Metrix 6850-001 User manual

6850-001 Impact Meter
Installaon Manual
DOC# 100850 • REV B (April 2018)
6850 connected
to an IT6810
The 6850 Impact Meter is designed for quick
check out or adjustment of Metrix Impact
transmiers, either on an operang ma-
chine, or with the transmier removed.
Simply connect the Meter to an Impact
transmier, toggle the Power switch, and
select Pulse-Time, 4-20mA, or Peak Detect
mode. In Pulse-Time mode, the transmit-
ter’s Threshold level (milli-volts), and Sam-
ple Time (seconds) are displayed, and may
be adjusted while observing the changes.
Switching to 4-20mA mode displays the
current output directly, while Peak Detect
mode displays the peak vibraon level, in
milli-volts, detected by the transmier.
The Peak Detect mode is provided for
measuring and displaying the amplitude of
Impact peaks present at the measurement
locaon. Peak Detect mode is most useful
when “ne tuning” a transmier for a par-
cular machine. An Impact Threshold Level
2X to 3X the base line PD level has proven to
provide good machinery protecon moni-
toring. While the Pulse Time is a funcon
of machine operang speed, calculated as
follows: 960 divided by machine RPM = the
Pulse Time (in seconds).
OVERVIEW

Doc# 100850 • REV B (April 2018) Page 2 of 8
FEATURES
• Display peak amplitude of Impacts within machine
• Display transmier’s Impact “Threshold level”
• Display transmier’s Impact “Pulse Time”
• Display transmier’s 4-20mA output
• Waveform access through BNC connector
• Powers IT6810, IT6811 and IT6812 during setup & checkout
• Select transmier’s Pulse-Time, 4-20mA, or Peak Detect mode
• Baery powered, digital display
BENEFITS
• One device for transmier checkout & setup
• Eliminates need for oscilloscope & voltmeters
• Simple to operate for task eciency
6850 OPERATION / OPERATING MODES
The 6850 Impact Meter is designed for quick check out or adjustment of Metrix Impact
transmiers, either on an operang machine, or with the transmier removed.
Simply connect the Meter to an Impact transmier, toggle the Power switch, and select Pulse-
Time, 4-20mA, or Peak Detect mode. In Pulse-Time mode, the transmier’s Threshold level
(millivolts), and Sample Time (seconds) are displayed, and may be adjusted while observing
the changes. Switching to 4-20mA mode displays the current output directly, while Peak De-
tect mode displays the peak vibraon level, in milli-volts, detected by the transmier.
The Peak Detect mode is provided for measuring and displaying the amplitude of Impact
peaks present at the measurement locaon. Peak Detect mode is most useful when “ne
tuning” a transmier for a parcular machine. An Impact Threshold Level 2X to 3X the base
line PD level has proven to provide good machinery protecon monitoring. While the Pulse
Time is a funcon of machine operang speed, calculated as follows: 960 divided by ma-
chine RPM = Pulse Time (seconds).

Doc# 100850 • REV B (April 2018) Page 3 of 8
USING THE IMPACT METER
The Impact Meter is capable of taking Threshold, Pulse Time,
Loop Current, and Peak Detect measurements. Prior to taking
measurements with the Impact Meter, you must connect the
Impact Meter to your Impact Transmier device as shown in
Figure 1.
Next, momentarily toggle the Power switch to the ON/OFF
posion. This will inialize the Impact Meter to start making
the desired measurement.
Threshold/Pulse Time Measurement
To inialize the Threshold/Pulse-Time measurement mode,
set input switch 2 to Threshold, Pulse-Time, Peak Detect and
input switch 3 to T/PT as shown in Figure 2.
NOTE: During inial power on of the Impact Meter, it may
be necessary to wait up to 10 seconds for the Threshold and
Pulse-Time measurements to stabilize.
Figure 1
Figure 2
Figure 3
The Threshold/Pulse-Time measurement will congure the impact transmier in setup
mode. This mode will allow the Impact Meter to measure the Threshold and Pulse-Time
generated by the Impact Transmier. The Impact Meter will display the measured Threshold
in milli-volts and the Pulse Time in seconds as shown below in Figure 3. Refer to secon 5.3
and 5.4 of the IT6810/IT6811/IT6812 Impact Transmier Manual for more informaon on
how to set the threshold and pulse-me of the Impact Transmier.
Example of me waveform showing pulse level and me period (not to scale)

Doc# 100850 • REV B (April 2018) Page 4 of 8
Peak Detect Measurement
To inialize the Peak Detect measurement mode, set input switch 2 to Threshold, Pulse-
Time, Peak Detect and input switch 3 to PD as shown in Figure 2. If the Impact Meter is
already turned on, it will automacally detect the new switch seng and proceed with the
Peak Detect measurement. If the Impact Meter is turned o, momentarily toggle switch 1
to the ON/OFF posion. This will inialize the Impact Meter to start making Peak Detect
measurements.
During inializaon of the peak detect measurement; the Impact Meter will display “Inial-
izing Peak Detect” as shown in gure 4. The Impact Meter measures the pulse me period
seng of the Impact Transmier and uses this to determine the internal ming of the
measurement.
The Peak Detect mode enables the Impact Meter to measure the Peak
impact voltage levels generated by the Impact Transmier. Refer to
Figure 5 for an example of a typical measurement.
The peak detect measurement displays the peak voltage, Figure 6,
amplitude (Impact Level) that is present during one pulse me period.
The displayed value will increase if the last value measured is higher
than the previous value measured. The displayed value will decrease
if the new peak value is less than ½ of the previous peak value. For
Figure 5
NOTE: Since the peak detect measurement is reliant on
a stable pulse me seng of the Impact Transmier, it
is important not to adjust the pulse me on the Impact
Transmier while taking a peak detect measurement.
Figure 4

Doc# 100850 • REV B (April 2018) Page 5 of 8
Figure 6
example, the displayed peak detect measurement for t1 as shown in Figure 8 is 320mV. This
is the maximum impact level detected during the pulse me t1. During t2, the maximum
impact level detected is 400mV. Since this value is greater than 320mV, the impact meter
will display the new value of 400mV. During t3, the maximum impact level detected is again
320mV. However, the impact meter will connue to display 400mV since the previous value
is slightly larger but not smaller by half. During t4, the maximum impact level detected is
180mV. Since this value is smaller than ½ of 400mV or smaller than 200mV, the Impact
Meter will now display 180mV.
The main advantage of the peak detect measurement is that it provides a stable maximum
peak “impact level” that may be used to set the Threshold level. As a rule of thumb, it is rec-
ommended that the threshold level be set 2 to 3 mes the peak level during normal operaon.
4-20mA Measurement
To inialize the 4-20mA measurement mode, set input switch 2 to 4-20mA as shown below
in Figure 2. If the Impact Meter is already turned on, it will automacally detect the new
switch seng and proceed with the 4-20mA measurement. If the Impact Meter is turned
o, momentarily toggle switch 1 to the ON/OFF posion. This will inialize the Impact Meter
to start making a 4-20mA measurement.
The 4-20mA measurement will congure the impact transmier in normal mode. This
mode will allow the Impact Meter to measure the 4 to 20mA loop current generated by the
Impact Transmier. Refer to Figure 8 for an example of a typical 4-20mA measurement.
Refer to secon 6 of this user manual for more informaon on the 4 to 20mA impact sever-
ity measurement.
Example of current output vs. number of impacts per me period.
Impacts mA
0 4
1 5
2 6
37
4 8
5 9
6 10
711
8 12
9 13
10 14
11 15
12 16
13 17
14 18
15 19
16 20

Doc# 100850 • REV B (April 2018) Page 6 of 8
Dynamic Signal
A BNC Connector is provided on the Impact Meter for viewing the impact waveform through
the use of a scope or other measurement device.
Baery Replacement
The Impact Meter is designed to oer approximately 8 hours of connuous operaon under
normal condions. The Impact Meter checks for low baeries during power up. During this
me, the Impact Meter will display “Low Baery Voltage Detected, Replace Baeries” as
shown below in Figure 7 if the baery power is too low. Aer receiving this message, the
baeries should be replaced to avoid any potenal measurement errors.
To replace the baeries on the Impact Meter, remove the 6 screws on the back of the case
as shown in Figure 8. This will allow access to the baery compartment.
Figure 7
Figure 8
Shut Down
To preserve baery life, the Impact Meter will
shut down power on its own. This me may
vary between 5- and 15-minutes depending
on which mode it is operang in.
Alternavely, the power to the device may
be turned o by holding down switch 1 in
the ON/OFF posion for 5 seconds and then
releasing it.
The Impact Meter will also automacally
detect when an Impact Transmier is not
connected and will shut down on its own to
preserve baery life.

Doc# 100850 • REV B (April 2018) Page 7 of 8

Doc# 100850 • REV B (April 2018) Page 8 of 8
This electronic equipment was manufactured according to high quality stan-
dards to ensure safe and reliable operaon when used as intended. Due to its
nature, this equipment may contain small quanes of substances known to be
hazardous to the environment or to human health if released into the environ-
ment. For this reason, Waste Electrical and Electronic Equipment (commonly
known as WEEE) should never be disposed of in the public waste stream. The
“Crossed-Out Waste Bin” label axed to this product is a reminder to dispose
of this product in accordance with local WEEE regulaons. If you have ques-
ons about the disposal process, please contact Metrix Customer Services.
ENVIRONMENTAL INFORMATION
info@metrixvibraon.com
www.metrixvibraon.com
8824 Fallbrook Dr. Houston, TX 77064, USA
Tel: [phone] • Fax: [phone]
Aer Hours (CST) Technical Assistance: 1.713.452.9703