5.2.3 8938 FFT ANALOG UNIT
Number of input channels 2
Measurement ranges 10, 20, 50, 100, 200, 500 mV/DIV
1, 2, 5, 10, 20, 50 V/DIV
DC amplitude accuracy ±0.4% f.s.
Zero position accuracy ±0.1% f.s. (after zero adjustment)
Temperature characteristic Gain: ±0.025%f.s./℃
Zero position: ±0.02%f.s./℃ (after zero adjustment)
Frequency characteristic DC to 400 kHz ±3 dB (DC coupling)
7 Hz to 400 kHz ±3 dB (AC coupling, low cut-off frequency: 7 Hz±20%)
Noise 500 μVp-p typical, 750 μVp-p max. (sensitivity range, with input
shorted)
Common mode rejection ratio 80 dB minimum (at 50/60 Hz and with signal source resistance 100 Ω
maximum)
Low-pass filter OFF, 5, 500, 5 k, 100 k ±50% (Hz) -3 dB
Anti-aliasing filter Cutoff frequency (fc) of 20, 40, 80, 200, 400, 800, 2 k, 4 k, 8 k, 20 k,
40 kHz (selected automatically with anti-aliasing filter ON)
Attenuation is -66 dB min. at 1.5 fc.
Input type Unbalanced (floating)
Input coupling DC, GND, AC
Input resistance 1MΩ±1%
Input capacitance 30 pF±10 pF (at 100 kHz)
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 maximum (with no condensation)
Dielectric strength One minute at 3.7 kVAC between the 8938 and the main unit, and
between the 8938 and the input unit
Dimensions Approx. 170W×20H×148.5D mm (6.69"W×0.79"H×5.85"D)
Mass Approx. 290 g (10.2 oz.)
Effect of radiated radio-
frequency electromagnetic
field
±2% f.s. at 3V/m
Effect of conducted radio-
frequency electromagnetic
field
±28% f.s. at 3V
Standards applying EMC EN61326 ClassA
Safety EN61010
Pollution Degree 2, Measurement Category
(anticipated transient overvoltage: 4000 V)
Accuracy at 23℃±5℃ (73
F±9
F), 35% to 80%RH after zero adjustment after
30-minute warming-up time. Accuracy guaranteed for 1 year.
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