Lakeshore Learning Materials 647 User Manual

Page 42

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Lake Shore Model 647 Magnet Power Supply User’s Manual

Remote Operation

4-12

4.3.1.1 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 +72 A.

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 +72 A.

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 ±72 A.

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 ±72 A.

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 ±72 A.

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.

OVP?:

Overvoltage (Quench) Protection Circuit Status Query

Input: OVP?

Returned: 0 if the circuit is inactive, or 1 if it is active.

Remarks: One character plus up to two terminators are returned.

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