MODEL PS03 MNX10010 / REV B Product Manual
Model PS03 utilizes three 2 mA current regulating JFET diodes to supply the sensor drive current to up to 3 sensors. The metering circuit draws only 25μA at mid-scale (its normal operating level). With this low current drain, the battery life, starting out with a fresh pair of alkaline batteries, will be about 80 hours. Figure 1 is a schematic diagram of one channel of Model PS03. The voltmeter normally monitors the sensor bias voltage which is nominally about +10 Volts DC. Consult the specification sheet for your particular sensor to verify the actual bias voltages since some sensors have various other bias voltages.
The ‘BATT TEST’ switch momentarily connects the meter directly across the battery terminals when depressed, to allow the user to check the actual battery voltage during operation. This procedure will not disturb the test in progress.
The dynamic signal from the sensor is superimposed upon the bias voltage and appears at the “Sensor’ jack. This signal is de-coupled from the DC bias by the 10μf coupling capacitor and connected to the ‘Output’ jack.
It can be seen, by examination of Figure. 1, that the dynamic signal may also be read by coupling to the ‘Sensor’ jack as well. However, if this is attempted, a means of dealing with the +10 Volt DC offset must be considered.
This type of connection can be useful when it is desirable to direct couple the readout to the sensor rather than to AC couple. More on this topic later.
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Datasheet |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2019/04/30 |
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REV B |
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MNX10010 |
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456 KB |
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