Lakeshore 425 - Computer Interface; Model 425 Rear Panel; Hall Probe Selection; Axial Probes

4 cHAPTER 1: Introduction
Model 425 Gaussmeter
1.4.4 Computer
Interface
The Model 425 is equipped with a universal serial bus (USB) interface. It emulates an
RS-232C serial port at a fixed baud rate of 57,600, but with the physical connections
of a USB. In addition to gathering data, nearly every function of the instrument can be
controlled through the USB interface. The reading rate over the interface is nominally
30 readings per second. A LabVIEW™ driver is available from the download section of
the Lake Shore website at www.lakeshore.com.
1.4.5 Model 425 Rear
Panel
1.5 Hall Probe
Selection
Listed below are the probes that you can choose from to include with your Model 425.
Our experts can guide you through the probe selection process. Other standard
probes are available at an additional cost. Lake Shore prides itself on making every
attempt to satisfy customer requests for special probes. If you need a custom probe,
contact Lake Shore for availability.
1.5.1 Axial Probes
FIGURE 1-4 Model 425 rear panel showing the line input assembly,
USB interface, auxiliary I/O and the probe input
FIGURE 1-5 Axial probe
L (in) D (in) A (in)
Active area
(in)
Stem
material
Frequency
range
Usable full
scale ranges
Corrected
accuracy
(% rdg)
Operating
temp
range
Te m p
coefficient
(max) zero
Te m p
coefficient
(max)
calibration
HMNA-1904-VR 4 ±0.125
0.187 dia
±0.005
0.005
±0.003
0.030 dia
(approx)
Fiberglass
epoxy
DC to
10 kHz
HSE
35 G 350 G,
3.5 kG, 35 kG
±0.20% to 30 kG
and ±0.25% 30
to 35 kG
0 °C to
+75 °C
±0.09 G/°C -0.04%/°C
HMMA-2502-VR 2 ±0.063
0.25 dia
±0.006
0.015
±0.005
Aluminum
DC to
10 kHz
HMNA-1904-VF 4 ±0.125
0.187 dia
±0.005
0.005
±0.003
Fiberglass
epoxy
DC to
800 Hz
HST-4
350 G, 3.5 kG,
35 kG
±0.10% to 30 kG
and ±0.15% 30
to 35 kG
±0.13 G/°C -0.005%/°C
HMMA-2502-VF 2 ±0.063
0.25 dia
±0.006
0.015
±0.005
Aluminum
DC to
400 Hz
TABLE 1-1 Axial probe