Meggitt ENDEVCO 4830A User manual

4830A Accelerometer simulator
Instruction manual
IM4830A, Revision E1

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The ENDEVCO Model 4830A is a battery operated instrument that is used to electronically simulate a
variety of outputs from vibration transducers. Also provided is a tachometer output that provides a TTL level
output signal. The output signals can be set-up in actual pC or millvolts. All parameters are entered via a
front panel key pad that is sealed per IP65.
The following simulated sensor outputs are available from the Portable Simulator:
•Acceleration
•Displacement
•Velocity
•Tachometer
Output signals are provided that simulate voltage mode accelerometers (IEPE, ISOTRON, etc) and charge
mode accelerometers, both single-ended and differential types. While the 4830A provides an accurate and
repeatable signal, it is not a substitute for the manufactures recommended calibration intervals.
All units are provided with a padded carrying case, charger, snap-on filter for the battery charger and a
twinax BNC connector. Optional cables are available from Meggitt Sensing Systems. Please contact the
factory or your local representative/reseller for further information.
This manual covers the basic operation on the 4830A along with a section on servicing and calibration.

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1. POWER/CHARGE CONDITIONS
Power is provided by an internally mounted NI-CAD battery pack, which can be charged by
applying a regulated 9V D.C. source to the DC input connector. The 9V source will also provide all
the power required by the unit, reverting to battery power when the source is removed
The internal battery charger will complete a full charge within 4 hours, the battery management
system detects battery and ambient under/over temperature, cell voltage, fast charge time and
reverts to trickle charge when limits have been reached. There are two LED's provided to indicate
current status, power/trickle 'Charge and Fast Charge'.
To charge the 4830A switch the power switch on the unit to “1”, connect the power supply and
switch it on. The red “fast charge” and orange “trickle charge” LEDs should both be lit. Once the unit
is fully charged in the red, “fast charge” LED will extinguish. The orange “trickle charge” LED will
remain lit indicating that the battery voltage is being maintained / topped up by a trickle charge
current. This configuration is recommended for optimum charging of the unit.
A power low warning shown on the bottom line of the display and can be cleared by taking the
cursor position into the mode area i.e.: Hertz, but the message will be re-displayed in approximately
1 minute. Failure to charge will result in the unit powering down (display will blank) while retaining
the units last settings.
2. POWER MANAGEMENT
The unit will enter its 'Power Save' mode after approximately 5 minutes from the last keyboard
action. This can be disabled by depressing the left and right keys together, a message will be
displayed 'Auto-power down' and on releasing the keys a '*' symbol can be seen in the right-hand
bottom corner indicating the auto power down function is disabled.
NOTE: In this mode a significant reduction in battery operation times can be experienced, do not
leave unit on when not in use.
To enable 'Auto-Power shutdown' depress the left and right keys again on release the '*' symbol will
be removed, auto-power mode is now enabled.

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In power save mode the systems power supplies are shutdown inhibiting any signal output, power
to the display is maintained.
Auto power save mode will be reset by the next key press (display will blink and software issue text
will be displayed).
3. PARAMETER SETTINGS
Parameter selection setting is achieved using the four keys left, right, up and down, the display is
divided into two separate areas, on right hand side of the display is the 'mode' area, using the up
and down keys to scroll through the various available modes. The second line down is used for
editing the values of each parameter. Select which mode parameter to be edited by scrolling display
until it appears on the second line down. Using the left-hand key move the cursor until it is over the
digit that is to be modified, use 'up' to increase value, or down to decrease value, note that the
values either side will change when roll-over occurs depending on count up or down. The cursor
has to be returned to right-hand area to select a new parameter.
The signal outputs will update immediately to reflect the new value.
4. MEMORY RESET
To perform a 'Memory reset' depress the left and down keys simultaneously. On release a
'MEMORY RESET' message will be displayed, following a reset the factory default settings will be
loaded into the units memory.
5. POWER SUPPLY
The EHM1882 Power Supply and EHM1905 Ferrite Snap-On Cable Filter need to be assembled
prior to use. This is necessary so the 4830A meets specifications.
1. Remove power supply wrapping and extend the cord.
2. Remove the ferrite filters wrapping.
3. Open the ferrite filter by gently lifting on the two plastic latches.
4. Open the power supply’s cord starting about 1 inch from the end that plugs into the 4830A
and run it through the trough in the open filter as shown in Figure 1.
5. Keeping the cord from being pinched, close the ferrite filter until the plastic latch snaps shut.

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Figure 1: Install snap-on ferrite
Figure 2: Plug in power
6 PANEL DESCRIPTION AND ORENTATION
Please follow the step by step instructions for set up and operation of the instrument. Refer to figure
three for location on the output signal conditioners. The connectors provide the following outputs:
TACHO: Provides a simulated tachometer signal with TTL (5 Volt) pulses
ICP: Provides a millivolt output signal as selected on the panel. This output includes
current sinking to simulate IEPE (ISOTRON, ICP etc) accelerometers.
SE: A charge signal is provided to simulate charge-mode piezoelectric accelerometers.
mV: An output in millivolts may be selected with no current sinking.
DIFF: A Twin-BNC connector provides a differential charge to simulate differential charge-
accelerometers.

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The rear panel contains the power switch and charger input. The LED’s labeled F and C indicate
fast charge (F) and trickle charge (C). The charge mode is selected automatically based on the
charge level of the internal battery.

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7. BATTERY REPLACEMENT
In the event the battery requires replacement, it can be replaced with an Endevco model EBT26. It can be
installed by Endevco or the user can replace the battery. The battery is located in the upper right corner in
figure 3.
Below are step-by-step instructions to follow for replacing the battery:
1. Remove the four screws on the bottom of the instrument. These screws may be located under the
rubber feet.
2. Gently remove the top cover and the battery will be visible (see figure 3). The battery will lift out
since it is held in-place when compressed by the upper and lower case.
3. It is recommended that the wires be cut close to the battery leaving the other end of the wires
attached to the circuit board and plug. Strip the ends of the wire
4. Strip the ends of the leads on the new battery.
5. Solder the new battery leads to the leads that were left in the simulator. Cover the solder joint with
shrink tubing
6. Reassemble the case and check for proper operation.
8 CALIBRATION AND TESTING
Annual calibration is recommended to ensure accuracy and proper performance. Calibration service is
available from the factory, or the user can perform the calibration by following the following procedures.
8.1 Test Equipment
Unless otherwise stated, the following equipment is required. Items may be substituted with equipment of
similar performance.
•DC Power Supply, 9 Volts regulated. The power supply provided with the 4830A is preferred
•Oscilloscope
•Frequency counter
•RMS Voltmeter
•Isotron Signal Conditioner model 4416B
•Single/differential charge amplifier model 6634C
8.2 Testing
8.2.1 With the unit switched on, verify that the Battery Low message is not displayed. Use the 9 V
regulated power supply to recharge the batteries, if required. The procedure may be performed
with the power supply connected.
8.2.2 Turn the unit off and connect the 9 Volt power supply (note that the center pin is +). The unit should
automatically turn on with the power supply connected and charging the internal batteries. Verify
that the yellow LED charge indicator is lit when the power supply is connected.

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8.2.3 Depress the two left hand keyboard switches simultaneously to re-initialize the unit. Confirm the default
settings: Frequency = 100 Hz, Sensitivity = 10.0 and g = 10.0.
8.3 Frequency Accuracy
8.3.1 Connect the frequency counter to the “mV” output BNC connector. Set the 4830A sensitivity to
10.0 and the “g” level to 100.0. Measure and record the actual frequency output for the following
displayed frequencies: 1.0, 10.0, 100.0, 1000.0, and 10,000 Hz. Limits: ±1%.
8.3.2 Measure and record the actual frequency output for the following frequencies: 111, 222, 333, 444,
555, 666, 777, 888, and 999 Hz. Limits: ±1%.
8.3.3 Connect the frequency counter to the “TACH” output socket. Set the 4830A frequency to 100.0 Hz.
Measure and record the output frequency for the following “Ratio” settings; 1.0, 10.0 and 100.0.
Limits are ±1%.
Verify “Tach” Output is 5 Volts peak to peak
8.4 Amplitude Accuracy (mV OUTPUT)
8.4.1 Connect a true RMS voltmeter and an oscilloscope to the “mV” output socket. Set the 4830A
frequency to 100.0 Hz and the sensitivity to 10.0. Measure and record the mV output for the
following “g” levels; limits ±1%.
g Level
mV Output
Limits
10.0
70.7 mVrms
69.99 – 71.41
100.0
707.0 mVrms
699.9 – 714.1
1000.0
7070.0 mVrms
6999 - 7141
Note: Levels < 100 mV pk (70.7 mV Rms) will be affected by noise.
8.4.2 If the measurement results exceed the prescribed limits (see above table), re-adjust the
unit using the following method. Set conditions as per paragraph 8.3.1 and with the “g”
level set for 100.0. Adjust RV1 on the analog output board (see fig 3 for the location of
the potentiometer) ) to obtain 707.0 mVrms at the “mV” output socket.
8.4.3 Re-adjust the 4830A sensitivity to 1.0. Measure and record the mV output for the
following g levels; limits ±1%.
g Level
mV Output
Limits
111.0
78.49
77.71 – 79.27
222.0
156.98
155.4 – 158.6
333.0
235.47
233.1 – 237.8

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444.0
313,96
310.8 – 317.1
555.0
392.44
388.5 – 396.4
666.0
470.93
466.2 – 475.6
777.0
549.42
543.9 – 554.9
888.0
627.91
621.6 – 634.2
999.0
706.40
699.3 – 713.5

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Figure 3 showing the interior of the 8530A with the cover removed. RV1 is located behind
the vertical PC board. DO NOT ATTEMPT TO ADJUST THE THREE POTENTIOMETERS ON
THE HORIZONTAL BOARD. The battery is located on the right side (large blue item).
The battery will lift out and is held in-place by compression when the cover is replaced.
8.5 Amplitude Accuracy (IEPE, ISOTRON, ICP Output)
With the exception of the “Tach”, all other outputs of the 4830A are derived from the “mV” output.
To verify their operation, suitable calibrated signal conditioners should be used, e.g. for the IEPE
(Isotron) an Endevco 4416B, for an “S.E.”-and differential change, A Meggitt (Endevco)
Model 6634C.
8.5.1 Connect the True RMS Voltmeter and Oscilloscope to the output of the Isotron Signal Conditioner
Connect the True RMS Voltmeter and Oscilloscope to the output of the Signal Conditioner and
Verify the “Status” LED is lit. Set the signal conditioning gain to X1 and the 4830A sensitivity to 10.
Measure and record the 4416B for the following “g”settings. The limits are ±1.5%.

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g Level
mV Output
Limits
10.00
70.7 mVrms
69.64 –
71.76
100.0
707.0 mVrms
696.4 –
717.6
1000.0
7070.0 mVrms
6964 -
7176
8.6 Amplitude Accuracy (S.E. Charge Output)
8.6.1 Connect the “S.E.” Charge Output to the input of the Model 6634B Signal Conditioner. Set the
6634B for: Type = SEPE, Sens = 10.00, FS = 20.0, Mode = g, DC = pK and Filter = Out. Set the
4830 for a frequency of 100.0 Hz, Sens= 10.0 and g = 10.00. Record the displayed g level on the
6634B. Limits 9.8 to 10.2
8.6.2 Re-adjust the 4830A for g = 100 and adjust the 6634B FS to 200. Record the displayed g level.
Limits 98 to 102.
8.6.3 Re-adjust the 4830A for g = 1 and adjust the 6634B FS to 2.00. Record the displayed g level.
Limits 0.98 to 1.02
8.7 Amplitude Accuracy (DIFF Charge Output)
8.7.1 . Connect the “DIFF.” Charge Output to the input of the Model 6634B Signal Conditioner. Set the
6634B for: Type = DIFF, Sens = 10.00, FS = 20.0, Mode = g, DC = pK and Filter = Out. Set the
4830 for a frequency of 100.0 Hz, Sens= 10.0 and g = 10.00. Record the displayed g level on the
6634B. Limits 9.8 to 10.2.
8.7.2 Re-adjust the 4830A for g = 100 and adjust the 6634B FS to 200. Record the displayed g level.
Limits 98 to 102.
8.7.3 Re-adjust the 4830A for g = 1 and adjust the 6634B FS to 2.00. Record the displayed g level.
Limits 0.98 to 1.02.
8.8 A, V, and D (Acceleration, Velocity and Displacement)
8.8.1 Set the 4830A frequency to 61.4 Hz, Sens = 10.0 and g = 10.0. Verify that the following is
displayed: ms^2 = 98.0665 and ips = 10.00.
8.8.2 Re-adjust the frequency to 139.857 Hz. Verify the following display: mils = 10.000
8.8.3 Re-adjust the frequency to 22.289 Hz. Verify the following display: mm = 10.000 (fro Rev D4
firmware verify display reads: Tm = 10000.0).

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8.8.4 Re-adjust the frequency to 15.60 Hz. Verify the following display: m/s = 1.0000 (For rev D4
firmware verify that the display reads mm/s = 1000.0.
.
9.0 TROUBBLE SHOOTING GUIDE
a) Corrupted Display: If the display is corrupted (Due to low battery or transient power glitches). The
problem can generally be corrected by doing a “Memory Reset” as described in item 4. If the
problem persists, the unit is most likely defective.
10.0 TECNICAL SUPPORT
For technical assistance, contact the applications engineering department at Meggitt Sensing
Systems or your local representative or international distributor.
Questions
If you have any questions regarding the use of this or any Endevco product, please contact Endevco
Application Engineering at 1-800-982-6732 in North America, or your local sales representative.