Hi Thanks for your reply
Here is the extract from the data sheet, it is a 1KV Glassman MK series.
Voltage monitor. J1-4
A 0-10v signal, positive with respect to common, and in direct proportion to output voltage, is available at this pin. a 10k Ohm limiting impedance protects the internal circuitry so that a digital voltmeter with greater than 10 Megohms input impedance should be used to monitor this output. It is also acceptable to use a 1 mA DC full scale instrument (i.e analog meter) for monitor purposes.
I am not using a multimeter to monitor the voltage I am using a labjack u3-HV.
I have a very tight budget so I am stuck with what I have already got.
Regards
John