P6021 Tektronix, P6021 Datasheet - Page 17

• Manufacturer Part Number: P6021
• Description: Test Probes 60MHZ, 250A 5 FT, w/term
• Manufacturer: Tektronix

Specifications of P6021

• Color: Black
• Equipment Type: Test Probe Set
• Accessory Type: AC Current Probe
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC current measurements

Operator Information
Insertion Impedance
When you insert a conductor into the probe, you add impedance to the circuit
you are measuring. This additional impedance affects signals; this is particularly
important if you are measuring fast rise times. Figure 2 illustrates the equivalent
circuit with the additional impedance introduced by the P6021.
2.8 H
1.7 nH
.004 Ω
Figure 2: Insertion Impedance of the P6021
Minimizing Loading Effect
To minimize the loading effect of the probe, clamp it at the low or ground end of
a component lead when possible. This method also minimizes noise or stray
signal interference.
Increasing Probe
You can increase the current sensitivity of the probe by increasing the number of
Sensitivity
times a conductor passes through it. For example, if the conductor loops through
the probe twice (a two-turn primary winding), the secondary current is doubled.
For example, suppose you set the termination sensitivity to 2 mA/mV and the
oscilloscope vertical scale to 10 mV/division. Ordinarily, this would result in the
equivalent of 2 X 10, or 20 mA/division. However, if the conductor is looped
through the probe twice, the vertical scale is divided by two, resulting in the
equivalent of 10 mA/division.
Looping the conductor twice effectively doubles vertical sensitivity; however,
impedance from the probe winding is also reflected into the circuit being
measured. This impedance is proportional to the square of the number of loops.
This additional impedance affects signals; this impedance is particularly
important when you are measuring high-frequency current waveforms or
waveforms with fast rise times.
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P6021 Instruction Manual