Frequency counter mode, Electrical – Agilent Technologies DP111 User Manual
Page 31
User Manual: Agilent Acqiris 8-bit Digitizers
Page 31 of 59
For the U1071A-FAMILY the offset control range is reduced slightly. It is [–2.3 V, +2.3 V] unloaded, or [-1.15 V,
+1.15 V] into 50
Ω.
3.10. Frequency Counter mode
The DC140 and DC135 digitizers offer an optional Frequency Counter (FC) mode. This option allows the
measurement of the average frequency or period of a signal for frequencies up to 400 MHz over a user-selectable
aperture between 1 ms and 1000 s. The accuracy is limited by that of the timebase, < 2 ppm; the short term stability
is of ~ 0.1 ppm. The accuracy can be improved if an appropriate external reference clock is used. Frequencies in
excess of 100 MHz will be measured using the HF divide by four feature of the trigger circuit.
A digitizer with the FC option can also totalize the number of triggers during a chosen time interval or a user-
provided gate signal. This can be done for trigger frequencies under 125 MHz and for total counts up to 2
48
. The time
interval is measured using the same clock as is being used to drive the digitizer. The user gate signal has to be made
available on one of the Control I/O inputs.
3.11. Electrical, Environmental and Physical Specifications
3.11.1. Electrical
Max. Power
Consumption (W)
Current Requirements (A)
(with Memory option)
Model PCI
Rev
DMA
Transfer
Rate
(MB/s)
Standard
WITH
MEMORY
OPTION
+12 V
+5 V
+3.3 V
-12 V
DP105
DP106
2.1 ~100
14.4
16.1
0.55 1.3(1.6) NA
NA
DP110
2.1 ~100
15.7
16.8
0.46 1.7(1.9) NA
0.02
DP111
2.1 ~100
18.0
21.3
0.75 1.4
(2.0) NA
0.03
DP210
2.1 ~100
21.8
24.0
0.6 2.4
(2.8) NA
0.05
DP211
DP212
2.1 ~100
18.0
21.3
0.75 1.4
(2.0) NA
0.05
DP214
DP235
DP240
2.2 ~100
24.4
27.3
0.8
1.2 1.8
(2.6) 0.05
DP1400
U1071A002
U1071A004
U1071AHZ1
U1071AHZ2
U1071AHZ4
U1091AD28
2.3 ~100
16.3
20.3
0.09
1.4 1.9(3.0) 0.04
DC110
2.1 ~100
16.7
18.6
0.7
1.1 0.4
(0.9) NA
DC135
DC135HZ
2.2
~20
13.1
14.6
0.46
0.46 1.1
(1.5) 0.04
DC140
DC140HZ
2.2
~20
14.2
17.1
0.46
0.46 1.4
(2.2) 0.04
DC211
DC211A
2.2 ~100
45.7
52.5
1.5
2.6 3.0
(4.9) 0.05
DC240
2.1 ~100
40.9
46.4
1.3
3
2
(3.5)
NA
DC241
DC241A
2.2 ~100
45.7
52.5
1.5
2.6 3.0
(4.9) 0.05
DC265
2.1 ~100
37.1
43.0
1.2
2.5 1.9
(3.5) 0.05
DC270
2.1 ~100
40.4
51.7
1.2
2.5 2.8
(5.9) 0.05