A possible reason for the flickering wrench icon to occur is a relatively low load of approximately 500 to 525 mA RMS being applied on the current inputs of the PM200 or PM700 (with firmware version 2.020 or previous). This low load will cause the gain change to flip back and forth between low and high gain. This causes the wrench icon to flicker on and off due to clipping during high gain at the transition point.
Firmware version 3.050 or later will check the peak amplitude prior to changing from low gain to high gain and delay the transition to high gain to prevent clipping.
The Series 700 and 200 Power Meters with firmware 2.020 requires a firmware update to version 3.050 or above.
To verify the firmware version from the front panel of the meter, press MAINT > INFO for the PM700 and press DIAGN > INFO for the PM200.
See FA237920 for latest firmware, firmware upload software, and instruction on how to upgrade the firmware.