The instrument will automatically detect and configure according to the sensor connected
to the probe or extension cable. Using the wrong sensor for the ignition system under
measurement may lead to erroneous readings, or no readings at all.
7.1 Flexible probe and sensor setup (GTC505 and GTC505m)
This instrument is supplied with a flexible probe, and two types of sensors:
• Flexible probe: equipped with a BNC connector at one end and a barrel connector at the other.
• COP sensor: for measuring coil on plug and coil near plug ignition systems.
• SPW sensor: for all ignition systems which use high voltage wires (spark plug wires) to
connect the ignition coil or distributor to the spark plug.
COP sensor
SPW sensor
Flexible probe
Fig.10 - Sensors connection to flexible probe
1- Connect the probe to the instrument using their BNC connectors.
2- Insert and firmly press the appropriate COP or SPW sensor into the barrel connector
of the probe.
7.2 Extension cable and sensor setup (GTC505m only)
The GTC505m is also supplied with a extension cable and clip-on spark plug wire sensor
to allow for remote measurements:
• Extension cable: 78” (2 m) equipped with a BNC connector at one end and a barrel
connector at the other. This extension cable can be used with COP, SPW and the clip-on
SPW sensor.
• Clip-on SPW sensor: for all ignition systems which use high voltage wires (spark plug
wires) to connect the ignition coil or distributor to the spark plug.
Fig.11 - Sensors connection to extension cable
1- Connect the extension cable to the instrument using their BNC connectors.
2- Insert and firmly press the appropriate COP or clip-on SPW sensor into the barrel
connector of the extension cable.
7.3 Measuring coil on plug and coil near plug ignition systems
1- Ensure the instrument is turned off.
2- Insert the COP sensor barrel connector plug into the flexible probe receptacle, removing
the SPW sensor if necessary.
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COP sensor
Clip-on SPW sensor
Extension cable
