IM4830B Rev B
32
October 9, 2019
8.0
FAQ (Frequently Asked Questions)
Question
Can I charge the battery of the 4830B through it’s USB port by connecting it to my computer?
Answer
No. The 4830B battery can only be charged by connecting the included EHM2017 power supply to the charger
input socket
.
Question
I have a large number of channels to simulate. How many channels of signal conditioning/DAQ can be driven at
any one time with the 4830B?
Answer
For the charge outputs (SE & DIFF) it would be dependent on the input impedance of the particular signal
conditioner as multiple conditioners would reduce the effective impedance of the input. They would be in parallel,
so the more added would lower the impedance becomes and eventually it will load the charge output of the
simulator, just as it would an accelerometer. There is also the practical considerations of feeding one charge
source to multiple inputs whilst maintaining sufficient noise immunity / rejection.
The IEPE output is designed to sink the constant current from the signal conditioner in order to set the correct
operating bias, i.e. as an accelerometer would do. Connecting to multiple IEPE signal conditioner inputs is not a
practice that should be undertaken as damage to the unit and or the signal conditioner may occur. The
connection of a single IEPE type accelerometer to multiple signal conditioners is not something that would be
done in practice.
The mV and Tach outputs are a single ended low impedance outputs and are capable of driving multiple signal
conditioners. The exact number is again dependent on the loading presented by the type of voltage input
conditioner (input impedance).
To summarize, the 4830Bis only designed to simulate a single accelerometer and therefore the output is designed
for input into just one channel of a signal conditioner at a time. It is not recommended to“split” the signal across
multiple inputs as the unit is unlikely to perform within published specifications and worst case could be
damaged
.
Question
I’ve been unable to find the setting to tell the 4830B which output should be active(mV/IEPE, TACH, SE PE, DIFF
PE). Where can I set that?
Answer
The 4830B outputs are active across all outputs (mV/IEPE, TACH, SE PE, DIFF PE) simultaneously. Therefore, the
user does not need to “activate” a particular output.
