Troubleshooting and Error Codes
3-20
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Table 3- 3: Troubleshooting (Cont.)
Problem Remedy
Degauss takes longer than 10 seconds Probe is attached to an energized circuit. Disconnect probe from circuit and retry.
Probe is fault y -- Probe transformer (defective Hall device with excessive noise or drift)
may cause thi s sympt om. M ay also be caused by a shorted or open wire in the probe
cable assembly.
Defective main board -- If the probe is not the cause, then it is most likely a defective
main board in the amplifier.
Cannot make a current measurement -- no
measurement output from amplifier
Current Probe is not locked. Lock the current probe.
Current Probe is improperly connected to the amplifier input connector.
Amplifier COUPLING i s set to AC. Set the COUPLING to DC.
A Degauss/Autobalance routine has not been completed successfully on the system.
Degauss t he probe.
Oscilloscope/Amplifier is not set to an appropriate sensitivity setting.
Defective interface cable (between oscilloscope and amplifier).
MANUAL BALANCE will not adjust Oscilloscope or amplifier input coupling not set to DC. MANUAL BALANCE buttons
only functi on when t he amplifier is i n the DC coupling mode.
Oscilloscope/Amplifier is not set to an appropriate sensitivity setting.
Stray DC component in measurement Degauss the probe using the PROBE DEGAUSS AUTOBALANCE button. (The
Current Probe has been overloaded, dropped, or exposed to magnetic field.)
You can use the MANUAL BALANCE buttons to null out any residual DC offset af ter per-
forming a Probe Degauss Autobalance routine.
Measurements are inaccurate Degauss t he probe.
The amplif ier output is not terminated into 50 Ω load. Set the input i mpedance of
oscilloscope to 50 Ω or connect a 50 Ω feedthrough termination at the oscilloscope
input. Do not attach the termination at the amplifier output.
The measurement exceeds the maximum continuous current or Ampere-second
product ratings of the Current Probe. If possible, upgrade to a probe with a higher
current rating or use a CT-4 transformer.
Amplifier or current probe out of calibration. Refer to Performance Verification on
page 5--1.
The jaw mechani sm is dirty -- disassemble probe, clean and lubricate. Refer to the
probe disassem bly procedures on page 7--13.
Defective current probe transformer.
Measurements roll off at high frequencies The oscilloscope bandwidth limit is turned on. Verify that the bandwidth limit switch on
the oscilloscope is set to the desired bandwidth position.
(Be careful not to exceed the frequency limit of the probe used. Frequencies above
the probe design may cause overheating and damage to the probe.)
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