Hioki 8841 - 8938 Fft Analog Unit

406
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19.2 Analog Inputs
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19.2.3 8938 FFT ANALOG UNIT
Number of channels
2 channels
Measurement range
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./
o
C, Zero position:
±
0.02%f.s./
o
C
Frequency characteristic
DC to 400 kHz
±
3dB
（
DC coupling
）
7 Hz to 400 kHz
±
3dB
（
AC coupling, low cutoff frequency 7 Hz
±
20%
）
Noise
500
μ
Vp-p(typ.), 750
μ
Vp-p(max.) maximum 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,5,500,5k,100k
±
50%
（
Hz
）
-3 dB
Anti-aliasing filter
Cutoff frequency (fc) 20, 40, 80, 200, 400, 800, 2 k, 4 k, 8 k, 20 k, 40 k
(Hz) (auto setting when anti-aliasing filter on)
Attenuation: -66 dB min at 1.5 fc
Input type
Unbalanced (input isolated from output)
Input resistance and
capacitance
1M
Ω±
1% 30 pF
±
10pF
（
at 100 kHz
）
Input coupling
DC, GND, AC
A/D resolution
12 bits
Maximum sampling speed
1 MS/s (sampling period: 1
μ
s)
Input terminals
Insulated BNC terminal
Maximum input voltage
400 VDC max.
Maximum rated voltage to
earth
370 VAC/DC (between input channels and unit, between input channels)
Operational ranges for
temperature and humidity
Same as the MEMORY HiCORDER in which the 8938 is installed
Location for use
Same as the MEMORY HiCORDER in which the 8938 is installed
Temperature and humidity
ranges for storage
Temperature: -10 to 50
o
C (14
｡
Fto122
｡
F)
Relative humidity: 80%RH or less (with no condensation)
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
Dielectric strength
Between 8938 and main unit, between 8938 and input unit: 3.7 kVAC for a
minute
Dimensions / Mass
Approx. 170W
×
20H
×
148.5D mm (6.69"W
×
0.79"H
×
5.832"D)
Approx. 290 g (10.2 oz)
Standard Applying
EMC EN61326, Class A
Safety EN61010
Pollution Degree 2, measurement category
Ⅱ
(anticipated transient overvoltage 4000 V)
Accuracy at 23
o
C±5
o
C, 35% to 80%RH zero adjustment,
after 30-minutes warming-up time. Accuracy guaranteed for 1 year