Lakeshore Learning Materials 622 Uživatelský manuál stáhnout pdf (Strana 78)

Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual

Options & Accessories

6-10

When PSH is ON, the MPS compares the present

current setting with the current setting stored when

PSH was OFF. If the two do not match, the MPS

sounds the alarm for ½ second and displays:

Press a Data Entry up or down arrow to turn ON the

PSH. If Esc is pressed, or no key is pressed for

approximately 30 seconds, the PSH is not turned

ON.

6.3.3 Model 6228-8MUX Operation

The 6226-8MUX is a persistence card with a

multiplexed output. The output specifications are the

same as the single 6228 option card. The heater

supply current connects to one of eight persistence

heaters. The PSH SETUP screen displays an

additional line indicating the channel active if the

heater is turned on. To change channels, access

the PSH SETUP screen, move the cursor to the

CHANNEL line, and use the Data Entry up and

down arrows to increment to the desired channel.

Select Channel 0 to force the heater off.

If the heater is on and connected to a channel,

changing channels may cause problems. A warning

displays to prevent a mishap.

The Normal Manual screen shows which channel

connects to the heater when the heater turns on

(persistence off). When a zero displays, the heater

is off and not connected to any of the multiplexed

outputs. When a 1 through 8 displays, then that

multiplexed channel is controlled.

The magnet is put in and taken out of persistence via the last line on the Normal Manual Screen as with the

6228 PSH card. To change the channel number, access the Normal Manual Screen, use the Right/Left Cursor

to move to the channel number, and then use the numerical keypad entry keys. The data Entry up or down

arrow toggles the persistence on and off.

The Automatic Mode shown to the right allows

channel selection on line 7 prior to running the

Automatic change of persistence current.

To change the channel number on the Automatic

Screen, use the Right/Left Cursor to move to the

channel number, and then use the numerical

keypad entry keys. The Data Entry up or down arrow

does

not toggle persistence on and off. Persistence toggles on and off automatically.

6.3.4 PSH Card Voltage Constraints

The PSH (Persistence Switch Heater) card of the MPS supplies a current to a resistance heating element to

"normal" a persistence wire opening the ends of a supercooled magnet to enable charge (current) change.

Program current from 0 to 124 mA through the PSH Setup screen. Three conditions must be met when

selecting an appropriate current:

1. The current must be enough to "normal" the switch element. The magnet manufacturer specifies this

current and the heater resistance. This current must fall between the two following extremes.

2. The selected current multiplied by the heater resistance (e = i

× r) must be greater than 0.65 Vdc for the

MPS to accurately determine switch status when heated. If less than 0.65 Vdc, the MPS may not properly

report switch mode.

CAUTION! SETTING NOT SAME AS SAVED VALUE

LAST PERSISTENCE CURRENT :

PRESENT SUPPLY CURRENT :

ENTER KEY TO CHANGE TO LAST PERSISTENCE

CURRENT, WAIT RUNUP DELAY, THEN TURN OFF.

¥ KEY TO TURN OFF AT PRESENT CURRENT.

Esc KEY TO ABORT.

HEATER CURRENT: 50 mA

10.000 A

5.000 A

OUTPUTS: *

+2.000A

+1.000V

SETTINGS:

+2.000A

COMPLIANCE

RAMP RATE

RAMP ENABLE

¤CH 1,PERS.

:+ 5.000V

:+ 1.000A/S

: <OFF> ¥

: <ON> ¥

PERSISTENCE HTR SETUP:

¤HEATER

STATUS

LAST END

CHANNEL

OUTPUTS: *

+2.000A

: 50 mA

: <HTR ON>

: + 0.000A

: 1 ¥ +0.000V

PERSISTENCE HTR SETUP:

¤HEATER

STATUS

LAST END

THE HEATER IS ON.

CANNOT CHANGE CHANNEL

WITH THE HEATER ON.

Esc TO CONTINUE.

OUTPUTS: *

+2.000A

: 50 mA

: <HTR ON>

: + 0.000A

+0.000V

AUTOMATIC MODE:

¤MGT START

MGT END

MGT RATE

PERS RATE

LAST END

CH 1,PERS.

RUN ¥

OUTPUTS: *

+0.000A

: 10.000A

: 15.000A

: 1.000A/S

: 10.000A

: <ON>

+0.001V

STANDBY

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 89 90

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