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Frequency/Rate Meter


Highly Visible LCD Display with 2-color (Red and Green) LEDs


Model K3MA-F 100-240VDC,
K3MA-F-A2 100-240VAC
Supply voltage 100 to 240 VAC 24 VAC/VDC
Operating voltage range 85% to 110% of the rated supply voltage
Power consumption
(under maximum load)
6 VA max. 4.5 VA max. (24 VAC)
4.5 W max. (24 VDC)
External power supply 12 VDC (±10%), 0 to 40 mA
Insulation resistance 20 MΩ min. (at 500 VDC) between external terminal and case.
Insulation provided between inputs, outputs, and power supply.
Dielectric strength 2,000 VAC for 1 min between external terminal and case.
Insulation provided between inputs, outputs, and power supply.
Noise immunity ±1,500 V on power supply terminals in
normal or common mode.
±1 μs, or 100 ns for square-wave noise
with 1 ns.
±480 V on power supply terminals in normal
±1,500 V in common mode.
±1 μs, or 100 ns for square-wave noise with
1 ns.
Vibration resistance Vibration: 10 to 55 Hz, 0.35-mm half amplitude
5 min each in X, Y, and Z directions for 10 sweeps.
Shock resistance 150 m/s2 (100 m/s2 for relay contact outputs) 3 times each on 3 axes, 6 directions.
Ambient temperature Operating: -10°C to 55°C (with no condensation or icing)
Storage: -25°C to 65°C (with no condensation or icing)
Approved safety
UL61010-1, CSA C22.2 No.61010-1-04, conforms to EN61010-1 (Pollution degree 2/
overvoltage category II)
Conforms to VDE0106/P100 (finger protection)
EMC (EMI) EN61326-1 Industrial electromagnetic environment
Emission Enclosure: CISPR 11 Group 1 class A: CISRP16-1/-2
Emission AC Mains: CISPR 11 Group 1 class A: CISRP16-1/-2
(EMS) EN61326-1 Industrial electromagnetic environment
Immunity ESD: EN61000-4-2: 4 kV contact discharge, 8 kV air discharge
Immunity RF-interference: EN61000-4-3: 10 V/m (amplitude-modulated, 80 MHz to 1 GHz)
Electrical Fast Transient Noise: EN61000-4-4: 2 kV (power line)
Immunity Burst Noise: 1 kV line to line (I/O signal line)
Immunity Surge: EN61000-4-5: 1 kV (power line), 2 kV line to ground (power line)
Immunity Conducted Disturbance: EN61000-4-6: 3 V (0.15 to 80 MHz)
Immunity Voltage Dip/Interrupting: EN61000-4-11: 0.5 cycle, 0, 180°, 100% (rated voltage)
Weight Approx. 220 g


Input signal No-voltage contact (30 Hz max., ON/OFF pulse width: 15 ms min.)
Voltage pulse (5 kHz max., ON/OFF pulse width: 90 μs min., ON voltage: 4.5 to 30 V/
OFF voltage: 0 to 2 V)
Open collector (5 kHz max., ON/OFF pulse width 90 μs min.)
Connectable Sensors
ON residual voltage: 2.5 V max.
OFF leakage current: 0.1 mA max.
Load current:
Must have switching capacity of 15 mA min.
Must be able to dependably switch a load current of 5 mA max.
Measuring accuracy ±0.1%FS ±1 digit (at 23±5°C)
Measurement method Cycle measurement
Max. displayed digits 5 digits (-19999 to 99999)
Display 7-segment digital display, Character height: 14.2 mm
Polarity display “-” is displayed automatically with a negative input signal.
Zero display Leading zeros are not displayed.
Scaling function Programmable with front-panel key inputs (range of display: -19999 to 99999).
The decimal point position can be set as desired.
Hold function Max hold (maximum value), Min hold (minimum value)
Hysteresis setting Programmable with front-panel key inputs (0001 to 9999).
Other functions Scaling teach function
Display color change (green (red), green, red (green), red)
OUT type change (upper limit, lower limit, upper/lower limit)
Average processing (simple average OFF/2/4/8 operations)
Auto-zero time
Startup compensation time
Setting change lockout
Parameter initialization
Display auto-return time
Output Relays: 2 SPST-NO
Delay in comparative outputs 750 ms max.
Degree of protection Front panel: NEMA TYPE 4X for indoor use (equivalent to IP66)
Rear case: IEC standard IP20
Terminals: IEC standard IP00 + finger protection (VDE0106/100)
Memory protection Non-volatile memory (EEPROM) (possible to rewrite 100,000 times) (with terminal
cover attached)

Measuring Ranges

No-voltage Contact/Open Collector Inputs

Input Measuring range Measuring accuracy Displayable range
No-voltage contact (30 Hz max.) with
ON/OFF pulse width of 15 ms min.
0.05 to 30.00 Hz ±0.1% FS ±1 digit max.
(at 23±5°C)
-19999 to 99999
(with scaling function)
Open collector (5 kHz max.) with
ON/OFF pulse width of 90 μs min.
0.05 to 5000 Hz

Input/Output Ratings

Relay Contact Output

Item Resistive load
(cosφ = 1)
Inductive load
(cosφ = 0.4, L/R = 7 ms)
Rated load (UL ratings) 5 A at 250 VAC, 5 A at 30 VDC 1 A at 250 VAC, 1 A at 30 VDC
Min. permissible load
(P level, reference value)
10 mA at 5 VDC
Mechanical life 5,000,000 times min.
Electrical life 100,000 times min.