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VARs When the Power Factor approaches 0.0, the Watts output uncertainty becomes unrealistic because the dominant
characteristic is the VARs (volts-amps-reactive) output. In these cases, calculate the Total VARs Output Uncertainty, as
shown in example 3:
Example 3 Output: 100 V, 1 A, 60 Hz, Power Factor = 0.174 (Φ=80)
Voltage Uncertainty Uncertainty for 100 V at 400 Hz is, 150 ppm + 2 mV, totaling:
-6
100 V x 190 x 10
= 15 mV added to 2 mV = 17 mV. Expressed in percent:
17 mV/100V x 100 = 0.017 % (see "AC Voltage (Sine Wave) Specifications").
Current Uncertainty Uncertainty for 1 A is 0.05 % 100 μA, totaling:
1 A x 0.0005 = 500 μA added to 100 μA = 0.6 mA. Expressed in percent:
0.6 mA/1 A x 100 = 0.06 % (see "AC Current (Sine Waves) Specifications").
VARs Adder VARs Adder for Φ=80 at 60 Hz is 0.03 % (see "Phase Specifications").
Total VARS Output Uncertainty =
Additional Specifications
The following paragraphs provide additional specifications for the 5522A Calibrator ac voltage and ac current functions.
These specifications are valid after allowing a warm-up period of 30 minutes, or twice the time the 5522A has been turned
off. All extended range specifications are based on performing the internal zero-cal function at weekly intervals, or when
the ambient temperature changes by more than 5 °C.
Frequency
Frequency Range
0.01 to 119.99 Hz
120.0 to 1199.9 Hz
1.200 to 11.999 kHz
12.00 to 119.99 kHz
120.0 to 1199.9 kHz
1.200 to 2.000 MHz
With REF CLK set to ext, the frequency uncertainty of the 5522A is the uncertainty of the external 10 MHz clock ± 5 μ Hz. The
[1]
amplitude of the 10 MHz external reference clock signal should be between 1 V and 5 V p-p.
nd
Harmonics (2
to 50
Fundamental
[1]
NORMAL Terminals
Frequency
10 to 45 Hz
33 mV to 32.9999 V
45 to 65 Hz
33 mV to 1020 V
65 to 500 Hz
33 mV to 1020 V
500 Hz to 5 kHz
330 mV to 1020 V
5 to 10 kHz
10 to 30 kHz
[1]
The maximum frequency of the harmonic output is 30 kHz (10 kHz for 3 to 5 V on the Aux terminals). For example, if the
fundamental output is 5 kHz, the maximum selection is the 6th harmonic (30 kHz). All harmonic frequencies (2nd to 50th) are
available for fundamental outputs between 10 Hz and 600 Hz (200 Hz for 3 to 5 V on the Aux terminals).
Phase Uncertainty................................................. Phase uncertainty for harmonic outputs is 1 degree or the phase
Example of determining Amplitude Uncertainty in a Dual Output Harmonic Mode
What are the amplitude uncertainties for the following dual outputs?
NORMAL (Fundamental) Output:
100V, 100 Hz .................................................. From "AC Voltage (Sine Wave) Specifications" the single output
+
+
2
2
U
=
. 0
017
. 0
06
. 0
03
VARs
Resolution
0.01 Hz
0.1 Hz
1.0 Hz
10 Hz
100 Hz
1 kHz
th
)
Voltages
3.3 mA to 2.99999 A
3.3 mA to 20.5 A
33 mA to 20.5 A
33 mA to 20.5 A
3.3 to 1020 V
329.9999 mA
3.3 to 1020 V
329.9999 mA
uncertainty shown in "Phase Specifications" for the particular output,
whichever is greater. For example, the phase uncertainty of a 400 Hz
fundamental output and 10 kHz harmonic output is 10 ° (from "Phase
Specifications"). Another example, the phase uncertainty of a 60 Hz
fundamental output and a 400 Hz harmonic output is 1 degree.
specification for 100V, 100 Hz, is 0.015 % + 2 mV. For the dual output
Introduction and Specifications
=
2
. 0
069
%
1-Year Absolute Uncertainty,
tcal ±5 °C
2.5 ppm +5 μHz
Voltages
Currents
AUX Terminals
10 mV to 5 V
10 mV to 5 V
100 mV to 5 V
100 mV to 5 V
33 to
100 mV to 5 V
33 to
100 mV to
3.29999 V
Additional Specifications
Jitter
[1]
100 nS
Amplitude
Uncertainty
Same % of
output as the
equivalent single
output, but twice
the floor adder.
1
1-21
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