46
• If fuses burn out repeatedly, call MKS Instruments.
• If the digital display consistently shows -LO or OFF, it may be that one of the internal power supply
protection devices has removed power to the CDG. You may check this by measuring the voltage at
the connector or cable for the unaffected gauge. Since power for both gauges use the same
protection device, either connector will show the power supply voltages. Normal range for the
voltages is 14.5 to 15.5 volts for both +15 volts and -15 volts. +15 may be measured on the red wire;
-15 is on the green wire; power return is on the black wire. If the power supply protection has shut
the power off, you will typically measure less than 4 volts on the affected supply.
• If you verify that either power supply is shut off, remove power from the CDG for a few minutes to
allow the protection device to reset itself. The protection device does not need to be replaced; it is a
reusable thermal fuse.
• You may wish to determine the cause for the loss of power supply voltage before applying power
again. The PDR 2000 will protect itself if it finds excessive power draw again.
• It is normal for the PDR 2000 to feel warm to touch along the left side of the case. This is especially
true when operating heated CDGs because of the greater power they require.
•
Index
A
Attaching the CDG Cable, 26
Attaching the Power Cord, 30
C
Checking Supply Voltage, 30
Connecting the CDG, 26
Controls and Indicators, 20
D
Description of Parameter Selection and
Adjustment, 32
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