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Table of Contents
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Summary of Contents for HT HT21
- Page 1 ENGLISH User manual Copyright HT ITALIA 2010 Release EN 1.01 - 19/01/2011...
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Page 2: Table Of Contents
HT21 Table of Content: SAFETY PRECAUTIONS AND PROCEDURES ............2 1.1. Preliminary ........................2 1.2. During use ......................... 3 1.3. After use ..........................3 1.4. Measuring (overvoltage) categories definitions ..............3 GENERAL DESCRIPTION ................... 4 PREPARATION FOR USE ................... 4 3.1. -
Page 3: Safety Precautions And Procedures
HT21 1. SAFETY PRECAUTIONS AND PROCEDURES This meter is compliance with safety Standard IEC/EN61010-1 related to electronic measuring instruments. For your own safety and to avoid damaging the instrument follow the procedures described in this instruction manual and read carefully all notes preceded... -
Page 4: During Use
HT21 1.2. DURING USE Read the recommendations which follow and the instructions in this manual: CAUTION An improper use may damage the instrument and/or its components or injure the operator. When changing the range, first disconnect the test leads from the circuit under test in order to avoid any accident ... -
Page 5: General Description
HT21 2. GENERAL DESCRIPTION The HT21 meter performs, in completely Autorange, the herewith measurements: DC Voltage AC sine voltage Resistance and Continuity test Capacitance Frequency Duty cycle Diode test All selectable by means of a 5 position rotary selector (including OFF position). Also are... -
Page 6: Operating Instructions
HT21 4. OPERATING INSTRUCTIONS 4.1. INSTRUMENT DESCRIPTION 4.1.1. Front panel description LEGEND: 1. LCD 2. Rotary selector 3. COM input jack 4. VHz% CAP input jack 5. MODE key 6. Hz% key 7. HOLD/ 8. REL key 9. Battery cover Fig. -
Page 7: Description Of Function Keys
HT21 4.2. DESCRIPTION OF FUNCTION KEYS 4.2.1. HOLD/ By pressing HOLD/ key the measured value is frozen on the display where the symbol "HOLD" appears. Pressing again HOLD to disable this function and resume normal operation. By pressing the key at least 1 second the enable/disable of backlight feature can be performed. -
Page 8: Measurements
HT21 4.3. MEASUREMENTS 4.3.1. DC Voltage measurement CAUTION The maximum input for DC voltage is 600V. Do not attempt to measure higher voltages to avoid electrical shocks or damages to the instrument. Fig. 2: Using the meter for DC voltage measurement 1. -
Page 9: Ac Voltage Measurement
HT21 4.3.2. AC Voltage measurement CAUTION The maximum input for AC voltage is 600V. Do not attempt to measure higher voltages to avoid electrical shocks or damages to the instrument. Fig. 3: Using the instrument for AC voltage measurement 1. Switch on . -
Page 10: Resistance And Continuity Test Measurements
HT21 4.3.3. Resistance and Continuity Test measurements CAUTION Before taking resistance measurements in circuit remove power from the circuit being tested and discharge all capacitors. Fig. 4: Using the instrument for resistance and continuity test measurements 1. Switch on ... -
Page 11: Diode Test
HT21 4.3.4. Diode test CAUTION Before taking diode test measurements in circuit remove power from the circuit being tested and discharge all capacitors. Fig. 5: Using the instrument for diode test 1. Switch on 2. Pressing the MODE key until the symbol... -
Page 12: Frequency And Duty Cycle Measurements
HT21 4.3.5. Frequency and Duty Cycle measurements CAUTION The maximum input for AC voltage is 250V. Do not attempt to measure higher voltages to avoid electrical shocks or damages to the instrument. Fig. 6: Using the instrument for frequency and duty cycle measurements 1. -
Page 13: Capacitance Measurement
HT21 4.3.6. Capacitance measurement CAUTION Before taking capacitance measurement in circuit remove power from the circuit being tested and discharge all capacitors. Connect the test capacitor to the inputs respecting the polarity connections when required. Fig. 7: Using the instrument for capacitance measurement 1. -
Page 14: Maintenance
HT21 5. MAINTENANCE 5.1. GENERAL INFORMATION This is a precision instrument. To guarantee its performances be sure to use it according to these instructions and keep it stored on suitable environmental conditions. Do not expose it to high temperatures or humidity or direct sunlight. Be sure to turn it off after use. If you expect not to use the instrument for a long period remove batteries to avoid leakages of battery liquid which could damage the its inner components. -
Page 15: Technical Specifications
HT21 6. TECHNICAL SPECIFICATIONS 6.1. TECHNICAL FEATURES The accuracy is calculated as [%reading + (number of digits)*resolution]. It is referred to the following environmental conditions: temperature 18°C28°C (64°F82°F), <70%RH DC Voltage (Autorange) Range Resolution Accuracy Input impedance Overload protection 4.000V 0.001V... -
Page 16: Safety
This product conforms to the prescriptions of the European directive on low voltage 2006/95/EEC (LVD) and to EMC directive 2004/108/EEC 6.3. ACCESSORIES 6.3.1. Standard accessories HT21 meter Test leads - Cod. KIT4000A Battery Carrying case User manual... -
Page 17: Service
HT21 7. SERVICE 7.1. WARRANTY CONDITIONS This instrument is guaranteed against material or production defects, in accordance with our general sales conditions. During the warranty period the manufacturer reserves the right to decide either to repair or replace the product.
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