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Types of probes (continued)

Single-ended active probes

Active probes contain a small,

active amplifier built into the

probe body near the probe tip.

This arrangement makes it

possible to keep the probe input

capacitance very low, usually less

than 2 pF. This low capacitance

results in high input impedance

on high frequencies. It has the best

overall combination of resistive

and capacitive loading. With such

low loading, active probes can be

used on high-impedance circuits

that would be seriously loaded

by passive probes. Active probes

are the least intrusive of all

the probes.

Single-ended active probe characteristics

Model Attenuation Probe bandwidth Input dynamic range Applications and use Oscilloscope compatibility

1144A 10:1 800 MHz 0 to ±7 V Requires 1142A power supply 50 Ω BNC input

1145A 10:1 750 MHz, 0 to ±6 V • Probing surface-mount 50 Ω BNC input

2 channels devices

• Requires 1142A

power supply

1155A

10:1 750 MHz, 0 to ±6 V Probing surface-mount 50 Ω AutoProbe

2 channels devices

interface input

1156A 10:1 1.5 GHz 5 V p-p Measuring fast transitions 50 Ω AutoProbe

on low-voltage signals interface input

1157A 10:1 2.5 GHz 5 V p-p

1158A 10:1 4 GHz 5 V p-p

1 See pages 9 and 10 for available SMT probing solutions

2 Not compatible with 5000, 6000 or 7000 Series

Single-ended active probe advantages Limitations

Timing and voltage measurements are Active probes are more expensive than general-purpose passive probes.

more accurate at high bandwidths.

Active probes are the least intrusive to Active probes have lower dynamic range, lower maximum voltage and are less

circuits under test. rugged than passive probes.

1144A 800 MHz active probe

1145A 750 MHz low-mass active probe

1156A/57A/58A 1.5/2.5/4 GHz

active probe

1 2 3 4 5 6 7 8 9 10 11 12

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