3458A Datasheet, PDF (7/27 Pages) Keysight Technologies – Shattering performance barriers of speed and accuracy

For Calibration Lab Precision
– 8.5 digits resolution
– 0.1 ppm DCV linearity
– 100 ppm ACV absolute
accuracy
– 4 ppm/year optional
stability
In the calibration lab, you’ll find the
3458A’s 8.5 digits to have extraordi-
nary linearity, low internal noise, and
excellent short term stability. The
linearity of the 3458A’s Multislope A
to D converter has been characterized
with state-of-the-art precision. Using
Josephsen Junction Array intrinsic
standards, linearity has been mea-
sured within ± 0.05 ppm of 10 volts.
The 3458A’s transfer accuracy for
10 volts DC is 0.1 ppm over 1 hour
± 0.5° C. Internal noise has been
reduced to less than 0.01 ppm rms
yielding 8.5 digits of usable resolution.
So, the right choice for your calibration
standard dmm is the 3458A.
DCV stability
The long term accuracy of the 3458A
is a remarkable 8 ppm per year—
more accurate than many system
dmms are after only a day. Option 002
gives you a higher stability voltage
reference specified to 4 ppm/year for
the ultimate performance.
Reduced-error resistance
The 3458A doesn’t stop with accurate
DCV. Similar measurement accuracy
is achieved for resistance, ACV, and
current. You can measure resistance
from 10 µΩ to 1 GΩ with midrange
accuracy of 2.2 ppm.
Finally, the 3458A, like its dmm pre-
decessors, offers offset-compensated
ohms on the 10 Ω to 100 kΩ ranges
to eliminate the errors introduced by
small series voltage offsets. Usable
for both two- and four-wire ohms, the
3458A supplies a current through the
unknown resistance, measures the
voltage drop, sets the current to zero,
and measures the voltage drop again.
The result is reduced error for
resistance measurements.
Precision ACV
The 3458A introduces new heights of
true rms AC volts performance with a
choice of traditional analog or a new
sampling technique for higher accu-
racy. For calibration sources and peri-
odic waveforms from 1 Hz to 10 MHz,
the 3458A’s precision sampling tech-
nique offers extraordinary accuracy.
With 100 ppm absolute accuracy for
45 Hz to 1 kHz or 170 ppm absolute
accuracy to 20 kHz, the 3458A will
enhance your measurement capabili-
ties. Accuracy is maintained for up to
2 years with only a single 10 volt DC
precision standard. No AC standards
are necessary. For higher speed and
less accuracy, the analog true rms
AC technique has a midband absolute
measurement accuracy of 300 ppm
using the same simple calibration
procedure. With a bandwidth of 10 Hz
to 2 MHz and reading rates to 50/
second, is an excellent choice for high
throughput computer-aided testing.
Easy calibration
The 3458A gives you low cost of
ownership with a simple, two-source
electronic calibration. With its superior
linearity, the 3458A is fully calibrated,
including AC, from a precision 10 VDC
source and a precision 10 kΩ resistor.
All ranges and functions are automat-
ically calibrated using precise internal
ratio transfer measurements relative
to these external standards. In addi-
tion, the 3458A’s internal voltage
standard and resistance standard are
calibrated. Now you can perform a
self-verifying, self- or auto-calibration
relative to the 3458A’s low drift inter-
nal standards at any time with the
ACAL command. So, if your dmm’s
environment changes, auto-calibration
optimizes your measurement accuracy.
Calibration security
Unlike other dmms, the 3458A goes
to great lengths to assure calibration
security. First, a password security
code “locks” calibration values and
the self-calibration function. Next, you
can easily store and recall a secured
message for noting items, such as
calibration date and due date. Plus,
the 3458A automatically increments
a calibration counter each time you
“unlock” the dmm — another safe-
guard against calibration tampering.
If you have a unique situation or
desire ultimate security, use the inter-
nal dmm hardwired switch to force
removal of the instrument covers to
perform calibration.
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