Lake Shore 625, User Manual

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Lake Shore Model 625 Superconducting MPS User’s Manual
Computer Interface Operation 5-11
Figure 5-5. Operational Error Status Register
5.1.4.3.3 Persistent Switch Heater Error Status Register Set
The PSH Error Status Register reports the following PSH error events: PSH short, PSH open circuit. Any or all of these
events may be reported in the standard event summary bit through the enable register, see Figure 5-2. The PSH Error
Status Register is the third value of the three values associated with the Error Status Registers. The Error Status Enable
command (ERSTE) programs the enable register and the query command (ERSTE?) reads it. ERSTR? reads and clears
the Error Status Register. The used bits of the Error Status Event Register are described as follows:
PSH Short (PSS), Bit (1) – This bit is set if the persistent switch heater circuitry has detected a short circuit condition.
This can happen of the heater load falls below 10 Ω.
PSH Open (PSO), Bit (0) – This bit is set if the persistent switch heater circuitry has detected an open circuit condition.
Figure 5-6. PSH Error Status Register