American Magnetics 430, Инструкции по установке, эксплуатации и обслуживанию

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230 R
EV
9
A
MERICAN
M
AGNETICS
, I
NC
. A
PPENDIX
: S
HORT
-S
AMPLE
M
ODE
10,000 is
required
for the sample voltage signal connected to Auxiliary Input
2 in Short-Sample Mode.
20
NOTE
The sample voltage must be connected to the Auxiliary Input 2 for
the sample quench detection feature to function. Sample quench
detection is defined as a sample current magnitude greater than
90 microvolts. The quench threshold of 90 microvolts is a fixed
internal parameter.
• The custom Supply parameter “V-V Mode Input Range” is changed to “V-I
Mode Input Range” to reflect voltage-commands-current operation of a con-
nected power supply.
• The Load submenu of the Setup menu is limited to four parameters: Stability
Setting, Current Limit, Sample Voltage Null, and Sample Quench Detect.
A Stability Setting of 0% is recommended for Short-Sample Mode unless
otherwise directed by an AMI Technical Support Representative.
The Current Limit in this context refers to the maximum allowable current
through the short-sample under test.
The Sample Voltage Null feature when exercised will quickly average several
sample voltage (Vss) measurements and determine an offset to apply to the
sample voltage to report 0 Volts for the
Vss
display and remote query.
This
offset is not saved between power cycles
of the Model 430 and may be exer-
cised as many times as desired to null out sample voltage offsets.
• The following remote commands and queries generate the error:
-109,”N/A in present mode”
when the Model 430 is operating in Short-Sample Mode
:
CONFigure:VOLTage:LIMit
CONFigure:COILconst
CONFigure:RAMPDown
(all subcommands)
CONFigure:RAMP:RATE:FIELD
CONFigure:FIELD:UNITS
CONFigure:PSwitch
(all subcommands)
20. AMI offers an external low-noise amplifier to scale microvolt sample voltages to a range that
can be read by AUX Input 2.
+50.00 A — Status: Holding
+24.53 Vss
Short-Sample Mode
+50.00 A — Sample Voltage (Vss) Null
+24.53 Vss
Press ENTER to Zero Vss