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Types of probes (continued)

Differential active probes

A “differential” probe is an active

probe that has two inputs, one

positive and one negative, as

well as a separate ground lead; it

drives a single-terminated 50-Ω

cable to transmit its output to one

oscilloscope channel. The output

signal is proportional to the

difference between the voltages

appearing at the two inputs. A

differential probe is used to look

at signals that are referenced

to each other instead of earth

ground and to look at small

signals in the presence of large

DC offsets or other common mode

signals such as power line noise.

Differential active probe characteristics

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

N2772A 20:1 or 20 MHz Max input: 600 V CAT III, • For high-voltage circuits, High-impedance BNC input

200:1 1000 V CAT II motor control, power

(single-ended) or supply design

1000 Vdc, 1000 Vrms, • Requires N2773A power

1200 V DC +AC peak supply or 9-V battery

(differential)

1141A 1:1 200 MHz ±300 mV (1:1) ; • Surface-mount devices 50-Ω BNC input

±3 V (10:1) ; • Requires 1142A power

±30 V (100:1) with supply

attenuation

1153A

1:1 200 MHz ±300 mV (1:1) ; Surface-mount devices 50-Ω AutoProbe

±3 V (10:1) ; interface input

±30 V (100:1) with

attenuation

1 Not compatible with 5000, 6000, and 7000 Series

InfiniiMax single-ended and differential probes characteristics

Recommended

Model Attenuation Probe bandwidth Input dynamic range Applications and use oscilloscopes

1130A

10:1 1.5 GHz 5 V single ended, • Measure fast transitions 6000 (300 MHz-1 GHz), 7000,

±2.5 V differential 8000 Series

1131A

10:1 3.5 GHz 5 V single ended, DSO80204B, 80304B, 90254A

±2.5 V differential

1132A

10:1 5 GHz 5 V single ended, DSO80404B, 90404A

±2.5 V differential

1134A

10:1 7 GHz 5 V single ended, DSO80604B, 90604A

±2.5 V differential

1168A

1, 2

3.45:1 10 GHz 3.3 V single ended, DSO80804B, 81004B, 90804A

±1.65 V differential

1169A

1, 2

3.45:1 12 GHz 3.3 V single ended, DSO81204B, 81304B, 91204A

(13 GHz typical) ±1.65 V differential 91304A

1 Order one or more probe heads. See page 10 for available InfiniiMax probe heads and accessories.

2 Not compatible with 5000, 6000 and 7000 Series oscilloscopes.

• Measure fast

transitions on

low-voltage differential

or single-ended signals

• Full-bandwidth

probing system for

6000/8000/80000/90000

Series

• Requires one or more

probe head accessory

per amplifier

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

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