Teledyne HVC-282 instruction manual 5.3Check Against Primary Standard

f)Adjust outside pot to read 2.630mV ±5∝V on DVM.

g)DV-273 gauge tube is now calibrated.

HVC-282calibration.

Courseadjustment

(Caution:Resistorconnectionsarenottoanypowerterminals.)

a)Withpoweroff,connectan86.6ohm1%1/8Wresistortotubeterminalswhite&green.

b)Connecta28ohm1%1/8Wresistortotubeterminalsredandblack.

c)ConnectaDVMtomeasuremVacrossthe28ohmresistorwith(+)leadtoredterminal.

d)Withpoweron,adjusttrimpotonrightsideofcan(Viewedfromfrontdisplay.)

to set 350mV ±0.5mV.

e)Setunitsdisplaytoread0.00byadjustingzeropotatrearofcan.

f)Withpoweroff,attacha2.630mV±5∝VDCsourceacross(+)white(-)greenthe86.6 ohm resistor.

g)Withpoweronadjustspanpotatrearofcantilldisplayreads15.00Torr.

Hastings) HVC-282 is now coarsely calibrated.

Fine adjustment.

Due to bridge loading, you will need to readjust zero and span pots using a good or above calibrated DV- 273.

a)Connect and run unit for 30 minutes at hard vacuum (< 1mTorr) so system may out gas.

b)Readjust zero pot at rear of can if necessary, to set display to read 0.00 Torr.

c)Using a Primary standard, bring system up to 15.000 Torr ±1mTorr.

d)Readjust span pot at rear of can if necessary, to set display to read 15.00 Torr.

e)Fine Calibration is now complete.

5.3Check Against Primary Standard:

If additional calibrations of the vacuum gauge are desired, an accurate measuring device such as the McLeod Gauge, spinning rotor gauge, or capacitance manometer may be employed as a reference. Please refer to manufacture for the suitability requirements. Please read Sec. 6.

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