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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, 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, Acceleration: 50 m/s2
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. 200 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: NEMA4X 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)

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 to 5 kHz

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.