The Model 4025D Tunable Multimeter is a frequency selective ammeter and voltmeter used to measure the magnitude and phase angles of signals produced by the Model 4024/4024B Injection Units.
The voltmeter part of the 4025D allows touch and step voltages to be measured easily and accurately, which is important for the safety of both the general public and utility personnel. The Model 4025D is designed for portable use in the field; powered via an internal rechargeable battery.
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The Model 4024B is a switch mode voltage source that is used with the Model 4023 Coupling Transformer to produce a high current low voltage or high voltage low current in an earth loop.
The current from the Model 4023 is coupled into the earth loop being investigated via a selectable multi-tap output. In most cases the operator will try to inject the maximum current into the earth loop being tested since that gives maximum signal for the Model 4025. For that reason the 4023 has tap settings for earth loop impedances from 0.5 OhmS to 40 OhmS which covers most test situations.
Talk to a power system engineer for a solution. (08) 8259 8100
The instrument is easy to use with a large rotary selector switch and one-press test button, both of which permit operation with gloved hands. Unlike some instruments, the design negates the need for a shorting link when making two pole measurements.
There are no hidden functions with the instrument: clearly labelled auxiliary controls are used to select the test frequency (94 Hz, 105 Hz, 111 Hz and 128 Hz), output voltage (50 V or 25 V where local standards apply) and to switch the backlight on or off.
Talk to a power system engineer for a solution. (08) 8259 8100