TCP305 and TCP312 Performance Verification
Table 16: Bandw
idth test for the TCP305 and TCP312
Oscilloscope vertical gain TCPA300 output
Probe Range
w/TEKPROBE
cable
w/BNC
cable
w/TEKPROBE
cable
w/BNC
cable
M1
@3 MHz
ref freq
BW
freq
M2
@warranted
BW freq Calculation
1
TCP305 5 A/V 10 mA/div 2 mV/div
~60mAp-p ~12mVp-p 50MHz
TCP312 1 A/V 10 mA/div 10 mV/div
~60mAp-p ~60mVp-p 100MHz
1
Use the formulas shown in step 9.
7. Set the osc
illoscope time base to 4 or 5 ns/division. Increase the signal
generator frequency to the warranted bandwidth.
8. Using the
peak-peak measurement capability of the oscilloscope, measure and
record the peak-peak reading as M
2
.
9. The probe
meets the bandwidth specification if the ratio of the signal
amplitude at the warranted bandwidth is at least 70.7% of the signal amplitude
at 3 MHz. Using the following calculation, verify probe bandwidth for the
TCP305:
NOTE. The impedance of the HF current loop used in this test changes between
3MHzand100
MHz. Typically the impedance changes from 50 Ω at 3 MHz to
59 Ω at 100 MHz. Thus you can substitute the following equation to make this test
more accurate for the TCP312:
This completes the performance verification for the TCP305 and TCP312 probes.
If the TCP305 and TCP312 probes fail any of the verification tests, refer to the
Adjustments section for servicing information.
28 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual
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