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Wilcoxon 731A Operating Manual

Seismic accelerometer and power unit/amplifier
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731A seismic accelerometer and
P31 power unit/amplifier
Operating guide
Caution: This manual should be read carefully before installation.
Wilcoxon Sensing Technologies
Tel: +1 (301) 330-8811
20511 Seneca Meadows Parkway, Germantown MD 20876, USA
Tel: +1 800 WILCOXON
Fax: +1 (301) 330-8873
Amphenol (Maryland) Inc. d/b/a Wilcoxon Sensing Technologies
www.wilcoxon.com

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Summary of Contents for Wilcoxon 731A

  • Page 1 Caution: This manual should be read carefully before installation. Wilcoxon Sensing Technologies Tel: +1 (301) 330-8811 20511 Seneca Meadows Parkway, Germantown MD 20876, USA Tel: +1 800 WILCOXON Fax: +1 (301) 330-8873 Amphenol (Maryland) Inc. d/b/a Wilcoxon Sensing Technologies www.wilcoxon.com...

  • Page 2: Table Of Contents

    Contents 1.0 Introduction…………………………………………………………………..3 2.0 Description………………………………………………………………… ..3 2.1 731A seismic accelerometer………………………………………….3 2.2 P31 power unit/amplifier………………………………………………3 2.2.1 P31 options…………………………………………………..4 3.0 Operation……………………………………………………………………..4 3.1 Inspection…………………………………………………………….. .4 3.2 Preparation for use…………………………………………………..4 3.3 Measurement use……………………………………………………..4 3.4 Precautions in use…………………………………………………….5 3.5 Alternate power supply………...……………………………………..5 4.0 Maintenance and troubleshooting……………………………………….5 4.1 Battery replacement…………………………………………………...6...

  • Page 3: Introduction

    The 731A accelerometer is relatively small and comes in a case for safe transport. Due to its extremely high sensitivity, the 731A is fragile. Do not drop it! Protect the unit at all times from accidental impacts. Handling vibration and shock must not exceed 15 g peak.

  • Page 4: P31 Options

    Retain the shipping container and packing material for use in case reshipment is required. Caution: Use great care in handling the 731A. It is fragile. Never DROP it or hit it against a solid object.

  • Page 5: Measurement Use

    DC voltage. The time constant of the capacitor-resistor combination must be large enough not to degrade the capability of the 731A accelerometer (-3 dB at 0.05 Hz). For example, using a 100 mF capacitor and 500 K resistor results in a time constant of 50 seconds (.02 Hz).

  • Page 6: Maintenance And Troubleshooting

    0.5g. Excessive vibration or shock may cause the amplifier to go into an overload condition. After the 731A amplifier has overloaded due to excessive vibration or shock, there will be no signal output until the amplifier recovers.

  • Page 7: Technical Assistance

    If the 731A appears to malfunction, one should measure the DC level (bias output voltage) at the output of the accelerometer (e.g. input of the P31) using a portable vibration monitor. Note that the turn on time is about two minutes. With no significant vibration input, the DC level should be about +9 VDC.

This manual is also suitable for:

P31

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