1. Isingeniso
The Brother HD-390D is a high-precision analog multimeter designed for electricians, hobbyists, and home maintenance tasks. It provides accurate measurements for AC/DC voltage, AC/DC current, resistance, and battery levels. This manual provides essential information for safe and effective operation of your device.
2. Ulwazi Lokuphepha
WARNING: READ AND UNDERSTAND THIS MANUAL BEFORE USING THE INSTRUMENT. Failure to understand and comply with the WARNING and operating instructions can result in serious or fatal injuries and/or property damage.
- Always ensure the multimeter is set to the correct function and range before connecting to a circuit.
- Do not exceed the maximum input ratings for any function.
- Use caution when working with live circuits. High voltages can be dangerous.
- Inspect test leads for damage before each use. Replace if insulation is cracked or wires are exposed.
- Qinisekisa ukuthi isembozo sebhethri sivaliwe kahle ngaphambi kokusebenza.
- For continued protection against fire, replace fuses only with specified types: 0.5A/250V and 10A/250V.
3. Okuqukethwe Kwephakheji
Qinisekisa ukuthi zonke izinto zikhona kuphakheji yakho:
- Brother HD-390D Analog Multimeter
- Ama-Test Lead (Obomvu Nomnyama)
- Imanuwali Yeziqondiso Zokusebenza
- Protective Carrying Case (may be included depending on variant)
Figure 3.1: Multimeter with test leads and optional carrying case.
Ividiyo 3.1: Ukukhipha ibhokisi kanye nokuqala kabushaview of the Brother HD-390D Analog Multimeter.
4. Umkhiqizo Uphelileview
The HD-390D features a clear analog display, a central rotary switch for function and range selection, and input jacks for test leads. An Ohm adjustment knob is provided for resistance measurements.
Figure 4.1: Front panel of the HD-390D Multimeter.
Izingxenye Ezibalulekile:
- Isibonisi se-Analog: Large, easy-to-read scale for measurement readings.
- I-Rotary Switch: Selects measurement function (Voltage, Current, Resistance, Battery) and range.
- Okokufaka Jacks: Connect test leads. 'COM' for common (black lead), 'VΩmA+' for positive (red lead) for most measurements, '+10A' for high current measurements.
- Ω ADJ Knob: Used to zero the meter for resistance measurements.
- Transistor/Diode Test Sockets: Dedicated sockets for testing transistors (NPN/PNP hFE) and diodes.
5. Setha
5.1 Ukufakwa kwebhethri
The multimeter requires two 1.5V AAA batteries and one 9V battery for operation. These are not included.
- Locate the battery cover on the back of the multimeter.
- Slide the cover down and open as indicated by the 'PULL DOWN' and 'OPEN' markings.
- Insert the two 1.5V AAA batteries and one 9V battery, observing correct polarity.
- Vala ikhava yebhethri ngokuphephile.
Figure 5.1: Back panel with battery and fuse access.
5.2 Ukuxhumanisa Imihlahlandlela Yokuhlola
Always connect the test leads correctly for accurate and safe measurements.
- Faka i-black test lead ku-'COM' (Common) jack.
- Ngezilinganiso eziningi (Umqulutage, Resistance, low Current), insert the red test lead into the 'VΩmA+' jack.
- For high current measurements (up to 10A), insert the red test lead into the '+10A' jack.
Figure 5.2: Multimeter with test leads connected.
6. Iziqondiso Zokusebenza
Before taking any measurement, ensure the test leads are properly connected and the rotary switch is set to the desired function and range.
6.1 DC Umqtage Measurement (DC V)
- Connect the red lead to 'VΩmA+' and the black lead to 'COM'.
- Set the rotary switch to the desired DC V range (e.g., 0.1V, 0.5V, 2.5V, 10V, 50V, 250V, 1000V). Start with the highest range if the voltage akwaziwa.
- Connect the test probes in parallel across the component or circuit to be measured.
- Funda ivolumutage value from the appropriate DC V scale on the analog display.
6.2 AC Umqtage Measurement (AC V)
- Connect the red lead to 'VΩmA+' and the black lead to 'COM'.
- Set the rotary switch to the desired AC V range (e.g., 10V, 50V, 250V, 1000V). Start with the highest range if the voltage akwaziwa.
- Connect the test probes in parallel across the component or circuit to be measured.
- Funda ivolumutage value from the appropriate AC V scale on the analog display.
6.3 DC Current Measurement (DC A)
- For currents up to 250mA, connect the red lead to 'VΩmA+' and the black lead to 'COM'. For currents up to 10A, connect the red lead to '+10A' and the black lead to 'COM'.
- Set the rotary switch to the desired DC A range (e.g., 0.05mA, 0.25mA, 2.5mA, 25mA, 250mA, 10A). Start with the highest range if the current is unknown.
- Okubalulekile: Connect the multimeter in series with the circuit to be measured. Break the circuit and insert the meter.
- Read the current value from the appropriate DC A scale.
6.4 AC Current Measurement (AC A)
- For currents up to 250mA, connect the red lead to 'VΩmA+' and the black lead to 'COM'. For currents up to 10A, connect the red lead to '+10A' and the black lead to 'COM'.
- Set the rotary switch to the desired AC A range (e.g., 0.05mA, 0.25mA, 2.5mA, 25mA, 250mA, 10A). Start with the highest range if the current is unknown.
- Okubalulekile: Connect the multimeter in series with the circuit to be measured. Break the circuit and insert the meter.
- Read the current value from the appropriate AC A scale.
6.5 Resistance Measurement (Ω)
- Connect the red lead to 'VΩmA+' and the black lead to 'COM'.
- Set the rotary switch to the desired Resistance range (e.g., X1, X10, X1K, X10K, X100K).
- Ukulungiswa Kweziro: Short the test leads together. While shorted, adjust the 'Ω ADJ' knob until the needle points to '0' on the Ohm scale. This must be done for each resistance range.
- Connect the test probes across the component to be measured (ensure the component is de-energized).
- Read the resistance value from the Ohm scale and multiply by the selected range multiplier.
6.6 Battery Test (BATT)
- Connect the red lead to 'VΩmA+' and the black lead to 'COM'.
- Set the rotary switch to the 'BATT' function (1.5V or 9V).
- Connect the test probes to the battery terminals, observing polarity.
- Funda umthamo webhethritage from the appropriate battery scale.
6.7 Diode and Transistor Check
- Set the rotary switch to the 'Ω X 10' range for transistor and diode checks.
- For transistor hFE measurement, insert the transistor leads into the appropriate NPN or PNP sockets.
- For diode check, use the extra jack as indicated in the specifications.
6.8 Ukuhlola Ukuqhubeka
- Set the rotary switch to the 'Continuity Check' position (often indicated by a speaker icon).
- Xhuma ama-probe okuhlola kulo lonke isekethe noma ingxenye.
- If the resistance is less than 200 Ohms, the beeper will sound, indicating continuity.
7. Imininingwane
The following table details the technical specifications of the Brother HD-390D Analog Multimeter:
Umfanekiso 7.1: DC Voltage Imininingwane.
Umdwebo 7.2: I-AC Voltage, Current, Resistance, and other Specifications.
| Isici | Ukucaciswa |
|---|---|
| I-AC Voltage Amabanga | 0.1V, 0.5V, 2.5V, 10V, 50V, 250V, 1000V |
| I-DC Voltage Amabanga | 0.1V, 0.5V, 2.5V, 10V, 50V, 250V, 1000V |
| AC Current Ranges | 0.05mA, 0.25mA, 2.5mA, 25mA, 250mA, 10A |
| DC Current Ranges | 0.05mA, 0.25mA, 2.5mA, 25mA, 250mA, 10A |
| Izindlela Zokumelana | X1 (0.2 ~ 2KΩ), X10 (2 ~ 20KΩ), X1K (200 ~ 2MΩ), X10K (2K ~ 20MΩ), X100K (20K ~ 200MΩ) |
| Ukuhlola Ibhethri | 1.5v, 9v |
| I-Transistor Check | hFE: 0-1000 (via extra jack, at Ω X 10 Range) |
| I-Diode Check | IF, IR, LI, LV (at Ω X 10 Range) |
| Ukuhlola Okuqhubekayo | Beeper sounding (<200 Ohm) |
| Ukunikezwa kwamandla kagesi | 2 x 1.5V AAA batteries, 1 x 9V battery |
| Imodi yokusebenza | Ibanga leManuwali |
| Isitifiketi | CE |
| Standard Environmental Conditions | 23°C ± 5°C, humidity <75% RH |
| Working Environment Range | 0°C ~ 40°C, humidity <90% RH |
| Ubukhulu | 160mm x 105mm x 40mm |
8. Isondlo
8.1 Ukuhlanza
To clean the multimeter, wipe the case with a damp cloth and a mild detergent. Do not use abrasives or solvents. Ensure the device is powered off and disconnected from any circuits before cleaning.
8.2 Ukushintshwa Kwebhethri
When the battery indicator shows low power, replace the batteries promptly to ensure accurate readings. Refer to Section 5.1 for battery installation instructions.
8.3 Ukushintshwa kwe-Fuse
If the current measurement function stops working, the fuse may be blown. To replace the fuse:
- Ensure the multimeter is powered off and disconnected from all circuits.
- Open the battery cover on the back of the unit (refer to Figure 5.1).
- Carefully remove the old fuse(s).
- Replace with new fuses of the specified ratings: 0.5A/250V for mA ranges and 10A/250V for the 10A range.
- Vala ikhava yebhethri ngokuphephile.
9. Ukuxazulula izinkinga
- No reading or unstable reading: Check battery levels and replace if necessary. Ensure test leads are securely connected and not damaged. Verify the rotary switch is set to the correct function and range.
- Incorrect resistance reading: Perform Ohm adjustment (zeroing) as described in Section 6.5. Ensure the component being tested is de-energized.
- Current measurement not working: Check the fuse(s) and replace if blown (refer to Section 8.3). Ensure the meter is connected in series with the circuit.
- Needle not moving: Ensure the meter is powered on (if applicable for specific functions) and the test leads are making good contact.
10. Amathiphu Womsebenzisi
- Always start with the highest range: Lapho kukala ivolumu engaziwatage or current, always start with the highest range setting and then decrease it until you get a suitable reading. This prevents overloading the meter.
- Zero Ohm adjustment: Remember to perform the Ohm adjustment (zeroing) every time you change the resistance range for accurate readings.
- Observe polarity: For DC measurements, observing polarity is important. If the needle deflects backward, reverse the test leads.
- Analog vs. Digital: Analog multimeters are great for observing trends and fluctuating signals, as the needle movement can show changes more dynamically than a digital display.
11. Iwaranti kanye Nokusekela
For warranty information or technical support, please refer to the documentation provided at the point of purchase or contact your vendor. Keep your purchase receipt as proof of purchase.
