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Chapter 2
Operation
2.1 Environment and Handling
Calibration Exciter Type 4294 is designed for use in environments at temperatures within the
range –10 to +55°C (+14 to +131°F) and with relative humidity up to 90% RH (30°C (86°F),
non-condensing). Whenever possible, the exciter should be used in its leather case (see
Fig.1.1) to protect it from mechanical damage and contamination from grease or dirt.
2.2 Battery Installation and Replacement
For powering Type 4294, a long-life alkaline battery QB-0016 (IEC Type 6LR61) is
recommended. The battery fits into the battery holder, which is accessible after unscrewing the
base of the calibrator (see Fig.2.1). To prevent damage, take care not to cross the screw thread
on reassembly.
To maximise battery life, Type 4294 automatically switches off after approximately 100 s.
Using Battery QB-0016, approximately 200 calibrations, each of approximately 100 s, are
possible. After this, the operating period rapidly decreases, indicating that the battery needs to
be replaced. However, the exciter can be used until its battery is fully depleted without
influencing the accuracy of the reference level generated.
Fig.2.1 9 V battery installed in the calibrator
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