Lakeshore Learning Materials 622 - Manual (Page 74)

Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual
Options & Accessories 6-6
Look up the R
REF
/R
(T)
in Table 6-2 at the temperature of the sensor during measurement. Use the equation:
Ω
L
effective
R
L
R
R
T
active
REF
T
F
HG
I
KJ = ×
L
N
MM
O
Q
PP b g
b g
where L
active
is the sensor length (line 2). Enter the
computed value in line 4 manually.
Figure 6-1. NbTi Filament Resistance Chart
6.2.7 Model 6226/6476 IEEE-488 Remote Operation Commands
Cmd Function
BFLD? Magnetic Field Query
BUNI
Program Field Units
BUNI? Field Units Query
IBS? Field Summary Query
LALM Program Level Alarm
LALM? Level Alarm Query
Cmd Function
LALMS Program Level Alarm Status
LALMS? Level Alarm Status Query
LEVL Read
Level
LEVL? Level Query
LUNI Program Level Units
LUNI? Level Units Query
Cmd Function
PER
Program Sample Period
PER? Sample Period Query
ZREF Program Probe Zero Reference
ZREF? Probe Zero Reference Query
ZREFS Program Zero Reference Status
ZREFS? Zero Reference Status Query
BFLD? Magnetic Field Query
Input: BFLD?
Returned: A number between ±999.9999.
Remarks: Returns nine characters plus up to two terminators.
BUNI Program Magnetic Field Units
Input: BUNI [units] where [units] = kG for kilogauss, or T for tesla (10 kilogauss).
Remarks: The initial status is kG. Verify there is a space between the command and the units
parameter.
BUNI? Magnetic Field Units Query
Input: BUNI?
Returned: Either kG for kilogauss or T for tesla (10 kilogauss).
Remarks: Returns two characters plus up to two terminators.
Table 6-2. NbTi Filament Resistance Values
Temp. (K) Temp. (°C) Temp. (°F) R ref/R (T)
305.15
300.15
299.15
298.15
297.15
296.15
295.15
294.15
293.15
292.15
291.15
290.15
273.15
80.00
77.35
75.00
22.00
20.00
15.00
10.00
32.00
27.00
26.00
25.00
24.00
23.00
22.00
21.00
20.00
19.00
18.00
17.00
0.00
–193.15
–195.80
–198.15
–251.15
–253.15
–258.15
–263.15
89.60
80.60
78.80
77.00
75.20
73.40
71.60
69.80
68.00
66.20
64.40
62.60
32.00
–315.67
–320.44
–324.67
–420.07
–423.67
–432.67
–441.67
0.8401
0.8424
0.8428
0.8433
0.8438
0.8442
0.8447
0.8452
0.8456
0.8461
0.8466
0.8470
0.8550
0.9613
0.9630
0.9646
0.9973
0.9981
1.0000
1.0046