Control Summary
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
2-3
Displaying Error Codes w ith the Probe Degauss Autobalance Button on
page 3--22.
NOTE. The NOT TERMINATED INTO 50 Ω LED is on when the amplifier output
is not properly terminated into a 50 Ω load. Make sure your amplifier OUTPUT
is connected to an oscilloscope input using a 50 Ω BNC cable, and that the
oscilloscope input is set to 50 Ω impedance. See Figure 1--1 on page 1--1 for
proper cabling.
If your oscilloscope does not have 50 Ω impedance settings for inputs, you can
place a 50 Ω feed-through termination on the oscilloscope input and connect the
amplifier output cable to the termination. Do not place the feed-through
termination at the amplifier end of the BNC connecting cable.
The MANUAL BALANCE buttons allow you to fine-adjust the DC offset that
appears at the amplifier OUTPUT connector. The manual balance adjustment
only functions when the amplifier is set to DC coupling, and the MANUAL
BALANCE indicator is only lighted after you press one of the M ANUAL
BALANCE buttons in DC coupling mode.
When lit, this indicator informs you that the current probe is unlocked. You must
have the probe slide locked to degauss the probe or to accurately measure
current.
When this LED is red, it informs you that the measurement you are taking
exceeds the continuous amplitude limit of the TCPA300 and TCPA400. The
detection circuits detect only low frequency and DC overloads. Since overloads
can magnetize the probe, always degauss the probe after an overload. When the
OVERLOAD indicator flashes red, it indicates the pulsed waveform is exceeding
the amplitude limit of the amplifier.
When this LED is orange, it indicates that the safe operating temperature of the
probe, and possibly the amplifier, has been exceeded. Disconnect the probe from
the current source and allow time for the probe head and amplifier to cool.
When this LED blinks red and orange, it indicates that both the safe operating
temperature of the probe and the current limit have been exceeded.
WARNING. To avoid personal injury or equipment damage, do not exceed the
specified electrical limits of the TCPA300 and TCPA400 or any applicable
accessories.
MANUAL BALANCE
Buttons and Indicator
PROBE OPEN Indicator
OVERLOAD Indicator
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