Extech Instruments 48VFL Instruction Manual page 10

Symptom Probable
- Sensor break error
- Sensor not connected
- A/D converter damage
- Auto tune time out error
Keypad not
- Keypad is locked
functioning
- Keypad is defective
Process
- Improper setting of Pb, Ti, Td and
value
CT
unstable
- No heater power or fuse open
No heat or
- Output device defective or
output
incorrect output used
LEDs and
- No power to controller
display not
- SMPS failure
lighting up
Process
- Electromagnetic Interference
Value
(EMI) or Radio Frequency
changed
Interference (RFI)
abnormally
Entered
- EEPROM error
data lost
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- Replace sensor
- Check that the sensor is connected correctly
- Unit must be repaired or replaced
- Check for outside source of damage such as
transient voltage spikes
Set Pb, ti, td manually
- Set" "to an appropriate value
- Have unit repaired
- Start AT process to set Pb, Ti, Td automatically
- Set Pb, Ti, Td manually
- Check output wiring and fuse
- Replace output device
- Check power lines connection
- Replace or repair meter
- Suppress arcing contacts in system to eliminate high
voltage spike sources. Separate the sensors and the
controller wiring from "noisy" power lines. Ground
heaters
- Replace or repair meter
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Solution
48VFL & 96VFL v1.2 07/13