Teledyne 40, Power Supply Calibration and Adjustments, SECTION 3

Calibration and AdjustmentsSECTION 3

This section contains instructions to change the configuration of the power supply from the way

it was set up at the factory.

Since the display uses a 3-1/2 digit LCD, the highest number that can be displayed is 1999. If

the display is to read directly in the flow units being used, it must be adjusted whenever the highest

digit of the maximum flow rate changes, such as, a 20 SLPM flow instrument being changed to 5

SLPM. If a 10 SLPM unit is exchanged for a 10 SCCM unit, the display will not need to be

changed at all. If a 5 SLPM unit is changed to a 500 SCCM unit, then only the decimal point needs

to be changed, per Section 3.1.2.

3.1.1 Displa3.1.1 Displa

3.1.1 Display y

y y

y AdjustmentAdjustment

AdjustmentAdjustment

Adjustment

To change the display, remove the two screws on the top of the back panel. Slide the aluminum

perforated top coverout. Turn the CHANNEL SELECTOR switch to the desired channel. Verify

that the conversion factor has been set to the correct value, by depressing the CORRECTION

FACTOR switch. The correction factor should be 1.000 if the factor has not been changed by the

customer since the factory setup. If the value has been changed by the customer, determine the

correct value for the gas flowing through the flowmeter per Section 3.2. Compare the observed

value to the calculated value. Generate the maximum flow signal (5.000 volts) from the flowmeter,

Switches are shown

set for one place

to the right of the

decimal point for

Channel 3.

DISPLAY-ADJUST

POTENTIOMENTERS

CHANNELSCHANNELS

CHANNELS

FIG 3.1FIG 3.1

FIG 3.1

Not operator serviceable, observe precautions when handling, do not pull cover further

back more than necessary, some components toward the rear of the PC Board may be

High High

High VV

Voltage,oltage,

oltage,oltage,

oltage,

leave servicing to qualified personnel..

4 3 2 1