Tektronix TCP300A, User Manual

Page: 60 / 82

Troubleshooting and Error Codes
Troubleshooting and Error Codes
Possible problems that you may encounter when measuring current with the
TCPA300 and TCPA400 are available. (See Table 6.) Use this as a quick
troubleshooting reference.
Table 6: Troubleshooting
Problem Remedy
Ampli fi er will not power on Check that the ampli fi er is plugged into a working AC outlet.
Defective ampli fi er. Refer the instrument to quali fi ed service personnel for repair. To
help determine which module is defective, a troubleshooting section is available in the
service manual.
Front panel displays an error status.
Error Status LEDs are on the lower-left
section of the ampli
fi er front panel
Note the error status and correct the condition. The error status is labeled on the front
panel. For example, if the PROBE OPEN LED is lit, close and lock the probe jaws.
The AC and DC COUPLING LEDs are
fl ashing alternately
The Error Status LEDs are displaying an error code. Error codes descriptions are
available. (See Table 7 on page 46.) Note the error code and turn the instrument off, then
on. If the error condition persists, refer the instrument to quali
fi ed service personnel
for repair.
If the RANGE and DEGAUSS LED are both off, and one of the COUPLING LEDs is lit,
this indicates the ampli
fi er is not detecting a probe. Reconnect the probe.
All LEDs fl ashing indicate a thermal shutdown. Power-cycle the system and let it cool for
15 minutes before taking measurements. In most cases, 15 minutes is suf fi cient.
All LEDs are fl ashing All LEDs fl ashing indicates a thermal shutdown. Power-cycle the system and let it cool
before taking measurements. In most cases, 15 minutes is suf fi cient.
OVERLOAD LED remains lit red after
removing probe from circuit Probe transformer or ampli fi er main board is defective.
OVERLOAD LED remains lit orange Degauss the probe. If the OVERLOAD LED remains lit orange, disconnect the probe
from the circuit and let it cool for 15 minutes before degaussing again. If this does not
clear the LED, the probe transformer or probe Hall device may be defective. Connect
another probe to the ampli
fi er, or connect the probe in question to another ampli fi er.
Probe does not degauss successfully
and LEDs are lighted in an unfamiliar
pattern Ampli fi er is displaying an error code or is out of calibration or defective. (See Table 7 on
page 46.) If another ampli fi er is available, try to degauss the probe on the other ampli fi er,
to help isolate the cause.
Component failure on probe circuit board: broken adjustment/wire/etc. Disassemble
probe, repair/replace component or refer the instrument to quali
fi ed service personnel
for repair.
Cannot degauss the probe Current Probe is not locked. Lock the current probe.
Current Probe is improperly connected to the ampli
fi er input connector.
Ampli fi er 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 ampli fi er output.
Current Probe is defective or not compatible with the ampli fi er type.
42 TCPA300/400 Ampli fi ers and TCP300A/400 Series Current Probes User Manual