Time Electronics

1024 DC Current Calibrator

Time Electronics Ltd, Unit 5, TON Business Park, 2-8 Morley Road, Tonbridge, Kent, TN9 1RA, United Kingdom

T: +44 (0) 1732 355993 | F: +44 (0) 1732 350198 | mail@timeelectronics.co.uk | www.timeelectronics.com

Description

A precision DC current source for calibration and test applications

from nanoamp levels to 100 mA. The 1024 is a solid state battery

powered instrument which is easily portable and convenient for

laboratory, field, or industrial use. It incorporates many of the

well-proven circuit techniques of the Time Electronics type 1010 DC

voltage calibrator.

The null balance system enables the 1024 to be used for making

accurate current measurement in addition to its basic function

as a calibrator. Operation is by backing the current source output

against the current to be measured, with the difference being

displayed on a sensitive centre zone null meter. At the null point, there

is no voltage drop across the 1024.

Stability and Temperature Coefficient

The 1024 employs a precision aged reference diode as a basic

reference source. Excellent zero stability is ensured by the use of a

high performance FET chopper amplifier system.

Precision metal film resistors with temperature coefficients of less than

10 ppm per °C are used to maintain the accuracy and stability of the

initial calibration.

Safety Terminals

The 1024 output connections are via safety terminals that are

compatible with 4 mm shrouded plugs, standard plugs, bare wires,

and spade terminals.

These terminals are specifically designed with safety features

including limited opening distance and a raised flange around the

metal connection surface. This ensures that the clearances are

sufficient to make the exposed metal parts touch-proof.

Features

• 0 to 100 mA in 5 ranges

• Accuracy 0.02 %

• 10 ppm/hr stability

• 30 ppm/°C temperature coefficient

• Up to 15 V output drive

• Battery or mains operation

• 12 hours typical use between charges

• Battery level indicator

• Optional carry case

Portable Operation

The 1024 can be powered from mains supply or by the internal

rechargeable battery pack. When the calibrator is plugged into the

mains supply the internal batteries will automatically start to recharge.

If unplugged from the mains during operation the internal batteries will

continue to power the instrument. Full charge allows 12 hours typical

use. An LED indicator on the front panel displays the battery condition.

Applications

Applications include calibration and testing of current sensitive

transducers; calibration and linearity tests on digital and electronic

current meters; and semiconductor parameter measurements, for

example diode conduction voltages at specified current levels.