ENGLISH User manual Copyright HT ITALIA 2012 Release EN 2.
HT321 - HT322 Table of contents: 1. SAFETY PRECAUTIONS AND PROCEDURES .......................................................... 2 1.1. 1.2. 1.3. 1.4. 2. 3. GENERAL DESCRIPTION ........................................................................................... 4 PREPARATION FOR USE ........................................................................................... 4 3.1. 3.2. 3.3. 3.4. 4. Preliminary .......................................................................................
HT321 - HT322 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 by this symbol . When taking measurements: Avoid doing that in humid or wet places. Avoid doing that in rooms where explosive gas, combustible gas, steam or excessive dust is present.
HT321 - HT322 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 When the instrument is connected to measuring circuits never touch any unused terminal When measuring resistors do not add any voltage.
HT321 - HT322 2. GENERAL DESCRIPTION This meter performs the herewith measurements: DC Voltage AC sine voltage Resistance Continuity test Diode test Temperature with type K probe (only HT322) All selectable by means of a 6-position rotary selector (including OFF position).
HT321 - HT322 4. OPERATING INSTRUCTIONS 4.1. INSTRUMENT DESCRIPTION 4.1.1. Front panel description CAPTION: 1. LCD 2. HOLD Key 3. R Key 4. MAX Key 5. SEL Key 6. Backlight Key(For HT322) 7. Function selector 8. COM input terminal 9. V input terminal (for 321) COM °C/°F input terminal (for and V HT322) Fig.
HT321 - HT322 4.2. DESCRIPTION OF FUNCTION KEYS 4.2.1. HOLD Key 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. 4.2.2. R (RANGE) Key By pressing R key, the manual mode is activated and the “AUTO” symbol disappears from the display. Press R cyclically to change the measuring range and fix the decimal point on the display.
HT321 - HT322 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. Switch on V . 2. Pressing the R key to select the correct range or using the Autorange feature (see § 4.2.2). If the voltage value under test is unknown, select the highest range. (for HT321) / 3.
HT321 - HT322 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 2. Pressing the R key to select the correct range or using the Autorange feature (see § 4.2.2). If the voltage value under test is unknown, select the highest range 3.
HT321 - HT322 4.3.3. Resistance measurement 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 measurement 1. Switch on 2. Pressing the R key to select the correct range or using the Autorange feature (see § 4.2.2). If the resistance value under test is unknown, select the highest range. 3.
HT321 - HT322 4.3.4. Diode test and Continuity test CAUTION Before taking resistance 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. Insert the test leads into the jack, the red plug into V (for HT321) / V °C°F (for HT322) jack, and black plug into COM jack (see Fig. 5) 3. Connect the test leads to the diode under test observing the proper polarities indicated in Fig. 5.
HT321 - HT322 4.3.5. Temperature measurement (only HT322) Fig. 6: Using the instrument for Temperature measurement 1. Switch on °C°F. 2. Pressing SEL key to select °C or °F measurements 3. Insert the T10 adapter optional accessory into V °C°F jack, and COM jack with respect of red and black colours (see Fig. 6) 4. Connect the optional K probe (see § 6.3.2) into the adapter with respect the correct positive and negative polarity then reading will be displayed 5.
HT321 - HT322 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. 5.2.
HT321 - HT322 6. TECHNICAL SPECIFICATIONS 6.1. TECHNICAL FEATURES Accuracy is indicated as [%reading + (number of digits*resolution)] at 23°C±5°C,<75%HR DC Voltage Range 200mV 2V 20V 200V 600V Resolution 0.1mV 0.001V 0.01V 0.1V 1V Accuracy Input Impedance Overload protection 10M 600VDC/ACrms Input Impedance Overload protection (0.8%rdg +1dgt) (1.0%rdg +2dgt) AC Voltage Accuracy (45 400Hz) not declared Range Resolution 200mV 2V 20V 200V 600V 0.1mV 0.001V 0.01V 0.1V 1V (1.
HT321 - HT322 6.1.1. Safety The instrument complies with: Insulation: Pollution degree: Overvoltage category: Max height of use: IE/EN61010-1 double insulation 2 CAT III 1000V, CAT IV 600V 2000m (6561ft) 6.1.2. General data Mechanical characteristics Dimensions (L x W x H): Weight (including battery): 163 x 88 x 48mm (6.4 x 3.5 x 1.9in) 280g (9.9 ounces) Power supply Battery type: Indication of low battery: Battery life: 2 x1.5V batteries type AAA MN2400 LR03 AM4 symbol " " is displayed Approx.
HT321 - HT322 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. Should you need for any reason to return back the instrument for repair or replacement take prior agreements with the local distributor from whom you bought it.
