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The 7400-S Series VSM has been discontinued. Please consider the 8600 Series VSM as an alternative.

7400-S Series VSM Specifications

7404-S

7407-S

7410-S

Magnet pole cap face diameter

50 mm (2.0 in)

APPLIED FIELD STRENGTH (±1%)

Room temperature

3.5 mm (0.14 in) sample access

2.63 T

3.05 T

3.42 T

10 mm (0.4 in) sample access

2.27 T

2.72 T

3.16 T

16 mm (0.64 in) sample access

1.94 T

2.46 T

2.92 T

With oven or cryostat option

6.4 mm (0.25 in) sample access

1.49 T

2.12 T

2.59 T

With single-stage variable temperature option

6.4 mm (0.25 in) sample access

1.75 T

2.28 T

2.76 T

MOMENT MEASUREMENT

Noise floor (emu RMS)

Room temperature

0.1 TC; 0.1 s/pt
(no averaging)

450 nemu

0.1 TC; 1 s/pt

175 nemu

0.1 TC; 10 s/pt

60 nemu

With oven or cryostat option,
0.1 TC, 10 s/pt

2.5 µemu

With single stage variable
temperature option 0.1 TC, 10 s/pt

1.25 µemu

With vector option 0.1 TC, 10 s/pt

5 µemu

Dynamic range

1 × 10^-7 to 10³ emu

Time constants (TC)

0.1, 0.3, 1.0, 3.0, or 10.0 s

Moment stability¹

Less than 0.05% RMS of full scale/day at constant field, constant temperature, and highest range after a 5 h warm-up period

Reproducibility

Better than ±0.5%, or ±0.1% of full scale, fixed rotation angle and range, with sample replacement

Moment accuracy

Better than 1% of reading ±0.2% of full scale with a geometrically identical test sample and calibrant

Sample mass

0 to 10 g (higher mass can be accommodated with decreased performance)

FIELD MEASUREMENT

Field accuracy

1% of reading or ±0.05% of full scale

Field resolution

2800 kA/m (35 kOe)

8 A/m (0.1 Oe)

280 kA/m (3.5 kOe)

0.8 A/m (0.01 Oe)

28 kA/m (350 Oe)

0.08 A/m (0.001 Oe)

Closed loop field control stability

<0.05% RMS of full scale/h

MANUAL ROTATION

Setting resolution

<1°

Setting reproducibility

<1°

Rotation range

0 to 730°

CERTIFICATIONS

yes

Application of Council directives

2006/95/EC LVD
2004/108/EC EMC

Standard to which conformity is declared

EN-61010-1:2010 - Overvoltage II, Pollution Degree 2 - LVD
EN 61326-1:2013 - Class A, Annex B - EMC

UTILITIES

Total system cooling water power dissipation (50 or 60 Hz) — see available recirculating chillers

4.25 kW

13.4 kW

¹ Tested with an AlNiCo sample in a 1 in sensing coil gap after system warm-up period with the sample vibrating at field.
The AlNiCo samples’ moment must be >50% of full scale moment range.

7400-S Series VSM Equipment

	7404-S	7407-S	7410-S
VSM head drive	Model 740H
VSM frame	1
Control electronics	Model 736-S
Linear amplifier	Model 142
Bipolar magnet power supply	Model 643	Model 648
Mode	DC current source
Maximum output	±35 V/±70 A (2,450 W)	±75 V/±135 A (9.1 kW nominal)
AC line input	200/208 VAC ±10%, 13 A/phase; 220/230 VAC ±10%, 12 A/phase; 380 VAC ±10%, 7 A/phase; 400/415 VAC ±10%, 6.5 A/phase at 50/60 Hz	200 VAC ±10%, 41 A/phase; 208 VAC ±10%, 40 A/phase; 220 VAC ±10%, 38 A/phase; 230 VAC ±10%, 37 A/phase; 380 VAC ±10%, 23 A/phase; 400 VAC ±10%, 21 A/phase; 415 VAC ±10%, 21 A/phase
Cooling water requirements	Tap water or closed cooling system (optional chiller available) +15 °C to +25 °C	Tap water or closed cooling system (optional chiller available) +15 °C to +25 °C
Flow rate	5.7 L (1.5 gal)/min minimum	7.6 L (2.0 gal)/min minimum
Pressure drop	10 kPa (1.5 psi) at 5.7 L (1.5 gal)/min minimum for power supply only	159 kPa (23 psi) at 7.6 L (2 gal)/min minimum for power supply and mandatory flow switch
Electromagnet	Model EM4-HVA	Model EM7-HV	Model EM10-HV
Pole diameter	100 mm (4 in)	180 mm (7 in)	250 mm (10 in)
Pole cap face diameter	50 mm (2 in)	50 mm (2 in)	50 mm (2 in)
Field homogeneity	±0.1% over 1 cm³ (0.06 in³)	±0.1% over 1 cm³ (0.06 in³)	±0.1% over 1 cm³ (0.06 in³)
Cooling water requirements	Tap water or closed cooling system (optional chiller available)	Tap water or closed cooling system (optional chiller available)	Tap water or closed cooling system (optional chiller available)
Inlet temperature	15 – 25 °C (59 – 77 °F)	15 – 25 °C (59 – 77 °F)	15 – 25 °C (59 – 77 °F)
Flow rate	7.6 L (2 gal)/min	11.4 L (3 gal)/min	15 L (4 gal)/min
Pressure drop	200 kPa (30 psi)	250 kPa (36 psi)	200 kPa (30 psi)
Water chiller capacity	2.5 kW (8,530 BTU)/h	5 kW (17,060 BTU)/h	8.8 kW (30,035 BTU)/h
Hall probe	High sensitivity; 102 mm (4 in) aluminum stem		High sensitivity; 203 mm (8 in) aluminum stem
Pick-up coils	741SC and 741LC
Instrument console	483 mm (19 in) rack
Computer with IDEAS™ software	Model 740906

7400-S Series VSM Options Specifications

Model 74018 variable temperature cryostat
With LHe	Temp range	4.2 K (base), 5.5 K to 450 K (control)
	Temp stability	±0.1 K
With LN₂	Temp range	77.6 K (base), 85 K to 450 K (control)
	Temp stability	±0.2 K
Temperature resolution		0.001 K
Cool-down time		5 min (15 min initial cool-down)
Nominal ramp rate		Continuous flow
LHe liquid usage		<1 L/h when operating >7 K
LN₂ liquid usage		<1 L/h when operating >85 K
Insulation		Vacuum
Sample zone dimensions	Bore size	7.1 mm (0.28 in)
	Outside diameter	22.4 mm (0.88 in)
More information about VSM options

Model 74033 autorotation
Full range of rotation		-10 to 730°
Setting resolution		<1°
Setting repeatability		<1°
More information about VSM options

Model 74034 high temperature oven
Temperature range		303 K to 1,273 K
Temperature stability		±0.1 K
Temperature resolution		0.001 K
Maximum ramp rate		80 K/min at maximum heating rate of 80 W
Insulation		Vacuum plus multiple reflective shields
Sample zone dimensions	Bore size	7.1 mm (0.28 in)
	Outside diameter	19 mm (0.75 in)
More information about VSM options

Model 74035 single stage variable temperature option
Temperature range		78 K (base), 100 K to 950 K (control)
Temperature stability		0.1 K RMS when operated with argon (high temperature) and 0.9 K RMS when operated with nitrogen (low temperature)
Temperature resolution		0.001 K
Gasses		LN₂ and nitrogen gas for T<350 K; argon for T>350 K
Cool-down time		15 min from room temp to 100 K, 40 min from 950 K to room temp
Nominal ramp rate (in the domain)		5 K/min
Hold time		Continuous flow
LN₂ liquid usage		TBD
Nitrogen gas usage		3.2 L/min 100 K to 350 K
Argon gas usage		3.6 L/min
Insulation		Vacuum
Sample zone dimensions	Bore size	7.1 mm (0.28 in)
	Outside diameter	17.8 mm (0.7 in)
More information about VSM options

Model 74046 magnetoresistance (MR) probe
Number of probes		4
Probe pin to pin spacing		0.9 mm
Total 4-pin spacing		2.7 mm
Nominal sample size		4.5 mm × 4.5 mm cross-section, maximum height 3 mm
Temperature range		20 K to 673 K
Current ranges		6 ranges; 1 µA to 100 mA
Resistance ranges		9 ranges: 0.2 Ω, 2 Ω, 20 Ω, 200 Ω, 2 kΩ, 20 kΩ, 200 kΩ, 2 MΩ, up to 10 MΩ
Probe tip compliance voltage		0 V to 5 V, measurement 0 V to 100 V, contact formation
More information about VSM options

	7404-S or 7404	7407-S or 7407	7410-S or 7410
Model 74032XY standard vector coils²
Pole caps	100 mm (4 in)	100 mm (4 in)	100 mm (4 in)
Air gap	50.8 mm (2 in)	50.8 mm (2 in)	50.8 mm (2 in)
Maximum applied field	7.7 kOe (0.77 T)	12.5 kOe (1.25 T)	20 kOe (2.0 T)
RMS noise (Y coils)	5 µemu	5 µemu	5 µemu
Sample access	25 mm (1 in)
Torque density minimum (at maximum applied field)	38 × 10^-3 dyn•cm	62 × 10^-3 dyn•cm	60 × 10^-3 dyn•cm

² Requires large diameter pole caps; sold separately for 7400 Series systems

More information about VSM options