DO4A
Technical Specifications
This portable Digital Ohmmeter is a practical instrument for low resistance measurement, ideal for use in the workshop, field or test facilities. It is of rugged construction contained in an aluminium case with tilt handle. The DO4A has many advanced features, including protection up to 415 volts rms, digital calibration and long scale length, 4000 count.
LS06 Standard Lead Set supplied with DO4A
The test leads provided have a length of 1 metre with spade tags for connection to the ohmmeter terminals. They are terminated in combined current and potential probes that will accept conductor diameters up to 6mm.
The rechargeable sealed lead acid battery means real portability with more than 14 hours continuous operation, without the problems normally associated with other battery types. Full measurement capability is maintained whilst charging.
For ease of operation the control functions have been kept to a minimum and are clearly marked. It is of course direct reading, warning LEDs illuminate when an open circuit lead condition is detected. Over range and low battery indication is also provided.
The DO4A is supplied ready for immediate use with battery, mains cord and measuring leads, no extras are normally necessary. The 15mm LCD provides easy viewing and the instrument can be used in any position for many and varied applications.
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| Measurement | 4 Terminal Kelvin/Thomson principle eliminates error due to lead resistance. Open circuit measurement voltage approx. 5V dc. |
| Display | 15mm LCD 4000 count with automatic decimal point and polarity indication. |
| Ranges | 6 Push button selected with LED indication. |
| Auto Zero | Permits the automatic zero of amplifiers and external circuits eliminating errors due to thermal emf. |
| Calibration | Digital, security key protected. |
| Protection | 415 rms maximum at input terminals. |
| Battery | 6 Volt 2.8 Ah sealed lead acid, replaceable. Operating Time: 14 hours typical on bottom range, 28 hours typical on other ranges. Internal charger with automatic switch-off to prevent deep discharge. |
| Executive Lead Pack | This lead pack consists of four test leads, 1 metre long, with 4mm banana plugs, 4 crocodile clips, 4 test prods and 2 Kelvin Clips (combined current and potential clips). |
| Terminals | 4mm binding posts accept spade tags and 4mm banana plugs. |
| Terminals | 4mm safety sockets |
| Working Temp | 0...40°C rel. humidity 80% max. non-condensing. |
| Storage Temp | -20 ... +50°C. |
| Mains Supply | 100/120/220/240 Volts +10% -13%. 47 ... 63Hz. 20VA |
| Safety | IEC 348 Protective Class 1. |
| Dimensions | 215 x 250 x 88 mm (W D H): 1/2 19" rack. 2U high (467 x 374 x 216 mm packed in card carton). |
| Mass | 3.5kg (4.5kg packed in card carton). |
| Accessories | Supplied complete with mains cord, measuring leads with Kelvin Clips, handbook, and certificate of conformity. |
Resistance Ranges
| Range | Resolution | Typical Current | Uncertainly @ 20°C ±5°C, 1 year | Temperature Coefficient / °C |
| 4 kohm | 1 ohm | 100 µA | ±(0.05% Rdg + 0.02% FS) | 30 ppm Rdg + 1 ppm FS |
| 400 ohm | 100 mohm | 1 mA | ±(0.05% Rdg + 0.02% FS) | 30 ppm Rdg + 1 ppm FS |
| 40 ohm | 10 mohm | 10 mA | ±(0.05% Rdg + 0.02% FS) | 30 ppm Rdg + 1 ppm FS |
| 4 ohm | 1 mohm | 10 mA | ±(0.05% Rdg + 0.03% FS) | 30 ppm Rdg + 4 ppm FS |
| 400 mohm | 100 µohm | 10 mA | ±(0.05% Rdg + 0.05% FS) | 30 ppm Rdg + 25 ppm FS |
| 40 mohm | 10 µohm | 100 mA | ±(0.05% Rdg + 0.05% FS) | 30 ppm Rdg + 25 ppm FS |
