5.2.4 8939 STRAIN UNIT
Number of input channels 2
Appropriate adapter Strain gauge adapter (bridge resistance: 120 Ω to 1 kΩ)
Bridge voltage 2±0.05 V
Balancing Electronic auto-balancing
Balance adjustment range ±10000με max.
Measurement ranges 50, 100, 200, 500, 1000, 2000 με/DIV
DC amplitude accuracy ± (0.5% f.s. + 2 με) (after auto-balancing)
Zero position accuracy ±0.5% f.s. (after auto-balancing)
Zero position setting range -50 to 150% of the recording width (in full-size representation of the
vertical axis)
Temperature characteristic Gain: ±0.05% f.s./℃ max. (after auto-balancing)
Zero position: ±2 με/℃ max. (50, 100 με/DIV ranges),
±0.1% f.s./℃ max. (200, 500, 1000, 2000 με/DIV ranges)
Frequency characteristic DC to 20 kHz +1/-3 dB
Low-pass filter OFF, 10, 30, 300, 3 k ±30% (Hz) -3 dB
A/D resolution 12 bits
Maximum sampling speed 1 MS/s (sampling period: 1 μs)
Maximum allowable input
voltage
10 V (DC+AC peak)
Maximum rated voltage to
earth
30 Vrms or 60 VDC
Operational ranges for
temperature and humidity
Same as the MEMORY HiCORDER in which the 8939 is installed
Operating place Same as the MEMORY HiCORDER in which the 8939 is installed
Temperature and humidity
ranges for storage
Temperature: -10℃ to 50℃
Relative humidity: 80%RH maximum (with no condensation)
Effect of radiated radio-
frequency electromagnetic
field
±5% f.s. at 3V/m
Dielectric strength One minute at 400 VAC between the 8939 and the main unit, and
between the 8939 and the input unit
Dimensions Approx. 170W×20H×148.5D mm (6.69"W×0.79"H×5.85"D)
Mass Approx. 250 g (8.8 oz.)
Standards applying EMC EN61326 ClassA
Safety EN61010
Pollution Degree 2, Overvoltage Category
(anticipated transient overvoltage: 330 V)
Accessories Conversion cable × 2 (Compatible sensor connector: PRC03-12A10-
7M10.5 by TAJIMI)
Accuracy at 23℃±5℃ (73
F±9
F), 35% to 80%RH after carrying out auto-
balancing after 60-minute warming-up time. Accuracy guaranteed for 1 year.
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