1. Introduction
The Geevorks PM1508 is a battery-powered digital insulation resistance tester designed for high precision, stability, and reliability. Equipped with a micro-processor chip, this device functions as a megohmmeter, multimeter, and voltmeter, offering auto-ranging capabilities and LED indication for various electrical measurements. It is suitable for a wide range of electrical DIY and professional applications.
2. Safety Information
WARNING: To avoid electrical shock, remove test leads before opening the case.
- Always ensure the device is in good working condition before use.
- Do not exceed the maximum input values for any measurement range.
- Use appropriate personal protective equipment (PPE) when working with electricity.
- Do not operate the device in wet conditions or explosive atmospheres.
- Refer to the full user manual (English) included in the package for detailed safety guidelines.
3. Package Contents
Verify that all items are present and undamaged upon unpacking:
- 1 x Geevorks PM1508 Insulation Resistance Tester
- 2 x Test Leads (Red and Black)
- 2 x Alligator Clips (Red and Black)
- 4 x AA Alkaline Batteries (IEC LR6)
- 1 x Storage Bag
- 1 x User Manual (English)
4. Product Overview
- LCD Display: Shows measurement readings, units, and function indicators.
- Function Buttons: COMP, ZERO, HOLD, TEST, PI/DAR, LOCK, Backlight.
- Rotary Switch: Used to select measurement modes and voltage ranges (OFF, 50V, 100V, 250V, 500V, 1000V, Hz, Vac, Vdc, Ω).
- Input Terminals: Insulated Input Positive (+), Insulated Input Negative (-), and Common Terminal (COM) for connecting test leads.
5. Setup
5.1 Battery Installation
The PM1508 requires 4 AA alkaline batteries (IEC LR6) for operation. To install or replace batteries:
- Ensure the device is turned OFF.
- Locate the battery compartment on the back of the device.
- Use a screwdriver to open the battery cover.
- Insert 4 AA alkaline batteries, observing the correct polarity (+/-) as indicated inside the compartment.
- Replace the battery cover and secure it with the screw.
5.2 Connecting Test Leads
Connect the red test lead to the positive (+) input terminal and the black test lead to the negative (-) input terminal. For common measurements, the black lead is connected to the COM terminal.
6. Operating Instructions
Turn the rotary switch to the desired measurement function. Press the 'TEST' button to initiate measurements in insulation resistance mode.
6.1 Function Button Overview
- COMP Function: In insulation resistance measurement mode, press 'COMP' to activate the comparison function. Select a comparison value (e.g., 100KΩ to 500MΩ). Press and hold to exit. In low resistance mode, press to toggle continuity beeping.
- ZERO Function: In continuity/low resistance mode, press 'ZERO' to enable/disable the zeroing function. This is effective only when short-circuit resistance is less than 2Ω.
- HOLD Function: In non-insulation test modes, press 'HOLD' to freeze the current reading on the display. Press again to exit. In insulation resistance test mode, HOLD is automatically activated after a single measurement.
- LOCK Function: Available only in insulation resistance measurement mode. Press 'LOCK' to toggle the function. When LOCK is ON, press 'TEST' to start/end the test.
- Polarization Index (PI)/Dielectric Absorption Ratio (DAR): In insulation resistance test mode, press this key before starting a measurement to enable PI/DAR. Select PI (10min:1min) or DAR (60s:15s or 60s:30s). After measurement, press to switch between insulation resistance ratio values.
- TEST Function: In insulation test mode, if LOCK is ON, press 'TEST' to start/end. If LOCK is OFF, press and hold 'TEST' to measure, release to end.
- Backlight Function: Press the backlight button to turn the LCD backlight ON/OFF. If not manually turned off, it will automatically turn off after 30 seconds.
7. Specifications
| Parameter | Value |
|---|---|
| Material | ABS |
| AC Voltage Measurement | 1.0~600.0V (50/60Hz), 0.1V, ±(1.5%+5) |
| DC Voltage Measurement | 0~±600.0V, 0.1V, ±(1.5%+5) |
| Frequency Measurement | 1~1KHz (voltage≥10V), 0.1Hz, ±(0.5%+3) |
| Low Resistance Measurement | 0.00~200Ω, 0.01Ω, ±(2%+5) |
| Insulation Resistance (50V) | 0.00~50.0MΩ (±1.5%+5), 50~500MΩ (±5%+5), 500M~1.0GΩ (±10%+5) |
| Insulation Resistance (100V) | 0.00~100.0MΩ (±1.5%+5), 100~500MΩ (±5%+5), 500M~5.0GΩ (±10%+5) |
| Insulation Resistance (250V) | 0.00~200MΩ (±1.5%+5), 200~1000MΩ (±5%+5), 1.0~5.0GΩ (±10%+5) |
| Insulation Resistance (500V) | 0.00~500MΩ (±1.5%+5), 500~1000MΩ (±5%+5), 1.0~10GΩ (±10%+5) |
| Insulation Resistance (1000V) | 0.00~2000MΩ (±1.5%+5), 2.0~10GΩ (±5%+5), 10~20GΩ (±10%+5), 20~100GΩ (±20%) |
| Battery | 4 * AA alkaline batteries (IEC LR6) |
| Operating Altitude | ≤2000m |
| Storage Altitude | ≤12000m |
| Operating Conditions | Temperature: 0℃~40℃ / Humidity: ≤85%RH (non-condensing) |
| Storage Conditions | Temperature: -20℃~60℃ / Humidity: ≤75%RH (non-condensing) |
| Temperature Coefficient | 0.1x(specified accuracy)/℃ when temperature <18℃ or >28℃ |
| Item Size | 190 * 100 * 55mm / 7.48 * 3.94 * 2.16in |
| Item Weight | 458g / 1.01lb |
| Package Size | 23.5 * 15 * 7cm / 9.25 * 5.91 * 2.76in |
| Package Weight | 815g / 1.79lb |
8. Maintenance
8.1 Cleaning
Wipe the device with a dry, soft cloth. Do not use abrasive cleaners or solvents. Ensure no moisture enters the device.
8.2 Storage
When not in use for extended periods, remove the batteries to prevent leakage. Store the device in its storage bag in a cool, dry place within the specified storage conditions.
8.3 Calibration
For professional use, periodic calibration by qualified personnel is recommended to maintain measurement accuracy.
9. Troubleshooting
- Device does not power on: Check battery installation and ensure batteries are not depleted. Replace if necessary.
- Inaccurate readings: Ensure test leads are properly connected and not damaged. Verify the correct measurement mode and range are selected. Check for environmental factors outside operating conditions.
- Display is dim: Activate the backlight function. If still dim, replace batteries.
- Continuity beeping not working: Ensure the ZERO function is enabled in low resistance mode and the resistance is below 2Ω.
10. User Tips
- For insulation resistance tests, always ensure the circuit under test is de-energized and safely discharged before connecting the tester.
- Utilize the HOLD function to easily record stable readings, especially in hard-to-reach areas.
- The backlight feature is particularly useful when working in dimly lit environments, improving readability of the LCD display.
- When performing low resistance measurements, remember to use the ZERO function to compensate for test lead resistance, ensuring more accurate results.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the contact details provided in the full user manual included with your product or contact your retailer. Keep your purchase receipt as proof of purchase.
