Ground Impedance Isolation Monitor (aka GIZMo or ZMON)

Basic ZMON panel

Below is a screenshot of the basic ZMON display panel, obtained by clicking on "ZMON" box on the Overview panel in the CSS display.

Screenshot of the basic panels showing a table of current ZMON current values.

Plotting the history of a quantity

If you want to quickly see the history of the impedance (Z) over the last 5 minutes, 2 hours, or 3 days, click the "History" button.

Otherwise, right-click on any number, and select "Data Browser" to get an interactive window where you can select time range, vertical axis scale, and other quantities to make your own history plot, and export data if you wish. See the Slowmoncon_Data_Browser wiki page for more.

ZMON history panel

Below is a screenshot of the top 2/3 of a panel showing the impedance history on 3 different time scales.

Screenshot of the ZMON history panel.

Custom history

Please use the CSS Data Browser if you want to plot the history of the impedance over a different time frame. (See the Slowmoncon_Data_Browser wiki page for more.)

ZMON waveform panel

The signals from the impedance monitor are sampled at approximately 4000 samples/second and digitally averaged over almost exactly 1/60th of a second to remove any 60 Hz ripple. (The clock used to establish the 60 Hz averaging is synchronized using NTP.) There is considerable ripple in the IPCT peak current input despite aggressive analog filtering in the impedance monitor circuitry. The waveforms can be seen by clicking on the "Waveforms" button on the primary ZMON panel. It is not known as of this writing if these waveforms are interesting in any scientific sense.

A screenshot of the ZMON panel can be seen below, and a video can be seen at

Screenshot of the ZMON waveform panel.