Philips pm2480 programmable Voltage standard

This nice instrument was given to me as being a power supply. In real it is a Voltage/current  standard for calibratring multimeters. It comes from the Philips service centre in Eindhoven. It is probably from 1974.



It is programmable. So you can hook up a meter  and run a program. That is handy if you are doing series of meters. I do not do that so I never tried that function.

The display is great with those huge nixies.

Some specs:
– CMR 100dB (50Hz), 140 dB (DC)
– 0-1199.999V in 4 ranges, max resolution 1 uV
– Tempco at 23 +/- 1 C and 70%RH is 0.0003%/C
– 24H accuracy 0.0015%, 3 months accuracy 0.004%
– linearity: deviation less than 0.0003% of range
– 0-119.9999mA in 4 ranges with 1nA max resolution
– 24H accuracy 0.005% , 3 month accuracy 0.016%

The value you dial in is tranferred in BCD and a PWM modulator turns it into a AC level and that is tranferred into a DC level.

I have the full manual and schematics including handwritten papers about production. The unit is original a Takeda Riken Industry CO ltd. Model TR-6120 but relabled by Philips. The notes are hard to read  but it looks like it is about changes for the Philips version.


This entry was posted in Calibration gear, Measurement gear. Bookmark the permalink.

Comments are closed.