Is it a requirement that electrical supply of 8890/5977C GC/MS needs to have neutral-to-ground voltage of less than 1 V?

Question

A 5977C GC/MSD system is installed in our QC laboratory. The technical service claims that there is a <1 V requirement for neutral-to-ground voltage. But I can't find anywhere in Agilent documents this requirement, including Installation and Site Prep guides. I requested the relevant documents for this statement from them; I've yet to get an answer. 
 Is it really a "must"; or the service is playing it "safe" unnecessarily?

paulsalverda · Accepted Answer

High neutral to ground voltage may result in GC or MS communication resets and other strange problems that are difficult to find and solve. An online search will find that <2 V RMS neutral to ground is recommended for everyday house wiring. This is what I send... 
 
 Line voltage, 120, 208, 220, or 240, +5% | -10% with NO spikes, fluctuations, or transients outside of that range for each voltage. 
 Line frequency of 48 to 63 Hz with no fluctuations or transients outside of that range. 
 Ground to Neutral <= 0.5V RMS 
 
 This is page 15 of the 5977C Site Preparation Checklist. I added the red box highlight. Have an electrician verify the circuit.

Is it a requirement that electrical supply of 8890/5977C GC/MS needs to have neutral-to-ground voltage of less than 1 V?

Top Replies