MIL-DTL-22442G
i. Voltage base accuracy: ±3 percent.
j. Input impedance: l megohm minimum.
6.4.1.8 ac power supply (optional).
a. Sine wave output.
b. Frequency range: 100 to 6,000 Hz minimum.
c. Frequency accuracy and flatness at full output: ±2 percent.
d. Harmonic distortion: Less than -65 dB (relative to fundamental) at full output for each
frequency.
e. dc offset: 1 millivolts maximum.
f. Voltage range: l millivolts to 15 volts.
g. Output power: 220 VA with continuous volt-ampere output even under zero or unity
power factor loads.
h. Output isolated from ground up to 30 volts.
6.4.1.9. ac ratio transformer standard.
a. Ratio: 1.111111 maximum, 0.0111111 minimum.
b. Frequency range: 50 Hz to 10 KHz.
c. Terminal linearity: 0.0001 percent (l ppm).
d. Resolution: 0.00001 percent steps.
e. Maximum effective series impedance: R series 3.5 ohms, L series 100 microhenries.
f. Output isolated from the input.
6.4.2 NBS traceability problems for calibrated ac true rms voltmeters. The amplifier input
voltage range of 50 to 500 microvolts rms creates NBS traceability problems for calibrated ac
true rms voltmeters. Many multimeter and true rms voltmeters have unwarranted claims as to an
ac true microvoltage measuring capability. On the lowest range scale, the instruments do not
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