User Manual

5.2 Analog Input Section
90
5.2.3 Model 8938 FFT Analog Unit
Temperature and humidity
range for guaranteed
accuracy
Period of guaranteed
accuracy
23 ±5°C(73±9°F), 35 to 80% RH (when zero adjustment is executed 30 minutes after
power on)
1 year
The number of input chan-
nels
2 channels
Measurement ranges 5 m, 10 m, 20 m, 50 m, 100 m, 200 m, 500 m, 1, 2, 5, 10, 20 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./°C
Zero position: ±0.02%f.s./°C (after zero adjustment)
Frequency characteristic DC coupling: DC to 400 kHz ±3 dB
AC coupling: 7 Hz to 400 kHz ±3 dB (low cut-off frequency: 7 Hz±20%)
Noise 500 μV p-p typ., 750 μV p-p max. (sensitivity range, with input shorted)
(S/N 2004-041132533 and later)
Common mode rejection
ratio
80 dB minimum (at 50/60 Hz and with signal source resistance 100 Ω maximum)
Low-pass filter OFF, 5±50%, 500±50%, 5k±50%, 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 kHz
(These frequencies are automatically set when the anti-aliasing filter is set to ON) Atten-
uation characteristic: -66 dB min. at 1.5 fc
Input type Unbalanced (input isolated from output)
Input coupling DC, GND, AC
Input resistance 1 MΩ±1%
Input capacitance 30 pF±10 pF (at 100 kHz)
A/D resolution 12 bits
Voltage axis resolution 80 points/div (with 1X magnification)
Maximum sampling rate 1 MS/s (sampling period: 1 μs)
Input terminals Insulated BNC terminal
Maximum input voltage 400 VDC
Maximum rated voltage to
earth
370 VDC (between each input channel and chassis, and between input channels)
Operating temperature and
humidity ranges
Same as the host Memory HiCorder
Storage temperature and
humidity ranges
-10 to 50°C (14 to 122°F), 80% RH or less (non-condensating)
Operating environment Same as the Memory HiCorder in which the 8938 is installed
Effect of radiated radio-
frequency electromagnetic
field
±2%f.s. at 3 V/m max.
Effect of conducted radio-
frequency electromagnetic
field
±28%f.s. at 3 V max. (100 mV/div with 1 V DC input)
Dielectric strength 3.7 kVAC for 1 minute (between input module and chassis, and between input modules)
Dimensions Approx.170W x 20H x 148.5D mm (6.69”W x 0.79”H x 5.85”D)(sans protrusions)
Mass Approx.290g (10.2 oz.)
Applicable Standards
Safety
EMC
EN 61010 Pollution degree 2,
Measurement category II (anticipated transient overvoltage 4000 V)
EN 61326 Class A