SONAR TEST - RV and RVM Transducer Sense Resistor Test

Detailed guide for measuring resistance and test points in SONAR systems with single transducer and transducer pair.

This FAQ is part of our new series for troubleshooting SONAR systems. Here you will find detailed guides for investigating and solving common problems with SONAR, including interference and settings. Whether you use an RV, RVM, or AIRMAR CHIRP SONAR system, we offer step-by-step instructions to ensure optimal performance. Do you need help with installation or testing? Then this is the right place.

PART 1 – SONAR ERROR: No transducer connected – investigation guide
PART 2 – Introduction to SONAR Interference
PART 3 – SONAR Interference Investigation – Manual Setting
PART 4 – SONAR SETTING & TEST: When SONAR is not affected by interference
PART 5 – SONAR SETTING & TEST: When SONAR is affected by interference
PART 6 – RV and RVM Transducer Sense Resistor Test

Measurement in systems with single transducer

1. Set your multimeter to KΩ (KOhm).
2. Disconnect the transducer from any extension cables and measure the resistance on the pins of the transducer's connector (Test Point 1).
3. Connect the extension cable to the transducer and measure the resistance on the pins at the end connector (Test Point 2).

See test points for single transducer below:

Measurement in systems with transducer pair

1. Set your multimeter to KΩ (KOhm).
2. Disconnect the transducers from Y-split cables or extension cables and measure the resistance on the pins of each transducer's connector (Test Point 1 & 2).
3. Connect the transducers to the Y-split cable and measure the resistance at the Y-split cable's connector (Test Point 3).
4. Connect the extension cable to the Y-split cable and measure the resistance at the end connector (Test Point 4).

See test points for transducer pair below:

See which pins to connect the multimeter to to get the resistance values (applies to both single transducer and transducer pair):

After testing – Contact Raymarine Support

Once you have completed testing and taken the resistance values, contact Raymarine Product Support and provide the following information:

Single transducer:

• Multifunction display part number or exact type
• Software version for the multifunction display
• Transducer part number
• Test Point 1 resistance (EXACT value)
• Test Point 2 resistance (EXACT value)

Transducer pair:

• Multifunction display part number or exact type
• Software version for the multifunction display
• Transducer part number
• Test Point 1 resistance (EXACT value – starboard transducer)
• Test Point 2 resistance (EXACT value – port transducer)
• Test Point 3 resistance (EXACT value – Y-split cable)
• Test Point 4 resistance (EXACT value – extension cable)

Important: Do not round your measured resistance values up or down – state the exact values.