User Manual

Troubleshooting and Error Codes
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3-21
Table 3- 3: Troubleshooting (Cont.)
Problem Remedy
Measurements exhibi t excessive noise Current Probe is not locked. Lock the current probe.
Current Probe is improperly connected to the amplifier input.
Amplifier output is not terminated into 50 Ω load. Set input impedance of oscilloscope
to 50 Ω or connect a 50 Ω feed-through termination at the oscilloscope input, not at
the amplifier output.
Defective current probe transformer.
Measurement aberrations exceed the specified
limit
The amplif ier output is not terminated into 50 Ω load. Set the input i mpedance of the
oscilloscope to 50 Ω or connect a 50 Ω feedthrough termination (see the replaceable
parts l ist on page 8--6) 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. (For more information, see Current Limits on
page 3--4.) If possible, upgrade to a probe with a higher current rating or use a CT-4
transformer.
Excessive low f requency droop in pul se
response or low DC gain accuracy
Check that the probe slider is fully closed and locked.
Check and clean t he probe transformer and lid.
Degauss t he probe.
The amplifier or the oscilloscope may be AC coupled. Set the COUPLING to DC.
Measurements exhibi t excessive delay or
slowed pulse response
The amplif ier output is not terminated into 50 Ω load. Set the input i mpedance of the
oscilloscope to 50 Ω or connect a 50 Ω feedthrough termination (see the replaceable
parts l ist on page 8--6) 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 t o a probe wi th 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 mechani sm is dirty -- disassemble probe, clean and lubricate. Refer to the
probe disassem bly procedures on page 7--13.