HoldPeak HP-39L Digital LCR Multimeter User Manual

1. Product Overview

The HoldPeak HP-39L is an accurate digital LCR meter designed for measuring resistance, capacitance, inductance, and testing transistors. It features a 1999 counts digit LCD monitor for clear readings and an automatic backlight for visibility in various lighting conditions.

Figure 1: HoldPeak HP-39L Digital LCR Multimeter in a typical application.

Key Features:

• Accurate digital LCR meter with 1999 counts digit LCD monitor.
• Measures resistance, capacitance, and inductance.
• Transistor hFE test function.
• Built-in CDS sensor for automatic LCD backlight control.
• Auto Power Off after 20 minutes of inactivity.
• Data Hold function to lock display values.
• Auto-zero & Auto-polarity functions.
• Over-range indication & Low battery indication.
• Anti-slip cover with test probe slots for protection and organization.
• Includes a wrist strap for convenient carrying and operation.

2. Product Components

Figure 2: Labeled diagram of the HP-39L Multimeter.

Component Identification:

• Test lead fixture: Holds test leads when not in use.
• CDS Sensor: Detects ambient light for automatic backlight control.
• LCD Display: 1999 counts digit display for readings.
• POWER Switch: Turns the device on/off.
• Transistor hFE test Input Jack: For testing transistors (PNP, NPN).
• HOLD key: Freezes the current reading on the display.
• Rotary Switch: Selects measurement functions and ranges.
• Ω Input Jack: For resistance measurements.
• COM/LC+ Input Jack: Common terminal for all measurements, and positive terminal for LCR measurements.
• LC- Input Jack: Negative terminal for LCR measurements.
• Protective casing: Provides durability and anti-slip grip.

3. Setup

3.1 Battery Installation

1. Ensure the multimeter is turned off.
2. Locate the battery compartment on the back of the device.
3. Unscrew the battery cover.
4. Insert one 9V (6F22) zinc-carbon battery, observing correct polarity.
5. Replace the battery cover and secure it with the screw.

Note: Batteries are not included in the standard package due to international shipping regulations. Please purchase them from your local store.

3.2 Connecting Test Leads

1. Insert the black test lead into the 'COM/LC+' input jack.
2. Insert the red test lead into the appropriate input jack for your measurement:
• For Resistance (Ω) measurements, use the 'Ω' input jack.
• For Capacitance (C) and Inductance (L) measurements, use the 'LC-' input jack.

3.3 Attaching the Wrist Strap

The multimeter comes with a wrist strap for added convenience and security. It can be attached to the back of the device, allowing you to wear it on your wrist during use.

4. Operating Instructions

4.1 Power On/Off and Backlight

• Press the red POWER button to turn the multimeter on.
• The LCD backlight will automatically activate in dark environments, thanks to the built-in CDS sensor.
• The device will automatically power off after 20 minutes of inactivity to conserve battery life.

Figure 3: The 1999 counts LCD display with automatic backlight.

4.2 Selecting Measurement Functions

Use the central rotary switch to select the desired measurement function and range:

• Resistance (Ω): Select the appropriate Ω range (e.g., 20Ω, 200Ω, 2kΩ, etc.).
• Capacitance (C): Select the appropriate C range (e.g., 2000pF, 20nF, 200nF, etc.).
• Inductance (L): Select the appropriate L range (e.g., 20mH, 200mH, 2H, 20H).
• Transistor hFE: Use the dedicated hFE test input jack.

4.3 Performing Measurements

1. Connect the test leads to the appropriate input jacks as described in Section 3.2.
2. Turn the rotary switch to the desired measurement function and range.
3. Touch the test probes to the component you wish to measure.
4. Read the value displayed on the LCD screen.
5. For Transistor hFE tests, insert the transistor leads into the corresponding slots in the hFE test input jack.

4.4 Data Hold Function

Press the blue HOLD button to freeze the current reading on the display. Press it again to release the hold function and resume live measurements.

5. Maintenance

5.1 Cleaning

Wipe the multimeter with a dry, soft cloth. Do not use abrasive cleaners or solvents.

5.2 Battery Replacement

When the low battery indicator appears on the display, replace the 9V battery as described in Section 3.1. Always use a fresh zinc-carbon battery.

5.3 Storage

When not in use for extended periods, remove the battery to prevent leakage. Store the multimeter in a cool, dry place away from direct sunlight and extreme temperatures.

6. Troubleshooting

• No display or dim display: Check battery level and replace if necessary. Ensure the power button is pressed.
• Incorrect readings: Verify that the test leads are correctly connected and that the rotary switch is set to the appropriate function and range. Ensure the component is properly connected to the probes.
• 'OL' or '1' displayed: This indicates an over-range condition. Select a higher range on the rotary switch or check for an open circuit.
• No continuity beep: Ensure the continuity function is selected and that the resistance is below 50Ω.

7. Specifications

Figure 4: Detailed specifications for Resistance and Transistor hFE.

Figure 5: Physical dimensions of the HP-39L Multimeter.

8. Warranty and Support

This product typically comes with a 1-year warranty from the store. For any issues or support, please contact the seller directly. They aim to answer all inquiries within 24 hours.

9. User Tips

• Always ensure the test leads are securely connected to prevent inaccurate readings or damage.
• When measuring unknown values, start with the highest range and gradually decrease it until a stable reading is obtained.
• Take advantage of the automatic backlight feature in dimly lit workspaces for better visibility.
• The wrist strap is useful for keeping the multimeter handy and preventing accidental drops, especially when working in elevated positions.