Graphics Tablet User's Manual

User Manual: Family of 8-bit Digitizers Page 32 of 66
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.
Sampling
Rate
Max.
CONVER
TERS PER
CHANNEL/
CHANNELS
Default
Memory
points/
channel
Maximum
Optional
Memory/
channel
Maximum
Segments
TTI
Reso-
lution
Timebase
Accuracy
External
Clock
Max./
Min.
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