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Probe Selection Chart
------- Probe type
Direct
Isolation
High voltage (resistive)
High voltage (capacitive)
Low capacitance
Rectifier
Demodulator
Signal tracer
Hum-field tracing
Signal injector
Clip-on
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Used with
oscilloscope
oscilloscope
vtvm vtvm vom oscilloscope oscilloscope vtvm oscilloscope signal tracer signal tracer equipment under test oscilloscope vtvm
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Purpose
Use in low-impedance, low-frequency circuits (such as B+) where added capacitance of shielded cable is of no consequence.
Isolates measuring instrument from circuit under test. Series resistance and cable capacitance act as low-pass filter to sharpen pips on response curves.
Extends high-voltage range of vtvm and vom to allow measurements of voltages to 50kv.
Permits oscilloscope observation of high voltage pulses and waveshapes in tv horizontal sweep and high-voltage circuits.
For testing in high-impedance, wide-band, high-frequency (to several Mhz) circuits, such as video, sync and sweep circuits, with minimum amount of circuit loading.
Rectifies and filters r-f signals (to several 100 Mhz) and provides a doc output proportional to the peak or peak-to-peak value.
For visual signal tracing in r-f, video, and sound i-f stage and for displaying i-f and video amplifier response curves.
To reduce circuit loading and detuning effect during signal tracing.
Used to explore interfering hum fields.
Permits rapid checking of a-f, i-f and r-f circuits by injecting a broad-band signal.
Probe is clipped around current-carrying conductor which permits current measurement without breaking into the circuit.