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| Recorder Option (Input units for the MEMORY HiCORDER series) |
CHARGE UNIT 8947 |
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| Acceleration pickup and voltage input amplifier |
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The CHARGE UNIT 8947 is equipped with circuits for two independently usable input channels. As with previous analog units, simply slot the 8947 into the MEMORY HiCORDER for use.
- In addition to its charge input terminals, the 8947 is equipped with BNC terminals that support internal pre-amplifier pickup sensors
Not only ordinary piezoelectric acceleration pickups, but voltage output acceleration pickups with internal pre-amplifiers can be connected directly to the 8947, which supplies a constant current power supply for pre-amplifier operation.
- Accommodates voltage signal inputs
In addition to acceleration pickup signals, the 8947 can also measure ordinary voltage signals.
- Internal anti-aliasing filter
The 8947 is equipped with an anti-aliasing filter that is indispensable when performing FFT analysis on vibration waveforms.
- The 8947 can be used for the following applications:
Measuring engine vibration, Measuring brake vibration, Measuring pump vibration, Measuring bearing vibration, Measuring vibration of vibrators in cellular telephones, CD player vibration testing ... and other types of vibration endurance testing |
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| Basic specifications |
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| Input |
Number of channels: 2, Measurement objects can be selected individually for each channel. Full isolation between inputs, and between inputs and recorder. Common GND for voltage input and charge input channels.
Voltage and pre-amplifier internal inputs: BNC terminals
Charge input: miniature connector (#10-32 UNF) |
| Suitable converters |
Charge input: piezoelectric charge output acceleration pickup sensors
Internal pre-amplifier input: acceleration pickup sensors with built-in pre-amplifier |
Measurement ranges
Charge input (miniature connector)
Pre-amplifier internal input (BNC terminal) |
50 m (m/s 2)/DIV to 10 k (m/s 2)/DIV, 12 ranges x 6 types, Measurement resolution is 1/80 to 1/32 of range (change according to measurement sensitivity), Measurement sensitivity: 0.1 pC to 10 pC/ (m/s 2), Pre-amplifier internal input measurement sensitivity: 0.1 mV to 10 mV/ (m/s 2)
* When attached to recorder where full-scale (f.s.) = 20 divisions
100 m (m/s 2)/DIV to 20 k (m/s 2)/DIV, 12 ranges x 6 types, 1/160 to 1/64 of range, Measurement sensitivity: 0.1 pC to 10 pC/ (m/s 2), Pre-amplifier internal input measurement sensitivity: 0.1 mV to 10 mV/ (m/s 2)
* When attached to recorder where full-scale (f.s.) = 10 divisions
Amplitude accuracy: ±2 % f.s. Frequency characteristics: 1 to 50 kHz +1/-3 dB
Low-pass filter: 500/5 kHz Pre-amplifier driving power supply: 2 mA ±20%, +15 V ±5%
Highest input charge : ±500 pC (high sensitivity side 6 ranges), ±50000 pC (low sensitivity side 6 ranges) |
Measurement ranges
Voltage input (BNC terminal) |
500 µV to 2 V/division, 12 ranges, Measurement resolution is 1/80 to 1/32 of range (change according to measurement sensitivity) * When attached to recorder where full-scale (f.s.) = 20 divisions
1 mV to 5 V/division, 12 ranges, 1/160 to 1/64 of range * When attached to recorder where full-scale (f.s.) = 10 divisions
DC amplitude accuracy: ±0.4 % f.s. Frequency characteristics: DC to 400 kHz +1/-3 dB
Low-pass filter: 5/500/5 k/100 kHz Input coupling: DC, AC, GND
Max. allowable input: 30 V rms or 60 V DC |
Common functions
to all measurement ranges |
Anti-aliasing filter: can be turned ON or OFF, cut off frequency is the time axis, connected and set automatically by the frequency axis range |
| Maximum sampling rate |
1 MS/s (simultaneous sampling of two channels) |
| Max. rated voltage to earth |
30 V rms or 60 V DC (upper voltage which when applied to input channel casing or between input channels does not damage them) |
| Accessories |
None * The input cord is optional |
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