Logitech 2000 MKIII Series User manual

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2000 MKIII SERIES
Tachometers
Model 2000T/DC
User Guide

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Specification
Display 7 decade (or 6 decade and sign), 7-segment high brightness
red LED, 10mm high
Decimal point Programmable via display
Scaling Programmable via display, retained in non-volatile memory
Signal inputs Protected to 100Vdc
Standard sensitivity mode From 90mV @ 10Hz, 170mV @ 10kHz
High sensitivity mode From 12mV @ 10Hz, 20mV @ 10kHz
Frequency 50kHz maximum with single input (200Hz in Reed Mode)
30kHz maximum with dual inputs (200Hz in Reed Mode)
Impedance 15kΩ minimum
Accuracy <0.01% with square wave at 1V peak
Alarms 60Vdc maximum, sink of 150mA maximum
Digital Output Pulse to supply, internal 4.7kΩ pull-up to supply or sink of
(“D” option only) 150mA maximum
Analogue Voltage & Current User selectable as 0 - 5V, or 1 - 5V, or 0 - 10V, or 2 - 10V
(“A” option only) 0 - 20mA, or 4 - 20mA
Connections Screw terminals on rear panel
Power requirement
DC 12 to 30Vdc via power connector or Vs and 0V terminals
Temperature range Operating -20°C to +70°C
Storage -20°C to +85°C
Dimensions 96 x 48 x 72mm (panel cut-out 92 x 43mm)
Weight 150g

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General description
The 2000T MKIII SERIES Tachometers are 7-decade unsigned, or 6-decade signed, seven segment,
high brightness red LED display instruments. They are built into half DIN (96 mm x 48 mm)
panel mounting housings and operate on 12V-30Vdc power supplies, or from 110Vac/230Vac
supply using the supplied power adapter.
Two signal inputs are available, Input A (IPa) and Input B (IPb). Each input can be
independently set to operate in one of three modes: standard sensitivity, high sensitivity or
reed switch. Each input also has an independent sensitivity setting, which the user can adjust
electronically via the front panel.
The tachometer measures the input frequency on one or both inputs (depending on the mode
selected), then scales this value according to the user set scaling factor. The result of this
calculation is then displayed. By appropriate configuration of the scaling factor the unit can
be configured to display speed for instance in m/s, mph, or RPM, or the frequency can be
related to another measurement such as flow rate (e.g. litres/min) in the case of flow
metering applications.
The display can operate in one of four modes: Frequency A, Frequency B, Ratio A/B, Ratio B/A.
Each mode has independent settings and the active mode can be switched by the user during
operation.
The 2000T MKIII has 2 configurable alarm outputs, which can be set to operate as either high
or low alarms at the set scaled frequency thresholds.
2000T MKIII SERIES are available with factory fitted options, which must be specified when
ordering. Additionally, Logitech will customise the programmed operating modes of these
tachometers to suit specialised applications. Please contact our sales office to discuss this.
2000T MKIII SERIES Variants
2000T - Standard 2000T MKIII Series Tachometer
2000TX - 2000T MKIII Series Tachometer with optional extra features, where X can be one or
more of the following:
A - Analogue Voltage/Current Output
D - Digital Output (pulse to Vs)
L - Latching alarm outputs
IF - RS232 output
USB - USB connectivity (see “2000USB Software User Guide”)

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Front Panel
The panel has three touch switches: settings, select and increment/reset.
Rear panel terminals
The image above shows the rear panel of a standard 2000T MKIII instrument. The actual
terminals available on the rear panel will vary depending on the model. Below are the
definitions of each of the terminals that may be present. Refer to the terminal labels on the
instrument and match these with the functions below.
Settings
Increment/reset
Select

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Vs = Supply voltage, passed through from power connector, or apply 12-30Vdc to power
unit).
0V = 0V/ground passed through from power connector or connect to 0V if powering unit
from rear terminals.
RST = Reset input. Used to reset the latching alarms on “L” models and to release the
settings lock on all 2000T models. Connect to 0V to activate the reset.
M = Mode change input. Used to toggle between active modes (all modes with a scaling
factor not equal to zero). Connect to 0V momentarily to change to the next
configured mode.
AL1 = Alarm Output 1. The alarm direction and threshold are user set.
AL2 = Alarm Output 2. The alarm direction and threshold are user set.
IPa = Signal Input A. Input type (standard, high sensitivity or reed switch) & sensitivity user
set, independently of channel B.
IPb = Signal Input B. Input type (standard, high sensitivity or reed switch) & sensitivity user
set, independently of channel A.
Ao = Analogue output. The type and range of the analogue output is determined by the
user selected option (setting A OUT).
Do = Digital output. As standard this will provide a pulse to Vs at a scaled frequency,
determined by the user set division factor (setting D OUT).
NC = No connection.

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Programming the instrument
Calculated Result
The result will be calculated according to the options and values selected for the mode,
calculation, scaling factor and offset, which are described in detail below. The equation for
this will be as follows:
CALC: Frequency A mode: Frequency B mode:
MUL
𝐷" = " (𝑅!"×"𝑆!)" + " 𝑂!
𝐷" = " (𝑅""×"𝑆") " +"𝑂"
DIV
𝐷" = " #!
$!
"+ " 𝑂!
𝐷" = " #"
$"
"+ " 𝑂"
A/B mode: B/A mode:
MUL
𝐷 = #!%×%$!/"
#"
+ 𝑂!/"
𝐷 = #"%×%$"/!
#"
+ 𝑂"/!
DIV
𝐷 = " #!
#"%×%$!/"
+ 𝑂!/"
𝐷 = " #"
#!%×%$"/!
+ 𝑂"/!
Where:
𝐷
is the displayed value.
𝑆
is the scaling factor for the mode.
𝑅
is the rate (frequency) of the input signal on IPa and/or IPb.
𝑂
is the offset for the mode.
The value
𝐷
calculated according to the equations above will be shown on the display with
each update. Where this manual refers to the scaled frequency value, it is this result that is
considered (e.g. alarm outputs, analogue output).
Choice of CALC setting
In most cases the 2000T has sufficient digits to accurately represent the scaling factor whether
it is multiplicative or reciprocal, and the calculation can be chosen based on preference.
However, in the case of very small numbers (where most of the entered digits would be zero),
greater accuracy can be obtained by inverting the scaling factor and changing the calculation
type. Flowmeter K-factors are an example of when this can be a useful approach. With the

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unit in division mode, the K-factor can be entered as the scaling factor directly, and the display
would give a readout in litres per second.
Calculating a scaling factor
The scaling factor is often most easily calculated by considering the maximum input frequency
expected and by deciding what the display should read at this frequency. The scaling factor
can then be determined from the appropriate calculated result equation.
A few common examples are given below for reference:
𝐷
is the displayed value in the desired units
𝑅!
is the measured frequency in pulses per second (Hz)
𝑆!
is the required scaling factor
Gear in RPM:
"𝐷" = "
(
𝑅!" ×"𝑆!
)
"
𝑆!"="()
*
where
𝑁
is the number of teeth on the target gear.
Flowmeter in litres per minute (lpm):
𝐷" = " #!
$!
𝑆!=+
()
where
𝐾
is the flowmeter K-factor in pulses per litre.
Vehicle speed e.g. km per hour, miles per hour:
𝐷" = "
(
𝑅!" ×"𝑆!
)
𝑆!= " ()×()×∆-
*
where
∆𝑠
is the distance travelled per rotation of the target gear.
𝑁
is the number of teeth on the target gear.
The scaling factor range is 0.000001 to 9999999 (unsigned) or -999999 to 999999 (signed) and
it may be necessary to round off the calculated value to fit within this range. When setting
the scaling factor it is important to ensure that with the decimal point position selected, there
are enough digits to display the maximum value for the application. Otherwise, the number
of decimal places will need to be reduced or the display units altered, with the scaling factor
adjusted accordingly.

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Setting an Offset
The 2000T tachometer has an OFFSET facility that can be either positive or negative. It is a
very useful addition to the scaling factor and can be used to display percentage difference
between A and B, or show the deviation from a nominal value.
For example: If the nominal frequency on Input A is 1000 Hz, by setting the scaling factor to 1
and the OFFSET to -1000, the display will show the deviation from 1000 Hz.
Another use of the OFFSET is in the display of percentage difference between signal A and
signal B. One of the signals is chosen as the reference (say signal A).
The percentage difference is given by:
".!
!×100
which simplifies to:
(""
!"× "100")"– "100"
Thus, by setting the mode to read ratio B/A with a scaling factor of 100 and an offset of –100,
the percentage difference between A and B will be displayed.
Please note that the function of the 7th decade (7 DISP) must be set to sign in order to set
negative offset values.
Decimal Places
The decimal point position can be user set for each mode and adjusted to either increase or
reduce the number of decimal places displayed. The result will automatically be rounded to
the set number of decimal places. Alarms and other outputs will however always use the
calculated result and not the rounded display value.
The number of decimal places is altered in the settings menu (DISP DP). When doing so, it is
important to ensure that the maximum possible display value can be displayed in the
remaining digits. The display will read HIGH when the result is larger than can be displayed
with the current settings.
Update Time
The update time determines the rate at which the frequency calculation is performed and
that the display (and analogue output on “A” models) are updated. The user can select
between a number of options for this: 100ms, 250ms, 500ms, 1000ms (1s), 3000ms (3s).
Wait Time
Provided that a pulse has been detected within the configured update time, the display will
update at this configured interval as described above. The wait time determines the

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additional time (in seconds) for which the unit will wait to receive a pulse, before setting the
calculated frequency to zero. This setting is independent of the update time. The wait time
can be user set anywhere between 1s and 20s. If the wait time is set to 0, the unit will not
wait beyond the configured update time.
Alarm Outputs
The 2000T MK3 has two configurable alarm outputs. Both outputs are NPN (switch to 0V on
activation), with a maximum voltage of 60Vdc and sink current of 150mA.
When configured as a high alarm (HI), the alarm will be activated when the scaled frequency
(for the active mode) is greater than, or equal to, the programmed value.
When configured as a low alarm (LO), the alarm is activated when the scaled frequency (for
the active mode) is less than, or equal to, the programmed value.
The alarm outputs automatically reset when the value shown on the scaled frequency no
longer meets the selected criteria.
If specified at time of ordering (type “L”), a 2000T can be supplied with a latching facility for
the alarm outputs. Resetting the outputs is then performed by grounding the reset terminal
(RST) on the rear panel or reset via the front panel.
Mode Selection
The 2000T tachometer will operate in any one of four modes, each of which has
independent settings. The four modes are:
1. Frequency A (FREQ A)
2. Frequency B (FREQ B)
3. Ratio Frequency A / Frequency B (A/B)
4. Ratio Frequency B / Frequency A (B/A)
It is possible to configure any or all of these modes. If more than one mode has been
configured, the user can switch between these modes at any time. In order to do so, either
momentarily connect the mode terminal “M” to 0V, or switch the mode via the front panel
as described below. It is recommended to install a momentary push switch for this purpose,
if mode changes will be required. In order for a mode to be selectable, its scaling factor must
be set to a non-zero value in the settings menu. The mode switch will then change between
all configured modes in the above order.

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The active mode can also be changed from the front panel. In run mode, press the select
button. The current mode will be displayed for a period of 2s. Pressing select again while the
mode is displayed, will switch to the next active mode. If no other modes are configured, the
current mode will continue to be displayed.
Output Options
Analogue Output
“A” models are configured with an analogue output terminal, labelled “Ao” on the rear
terminals. The analogue output can be set to be either voltage or current. The output modes
are selectable as:
Voltage: 0 - 5V, 1 - 5V, 0 - 10V or 2 - 10V
Current: 0 - 20mA or 4 - 20mA
In addition to selecting the type and range of the output, the reference and full-scale values
must also be set. Scaled frequency values at or below the reference will be set to the lowest
output value in the selected range. Scaled frequency values at or above the full-scale value
will be set to the maximum value in the selected range. In between the reference and full-
scale values, the analogue output will be set linearly according to the reference, full-scale and
scaled frequency value.
Digital Output
“D” models are configured with a digital output terminal. This digital frequency divider
provides a scaled frequency square wave output. The scaling factor can be set anywhere
between 0 (output off) and 1 (output equal to input frequency). For example, if set to 0.5 the
frequency of the digital output will be equal to half of the frequency of the input signal. In
Frequency A and Frequency B mode the digital output provides a divided version of the
respective channel. In A/B mode the frequency on Input A determines that of the digital
output and in B/A this is determined by Input B.
The digital output provides a pulse to supply (Vs) with a 4.7kΩ pull-up resistor and can sink
up to 150mA.

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Changing Settings
On first power up from factory settings, the unit will enter set mode. Set Mode can also be
accessed after initial configuration by holding the settings button ! and then with this held,
pressing the increment touch button ↑.
In set mode press the settings button to move on to the next setting, select ← to move
between digits or increment ↑ to modify the value.
Hold the settings touch button ! and then with this held press increment ↑ at any time to
update the settings and return to Run Mode.
Text highlighted in red below shows what will appear on the display. Settings will typically be
displayed in the order below, though the available settings will vary depending on the
selected instrument.
A setting can be skipped by pressing settings ! when either the title or the setting value is
displayed. Once all settings have been stepped through or skipped, the unit will return to
setting 1. The unit will remain in set mode until run mode is entered as described above.
Each mode has an independent set of settings and after the mode is selected, the set values
will be applied to that mode only. The exceptions to this are the input type (INPUT) which is
available in Frequency A and Frequency B mode only and set the input type for that channel,
and the lock (LOCKED) which locks the settings for all modes when set to YES.
The settings will be displayed and can be altered as follows:
1. MODE – Set frequency mode [Default A]
Press increment ↑ to select from the below options.
FREQ A = Frequency A
FREQ B = Frequency B
A/B = Ratio A/B
B/A = Ratio B/A
Press settings ! or select ← to move to the next setting.
2. 7 DISP – Set function of 7th display [Default DIGIT]
Press increment ↑ to change between from the below options.
DIGIT = Display is 7 digits (unsigned)
SIGN = Display is 6 digits & sign
Press settings ! or select ← to move to the next setting.

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3. INPUT – Set input mode [Default STD]
Available in FREQ A or FREQ B mode and sets the input type for that channel only.
The selected input type will also be applied to that channel in ratio mode.
Press increment ↑ to change between from the below options.
STD = Standard sensitivity (from 100mV)
HI SENS = High sensitivity (from 10mV)
REED = Reed switch (max. input frequency 200Hz)
Press settings ! or select ← to move to the next setting.
4. CALC – Set calculation mode [Default MUL]
Press increment ↑ to change between the below options.
DIV = Divide by scaling factor
MUL = Multiply by scaling factor
Press settings ! or select ← to move to the next setting.
5. SCALE - Set scaling factor. [Default 0]
Enter the scaling factor to be applied to the measured frequency value. Depending on
the calculation mode selected the measured frequency will either be multiplied or
divided by this value.
Press select ← to select digit and increment ↑ to change value. In unsigned mode,
after cycling through all seven digits the decimal point position can be altered by
pressing increment ↑. In signed mode, after cycling through all six digits, all digits will
flash and the sign can be toggled by pressing increment ↑. Press select ← once the
sign is set to then set the decimal point position.
For the mode to be viewable via the mode select button, the scaling factor must have
a non-zero value.
Set all digits to 0 on all four frequency modes to restore default settings (the position
of the decimal point does not matter when performing a restore to default).
Press settings ! at any time to move to the next setting.
6. DISP DP – Set display decimal point position [Default 1DP]
Select the number of decimal points to display the scaled frequency value to. The
decimal point position can be altered by pressing increment ↑. This limits the range
of values that can be displayed. The unit will display “high” when the calculated value
is greater than can be displayed on the number of digits available. Remaining settings
(other than scaling factors) will also be limited to this number of decimal places.
Press settings ! or select ← to move to the next setting.
NOTE: This setting is now independent of the scaling factor value, e.g. a setting of 1
decimal place does not require the scaling factor to be multiplied by 10.

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7. OFFSET – Set the offset to be added to the scaled frequency [Default 0]
Refer to page X for details on the offset.
Press select ← to select digit and increment ↑ to change value.
In signed mode, after cycling through all six digits, all digits will flash and the sign can
be toggled by pressing increment ↑.
The number of decimal places is limited by the DISP DP setting.
Press settings ! at any time to move to the next setting.
8. ALARM 1 – Set alarm output 1 direction and threshold value
Press increment ↑ to select from the below options.
HI = High alarm (output switched to 0V when scaled frequency value ≥ value)
LO = Low alarm (output switched to 0V when scaled frequency value ≤ value)
Press select ← or settings ! once the alarm type is selected, to then set the alarm
value.
Enter the scaled frequency value below which the low alarm will be activated.
Press select ← to select digit and increment ↑ to change value. The decimal point
position is locked to the display value set under DISP DP.
In signed mode, after cycling through all six digits, all digits will flash and the sign can
be toggled by pressing increment ↑.
Press settings ! at any time to move to the next setting.
9. ALARM 2 – Set alarm output 2 direction and threshold value
This is configured by following the same process as for ALARM 1.
10. A OUT – Set the analogue output mode [Default OFF]
Press increment ↑ to select from the below options. One of these output modes
must be selected in order for the rate controller to function.
OFF = Analogue output off
V 0TO5 = 0V to 5V
V 1TO5 = 1V to 5V
V 0TO10 = 0V to 10V
V 2TO10 = 2V to 10V
I 0TO20 = 0mA to 20mA
I 4TO20 = 4mA to 20mA
If one of the voltage output modes is selected the analogue voltage output will be on
terminal “Ao”.
If one of the current output modes is selected, the analogue current output will be
on terminal “Ao”.
Press settings ! or select ← to move to the next setting.

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11. A REF – Set the reference (minimum) scaled frequency value for the analogue output.
[Default 0]
Enter the displayed (scaled) value, below which the analogue output will be at the
minimum for the selected voltage/current range.
Press select ← to select digit and increment ↑ to change value.
In signed mode, after cycling through all six digits, all digits will flash and the sign can
be toggled by pressing increment ↑.
The number of decimal places is limited by the DISP DP setting.
Press settings ! at any time to move to the next setting.
12. A FULL – Set the full scale (maximum) value for the analogue output. [Default 0]
Enter the displayed (scaled) value, above which the analogue output will be at the
maximum for the selected voltage/current range.
Press select ← to select digit and increment ↑ to change value.
In signed mode, after cycling through all six digits, all digits will flash and the sign can
be toggled by pressing increment ↑.
The number of decimal places is limited by the DISP DP setting.
Press settings ! at any time to move to the next setting.
13. D OUT – Set the digital frequency divider factor. [Default 0]
This can be set anywhere between 0 (digital output off) and 1 (digital output
frequency equal to the input frequency). Values greater than 1 will be set to 1
automatically.
Press select ← to select digit and increment ↑ to change value.
After cycling through all digits the decimal point position can be altered by pressing
increment ↑.
Press settings ! at any time to move to the next setting.
14. WAIT – Set the wait time in seconds [Default 1]
Set the wait time in seconds that the unit will wait to receive a pulse on the active
input(s) before displaying zero (or the offset value if this has been set).
This setting can be anywhere between 0 and 20.
Press increment ↑ to change value.
Press settings ! or select ← to move to the next setting.

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15. UPDATE – Set the display & analogue output update time [Default 1000MS]
Press increment ↑ to select from the below options. One of these output modes
must be selected in order for the rate controller to function.
100 MS = 100ms (0.1s)
250 MS = 250ms (0.25s)
500 MS = 500ms (0.5s)
1000 MS = 1000ms (1s)
3000 MS = 3000ms (3s)
Press settings ! or select ← to move to the next setting.
16. LOCKED – Lock settings [Default NO]
Once locked is set to yes, upon entering run mode the values of all settings are
maintained but cannot be altered without first performing an unlock.
Press increment ↑ to change between from the below options.
NO = Not locked, all settings are accessible in the set menu.
YES = Locked, the set menu and sensitivity adjustment can no longer be accessed
without unlocking via the reset terminal.
Press settings ! or select ← to return to the mode setting.
Setting the Sensitivity [Default 50]
The sensitivity can only be altered in Frequency A mode or Frequency B mode, and this will
set the sensitivity value for the respective input only. Press and hold the settings button !,
then press the select ← button to enter sensitivity mode The display will show SENS and then
the current value is displayed. Sensitivity ranges from 0 (least sensitive) to 63 (most sensitive).
If the lock has been activated in the settings menu, the display will instead show “LOCKED”,
and the unit must first be unlocked following the “Unlock the Settings” procedure below to
adjust the sensitivity
Press select ← to reduce the value or increment ↑ to increase it. After 2s of neither button
being touched the unit will apply the selected sensitivity value and return to run mode. It is
recommended that the sensitivity level is set only as high as necessary to obtain a steady
signal. This minimises the risk of detecting spurious signals.

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Viewing the Settings
The current values of all settings can be viewed at any time in run mode. To do so, press and
release the settings button !. The display will show DISPSET and will then display the title
and current value of each setting in order. To skip over a setting, press the settings button !.
The display will automatically return to run mode once all settings have been displayed. Press
and hold settings ! then press increment ↑ to immediately return to run mode at any time.
Unlocking the Settings
Once the settings have been locked, the set menu and sensitivity adjustment can no longer
be accessed. To remove the lock and enable access to all unit settings, an unlock must be
performed. To do so, connect the reset input to ground and then power on the unit. The set
menu and sensitivity adjustment can be accessed while the reset input is grounded. Upon
entering set mode, the lock will be released (LOCKED set to NO). Select YES from the LOCKED
setting to re-activate the settings lock.
Setting the Sensitivity
The sensitivity can only be altered in Frequency A mode or Frequency B mode, and this will
set the sensitivity value for the respective input only. Press and hold the settings button !,
then press the select ← button to enter sensitivity mode The display will show SENS and then
the current value is displayed. Sensitivity ranges from 0 (least sensitive) to 63 (most sensitive).
If the lock has been activated in the settings menu, the display will instead show “LOCKED”,
and the unit must first be unlocked following the “Unlock the Settings” procedure below to
adjust the sensitivity
Press select ← to reduce the value or increment ↑ to increase it. After 2s of neither button
being touched the unit will apply the selected sensitivity value and return to run mode. It is
recommended that the sensitivity level is set only as high as necessary to obtain a steady
signal. This minimises the risk of detecting spurious signals.

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Variable Reluctance Magnetic Pickups
Set input type (INPUT) to standard sensitivity (STD) or high sensitivity (HS) depending on
target diameter and rotational speed. Connect the cable screen and one of the two wires from
the magnetic pickup to the common 0V terminals (shown as the black wire below). Connect
the other wire from the magnetic pickup to the input. Adjust sensitivity to ensure that the
correct value displayed at the minimum rotational speed. Either IPa or IPb can be used for
single channel operation.
Single Channel Operation
Dual Channel (Ratio) Operation
Vs IPb0VIPa0VNCNCNCNCNC0V
Gear Wheel or Flowmeter
Magnetic Pickup
Screen
Vs IPb0VIPa0VNCNCNCNCNC0V
Gear Wheel or Flowmeter
Magnetic Pickups
Screen

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Electronic Sensors and Rotary Encoders
Set input type (INPUT) to standard sensitivity (STD). The sensor/encoder can be supplied from
the Vs terminal, provided that the sensor is rated to operate at this voltage. The
sensor/encoder’s 0V connection should be made to any of the common 0V terminals, along
with the cable screen if this is not connected to 0V at the sensor/encoder end. The signal can
be connected to either IPa or IPb for single channel operation.
Reed Switch
Set input type (INPUT) to reed switch (REED). Connect one switch terminal to the supply
voltage (Vs) and the other to the input terminal IPa or IPb for single channel operation. The
maximum frequency is limited to 200Hz. Adjust the sensitivity until the correct value is
displayed at the maximum frequency of operation.
Vs IPb0VIPa0VNCNCNCNCNC0V
V+ Screen
0V
Signal
Vs IPb0VIPa0VNCNCNCNCNC0V

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Alarm Connections
Example alarm configurations are shown below.
NOTE: Switching Relays.
If the relay module does not have integrated back EMF suppression, it is essential that a diode
is connected across the coil as shown in the diagrams.

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Electro-Magnetic Precautions
A great deal of noise immunity has been designed into the product in accordance with the
EMC directive 2014/30/EU, the Electromagnetic Compatibility Regulations 2016, BS EN IEC
61000-6-2 and BS EN IEC 61000-6-4.
However, it is still vital to use good EMC (Electro-Magnetic Compatibility) techniques on
installation of both this and other associated electronic equipment and sensors in order to
ensure reliable operation.
It is important to note that if used with systems that radiate high levels of harmonic noise
such as DC Drives, AC Inverters and Servo Drives then the levels of imposed interference can
greatly exceed that of the European Standards.
In such cases it is important to ensure that mains leads are routed as far as possible from all
cables carrying power to such equipment and that the supply should, if viable, be taken from
a clean source. Where this is not possible, it is advisable to use a good quality mains filter
mounted as close to the instrument as possible, ensuring that the cable between the filter
and the instrument is kept separate from any cables carrying high levels of current or any fast-
switching transients.
All signal connections to the instrument should be made using a screened lead with the screen
connected to ground/0V at one end only.
Warranty
2000T MKIII SERIES Tachometers carry a two-year warranty that is only valid where there is no
damage caused by accident, negligence, misapplication, or repairs/modifications attempted
by unauthorised personnel. The warranty only extends to the original user.
Copyright © Logitech Electronics Limited 2022
Document No: 2000T-MKIII_hb v1.1 May 2022