5520A
Getting Started
24
The following paragraphs provide additional specifications for the 5520A 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 5520A 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. (See the 5520A
Operators Manual, Chapter 4, “Front Panel Operation.”)
Frequency Specifications
Frequency 1-Year Absolute Uncertainty,
Range
Resolution
tcal ± 5°C Jitter
0.01 Hz to 119.99 Hz 0.01 Hz
120.0 Hz to 1199.9 Hz 0.1 Hz
1.200 kHz to 11.999 kHz 1.0 Hz 2.5 ppm ± 5 µHz [1] 100 nS
12.00 kHz to 119.99 kHz 10 Hz
120.0 kHz to 1199.9 kHz 100 Hz
1.200 MHz to 2.000 MHz 1 kHz
[1] With REF CLK set to ext, the frequency uncertainty of the 5520A is the uncertainty of the external
10 MHz clock ±5 µHz. The amplitude of the 10 MHz external reference clock signal should be between
1 V and 5 V p-p.
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