Agilent Technologies DP214, DP240, DP212, DP110, DP1400 manual Using Probes, Data Acquisition, DC271AR

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