Time Electronics User Manual
5051 Plus and 7051 Plus Multifunction Calibrators v2.1
xx51+ Multifunction Calibrators Page 28 of 64
7.5. AC Current
The operation of the ACI screen is the same as DCI. In addition, the frequency of the output may be
set by entering a value using the numeric keypad and then pressing the Hz button. The present
frequency is shown in the top-right corner of the screen.
7.5.1. AC Frequency Limits
Note, the AC frequency limits are:
10Hz – 1kHz 0 - 220mA
20Hz – 500Hz Above 220mA
If the frequency entered is too high or too low for the present output, it will be changed to the nearest
allowed frequency.
Lowest Output Range – 200uA
It should be noted that the xx51, as with other precision AC current sources is not able to output
exactly zero. There is always a small residual current on the output terminals even when zero is
selected. This is typically 6 to 9uA. The unit is calibrated to be correct at 20uA (10% of range full-
scale) but should not be used for accurate calibration below this value.
AC I
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