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DA1822A and DA1820A
DISCONTINUED
Leading Features
DC to 10 MHz
100,000 to 1 CMRR
Gain of 1, 10, 100 &
PRODUCTS
Bandwidth
1000
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Full Upper & Lower
The DA1820A/1822 is a
differential
amplifier. It is intended to act as a signal
preamplifier for oscilloscopes and network and
providing differential measurement
a single-ended
Amplifier gain can be set
DA1822A can extend
A
built-in input attenuator can be separately set to attenuate
factor of 10, allowing gains of 1000, 100, 10, 1,
mode dynamic range of
further increase the maximum input
proportion to their
maximum input
probe
attenuation, amplifier gain and attenuator settings, is
displayed.
The DA1820A/1822 have a
can select from a
points. In
critical measurements, the signal
Bandwidth Limits
stand-alone, high-performance 10 MHz
spectrum analyzers,
capability to instruments having only
input.
to 1, 10, 100 or 1000. The high gain of the
the sensitivity of a scope with 2 mV/div to 2
or 0.1 and common
±
15.5 V (÷1) or ±155 V (÷
signal and common mode ranges in
attenuation ratio, but not exceeding the probe's
voltage rating. Effective gain of the DA1822A, including
bandwidth of DC to 10 MHz, but the operator
full complement of high
-
and low-frequency -3 dB
-to-
noise ratio can be
improved by restricting the amplifier bandwidth to the
interest.
conditioning
µ
V/div.
signals by a
10). Optional probes
automatically
greatly
frequency range of
The DA1822A features a
can be set to
any voltage between
Offset) with up to 5
as an input to
the inverting (-)
built-in Precision Voltage Generator (PVG) that
±
1/2
digit
resolution. The PVG's output can be selected
15.5 volts (±10 volts in Differential
input of the amplifier for operation as a
differential comparator or applied internally as a true
voltage. The voltage is also available to
be used externally through a rear
differential offset
panel connector. The PVG is
not included in the model 1820.
The DA1820A/1822 operate
switching. A wide range
available for use
selectable (÷10/÷100) attenuation probes, the DXC350A
impedance (92 meg/2.4 pF) probe and the
with the DA1820A/1822. These include the DXC100A
Comparator Mode (DA1822A only)
The DA1822A becomes a
Precision Voltage
inverting (-)
accurately measure relatively small signals that are
DC components. Due to the precision and
voltage
make voltage measurements that are much more accurate than the
oscilloscope is capable of by itself. The output of the PVG is
external use via a rear-panel connector. When
mode, the DA1822A's "-"
and the DA1822A's "
then use the
to the PVG's value with any point on the "+" Input signal. The
point in the PVG readout is automatically positioned
DA1822A's attenuator and any probe
generator, an oscilloscope, when used with the DA1822A, can
Generator (PVG) output is selected as the amplifier's
input. In this mode, the DA1822A can be used to
-"
PVG as a very accurate position or offset control to compare
from 100 to 250 V AC line without line
of high-performance differential probes are
÷
1 DXC200A
probes.
differential comparator when the internal
riding on large AC or
51/2 digit resolution of the
used in the comparison
Input is
Input probe is no longer used. The operator can
connected to the output of the PVG,
to account for the
attenuation.
÷
100
high
very
available for
decimal
-
True Differential Offset Mode
The built-in PVG can be
still
allowing both inputs to be used as differential inputs.
differential offset mode is very similar to
except the "-"
the output of
amplifier (an external voltage can be supplied to the
now functions as if a zero impedance
placed in series with the "
is automatically
attenuation
This mode facilitates
transistor's base to
and/or
value that will zero out the static value of the
DA1822A's differential measurement
signal common to both sides
measure only
voltage.
current. Used in this mode, the voltage generator can be set
Input of the
the PVG is used to generate an offset within the DA1822A's
placed to account for DA1822A attenuator and probe
factors as well as the DA1822A's gain setting.
the changes in the junction
used to generate a true differential offset while
DA1820A/1822 is still functional. In this mode,
-"
Input. The decimal point in the PVG readout
making measurements such as changes to a
emitter voltage caused by variations in temperature
of the junction, and the oscilloscope is left to
that of the comparison mode,
adjustable voltage source were
junction's on voltage. The
capability will reject any dynamic
Precision Voltage Generator (DA1822A only)
Operation in the
DA1820A). The PVG
to a
The Precision Voltage
knob.
Each digit can be individually incremented or decremented and
rollover automatically carries to the next digit. The range of
is ±15.5 V for the comparator mode and
mode. This range is multiplied
and internal
allows for a DC accuracy specification of 0.05% +500
The DA1820A/1822 input is
attenuator. The generator's temperature
Generator is controlled from the oscilloscope offset
±
10.0 V
by the attenuation factor of the probes
protected to ±250 V and will automatically
for differential offset
-
controlled
µV.
the generator
oven
disconnect large
signals.
Upper & Lower Bandwidth Limits
The DA1820A/1822 allows
frequency -3 dB
3
MHz, 1 MHz, 300 kHz, 100 kHz, 30 kHz, 10 kHz, 3 kHz, 1 kHz,
and 100 Hz. Selections for the lower frequency
0.1 Hz, 1 Hz, 10 Hz, 100 Hz, and 1 kHz. These
improve the signal-to-noise ratio
microvolt magnitude
Autobalance
Each time any of the gain
the amplifiers DC
Specifications
General
Amplifier
Gain
accuracy: ±
Bandwidth
Risetime:
Output
Intended
Maximum
Input
÷
10 Attenuator
accuracy
Max differential linear
Gain
Input noise
GAIN):
DC drift
Common mode
rejection ratio
Max common
input range
Input resistance
( ÷
( ÷
and/or with
attenuating
attached)
Input capacitance (
or ÷10
Bandwidth
Upper:
impedance:
attenuation
5V
Setting
(x10 GAIN)
1 Attenuator)
10 Attenuator
Attenuator)
points. Selections for the high frequency
balance.
gain:
:
output load:
output:
:
:
x (combined internal and probe's
(x10
:
mode
:
:
probe
:
limit filters
the user to select both the upper and lower
when making measurements on
signals.
÷ 1
:
÷
:
buttons is pressed, the DA1820A/1822 adjusts
1, 10, 100
1% +
(x1 or x10
(x100 GAIN) DC to 3 MHz
(x1000
(x1 or x10
50
ohm
50
ohm
limited at ±5 V into 50 ohm
or ÷10
±
0.05%
input
1
:
< 9
nV/sqrt Hz, broadband
50 µV/
See graph
(÷ 1
Attenuator):
(÷
10 Attenuator):
(÷
10 Attenuator and x10 probe):
1 M(ohm)
1
M(ohm)
20
pF
3 MHz, 1
or 1000
uncertainty of termination resistance
GAIN) DC to 10 MHz
GAIN) DC to 1 MHz
GAIN) <35 ns
°C
on previous page.
or 100 M(ohm)
MHz, 300 kHz, 100 kHz, 30 kHz, 10
-
3 dB
filters make it possible to
attenuation factor)
±
15.5 V
±
155 V
-
3 dB points are
points are
300 Hz,
±
1.55
kV
1
kHz, 3 kHz, 1 kHz, 300
Lower:
Filter
characteristics
+ Input
-
Input
Input coupling
capacitor
Input gate
and x10 GAIN,
Attenuator)
Input
Differential Offset
Differential
(x10 GAIN or
Attenuator)
(x1 GAIN,
Attenuator)
(x10 GAIN or
÷
10 Attenuator)
(x1 GAIN,
Attenuator)
(x1 GAIN,
Attenuator, x10
probe):
Differential Offset Accuracy
(x10 GAIN or
÷
1 Attenuator
(x1 GAIN,
Attenuator)
(x10 GAIN or
higher,÷10
Attenuator)
(x1 GAIN,
Attenuator)
Comparison Offset (VCOMP)
Effective comparison voltage range (not
setting)
( ÷
( ÷10 Attenuator)
( ÷
Attenuator)
selections:
selections:
:
current (x1
:
protection
offset range (referred to input):
:
÷ 1
:
÷
10
:
÷
10
÷ 1
:
:
÷10
:
:
1 Attenuator)
10 probe and
:
÷ 1
:
(VDIFF) Mode
higher,
higher,
:
higher,
):
:
:
÷10
0.1 Hz, 1
:
6
dB/octave
AC, OFF
AC, OFF
0.1 µF,400
<10 pA, 0-45°C
protected
disconnect with manual
÷
± 1
±10 V
±10 V
±
100
±
1.0
0.1% + 50
0.1% + 500
0.15% +
0.15% + 5
±
15.5
±
155
1.55
(precharge), DC
(precharge), DC, VCOMP
V
V
kV
Mode
V
V
kV
Hz and 100 Hz
Hz, 10 Hz, 100 Hz and 1 kHz
V DC
to ± 250 V, automatic input
reset.
µV
µV
500
µV
mV
effected by gain
Precision Voltage Source
Output range
DC accuracy:
Resolution
Temperature
coefficient:
Type
:
Output
Autozero
:
:
:
:
±
15.5
V
0.05% of
up to 100 µV (51/2 digit)
typically
<5 ppm/°C of full
Oven
Applied to
rear
Sets
and periodically
reading +500 µV (15° to 45°C)
scale
stabilized buried zener.
inverting input and available at
panel.
output to zero when 0.0 volts selected
thereafter.
Power Requirements
Line voltage
requirement
Line frequency
Power requirement:
Environmental Characteristics
Operating Range
Non-Operating:
Physical Characteristics
Height:
Width:
Depth
Weight
Shipping Weight
:
:
range
:
:
:
:
100 to 250
48 - 66
~ 28 W, ~
0° to 50
-4° to 75
7.29
21.2
23.2 cm
2.15 kg
3.12
Hz
cm (2.87")
cm (8.36")
(4.75 lb)
kg (6.88 lb)
V AC
39 UA
°C
°C
(9.12")
Warranty: 3
Ordering Information
Model
DA1822A
DISCONTINUED
DA1822A-PR2
DISCONTINUED
DA1820A
DISCONTINUED
DA1820A-PR2
DISCONTINUED
Description
10 MHz Differential
Probe Sensing
2 Ch, 10 MHz
with Full Upper
10 MHz Differential
2 Ch 10 MHz
with Full Upper
years
Amplifier with Precision Source;
Differential Amplifier and Comparator
and Lower Bandwidth
Amplifier
Differential Amplifier and Comparator
and Lower Bandwidth Limits.
Model
DXC100A
Description
100:1 or 10:1
Probe
Pair
Selectable 250 MHz Passive Differential
E-Mail
DXC200
DXC350A
DISCONTINUED
DXC5100
DA101
DA18XX-RM01
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1:1, 50 MHz Passive
100:1, 250 MHz, 92
Pair
100:1, 250 MHz,
10:1, 1 MOhm Passive
Rackmount Adapter
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Copyright © LeCroy Corporation
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Differential Probe Pair
MOhm, 2.6 pF Differential Probe
2.5kV High Voltage Probe Pair
Attenuator
for DA18XX-PR2, Size (2U)
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2007
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