

Specifies accuracy for Resistance (OHM) ranges, including special notes for 200MΩ.

Measurement Precautions and Methods

Precautions and Preparations for Measurement

Covers battery check, input limits, lead inspection, and general safety warnings during use.

DCV and ACV Measurement Procedure

Step-by-step guide for measuring DC and AC voltages, including notes on range selection.

DCA and ACA Measurement Procedure

Step-by-step guide for measuring DC and AC currents, including notes on range selection.

Resistance Measurement Procedure

Instructions for connecting leads and measuring resistance, with notes on over-range and 200MΩ range.

Capacitance Measurement Procedure

Procedure for measuring capacitance, including pre-measurement steps and safety warnings.

Diode and Continuity Test Procedure

Instructions for performing diode tests and continuity checks with the multimeter.

Transistor hFE Test Procedure

Guide for testing transistor hFE values, including type determination and insertion.

Battery and Fuse Replacement

Overview

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

The DT9205A Digital Multimeter is a precision, battery-powered, 3-1/2 digit LCD digital instrument designed for a wide range of electrical measurements. It boasts high accuracy and a clear display, making it suitable for both professional and hobbyist use.

Function Description:

The multimeter offers a comprehensive set of measurement functions, including:

• DC Voltage (DCV): Measures direct current voltage across various ranges from 200mV to 1000V.
• AC Voltage (ACV): Measures alternating current voltage across various ranges from 200mV to 750V.
• DC Current (DCA): Measures direct current across ranges from 2mA to 20A.
• AC Current (ACA): Measures alternating current across ranges from 2mA to 20A.
• Resistance (OHM): Measures resistance across ranges from 200Ω to 200MΩ.
• Capacitance (CAPACITANCE): Measures capacitance across ranges from 2nF to 20uF.
• Diode Test: Checks the forward voltage drop of diodes.
• Continuity Test: Provides an audible indication for low resistance connections.
• Transistor hFE Test: Measures the DC current gain of NPN and PNP transistors.

Important Technical Specifications:

• Display: 3-1/2 digits LCD with a maximum reading of 1999. The digit height is 33mm for easy readability.
• Measurement Rate: Updates every 2-3 seconds.
• Over Range Indication: Displays "1" when the measured value exceeds the selected range.
• Negative Polarity Indication: Automatic.
• Low Battery Indication: A battery symbol is displayed when the battery voltage drops below the operating voltage.
• Overload Protection: Full range overload protection is implemented.
• Capacitance Measurement: Features auto-zeroing for capacitance measurements.
• Auto Power Off: Automatically cuts off power approximately 15 minutes after power-on to conserve battery life. The device needs to be switched off and on again to continue operation.
• Operating Temperature: 0°C to 40°C (0-75% R.H.).
• Storage Temperature: -10°C to 50°C (0-75% R.H.).
• Power: Requires a single standard 9V battery.
• Dimensions: 191mm (L) x 89mm (W) x 35mm (H).
• Weight: Approximately 310g (including battery).
• Input Impedance (DCV/ACV): 10MΩ on all ranges.
• Frequency Range (ACV/ACA): 40 ~ 400Hz.
• Measuring Voltage Drop (DCA/ACA): 200mV.
• Accuracy: Specified for one year at 23°C±5°C RH<75%.
  • DCV: 0.5% ± 1 digit (2V-200V), 0.8% ± 2 digits (1000V).
  • ACV: 1.2% ± 3 digits (200mV, 750V), 0.8% ± 2 digits (2V-200V).
  • DCA: 1% ± 3 digits (2mA), 1.8% ± 3 digits (20mA-200mA), 2% ± 5 digits (20A).
  • ACA: 0.8% ± 1 digit (2mA-20mA), 1.2% ± 1 digit (200mA), 2% ± 5 digits (20A).
  • Capacitance: 2.5% ± 3 digits.
  • OHM: 0.8% ± 3 digits (200Ω), 0.8% ± 1 digit (2KΩ-2MΩ), 1% ± 2 digits (20MΩ), 5% ± 1 digit (200MΩ).
• Input Impedance (OHM): 10MΩ on all ranges.

Usage Features:

• Single Rotary Switch: A single 32-position rotary switch simplifies function and range selection, enabling fast and convenient operation.
• Curvilinear Soft Case: Provides a comfortable grip and protection for the instrument.
• Test Leads: Supplied with test leads for various measurements.
• Safety Precautions:
  • Always ensure the battery is correctly placed.
  • Do not exceed the specified input limits for each range to prevent damage to the meter or electrical shock.
  • Inspect test leads for damage before use and replace if necessary.
  • Select the proper function and range for the measurement.
  • Check the input terminal position for the red test lead based on the measurement range.
  • Remove one test lead from the circuit when changing ranges.
  • Avoid applying more than 500V between any terminal and earth ground.
  • Exercise caution when working above 60VDC or 25VAC rms due to shock hazards.
  • Switch off the power after measurement and remove the battery for extended storage to prevent leakage.
  • Do not tamper with the internal circuitry.
  • Avoid using or storing the instrument in high temperature and high humidity conditions.
• DCV & ACV Measurement:
  • Connect black lead to "COM" and red lead to "V/OHM".
  • Read the display value; polarity of the red lead connection will be indicated.
  • For unknown voltages, start with the highest range and work downwards.
  • "1" indicates over range; switch to a higher range.
  • Never attempt to measure voltage above 1000V.
• DCA & ACA Measurement:
  • Connect black lead to "COM" and red lead to "A" (for max 0.5A) or "20A" (for max 20A).
  • Read the display value; polarity at the red test lead connection will be indicated.
  • For unknown currents, start with the highest range and work downwards.
  • "1" indicates over range; switch to a higher range.
  • The 20A range is not fuse-protected and has a maximum 10A continuous current rating; measurement time should not exceed 15 seconds.
• Resistance Measurement:
  • Connect black lead to "COM" and red lead to "V/OHM".
  • Read the display value; the polarity of the red test lead is "+".
  • "1" indicates over range (open circuit or value exceeds selected range).
  • The 200MΩ range has a 1MΩ constant that must be subtracted from the displayed value.
• Capacitance Measurement:
  • Set the function range switch to "Cx".
  • Wait for the display to auto-zero before connecting the capacitor.
  • Connect the test capacitor to the "Cx" input socket (not test leads).
  • Ensure the capacitor is discharged before testing to prevent damage.
• Diode & Continuity Test:
  • Set the function range switch to the diode/continuity position.
  • Connect black lead to "COM" and red lead to "V/OHM".
  • An audible buzzer sounds if resistance between probes is less than 30±10Ω.
  • The meter displays the forward voltage drop for diodes; "1" indicates overload when the diode is reversed.
• Transistor hFE Test:
  • Set the function range switch to "hFE".
  • Determine if the transistor is NPN or PNP.
  • Correctly insert the transistor into the E.B.C connector.
  • The displayed reading is the approximate hFE value.

Maintenance Features:

• Battery Replacement:
  • Only perform battery replacement after disconnecting test leads and turning off power.
  • Loosen screws and remove the case bottom.
  • Replace the 9V battery, ensuring leads are not pinched.
• Fuse Replacement:
  • The meter is protected by a fast fuse (0.5A/250V) with dimensions of 5mm x 20mm.
  • Only perform fuse replacement after disconnecting test leads and turning off power.
  • Loosen screws and remove the case bottom.
  • Replace the fuse.
  • Replace the case bottom and reinstall the screws. Never operate the meter without the case bottom in place.
• Accessories: Includes test leads, a spare 0.5A fuse, and operating instructions.

ELECTRO SYSTEMS DT9205A Specifications

General

Brand	ELECTRO SYSTEMS
Model	DT9205A
Category	Multimeter
Language	English