Specials

Strain Gauge Instrumentation often has built in precision resistors to complete the Wheatstone Bridge Circuit. If this is not the case a bridge completion module (BCM) is preferred choice and can be used with 1/4 or 1/2 bridge strain gauges.

• Ultra precision BCM equals or out performs all other industry units
• Ultra stable and ultra reliable
• Uses Bulk Metal® Z-foil resistors for absolute tolerances of .01% and match tolerances of .005%
• Absolute TCR to 1 ppm/°C and matched TCR to 0.5 ppm/°C
• Weather proof and extremely rugged but light and portable
• Impervious to stress/strain or shock/vibration and with RFI shielding. ESD safe to 25KV
• Available in any complex resistor value (100R to 100K) to 6 digits with an MOQ of 1 pc.
• Various versatile mounting options available - see below, please contact us for more options.

Circuit instability is a major concern for all strain gauges. Precision ¼ bridge and ½ bridge strain gauges require very accurately matched TCR and tolerance, bridge completion resistors to operate properly. Our matched resistor sets are the ideal solution for strain gauge bridge completion requirements.

• Absolute tolerances of 0.01% and matched tolerances of 0.005%
• Absolute TCR ❮2ppm/C° and matched TCR <0.5ppm/C°
• PCR ❮5ppm @ rated power
• ESD safe to 25KV
• Any value up to 6 digits with moq 1pc
• Ultra-precise
• Ultra-stable
• Ultra-reliable

All Strain Gauges and Load Cells require regular calibration which is commonly achieved by connecting the appropriate value of shunt calibration resistor in parallel with one of the bridge resistors. Our Shunt Calibration Module provides an easy, cost effective, very accurate way to do this.

• Simple to use with no maintenance
• Inexpensive & Rugged
• Does not require calibration before each use
• Any value resistance to six digits and 0.005% tolerance is available with a moq of 1pc
• Colour coded plugs for ease of identification in the field.
• Ultra-precise
• Ultra-stable
• Ultra-reliable

Challenging electrical, mechanical & environmental specifications can be achieved by a custom Charcroft passive assembly. Combining one of the widest passive line-cards with a range of in-house assembly processes, and some creative thinking, Charcroft can design and build a passive assembly to your exacting specifications.

• 5-15 day leadtime for prototypes
• Custom footprints & lead-pitches
• Protection against harsh conditions
• Capacitor/resistor assemblies with optional flying leads
• Matching to electrical, mechanical & environmental parameters

7 Days

• 0.01% radial VPG Bulk Metal® Foil resistors
• 1%+ radial non-release & BS Multilayer Ceramic Capacitors
• 5%+ radial CECC Multilayer Ceramic Capacitors
• Charcroft Audio Resistors

15 Days

• 0.005% radial VPG Bulk Metal® Foil resistors
• 0.01% Z Foil VPG Bulk Metal® Foil resistors

Flying leads can be supplied as an option on cable-to-board and cable-to-panel connectors to eliminate tooling, labour costs, and wire wastage. This option is available on signal, power and RF connectors for test and measurement, mil-aero, industrial and other applications. Leads are 24 AWG insulated with black PTFE to BS3G210 Type A, and optional heat-shrink sleeving at the crimp termination. For RF applications, lead options include RG, semi-rigid.

Flying leads can be added as an option to the following connector series:

• Ranges include Vitelec & Johnson Components
• Applications from DC to 40GHz
• Wide range of commercial and high-performance connector styles

• Includes ultra-miniature connectors with quality snap-on connection
• Cable options from RG & semi-rigid to ultra-low-loss flexible