Agilent Technologies DC135 User 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 M
Ω 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 M
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 M
Ω 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).
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.
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
Rate
Max.
CONVER
TERS PER
CHANNEL/
CHANNELS
CONVER
TERS PER
CHANNEL/
CHANNELS
Default
Memory
Memory
points/
channel
channel
Maximum
Optional
Memory/
channel
Optional
Memory/
channel
Maximum
Segments
TTI
Reso-
lution
lution
Timebase
Accuracy
External
Clock
Clock
Max./
Min.
Thresh.
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