Operate the amplifier
6. The current pro
bes connect to the TCPA300 and TCPA400 at the PROBE
INPUT connector.
7. The COUPLING b
utton selects AC or DC probe coupling, as indicated by
the LEDs.
8. The RANGE bu
tton toggles between the two scale factors that are available
for the attached probe (TCPA300 only). LEDs indicate the selected range.
LED indicators
Indicators Function
PROBE OPEN
When lit, t
his LED indicates that the c urrent probe is unlocked. You
must have the probe slide locked to degauss the probe or to accurately
measure current.
CAUTION:
To reduce risk of fire when using bare conductors, ensure
that the probe slide is locked before you apply power to the circuit.
OVERLOAD When lit, this LED indicates different overload conditions. (See page 19,
Overload conditions .)
NOT
TERMIN
ATED
INTO 50 Ω
When lit, this LED indicates that the TEKPROBE Interface able or BNC
cable f
rom the OUTP UT of the amplifier is not connected to a 50 Ω input
on the oscilloscope. Switch the termination setting on the oscilloscope
to 50 Ω,orusea50Ω termination on the oscilloscope input.
NOTE. N
OT TER M INATED IN TO 50 Ω is only detected during the
DEGAUSS AUTOBALANCE operation.
NONCOMPATIBLE
PROBE TYPE
When l
it, this LED indicates that the probe that is connected to the
amplifier is not designed to work with the amplifier. TCP3XX probes
only w ork with the TCPA300 Amplifier, and the TCP404XL probe only
works
with the TCPA400 Amplifier.
18 Amplifiers and Current Probes Compliance and Safety Instructions
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