Troubleshooting and Error Codes
Table 5: Troubleshooting (cont.)
Problem Remedy
Measurement aberrations exceed the
specified limit
The amplifier output is not terminated into 50 Ω load. Set the input impedance of the
oscilloscope to 50 Ω or connect a 50 Ω feedthrough termination at the oscilloscope input.
Do not attach the termination to amplifier output.
The measurement exceeds the maximum continuous current or Ampere-second product
ratings of the Current Probe. (Current limits are available) (See page 25, Maximum
Current Limits.) If possible, upgrade to a probe with a higher current rating or use a
CT-4 transformer.
Excessive low frequency droop in pulse
response or low DC gain accuracy
Check that the probe slider is fully closed and locked.
Check and clean the probe transformer and lid.
Degauss the probe.
The amplifier or the oscilloscope may be AC coupled. Set the COUPLING to DC.
Measurements exhibit excessive delay
or slowed pulse response
The amplifier output is not terminated into 50 Ω load. Set the input impedance of the
oscilloscope to 50 Ω or connect a 50 Ω feedthrough termination at the oscilloscope input.
Do not attach the termination to the amplifier output.
The measurement exceeds the Ampere-second product of the Current Probe. If possible,
upgrade to a probe with a higher current rating or use a CT-4 transformer.
The oscilloscope bandwidth limit is turned on. Verify that the bandwidth limit switch on
the oscilloscope is set to the desired bandwidth position.
Probe jaw not opening and closing freely
The jaw mechanism is dirty - disassemble pr obe, clean and lubricate. Probe disassembly
procedures are available. (See the service manual.)
42 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes User Manual
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