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19.2 Analog Inputs
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19.2.7 8947 CHARGE UNIT
Number of input channels
2 channels (switching)
Any of the following can be selected: Charge input, input from preamp,
voltage input or individual channels
Input type
Unbalanced input (floating between inputs, floating between input and unit
ground, common ground between voltage input and charge input )
Zero position setting range
-50 to 150%f.s. (when vertical axis (×1) display)
Common mode rejection
ratio
80 dB minimum (at 50/60 Hz and with signal source resistance 100 Ω
maximum)
Anti-aliasing filter
Cutoff frequency (fc) 20, 40, 80, 200, 400, 800, 2 k, 4 k, 8 k, 20 k, 40 k
(Hz) (ON/OFF, auto setting corresponding to the time axis and frequency
axis range) Attenuation: -66 dB min at 1.5 fc
Maximum sampling speed
1 MS/s
A/D resolution
12 bits
Operational ranges for
temperature and humidity
Temperature: 5
o
Cto40
o
C (41
｡
Fto104
｡
F)
Relative humidity: 35 to 80%RH maximum (Same as the MEMORY
HiCORDER in which the 8947 is installed)
Temperature and humidity
ranges for storage
Temperature: -10
o
Cto50
o
C (14
｡
Fto122
｡
F)
Relative humidity: 80%RH maximum (with no condensation)
Location for use
Same as the MEMORY HiCORDER in which the 8947 is installed
Effect of radiated radio-
frequency electromagnetic
field
±10% f.s. at 3 V/m (5 mV/DIV range)
Dimensions / Mass
Approx. 170W×20H×148.5D mm (6.69"W×0.79"H×5.85"D) (excluding
projections)
Approx. 310 g (10.9 oz)
Standard Applying
EMC EN61326, Class A
Safety EN61010
Pollution Degree 2, measurement categoryⅠ
(anticipated transient overvoltage 330 V)
Accuracy at 23
o
C
±
5
o
C, 35% to 80%RH after auto-balancing,
after 60-minutes warming-up time. Accuracy guaranteed for 1 year
■ General specification
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