What might the attenuator resistors be ?
specification and supplier?
They are probably custom made.
I have looked and found nothing, when I repaired my first unit.
DVC-350AThere is one on eBay Germany right now
But it seems to have a broken display and is too expensive
http://www.ebay.de/itm/290660105128See pictures below
DCV-9500I have looked for a long time but have never seen one for sale
Well, I have not even seen a real picture of it.
But it has some impressive figures:
Part number DVC 9500• UNPRECEDENTED Calibration Accuracy < +/-0.0005% error or < +/- 5 PPM
• Less than 3 PPM / deg C temperature drift
• 13 types of Thermocouples output simulations
• Both a +/-20 Volt and +/-2 Volt Range ( programmable bipolar operation )
• Direct TOUCH PAD INTERFACE FOR INTUITIVE HUMAN INTERACTION
• Compact rugged aluminum case that takes up very little precious bench top space
• Digital Output Vernier control down to 1uV steps
• Settable limit controls to protect devices.
• Automatic standby function protects device under test
• Six (6) Manual/Automatic set points per output range
• Programmable Dwell time between set points
• Tellurium-Copper binding posts reduce thermal EMFs to <1uV
• Source 25ma Voltage output with 13 thermocouple ranges