Control Summary
Under normal op
eration, the AC and DC COUPLING LEDs indicate the coupling
mode of the amplifier. If they a lternately flash after a degauss operation, this
indicates the amplifier is displaying an error code with the four status LEDs on
the lower-left front panel. (See page 45, Displaying Error Codes with the Probe
Degauss Autobalance Button.)
PROBE INPUT Connector
All current probes compatible with the TCPA300 and TCPA400 attach at the
PROBE INPUT connector, which is a multi-pin female connector. Information
about connecting a probe is a vailable. (See page 9, Connecting a Current Probe
to the Amplifier.)
OUTPUT Co
nnector
The amplifier current measurement output is acces sed at the OUTPUT connector,
which s hould be connected to the oscilloscope input. Attach one end of a 50 Ω
BNC cable to this connector and the other end to a 50 Ω vertical input of your
oscillo
scope. The output impedance of the amplifier is 50 Ω.
To get a direct readout of current on your Tektronix oscilloscope, use the
TEKPRO
BE interface cable to connect the amplifier to your oscilloscope.
NOTE. To obtain accurate measurements, the input impedance of your
oscilloscope must be 50 Ω. Make sure your amplifier OUTPUT is connected to an
oscilloscope input using a 50 Ω BNC cable, and that the oscilloscope i nput is set
to 50 Ω impedance. The proper cabling is shown. (See Figure 1 on page 1.)
If your oscilloscope does not have 50 Ω impedance settings for inputs, you can
place a 50 Ω feedthrough termination on the oscilloscope input and connect
the amplifier output cable to the termination. Do not place the feedthrough
ter
mination at the amplifier end of the BNC connecting cable.
Probe DC Gain Adjust
(l
ocated on probes)
After the PROBE DEGAUSS AUTOBALANCE routine has been run, the probe
a
nd amplifier system will meet al l published specifications. However, if you want
to improve the tolerance of the system accuracy, or to intentionally offset the
accuracy to make up for total system errors, you can manually adjust the gain of
the probe. See the service manual for adjustment procedures and locations.
NOTE. You should be careful to note the existing position of the DC Gain
Adjustment before you alter it, so that you may return it to the initial, calibrated
position. By altering the DC Gain Adjustment, you may cause the probe to not
meet the warranted DC Accuracy specification.
TCPA300/400 Amplifiers and TCP300A/400 Series Current Probes User Manual 21
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