| Measurement type | AC, 4-lead differential, resistance |
| Number of inputs | 1; up to 16 with scanner |
| Measurement units | Ω, K (with temperature response curve) |
| Resistance ranges | 2 mΩ to 2 MΩ (excitation dependent) |
| Reading rate | 10 readings/s (same range and channel) |
| Range change settling | 3 s + filter settling |
| Channel change (scan) settling | 3 s + filter settling |
| A/D resolution | 24-bit |
| Input noise figure (370/3716) | 33 nV/vHz |
| Input noise figure (3708) | 2 nV/vHz |
| Measurement resolution | Range dependent, (see 370 performance specification table)
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| Accuracy | Range dependent, (see 370 performance specification table) |
| Measurement temp coefficient | (±0.0015% of reading ±0.0002% of range)/°C |
| Lead connections | V+, V-, l+, l-, V shield, l shield, individual guards |
| Scanner lead connections | V+, V-, l+, l- for each sensor, shield common to all |
| Max lead resistance | 100 Ω + 10% of resistance range per lead for current = 3.16 mA, 10 Ω + 10% of resistance range per lead for current = 10 mA |
| Input isolation | Measurement optically isolated from chassis ground |
| Common mode reduction | Matched impedance voltage input and current output, active CMR |
| Excitation type | Sinusoidal AC current source |
| Excitation frequency | 13.7 Hz (9.8 Hz and 16.2 Hz alternates) |
| Excitation currents | 21 ranges from 3.16 pA to 31.6 mA RMS |
| Minimum excitation power | 10-18 W into 100 kΩ (see 370 performance specification table) |
| Max DC current | 4 pA + 1% of excitation current (1.6 × 10-18 W into 100 kΩ) |
| Current protection | Current leads relay shorted on power-up and range change |
| Voltage ranges | 12 ranges from 2 µV to 632 mV RMS |
| Voltage over range | 20% nominal |
| Input impedance | Approaches 5 × 1012 Ω |
| Range selection modes | Manual, Voltage Excitation, Current Excitation, and Autorange |
| Scanner modes | Manual or Autoscan |
| Filter | Settling times 1 s to 200 s |
| Additional software features | Max/Min capture, Linear equation, user programmable pause on range and input change |
Temperature conversion |
| Supported cryogenic temperature sensors | Any resistive sensor including NTC resistors (e.g., germanium, carbon-glass, Cernox™, ruthenium oxide [Rox™]) and PTC resistors (e.g., rhodium-iron RTD) |
| Requirements | Requires calibrated sensor and a temperature response curve loaded into the instrument at Lake Shore or by the user |
| Temperature coefficient | Negative or positive |
| Temperature units | K |
| Low temperature | Below 20 mK in a well-designed system |
| Temperature resolution | Sensor and temperature dependent ( see sensor performance) |
| Curve memory | Space for twenty 200-point curves |
| Curve entry | Entered via front panel, computer interface, or CalCurve™ option |
| Curve format | Ω/K, Log Ω/K |
Temperature control |
| Control type | High resolution digital PID |
| Control modes | Closed Loop PID, Open Loop |
| Tuning modes | Manual PID, Zones |
| Setpoint units | Ω or K (with temperature calibration curve) |
| Setpoint resolution | Same as reading display resolution |
| Control stability | Below 10 mK p-p at 50 mK, system dependent |
| Heater output type | Variable DC current source |
| Heater output isolation | Optically isolated from chassis and measurement ground |
| Output D/A resolution | 18-bit |
| Heater output ranges | 100 mA, 31.6 mA, 10 mA, 3.16 µA, 1 µA, 316 µA, 100 µA , 31.6 µA |
| Heater output compliance | 10 V |
| Max power of output ranges | 1 W, 100 mW, 10 mW, 1 mW, 100 µW, 10 µW, 1 µW, 0.1 µW (nominal 100 Ω) |
| Heater type | Resistive |
| Heater resistance range | 1 Ω to 100 kΩ, 100 Ω for maximum power |
| Heater output gain accuracy | ±1% of setting |
| Heater output offset (at 0%) | ±0.02% of range |
| Max heater noise current | <0.005% of range |
| PID control parameters | | Proportional | 0.001 to 1000 | | Integral | 0 s to 10,000 s | | Derivative | 0 s to 10,000 s | | Manual output | 0% to 100% (resolution 0.001%) |
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| PID zone settings | 10 zones that include setpoint, heater range, PID, relays, and analog outputs (still) |
| Still output | Up to 1 W of power available using analog output 2 |
| Heater protection | Short circuit-protected, disabled with a relay on power-up, defaults to off range on power-up, selectable heater range limit, open circuit detection |
| Scanner support | Control with scanned input is supported with reduced stability |
Front panel |
| Display type | Graphic (8 line by 40 character) vacuum fluorescent display |
| Number of reading displays | 1 to 8 |
| Reading display units | mΩ, Ω, kΩ, MΩ, mK, K |
| Display resolution | 4, 5, or 6 digit, user selected |
| Display update rate | 2 readings/s |
| Reading display options | Ω, K, Max, Min, Linear |
| Other displays | Channel number, units, resistance range, excitation voltage or current, excitation power, control setpoint, heater range, and heater output |
| Display annunciators | Reading errors, CMR, Alarm, Ramp, Zone, Remote |
| LED annunciators | Autorange, Excitation Mode, Autoscan |
| Keypad | 36 key, numeric and specific functions |
Interface |
| IEEE-488.2 interface capability | SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1 |
| Software support | LabVIEW™ driver for IEEE-488 interface ( consult Lake Shore for availability) |
| Serial interface capability | RS-232C, DE-9 connector, 9600 baud |
| Alarms | | Number | Up to 32, high and low for each channel | | Settings | Source, High Setpoint, Low Setpoint, Deadband, Latching/Non-latching,
Audible on/off | | Actuators | Display annunciator, beeper, relays |
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| Relays | | Number | 2 | | Contacts | Normally Open, Normally Closed, and Common | | Contact rating | 30 VDC at 5 A | | Operation | Relays may be activated on high/low alarm setpoints or manually | | Connector | Detachable terminal block |
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| Analog voltage outputs | | Number | 2 | | Type | Variable DC voltage source | | Scale | User specified | | Range | ±10 V | | Resolution | 0.3 mV, 0.003% of full scale | | Accuracy | ±2.5 mV | | Maximum current | 100 mA | | Maximum power | 1 W | | Minimum load resistance | 100 Ω (short circuit-protected) | | Ground reference | Chassis | | Operation | Tracks reading, error (DR) using linear equation, or use as still heater | | Connector | BNC |
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| Monitor output | | Operation | User selects one of several analog voltage diagnostic points (must remain isolated) | | Connector | BNC |
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| Frequency reference | | Signal type | Phase sensitive detector reference (must remain isolated) | | Amplitude | 0 to +5 V nominal | | Waveform | Square wave | | Connector | BNC |
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General |
| Ambient temperature | 15 °C to 35 °C at rated accuracy; 5 °C to 40 °C at reduced accuracy |
| Calibration schedule | 1 year |
| Power requirement | 100, 120, 220, 240 VAC, +6% -10%, 50 or 60 Hz, 50 VA |
| Size | 435 mm W × 89 mm H × 368 mm D (17 in × 3.5 in × 14.5 in), full rack |
| Weight | 5.9 kg (12.9 lb) |
| Approval | CE mark |
3716 and 3708 scanners |
| Size | 135 mm W × 66 mm H × 157 mm D (5.2 in × 2.6 in × 6.2 in) |
| Weight | 1 kg (2.1 lb) |