Thermal Resistance Testers


LW-9091 CPU Cooler Thermal Resistance Measurement Apparatus & LW-9221 Multi-Axial Press Load Apparatus

LW-9091 CPU Cooler Thermal Resistance Measurement Apparatus & LW-9221 Multi-Axial Press Load Apparatus simulates a working condition for heat sinks. A controllable dummy heating module is behind the specimen as an IC, and an adjustable press load device is above the specimen as a fixture. By measuring the temperature points in the meter bar, the heat flux and the thermal resistance of specimens can be determined.

Experimental Items:


HEAT SINKS & CPU COOLERS
Tests:
  1. Temperature Points
  2. Heat Flux
  3. Thermal Resistance

Features

  1. Modified ASTM D 5470 standard
  2. Excellent reproducibility and repeatability
  3. Thermal resistance under different loading and temperature
  4. Measuring heating power Qh and Tc Temperature
  5. Automatic software controls designated testing conditions
  6. Automatic data acquisition by PC, and results are outputted and plotted as Excel files

LW-9091 CPU Cooler Thermal Resistance Measurement Apparatus

 

LW-9221 Multi-Axial Press Load Apparatus

                           

Principle


The meter bar is made of copper. Heaters are embedded at the bottom of the side of this meter bar. Thermal isolation material wraps this meter bar to reduce heat loss. In this meter bar, there are 3 temperature points, Tu, Tm, Tl. According to Fourier law, the heating power Q and the case temperature of meter bar Tc are determined as following:

X1: The distance between Tl and Tu, 50mm

A: The heat transfer are fo the meter bar, 25.4 x 25.4 mm2

Km: The thermal conductivity of the meter bar, 385 Wm/k

X2: The distance between Tcase and Tu
Simplified formula as following:

Example

LW-9091 Calibration Test Report

Temperature Meter Calibration Test Report:
Apparatus: Agilent 34970A

Ambient Temperature

Dry Bulb Temp.Wet Bulb Temp.Relative HumidityBarometric Pressure
CelsiusCelsius%mmHg
17.413.866.5742.2

Thermal Balance at Low Temperature

 TLTmTuTa
CelsuisCelsiusCelsiusCelsius
Standard17.2017.2017.2017.20
Measured17.2117.2217.2117.30
Bias0.010.020.010.10

Thermal Balance at High Temperature

 TLTmTu
CelsiusCelsiusCelsius
Standard110.00110.00110.00
Measured110.01110.02110.01
Bias0.010.020.01
Bias = Standard – Measured
Apparatus: Load Cell 100kg

Ambient Temperature (Load Cell)

Dry Bulb Temp.Wet Bulb Temp.Relative HumidityBarometric Pressure
CelsiusCelsius%mmHg
17.413.866.5742.2

Test Results (Load Cell)

 StandardMeasuredBias
KgKgKg
55.015.020.01
1010.0510.060.01
2020.2020.210.01
3030.0030.000
4040.0140.010
5050.0250.020
6060.0560.060
7070.0370.030
8080.0380.04-0.01
9090.0590.06-0.01
100100.10100.110.01
Bias = Standard  – Measured

Specifications

LW-9052 Press Load Apparatus:

  1. Press Force Range: 0 ~ 100 kgf
  2. Press Setting: Manual Control
  3. Maximum Loading Displacement: 20 mm
  4. Maximum Unloading Displacement: 150 mm
  5. 4-Shaft Press Load Exerting Mechanism, which can be adjusted on different position on the fan. Effective Area: 240 x 150 mm

LW-9053 Heat Module:

  1. 1 Point of T-Type for Ta and 3 Points of PT-100 for meter bar, with RS-485 interface
  2. 1 Set of Power Supply, DC 180 W for Heating
  3. 1 Set of Power Supply, DC 90 W for Fan’s Power
  4. Heater: 180 W
    • The actual power depends on capability of the heat sink under test
  5. Cross size of meter bar: 25.4 x 25.4 mm
  6. RPM measurement: FG signal

LW-9091 CPU Thermal Resistance Measurement Apparatus

  1. Press Load Range: 0 ~ 100 kgf
  2. Max. Heating Temperature: 150 degrees C
  3. Max. Heating Power: 150 W
  4. Chamber Temperature Range: Ambient +3 ~ 50°C
  5. Data Acquisition Channels: 30 in Rs -485 and 2 in D/A
  6. Overall Dimensions: 1.36 (W) x 0.84 (D) x 1.6 (H) m
  7. Power Source: AC220V, 5 Amp, Single phase

LW-9221 Multi-Axial Press Load Apparatus

  1. Press Load Range: 0 ~ 100 lb, with digit display
  2. Press Load Exerting: Manually
  3. Contact Type: Single Point
  4. Press Load Structure: Cantilever-type connecting rods, 2 sets
  5. Communication Interface: RS-485

Reserve Laboratory:

Please let us know the date, time and apparatus you would like to reserve or if you have any other questions about our machines.

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