Agilent Technologies N1022A Manuel d'utilisateur télécharger pdf (Page 9)

High-Frequency Voltage Probes Overview

Active voltage probes contain an

active component, usually a field-

effect transistor (FET), and there-

fore need to be powered. A FET

input has the advantage of pro-

viding a very low input capaci-

tance, typically from less than

1 pF to a few pF. This low capaci-

tance results in a high input

impedance on frequencies up to

7 GHz. With such low loading,

active probes can be used on

high-impedance circuits that

would be seriously loaded by

passive probes.

New InfiniiMax probe family.

The innovative InfiniiMax probe

system provides either differential-

or single-ended probing solutions

for the most demanding connec-

tion requirements, without sacri-

ficing performance.

Figure 3.1. Agilent 1130A/31A/32A/34A

InfiniiMax high-performance active probe.

Figure 3.2. Agilent 1156A/57A/58A

active probes for signals up to 4 GHz.

Model Probe Type Applications and Use Page

1130A/31A/32A/34A Active Diff/SE Measure both differential and single-ended signals up to 7 GHz 10

1155A Active Single-Ended Measure fast transitions on low-voltage signals, 2 channels 16

1156A/57A/58A Active Single-Ended Measure fast transitions on low-voltage signals up to 4 GHz 18

1163A Resistive divider Measure fast transitions on a wide range of signal voltages 4

54006A Resistive divider Low-cost alternative for high-frequency probing 21

High-Frequency Probe Advantages Limitations

Timing and voltage measurements more accurate at Active probes are more expensive than general purpose passive probes

high bandwidths

Resistive divider probes cost less than active probes Relatively heavy resistive loading with resistive divider probes

Active probes are least intrusive to circuit under test, Active probes have lower dynamic range, lower maximum voltage and

high input resistance are less rugged compared to passive probes

Resistive divider probes are

passive probes. They feature low

capacitive loading and accurate

timing measurements with high-

bandwidth signals at a much

lower cost than active probes.

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Agilent Technologies N1022A Manuel d'utilisateur Page 9

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