User Manual

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19.2 Analog Inputs
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9.2.3 8938 FFT ANALOG UNIT
Accuracy at 23℃±5℃, 35% to 85%RH after zero adjustment after 60-minute warming-up time
Accuracy guaranteed for 1 year.
Number of channels 2 channels
Measurement ranges 5, 10, 20, 50, 100, 200, 500 mV/DIV, 1, 2, 5, 10, 20 V/DIV
DC amplitude accuracy ±0.4%f.s.
Zero position accuracy ±0.1%f.s.
Temperature characteristic Gain: ±0.025%f.s./℃, Zero position: ±0.02%f.s./℃
Frequency characteristic DC to 400 kHz ±3dB（DC coupling）
7 Hz to 400 kHz ±3 dB (AC coupling, low cut-off frequency: 7 Hz±20%)
Noise 500μVp-p(typ), 750μVp-p(max) (sensitivity range, with input shorted)
Common mode rejection ratio 80 dB min (at 50/60 Hz and with signal source resistance 100 Ω max)
Low-pass filter OFF, 5, 500, 5 k, 100 k±50%(Hz) -3 dB
Anti-aliasing filter Cutoff frequency (fc) 20, 40, 80, 200, 800, 2 k, 4 k, 8 k, 20 k, 40 k(Hz)
These frequencies are automatically set when the anti-aliasing filter is
set to ON. Attenuation characteristic: -66 dB, min. (at 1.5 fc)
Input type Unbalanced (input isolated from output)
Input resistance 1MΩ±1%
Input capacitance 30pF±10pF（at 100kHz）
Input coupling DC, GND, AC
A/D resolution 12 bits
Maximum sampling speed 1 MS/s (sampling period: 1 μs)
Input terminals Insulated BNC terminal
Maximum input voltage 400 V DC max
Maximum rated voltage to
earth
370 V AC/DC (between each input channel and main unit, and between
input channels)
Operational ranges for
temperature and humidity
Same as the MEMORY HiCORDER in which the 8938 is installed
Operating place Same as the MEMORY HiCORDER in which the 8938 is installed
Temperature and humidity
ranges for storage
Temperature: -10℃ to 50℃ (14
｡
F to 122
｡
F)
Relative humidity: 80%RH max (with no condensation)
Effect of radiated
radio-frequency
electromagnetic field
±2% f.s. at 3 V/m
Effect of conducted
radio-frequency
electromagnetic field
±28% f.s. at 3 V
Dielectric strength Between 8937 and main unit, between 8937 and input unit: 400 V AC fo
r
a minute
Dimensions / Mass Approx. 170 W×20 H×148.5 D mm (6.69" W×0.79" H×5.832" D mm)
(excluding projections)
Mass Approx. 290 g (10.2 oz)
Standard Applying EMC
Safety
EN61326, ClassA
EN61010
Pollution Degree 2, measurement category
(anticipated transient overvoltage 4000 V)