IM4830B Rev B
12
October 9, 2019
Figure 9: About screen
3.6.
Power
The simulator is primarily a battery powered instrument. Power comes from an internal rechargeable Li-
on cell pack. A universal power adapter is supplied with the simulator which can be used to charge the
internal battery or to power the simulator from an AC outlet. Note: When charging the battery with the
simulator turned on, power is shared with the effect of increased charging times. To prolong the life of the
internal battery it is recommended that the charger is unplugged from the simulator once the charge
indicator has extinguished. See section 4.13for further details on charging.
3.6.1.
Low battery indicator
The low battery indicator will appear on the right side of the display screens as shown below. When
the indicator appears the user has approximately 10 minutes of useable time remaining before the
simulator turns off.
Figure 10: Low battery indicator
3.6.2.
Battery charge indicator
The charge indicator is located on the base of the simulator above the DC power jack socket. In the
fast charge state the indicator flashes green. In the trickle charge mode the indicator will be a
solid green for approximately 45 minutes. A red indication means a fault has been detected.
3.7.
Output types and typical connection configurations
The simulator provides AC output signals that mimic those of charge mode piezoelectric (PE)
accelerometers (both single ended and differential configurations) and voltage mode piezoelectric
accelerometers - often referred to generically as IEPE accelerometers (Integral Electronics Piezoelectric).
Outputs are provided in the form of pC (Pico coulomb) or mV (millivolt) signals as appropriate.
IEPE accelerometers have an output where the AC vibration signal is superimposed upon a DC bias level.
The DC bias level is typically in the range of 10 to 12V and is result of the constant current, normally in the
range of 2mA to 20mA, from the IEPE power supply. When in the IEPE mode, the simulator sinks the
constant current from the power supply and sets a DC bias of approximately 10.5V which is required for
correct operation by most IEPE signal conditioners.
The simulator is thus compatible with signal conditioning equipment such as charge amplifiers, remote
charge converters, IEPE power supplies and IEPE signal conditioners. In addition the simulator may also
be compatible with conditioners requiring a simple, unbiased mV input signal.
