DigiVac DVG-6 Manuel d'instruction - Page 6

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5.0

TROUBLESHOOTING

If the gauge reads 760 torr and does not respond to vacuum, it is likely that the

thermocouple voltage is not getting to the gauge. The cause could be:

Bad thermocouple

Bad cable connection On Model 200P, check cable wires at terminal strip

If the gauge reads 0:

Bad thermocouple

Bad cable connections See above

6.0

RECALIBRATION

If the tube is replaced, the unit must be recalibrated. It is best if this is performed at

Digivac. If field calibration is done, the zero and span adjustments are available on two

potentiometers which are accessible by removing the front panel of the instrument. The

zero is on the right and the span is on the left. Make slight adjustments and wait a few

seconds for the effects of the adjustments to be seen. On the 801 series gauges, the zero

adjustment is located on the front panel.

Atmosphere

▪ Energize the unit at atmospheric pressure. Remove the front panel.

▪ Make sure that the gauge tube is in a vertical orientation, because it is position sensitive.

▪ Connect a Voltmeter to the two pads available from the right side of the printed circuit

board, these are called Zero and Atm .420

▪ Adjust the potentiometer labeled "Atm" (leftmost) until the voltage above equals .420

▪ This gives an approximate adjustment. Now expose the tube to a pressure of 600

millimeters of mercury and adjust for 600 on the display.

Zero

Operate the unit at the lowest attainable pressure.

▪ 1 Micron with a diffusion pump,

▪ 10 to 15 Microns from a belt-driven two-stage mechanical pump,

▪ 35 Microns from a direct-drive, two-stage mechanical pump,

▪ 500 Microns from a single-stage mechanical pump,

Replace gauge tube

On Model 200, check red, black, green and white wires on 9 pin

dsub connector

On all units, check soldered connections

On octal connector

Replace gauge tube

Model 200 with

cover removed

Atmos Adj.

Zero

Adj.