288 Appendix A Specifications
4 / AC Voltage
General Information
The 3458A supports three techniques for measuring true rms AC voltage, each offering unique capabilities.
The desired measurement technique is selected through the SETACV command. The ACV functions will then
apply the chosen method for subsequent measurements.
The following section provides a brief description of the three operation modes along with a summary table
helpful in choosing the technique best suited to your specific measurement need.
Selection Table
Synchronous Sub-sampled Mode (ACV Function, SETACV SYNC)
AC Accuracy
2
24 Hour to 2 Year (% of Reading + % of Range)
SETACV SYNC
Synchronously Sub-sampled Computed true rms technique.
This technique provides excellent linearity and the most accurate measurement results.
It does require that the input signal be repetitive (not random noise, for example). The
bandwidth in this mode is from 1 Hz to 10 MHz.
SETACV ANA
Analog Computing true rms conversion technique.
This is the measurement technique at power-up or following an instrument reset. This
mode works well with any signal within its 10 Hz to 2 MHz bandwidth and provides the
fastest measurement speeds.
SETACV RNDM
Random Sampled Computed true rms technique.
This technique again provides excellent linearity; however, the overall accuracy is the
lowest of the three modes. It does not require a repetitive input signal and is, therefore,
well suited to wideband noise measurements
. The bandwidth in this mode is from 20
HZ to 10 MHZ.
Best Repetitive Readings /Sec
Technique Frequency Range Accuracy Signal Required Minimum Maximum
Synchronous Sub-
sampled
1 Hz –10 MHz 0.010% Yes 0.025 10
Analog 10 Hz – 2 MHz 0.03% No 0.8 50
Random Sampled 20 Hz – 10 MHz 0.1% No 0.025 45
Range Full Scale Maximum
Resolution
Input Impedance
Temperature Coefficient
1
(% of Reading +% of Range) /°C
10 mV 12.00000 10 nV 1 MW±15% with<140pF 0.003 + 0.02
100 mV 120.00000 10 nV 1 MW±15% with<140pF 0.0025 + 0.0001
2
1V 1.2000000 100 nV 1 MW±15% with <140pF 0.0025 + 0.0001
10 V 12.000000 1 µV 1 MW±2% with <140pF 0.0025 + 0.0001
100 V 120.00000 10 µV 1 MW±2% with <140pF 0.0025 + 0.0001
1000 V 700.0000 100 µV 1 MW±2% with <140pF 0.0025 + 0.0001
ACBAND £ 2 MHz
Range
1 Hz to
3
40 Hz
40 Hz to
3
1 kHz
1 kHz to
3
20 kHz
20 kHz to
3
50 kHz
50 kHz to
100 kHz
100 kHz to
300 kHz
300 kHz to
1 MHz
1 MHz to
2 MHz
10 mV 0.03 + 0.03 0.02 + 0.011 0.03 + 0.011 0.1 + 0.011 0.5 + 0.011 4.0 + 0.02
100 mV–10 V 0.007 + 0.004 0.007 + 0.002 0.014 + 0.002 0.03 + 0.002 0.08 + 0.002 0.3 + 0.01 1 + 0.01 1.5 + 0.01
100 V 0.02 + 0.004 0.02 + 0.002 0.02 + 0.002 0.035 + 0.002 0.12 + 0.002 0.4 + 0.01 1.5 + 0.01
1000 V 0.04 + 0.004 0.04 + 0.002 0.06 + 0.002 0.12 + 0.002 0.3 + 0.002
1. Additional error beyond ±1°C,
but within + 5°C of last ACAL.
For ACBAND > 2 MHz, use
10 mV range temperature
coefficient for all ranges.
2. Specifications apply full scale
to 10% of full scale, DC
< 10% of AC, sine wave input,
crest factor = 1.4, and
PRESET. Within 24 hours and
±1°C of last ACAL. Lo to
Guard Switch on.
Peak (AC + DC) input limited
to 5 x full scale for all ranges in
ACV function.
Add 2 ppm of reading
additional error for Agilent
factory traceability of 10 V DC
to US NIST.
3. LFILTER ON recommended.
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