Macha Phone Scan

• Tests phones in the field
• Finds all common geophone problems – EVEN STICKY PHONES
• No operator interpretation required. Fast, accurate, read-at-a-glance bar graph display.
• Easy setup in the field – does not require special components from the factory. description & application

The Phone Scan Four allows a cable crew to find 99% of all geophone problems that normally occur on the line.

Four tests are provided; an active AC impedance measurement, a noise measurement, a leakage measurement and a polarity test. The active AC impedance measurement performed at the natural frequency of the geophone string detects damping, coil freedom, resistance (continuity) and natural frequency problems.

Subtle problems such as sticky phones that other geophone testers cannot detect are easily found. In the case of horizontal or 3- component phones, coil freedom is a particularly important parameter because a small amount of case tilt will lock the coil of a horizontal phone. When a crew is using these phones, it becomes important to test the plant as well as the geophone. Simple continuity tests will not find locked coils – the AC impedance measurement provided by the PHONE SCAN will find the problem.

The PHONE SCAN is a rugged, lightweight, water-tight unit supplied with a leather carrying case and shoulder strap. It was designed to be carried by the crew so they can find a problem while still at the station. The PHONE SCAN frees the recording truck from looking for bad, noisy or leaky strings and prevents finding bad phones by seeing dead traces on the recorder.

Each PHONE Scan can be supplied with a user specified connector panel to match the geophone take-out or a Mueller top panel.