Lakeshore 340 - Front Panel Curve Copy; Front Panel Curve Erase

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Lake Shore Model 340 Temperature Controller User’s Manual

Instrument Programming 8-3

Setting resolution is also six digits in sensor units. The curve format parameter defines the range and

resolution in sensor units as shown in Table 8-1. The sensor type determines the practical setting resolution.

Table 8-1 lists recommended sensor units resolutions. For most sensors, additional resolution is ignored.

The breakpoints should be entered with the sensor units value increasing as point number increases. There

should not be any breakpoint locations left blank in the middle of a curve. The search routine in the Model 340

interprets a blank breakpoint as the end of the curve.

NOTE: If the curve you wish to enter has similar parameters to an existing curve, first copy the similar curve

(as described in Paragraph 8.1.5) to a new location, then edit the curve to the desired parameters.

To enter a curve, press the Curve Entry key. Press

the Next Setting key until Edit curve is selected,

then press the Enter key. Use the s or t key to

select the desired curve number to edit, then press

the Enter key.

You may now enter the serial number (SN), Limit,

Format, and Sensor/Temp (K) breakpoint pairs. Use the Previous Setting and Next Setting keys to move

from one edit field to the next. Use the I and D keys to Insert or Delete lines from the breakpoint field. When

the edit is complete, press the Save Screen key. The Saving user curves... message appears for a few

seconds. If you do not wish to save the new curve, press the Cancel Screen key.

8.1.4 Front Panel Curve Copy

Curves can be copied from one location inside the Model 340 to another. This is a good way to make small

changes to an existing curve. Curve copy may also be necessary if the user needs the same curve with two

different temperature limits or needs to extend the range of a standard curve. The curve that is copied is

always preserved.

NOTE: Copying an internal curve from one location to another is not the same as copying (or

downloading) a curve from a data card to the Model 340. The data card curve downloading

procedure is provided in Paragraph 8.4.

To copy a curve, press the Curve Entry key. Press

the Next Setting key until Copy curve is selected,

then press the Enter key.

Change to the desired curve number with the s or

t key, then press the Enter key. The cursor jumps

to the To: selection. Again, use the s or t key to

select the user curve number (21 to 60) the curve will be copied to. (Empty user curves have zeros for data.)

NOTE: The copy routine allows you to overwrite an existing user curve. Please ensure the curve number

you are writing to is correct before proceeding with curve copy.

Once the curve number to copy to has been selected, press the Enter key. The following message is

displayed: Press SAVE SCREEN to copy, CANCEL SCREEN to abort. If you press the Save Screen key,

the Saving user curves... message appears for a few seconds, then the display returns to the CURVE

ENTRY menu. If you press the Cancel Screen key, the curve is not copied and you are returned to the

CURVE ENTRY menu.

8.1.5 Front Panel Curve Erase

When curves are no longer needed, they can be edited over or erased. Curves erase sets all identification

parameters to default and blanks all breakpoint values.

To erase a curve, press the Curve Entry key. Press the Next Setting key until Erase curve is selected, then

press the Enter key. Change to the desired curve number with the s or t key, then press the Enter key. The

following message is displayed: Press SAVE SCREEN to erase, CANCEL SCREEN to abort. If you press

the Save Screen key, the Saving user curves... message appears for a few seconds, then the display

returns to the CURVE ENTRY menu. If you press the Cancel Screen key, the curve is not erased and you

return to the CURVE ENTRY menu.

Name:

SN:

Limit:

Format:

Coeff:

DT-470

D20496

499.900

V/K

Neg.

(I)In s e r t

Sensor

0.09062

0.10191

0.11356

0.12547

0.13759

(D )D e le t e

Temp(K)

475.000

470.000

465.000

460.000

455.000

Edit Curve: #23