Owner manual

Rev. 5 55
Operation
Setup Menu : Load
heater; the magnet current is changed back to zero during this
process.
4. 5 mA is added to the current that was present during the
superconducting to resistive transition and that value of current is
displayed.
Note
If the PSw current determined by this method is accepted as
described below, the magnet will be in the heated switch mode at
zero amps being delivered to the magnet.
5. If the
ENTER key is pressed, the determined value of PSw current
is stored in the Model 430 Programmer. If the escape key is
pressed, the value determined in step 4, above is discarded and the
previously set persistent switch current is retained.
3.10.2.8 PSwitch Current
The persistent switch heater current can be set to any value
between 0.0 and 125.0 mA. The value can be set by using either the
numeric keypad per section 3.3 on page 25 or the fine adjust knob
(section 3.4 on page 26). The default value is 10.0 mA unless preset
by AMI to match a specific superconducting magnet.
3.10.2.9 PSwitch Heated Time
The persistent switch heated time is the amount of time required
for the persistent switch to heat completely and become fully
normal (resistive). The time may be set to any value between 5 and
+2.00 A P PSwitch Current Detect(mA)
+0.50 Vs Detecting...(20.7mA)
+00.00 A P PSwitch Current Detect(mA)
+0.50 Vs 37.2
+50.00 A — PSwitch Current (mA)
+0.50 Vs 10.0
+50.00 A — PSwitch Heated Time (sec)
+0.50 Vs 20