GAUGE-HOUR 5114689 - Caterpillar

Sensitivity:
A single-turn potentiometer used to set the instrument's overall sensitivity. Maximum sensitivity is obtained with this control fully up.Probe:
A BNC receptacle for connecting probes to the instrument.Power:
This is the main power switch. It controls the application of battery power to the internal circuitry. Replace with a 9V battery, 1U-9534.Specifications
Table 1
       
Instrument Dimensions     8.9 cm (3.5 in) x
18 cm (7.1 in) x
4.8 cm (1.0 in)    
Weight     Handheld unit:
0.0 kg (.8 lb.)
Including carrying case:
1.0 kg (2.2 lb.)    
Operating Frequency     130 kHz fixed    
Battery Requirements     1U-9534 9V Alkaline    
Battery Life     Approximately 4 hours    
Readout    
6.4 cm (2.5 in) wide rectangular meter.    
Operating Temperature     0° to 120° F at 85% RH    Basic Description
The HVOF Identification Tool is a portable, battery operated, fixed frequency eddy current instrument designed specifically to sort between HVOF and chromium coatings.The general-purpose probe supplied with the instrument is designed to make the readings reliable and repeatable.Performance Features
The HVOF Identification Tool offers state-of-the-art design in simplicity of operation and ease of use. Fully derated circuitry provides for reliability and long maintenance-free service. The instrument is housed in a high impact resistant ABS enclosure designed for continuous operation under most environmental conditions.All controls needed for the normal use of the instrument are located on the front panel. These include the POWER switch, BALANCE, and SENSITIVITY controls. The PROBE connector is BNC, the most common in the industry today.The battery compartment, located in the rear of the instrument, houses the 9 V alkaline battery which powers the unit.Operation Instructions
General Operation
The HVOF Identification Tool utilizes the eddy current principle, wherein induced currents are affected by changes in test part characteristics and homogeneity. Variations in material conductivity, permeability, or physical characteristics cause impedance changes in the test probe attached to the bridge circuit. This impedance change causes the bridge to become unbalanced and the resultant amplified unbalanced voltage is indicated by a change in the position of the pointer on the front panel meter.Tool Set-Up
Connect the 396-9343 Probe to the tool Probe connector.
Turn on the power switch.
Set the BALANCE control at mid-range, and the SENSITIVITY control to the lowest setting (down).
Place the probe on the surface of the supplied HVOF half ring (396-9344) and adjust the BALANCE control so that the meter pointer is in the red band of the scale.
Illustration 4 g03342283
Probe on surface of HVOF
Lift the probe off the HVOF half ring, and the meter goes off scale to the right of the red band. Now place the probe back onto the HVOF half ring and verify that the meter needle returns to the red band as in the previous step. This step verifies readings on HVOF. The probe can now be placed on an unknown material. If the test material is chromium, the meter needle will deflect to the far left side of the scale. If the material is HVOF material, the meter needle will deflect to the far right (red band) side