Typical Measurements; Testing Contactors (Starters); Testing Enclosed Relays - Egatronic 51261 Manual De Instrucciones

This section describes a variety of measurements often performed by technicians.
Reminder:
- User could select to turn on or off the backlight and laser whenever you are making readings
with the Thermometer. But if you are using USB to power up the Thermometer, the two levels
white colour backlight will be on automatically.
- Relatively high emissivity normally means emissivity setting of about 0.95.
- Relatively low emissivity normally means emissivity setting of about 0.30.
- When user cannot identify the emissivity of the object to be measured, user could cover the
surface to be measured (temperature >150ºC) with black electric tape (emissivity of about 0.95).
Allow time for the tape to reach the same temperature as the object to be measured. Measure
and record the temperature of the tape.
Target the Thermometer to the object to be measured, adjust the emissivity setting to make it as
the same temperature as the tape. At this time, the Thermometer emissivity setting is close to the
emissivity of the object to be measured, measurement could be started.

TESTING CONTACTORS (STARTERS)

1. Press SET to select emissivity. Press
or 0.7 mid level for darkened contacts.
2. Press MODE to select MAX.
3. Measure line and load side of one pole without releasing trigger.
4. A temperature difference between the line and load sides of a pole indicate increased resistance
of one point and a contactor may be failing.

TESTING ENCLOSED RELAYS

1. Press SET and then press
relatively high for plastic encased relays or for bakelite enclosed relays or insulated connectors.
2. Press MODE to select MAX.
3. Start to scan.
4. Measure the relay casing, looking for hot spots.
5. Measure electrical connections on relay terminals looking for hot spots.
TESTING FUSES AND BUSS CONNECCTIONS
1. Press SET and then press / to set emissivity to relatively high for paper covered fuse body or
insulated connections.
2. Press MODE to select MAX.
3. Scan the paper covered length of fuse.
4. Without releasing the trigger, scan each fuse.
Unequal temperatures between fuses may indicate voltage or amperage imbalance.
5. Press SET and then press
30

TYPICAL MEASUREMENTS

/ to select relatively low emissivity for bright contacts,
/ to set emissivity to relatively low for uninsulated connectors or
/ to set emissivity to relatively low, for metal fuses and caps and