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

Remote Operation

4-11

4.3.1 Operational Commands Description

Below is a list of MPS Operational Commands which configure the various functions.

ERR? Error Status Query

Input: ERR?

Returned: [OVP] [RI] [STEP]

Remarks: Returns 0 if the error is inactive or 1 if it is active. Returns three characters plus up to two

terminators.

IMAX Programs Upper Current Limit

Input: IMAX [current] where [current] = a value between 0 and +50 A (620), 0 and +125 A (622),

0 and +155 A (623), or 0 and +72 A (647).

Remarks: Programs the upper (soft) current limit of the MPS. Truncates the value to the 0.001 place. The

initial condition is +000.0000 A. The current limit is always forced to a plus. Setting is limited by

product limits. Control Bus inputs 4 places, display rounds to 0.01 or 0.001 place.

IMAX? Current Limit Query

Input: IMAX?

Returned: A number between 0 and +50 A (620), 0 and +125 A (622), 0 and +155 A (623),

or 0 and +72 A (647).

Remarks: Nine characters plus up to two terminators are returned. Value is shown as

a “+,” but applies to both positive and negative entries.

IOUT? (I?) Output Current Query

Input: IOUT? or I?

Returned: A number between 0 and ±50 A (620), 0 and ±125 A (622), 0 and ±155 A (623),

or 0 and ±72 A (647).

Remarks: Returns nine characters plus up to two terminators.

ISET (I) Enter Output Current

Input: ISET [current] or I [current] where [current] = a value between 0 and ±50 A (620),

0 and ±125 A (622), 0 and ±155 A (623), or 0 and ±72 A (647).

Remarks: Value is truncated to the 0.001 place. Initial condition is +000.0000 A. Setting is limited by

IMAX. Control Bus inputs 4 places, display rounds to 0.01 or 0.001 place.

ISET? Output Current Setting Query

Input: ISET?

Returned: A number between 0 and ±50 A (620), 0 and ±125 A (622), 0 and ±155 A (623),

or 0 and ±72 A (647).

Remarks: Returns nine characters plus up to two terminators.

IV? Output Summary Query

Input: IV?

Returned: [IOUT], [VOUT], [STB], [I MODE], [V MODE]

Remarks: Returns twenty-seven characters plus up to two terminators.

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Lakeshore Learning Materials 622 Uživatelský manuál Strana 49