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This document is a technical manual for the IDEAL INDUSTRIES, INC. models 61-480, 61-481, and 61-482. It provides comprehensive service information for these devices, including precautions, safety guidelines, specifications, basic maintenance procedures, performance tests, and calibration instructions. The manual is intended for qualified personnel to ensure safe and effective servicing of the meters.
The devices are designed for various electrical measurements, offering a range of functions to assist in troubleshooting and verification tasks. They feature an LCD display, with the 61-480 model having a 3¾ LCD display and the 61-481 and 61-482 models featuring a 3¾ LCD display with an 82-segment bargraph. The display count varies between 3200 for the 61-480 and 4000 for the 61-481 and 61-482, providing detailed readings. The numeric update rate is 2 times per second for all models, while the bargraph on the 61-481 and 61-482 updates 12 times per second, offering a dynamic visual representation of measurements.
A key feature across all models is the automatic polarity display, which simplifies usage by eliminating the need to manually account for positive or negative readings. An "OL" (Over Range) display indicates when a measurement exceeds the device's specified range, preventing misinterpretation of data. For user convenience and battery conservation, the meters include an automatic power-off feature with a backlit display that turns off after one minute of inactivity. A low voltage indicator, denoted by a battery symbol, alerts users when the battery needs replacement, ensuring continuous operation.
The meters are designed with robust input protection to safeguard against electrical overloads. They can handle maximum input voltages of 1000V (750V AC) CAT II between V and COM terminals, and between any terminal and earth ground. Current inputs are protected by fast-blow fuses: 1A (500V) for the mA connector and 16A (500V) for the A connector, ensuring safety during current measurements. The devices are rated for IEC Over-voltage Category III, indicating their suitability for use in distribution level mains and fixed installations.
The 61-481 and 61-482 models offer additional functionalities, such as capacitance measurement, which allows users to test capacitors within a range of 4nF to 40mF. These models also include frequency measurement capabilities, with ranges extending up to 40MHz for the 61-481 and 61-482, and up to 30MHz for the 61-480. The 61-482 model further enhances its utility with temperature measurement, supporting both Celsius and Fahrenheit scales, and a peak hold function for capturing transient maximum or minimum values in DCV, ACV, DCA, and ACA modes.
For basic maintenance, the manual provides clear instructions for replacing the battery and fuses. The 61-480 model is powered by two 1.5V AAA dry cell batteries, offering a typical battery life of 500 hours (alkaline). The 61-481 and 61-482 models use a single 9V dry cell battery, with a typical battery life of 300 hours (alkaline). The process involves disconnecting test leads, turning off the meter, removing the battery cover screw, and then replacing the battery. Fuse replacement is also detailed, emphasizing the importance of using only quick-acting fuses with specific Amp/Volt current interrupt ratings to prevent damage or injury. The manual also includes instructions for cleaning the meter's housing, advising against the use of water or solvents to prevent damage.
Performance tests are outlined to verify the meter's operability and accuracy against its specifications. These tests cover various functions, including display, voltage (DC and AC), current (DC and AC), resistance, diode, continuity, frequency, capacitance, and temperature. Calibration procedures are provided to ensure the meter performs according to specifications, recommending annual calibration at an ambient temperature of 23°C ±2°C and relative humidity of 75% or less. These procedures involve adjusting potentiometers (VR1, VR2, VR3, VR4, VR5, and VC1) using a calibrator to achieve accurate readings across different functions and ranges.
The physical characteristics of the meters include dimensions of 183mm x 85mm x 33mm, with a weight of 0.4Kg (with battery). When equipped with a holster, the dimensions increase to 202mm x 95mm x 46mm, and the weight becomes 0.6Kg. The devices are designed for indoor use and have an IP64 rating for dust and water protection, making them suitable for various working environments. They are built to withstand vibration and shock, meeting MIL-T-28800E TYPE II Class 5 standards. The environmental characteristics specify an operating temperature range of 0 to +50°C and a non-operating range of -20 to +60°C, with operating humidity below 80% R.H. The meters can operate at altitudes up to 2,222 meters (7290 ft.) and be stored at altitudes up to 12,300 meters (40354 ft.).
General| Category | Measuring Instruments |
|---|---|
| Model | 61-480 |
| Brand | IDEAL |
| Type | Digital Multimeter |
| Voltage Range | 600V AC/DC |
| Current Range | 10A AC/DC |
| Resistance Range | 40 MΩ |
| Continuity | Yes |
| Diode Test | Yes |
| Display | LCD |
| Safety Rating | CAT III 600V |
| Capacitance Range | 100μF |
| Frequency Range | 10 MHz |
