Introduction - Time Electronics 1018 Technical Manual

1. Introduction

A high performance portable D.C. calibrator with a null measuring capability. It is suitable for use
in the field or laboratory for calibrating and testing a wide range of transducers e.g. thermo-
couples, 4-20mA and 0-10V transmitters, and PRTs. The 1018 has the following features,
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D.C. Volts
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D.C. Current 100 nA to 100 mA
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Resistance
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0.005% (50ppm) accuracy
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1 ppm setting resolution
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Stability <5ppm/day, <25ppm/yr
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Noise < 1ppm (0.1 to 1 Hz)
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Deviation 0 to +/- 0.999%
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Null Indicator 1 uV resolution at max sensitivity
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Null Readout 0 to +/- 1V fsd
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Zero and Sensitivity Controls
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Mains/Battery operation
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Portable 29 x 11 x 25 cm 2.4 Kg
Ranges
5 DC voltage ranges from 10mV to 100V each with a 6 digit (1ppm) resolution.
range 100mA with a 100nA (1ppm) resolution. Resistance from 0.01ohm to 10Kohm is available
in 0.01ohm steps.
Power
Either mains or re-chargeable battery. Battery operation enables good performance where earth
loop and noise pick-up occurs.
Stability v Temperature and Time
Outstanding performance is due to the use of special computer selected reference diodes and the
latest in resistor technology. The special low-thermal emf terminals reduce errors when working
with micro-volt signals.
Digital Deviation Control
Allows the output to be increased or decreased in % terms from 0 to +/-0.999%. This can be
used to provide a direct read-out of error against a nominal value e.g. 1.80000V with a +0.030
deviation would indicated a 0.03% error. This simplifies the recording of results for calibration
certificates and immediately shows if the unit being calibrated is within specification.
Null Measure
This function enables the 1018 to be used as a high performance differential voltmeter to resolve
differences as small as 1 micro-volt. An edgewise meter on the front panel indicates the null
signal(difference), and zero and sensitivity adjust controls are provided for adjustment. A rear
panel output of the null voltage signal is provided for driving chart recorders or data loggers. It is
suitable long term analysis and stability checking work. Pre-setting the sensitivity control provides
a known null sensitivity e.g. 10 ppm/div on a chart recorder.
100 nV to 100 V
10 milliohm to 10 Kohm
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