The YOKOTA Digital Torque Testers, models YET-501C, YET-1001C, YET-2001C, YET-5001C, and YET-10001C, are precision instruments designed for measuring the torque generated by various tools, particularly those used for screw tightening. These testers are developed to achieve high accuracy in torque control, offering a measurement range from 0.1 to 9.9 seconds.
Function Description
The core function of these testers is to accurately measure and display torque values. They are suitable for a variety of applications, including the measurement of torque from impulse wrenches, angle nut runners, impact wrenches, and other torque-generating tools. The device operates in two primary modes: P-P mode and OFF mode.
In P-P mode, the tester holds the peak value of the input signal and displays it. Upon timer completion, indicated by the time-out display lamp, the displayed value is held for a set duration (typically 1 to 3 seconds) before automatically resetting to 0 kgf·cm. This mode is ideal for measuring the transient torque generated by impulse wrenches, angle nut runners, and impact wrenches, where the peak torque is of interest. The measurement time in P-P mode can be set from 0.1 to 9.9 seconds in 0.1-second increments using the digital switch, allowing for the measurement of starting torque or the rising capability of a tool.
In OFF mode, the tester continuously displays real-time input signals. This mode is primarily used for zero adjustment and gain adjustment, providing a live view of the torque data as it is applied.
The device also features a pulse counter, which can accurately display torque from 10% or more of the maximum torque. However, it is explicitly stated that the pulse counter should not be used for impact-type tools like impact wrenches, as their hitting torque is not stable, leading to inaccurate readings.
Important Technical Specifications
Models and Measuring Ranges:
- YET-501C: 5 to 50 N·m
- YET-1001C: 20 to 100 N·m
- YET-2001C: 50 to 200 N·m
- YET-5001C: 100 to 500 N·m
- YET-10001C: 200 to 1000 N·m
Scale Unit (Resolution):
- YET-501C: 0.02 N·m
- YET-1001C, YET-2001C: 0.1 N·m
- YET-5001C: 0.2 N·m
- YET-10001C: 1 N·m
Static Load Precision (Accuracy):
- YET-501C: 5 to 50 ± 0.25 N·m
- YET-1001C: 10 to 100 ± 0.5 N·m
- YET-2001C: 20 to 200 ± 1 N·m
- YET-5001C: 50 to 500 ± 2.5 N·m
- YET-10001C: 100 to 1000 ± 5 N·m
Power Requirements:
- AC100V to 240V ± 10%, 50/60 Hz, 15W
Weight:
- Amplifier: 3.0 kg (6.6 lb)
- Pick-up (YET-501C): 9.9 kg (21.8 lb)
- Pick-up (YET-1001C): 10.1 kg (22.0 lb)
- Pick-up (YET-2001C): 10.0 kg (22.0 lb)
- Pick-up (YET-5001C, YET-10001C): 22.7 kg (50.0 lb)
Standard Accessories:
- One set of cable for pickup.
- YET-501C: 1pce. square bit.
- YET-1001C: 1pce. 3/8"sq x 1/2"sq adapter, 1pce. square bit.
- YET-2001C: 1pce. 3/8"sq x 1/2"sq adapter.
- YET-5001C: 1pce. 1/2"sq x 3/4"sq adapter.
- YET-10001C: No adapter.
Output Terminals:
- Parallel output for printer (Centronics conform).
- Analog output (terminal for waveform measuring).
- Serial output (RS-232C).
Pick-up Insertion Slot Square Sizes:
- YET-501C: 9.52mm (3/8sq)
- YET-1001C, YET-2001C: 12.7mm (1/2sq)
- YET-5001C: 19.0mm (3/4sq)
- YET-10001C: 25.4mm (1sq)
Usage Features
The YOKOTA Digital Torque Testers offer several user-friendly features:
- Large Digital Indication: Prevents reading errors and provides clear visibility of torque values.
- Adjustable Time-Out Function: The measuring time can be set from 0.1 to 9.9 seconds in 0.1-second increments, allowing for the measurement of starting torque.
- Bidirectional Measurement: The testers can measure torque in both right and left rotation directions.
- High Accuracy: Achieves high accuracy with ±0.5% of full-scale.
- Protective Cover: The amplifier's panel includes a dustproof protective cover to safeguard the indication panel.
- Easy Operation: Designed for straightforward operation using a micro-computer system.
- Pulse Counter: Built-in for counting pulses, though its use is restricted for impact tools.
Operational Steps:
- Fixing the Pick-up: Securely fix the pick-up to a flat or vertical plate using M10 bolts (M14 for YET-5001C/10001C) or hold it firmly in a vice.
- Connecting Components: Connect the amplifier to the pick-up using the provided cable, plugging it into the sensor connector (11) on the amplifier and the connector (16) on the pick-up.
- Power On: Connect the power cord to an outlet and turn on the power switch (2). The power switch lamp will illuminate.
- Zero Adjustment: Set the mode dial (3) to OFF. Adjust the zero adjust knob (6) left or right until the torque display shows 0.
- Setting Measurement Time (P-P Mode): Use the digital switch (5) to set the desired measurement time in 0.1-second increments, up to 9.9 seconds, for P-P mode measurements.
- Time-Out Indication: When the set time is reached, the time-out indication lamp (4) will light up, signaling to stop the rotation of the measuring tool.
- Mode Selection:
- P-P Mode: For holding peak input signals and displaying values, suitable for impulse wrenches, angle nut runners, and impact wrenches.
- OFF Mode: For continuous data display, used for zero and gain adjustments.
- Gain Adjustment (Calibration):
- Set the mode dial (3) to OFF.
- Ensure the display reads 0 N·m under no-load conditions using zero adjustment.
- Apply a known torque to the pick-up and adjust the gain adjust knob (12) with a screwdriver until the digital display matches the applied torque.
- Printer Output: The device can output torque data, count data, and print orders (L/F) in a text format.
RS-232C Output:
- Transmission System: Start-stop synchronization.
- Transmission Speed: 4800 bps (changeable to 1200, 2400, 9600 bps).
- Communication Way: One-side direction.
- Frame Format: 1 start bit, 8 data bits (changeable to 7 bits), NONE parity (changeable to Even or Odd parity), 2 stop bits.
- Data Format: Torque data, Count data, Print order (C/R) sent in ASCII code.
- Connector: D-Sub 25P on the amplifier side. A cross cable is required for connection to a personal computer.
Maintenance Features
While the manual does not explicitly detail a "maintenance features" section, it provides important notes that contribute to the longevity and accurate operation of the device, which can be considered maintenance-related:
- Avoid Over-Torque: Do not apply torque exceeding the specified maximum for the model. This prevents damage to the pick-up and ensures accurate readings.
- Regular Zero Adjustment: During testing, perform zero adjustment periodically to compensate for temperature changes that might affect readings.
- Handle with Care: Avoid subjecting the amplifier to any shocks, as this can damage internal components.
- Proper Connection Sequence: Ensure all connections are properly made before turning on the power switch.
The design of the device, with its robust construction and clear operational guidelines, aims to minimize the need for frequent maintenance while ensuring reliable performance over time. The inclusion of a dustproof protective cover for the display panel also contributes to the device's durability in various working environments.
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