Control Summary
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
2-5
All current probes compatible with the TCPA300 and TCPA400 attach at the
PROBE INPUT connector, which is a multi-pin female connector. For informa-
tion about connecting a probe, see Connecting a Current Probe to the Amplifier
on page 1--9.
The amplifier current measurement output is accessed at the OUTPUT connector,
which should 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
oscilloscope. The output impedance of the amplifier is 50 Ω.
To get a direct readout of current on your Tektronix oscilloscope, use the
TEKPROBE interface cable to connect the amplifier to your oscilloscope.
NOTE. To obtain accurate measurements, the input impedance of your oscillo-
scope 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 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 feedthrough termination on the oscilloscope input and connect the
amplifier output cable to the termination. Do not place the feedthrough
termination at the amplifier end of the BNC connecting cable.
After the PROBE DEGAUSS AUTOBALANCE routine has been run, the probe
and amplifier system will meet all 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. Refer to Figures 6--3 and 6--5 on pages 6--7 and 6--12 for the
adjustment 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.
For example, the typical accuracy of the TCP312 probe on the 1A/V range is
1%. If you want to measure a 3A p-p, 1kHz square wave and need increased
accuracy (better than 0.25% is attainable), first adjust the TCP312 on the 1A/V
range setting using a calibrated 3A p-p, 1kHz square wave source. Then, attach
the probe to your circuit and take your measurement. Remember, altering the DC
Gain Adjustment may cause the probe to not meet the warranted DC Accuracy
specification.
PROBE INPUT Connector
OUTPUT C onnector
Probe DC Gain Adjust
(located on probes)
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