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 8.5digits to have extraordi-
nary linearity, low internal noise, and
excellent short term stability. The lin-
both two- and four-wire ohms, the
Easy calibration
3458A supplies a current through the
unknown resistance, measures the
voltage drop, sets the current to zero,
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 10Vdc
source and a precision 10kΩresistor.
All ranges and functions are automati-
cally 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.
earity of the 3458A’s Multislope A to D and measures the voltage drop again.
converter has been characterized with
state-of-the-art precision. Using
Josephsen Junction Array intrinsic
standards, linearity has been meas-
ured within 0.05 ppm of 10Volts. The
3458A’s transfer accuracy for 10 Volts
dc is 0.1 ppm over 1 hour 0.5ꢀC.
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.
The result is reduced error for resist-
ance 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
accuracy. For calibration sources
and periodic waveforms from 1Hz to
10MHz, the 3458A’s precision sam-
pling technique 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 meas-
urement capabilities. Accuracy is
maintained for up to 2 years with
only a single 10 Volt dc precision
dcV stability
The long term accuracy of the 3458A
is a remarkable 8ppm per year—more
accurate than many system dmms are
after only a day. Option 002 gives you
a higher stability voltage reference
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.
specified to 4ppm/year for the ultimate standard. No ac standards are
performance.
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.
Reduced-error resistance
The 3458A doesn’t stop with accurate
dcV. Similar measurement accuracy is
achieved for resistance, acV, and cur-
rent. You can measure resistance from
10 µΩ to 1GΩ with midrange accuracy
of 2.2 ppm.
Finally, the 3458A, like its dmm prede-
cessors, offers offset-compensated
Ohms on the 10 Ω to 100 kΩ ranges to
eliminate the errors introduced by
small series voltage offsets. Usable for
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