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.
