(Wheatstone Bridge) One meter long, provided with four gaps/ two gaps, plywood base and sunmica top, graduated scales, constantan wire is streched on top of meter scale brass C.P. Strip aend gaps can be closed by removable brass strips and brass terminals are provided to reduce resistance.
With Pencil Jockey
With pressing Jockey Brass
It consists of nickel plated brass strips and connecting pieces with 4mm socket terminals, fitted on wooden base. Length 100cm long with plastic scale. Supplied with jockey.
1. DSHQ48 High Resolution Seismograph is produced on the basis of DSHQ24 seismograph and combined with China national situation to work under a new type Chinese WINXP system. The design and manufacturing into the valuable experience of seismic instruments, also absorbs today's advanced electronic technologies and design concepts, it is a leading seismograph multi-function, high accuracy, high speed, high reliability, good man-machine interface features and scalability. 2. The Instrument can be used a hammer, electric spark or explosion as the excitation source, with exploration depth from a few meters to a thousand meters; also delay function can be used to obtain Department of stratum deeper underground seismic data. 3. Applicable Methods are: Reflection, refraction, surface wave exploration, pile testing, microtremor measurement, high-density seismic imaging, vibration testing, measurement and shear-wave seismic exploration methods, widely used in water conservancy, electric power, railways, bridges, urban construction, transportation and other areas of engineering geological exploration, also applies to oil, coal, uranium mining and groundwater exploration and other fields. Main Applications • Reflection and Refraction Exploration: Bedrock embedded depth, shape and regularities of distribution research, hydrological and engineering and environmental geological basic investigation. Shear Wave Velocity Test: Measurement of rock mass elasticity parameters, etc. • Surface Wave Prospecting: Cover layer investigation; weathering zone investigation; underground cavity and diseased geologic body survey; subgrade, levee, slope disease investigation. • High-density Multi-wave Seismic Imaging: Cavity investigation of ground base and subgrade (roadbed), cave surveying, etc. • Quality Inspection of Civil Engineering; Bridge pier and building pile foundation detecting, etc. • Safety Evaluation of City Blasting Vibration: All kinds of safety monitoring of blasting vibration. • Main FeaturesAdopt the latest high-speed, high-precision real 24-bit A/D converter. Maximum sampling interval for 48 channels in simultaneous sampling is 31.25us, reaching international advanced level. • Maximum sampling interval for single channel is up to 10us. Can easily complete seismic data acquisition, and data processing • Not only use the advanced wave filter with ultra-low distortion performance, better than 120 dB, with external suppression (cut-off frequency automatically changes with sampling frequency); meanwhile, various digital wave filters (high, low, band pass wave filters) are set in the software, with their cut-off frequency being set artificially. • Brand-new overall structure design, which allows more reasonable view to facilitate the operation. • Support coverage measurement; • Provided with overlaying switch and overlaying cable manufactured by our factory, the application in various reflection, refraction, reflex measurement for field exploration can be facilitated, thus greatly improving the efficiency of field work. • DSHQ48 high-resolution seismograph can support 12-channel and 24-channel overlaying measurement without external configuration Built-in unique instrument detection system. Self-checking acquisition, data computing, self-checking report can automatically generated the output. Field make-and-break test for geophone and jug lines, full waveform noise monitoring Support multiple (at Windows interface) processing software: Superficial reflex processing, refraction, surface wave shear wave package, blasting, pulsating, high-density seismic imaging processing software Clock: Annual timing clock, file recording time will be stored in along with parameters. Main Technical Specifications Computer Configuration: Military Grade PC104 Control Computer P4 (933MHz); Memory: 256MB; Hard Disk: no smaller than 80GB Operating System: win-XP Display: 1024x768 dot matrix, high brightness TFT (true color) LED. Input Device: Equipped with suitable field-use membrane keyboard and touch screen; can also be connected with PS / 2 computer keyboard and mouse; provided with handwriting tablet. Interface: Dual USB interface, PS/2 keyboard, mouse interface, parallel port, Ethernet port, etc. Removable Storage: USB disk, or adopting mobile hard disk drive, USB mobile drive, etc. Frequency Response Range: 0.1Hz~4kHz Noise: smaller than 1 V at full-frequency state Sampling Time Delay: 0~9999ms Conformity: amplitude conformity better than ¡À0.02%; phase conformity: better than ¡À0.01ms Sampling Rate: 10¦Ìs/31.25¦Ìs/62.5¦Ìs/125¦Ìs/250¦Ìs/500¦Ìs/1 ms/2 ms/4 ms/8 ms/16ms/32ms-400ms several taps Number of Sampling Points: 512, 1024, 2048, 4096, 8192, 16384, etc., maximum record up to 32768; Preamplifier Gain: Every six channels as a group, optionally chosen by software: 64 times (36dB), 16 times (24dB), 4 times (12dB), 1times; A/D Converter: Adopt the latest, ultra high speed ¦²-¦¤24 bit A/D converter; Alias Filter: Automatic tracking along with the sampling rate; -3dB, down to 120dB at the place with 0.216 times of sampling rate; and provided with various digital wave filters, cutoff frequency (at the place with -3dB) if required Supported Data Format: SEG-2, SEG-Y, CSP Trigger Mode: Internal and external triggered by hammer switch; triggered via blasting, and electric spark; also triggered by wire-breaking or connecting
Product description Oil dielectric loss tester is a high-precision instrument, which can be applied to measure dielectric loss angle and Volume Resistivity of insulating oil etc. It is integrated by oil cup for dielectric loss, temperature-control equipment, temperature sensor, test-bridge for dielectric loss, AC trial electrical source, standard capacitor, high resistance meter and DC high-voltage power etc. The most advanced heating mode of high frequency induction is applied to the heating part of this instrument, which has the advantage of non-contact of oil cup and heating unit, homogeneous heating, quick velocity and convenient control etc. Technical index Oil cup technical specifciations: Distance between High Voltage terminal and Low Voltage terminal 2mm Capacitance of Empty Cup 602PF The Highest testing voltage Industrial Frequency 2000V Dielectric Loss of Empty Cup tg1 10-4 Liquid capacity About 40ml Electrode Material Stainless Steel Volume 70mm(D) 120mm 1 Condition of Uss 2 Power Source AC 110V10% Without Frequency Limit 3 AC High Voltage Output 4 DC High Voltage Output Temperature Control Induction Stove Maximal Power 500W 6 Temperature Control Range
To study Efficiency & Ripple factor in Half wave, Full wave & Bridge rectifier on application of load & filters, instrument compresies of AC power supply, two MO 65 moving coil meter 20V and 250 mA to measure output voltabe & output cuurent, four diiodes, fitlr cicuit kit, load resistance ca, be selected using band switch
