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f) Adjust outside pot to read 2.630mV ±5µV on DVM.
g) DV-273 gauge tube is now calibrated.
HVC-282 calibration.
Course adjustment
(Caution: Resistor connections are not to any power terminals.)
a) With power off, connect an 86.6 ohm 1% 1/8W resistor to tube terminals white & green.
b) Connect a 28 ohm 1% 1/8W resistor to tube terminals red and black.
c) Connect a DVM to measure mV across the 28 ohm resistor with (+) lead to red terminal.
d) With power on, adjust trim pot on right side of can (Viewed from front display.)
to set 350mV ±0.5mV.
e) Set units display to read 0.00 by adjusting zero pot at rear of can.
f) With power off, attach a 2.630mV ±5µV DC source across (+) white (-) green the 86.6
ohm resistor.
g) With power on adjust span pot at rear of can till display reads 15.00 Torr.
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.
5.3 Check 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.