3.2.9. Using Probes

The 50 Ω and 1 MΩ input impedance settings make it possible to use Acqiris digitizers with a wide variety of probes. The 50 Ω setting is most commonly used for active probes and low impedance (500 Ω) passive probes. The 1 MΩ setting is normally used for high impedance probes. While it is possible to use a variety of different manufacturers high impedance probes we recommend the use of our model P001 Passive Probe. The model P001 is matched to the Acqiris digitizers to ensure that effects that can reduce measurement quality, such as bandwidth loss and capacitive loading, are minimized. The P001 features 300 MHz bandwidth, 10 MΩ input impedance and 10:1 attenuation. These specifications make it an excellent choice for most general purpose probing applications. Before using any Passive Probe with a digitizer care should be taken to check that the probe has been correctly adjusted (refer to the Probe’s Calibration procedure).

NOTE: Passive high impedance probes are not suitable for high fidelity measurements above 100 MHz. The non- negligible (5-10 pF) tip capacitance loads the signal causing distortion and/or ringing when combined with the ground lead inductance.

3.3.Data Acquisition

The table below summarizes the characteristics discussed in the sections that follow:

Model

Max.

Max.

 

Default

Maximum

Maximum

TTI

Timebase

External

 

Sampling

CONVER

Memory

Optional

Segments

Reso-

Accuracy

Clock

 

Rate

TERS PER

points/

Memory/

Max./

 

 

lution

 

 

 

CHANNEL/

channel

 

 

 

 

channel

 

 

 

Min.

 

 

CHANNELS

 

 

 

 

 

 

 

 

 

 

 

Thresh.

 

 

 

 

 

 

 

 

 

DP105

500 MS/s

1

/ 1

128K

2M

4000

80 ps

50 ppm

± 2 V

DP106

500 MS/s

1

/ 1

128K

2M

4000

80 ps

50 ppm

± 2 V

DP110

1 GS/s

1

/ 1

128K

8M

8000

80 ps

50 ppm

± 2 V

DP111

1 GS/s

1

/ 1

128K

2M

4000

5 ps

2 ppm

± 3 V

DP210

2 GS/s

1

/ 1

256K

16M

8000

5 ps

2 ppm

± 3 V

DP211

2 GS/s

1

/ 1*

256K

16M

8000

5 ps

2 ppm

± 3 V

DP212

2 GS/s

1

/ 1

256K

16M

8000

5 ps

2 ppm

± 3 V

DP214

2 GS/s

1

/ 1

256K

16M

8000

5 ps

2 ppm

± 2 V

DP235

1 GS/s

2

/ 2

128K

2M

4000

5 ps

2 ppm

± 2 V

DP240

2 GS/s

2

/ 2

128K

8M

8000

5 ps

2 ppm

± 2 V

DP1400

2 GS/s

2

/ 2

128K

NA

1000

~13ps

2 ppm

AC 0 V

DC110

1 GS/s

1 /1

128K

8M

8000

5 ps

50 ppm

± 2 V

DC135

1 GS/s

2 /2

128K

2M

4000

5 ps

2 ppm

± 2 V

DC140

2 GS/s

2

/ 2

128K

8M

8000

5 ps

2 ppm

± 2 V

DC211

4 GS/s

1

/ 1

512K

32M

8000

5 ps

2 ppm

± 2 V

DC211A

4 GS/s

1

/ 1

128K

8M

8000

5 ps

2 ppm

± 2 V

DC240

2 GS/s

1

/ 2

256K

16M

8000

5 ps

2 ppm

± 3 V

DC241

4 GS/s

2

/ 2

256K

16M

8000

5 ps

2 ppm

± 2 V

DC241A

4 GS/s

2

/ 2

128K

8M

8000

5 ps

2 ppm

± 2 V

DC265

500 MS/s

1

/ 4

128K

2M

4000

5 ps

2 ppm

± 2 V

DC270

1 GS/s

1

/ 4

128K

8M

8000

5 ps

2 ppm

± 2 V

DC271

4 GS/s

4

/ 4

128K

8M

8000

5 ps

2 ppm

± 2 V

DC271A

4 GS/s

4

/ 4

128K

8M

8000

5 ps

2 ppm

± 2 V

DC271AR

2 GS/s

2

/ 2

128K

8M

8000

5 ps

2 ppm

± 2 V

User Manual: Family of 8-bit Digitizers

 

 

 

 

Page 32 of 66

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Agilent Technologies DP214, DP240, DP212, DP110, DP1400, DP111, DP210, DP235, DP211, DP106, DP105 Using Probes, Data Acquisition