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PRODUCT SHOWCASE New digital scopes from Tektronix Tektronix has moved to consolidate its position in the digital oscilloscope field, particularly at the low price end of the market. It has announced three new models of its TDS300 series with more performance and the inclusion of features which were previously costly options. Of special interest to first-time digital scope buyers, the new TDS300 series represent a doubling in their performance standard with no increase in price. The three new models are the 100MHz TDS340, 200MHz TDS360 and 400MHz TDS380. All three scopes feature the Tektronix patented Digital Real Time (DRT) over­sam­pling technology which effectively eliminates aliasing and ena­bles single shot waveform capture at the instrument’s rated bandwidth. By way of explanation, until the introduction of DRT, all digital scopes had poor performance in single shot mode. For example, a scope with 100MHz bandwidth and a sampling 60  Silicon Chip rate of 300Ms/s (megasamples/second) would be hard-pressed to provide a 3MHz bandwidth in single shot mode. The problem is the sampling process itself; a typical digital scope cannot generate enough samples to enable a single shot waveform to be accurately repro­duced. The Tektronix approach to this problem has been to essen­tially overwhelm it with huge sampling rates. Hence, the sampling rate of these new TDS300 series scopes is five times their analog bandwidth: the 100MHz TDS340 samples at 500Ms/s; the 200MHz TDS360 at 1Gs/s and the 400MHz TDS380 at 2Gs/s (Gigasamples/second). As with earlier models, the TDS300 series offer four acqui­ sition modes: sample, envelope, average and peak detect. Video and edge triggering capabilities are built-in, along with the ability to capture transients down to one nanosecond. For users to who need to capture and store many waveforms for future reference, the TDS360 and 380 models come with a 3.5 inch floppy disc drive which is PC DOS compatible. It can store waveforms in a variety of formats which can then be taken into many programs for analysis or subsequent printout. Indeed, the provision of the disc drive effectively makes the need for a printer port no longer necessary in most circumstances. As a further attraction, all three TDS300 models include Fast Fourier Transform (FFT) capability at no extra cost. Pre­ viously a costly option on high end digital scopes, FFT is useful for analysing harmonic content in waveforms, noise in mixed digital/ analog systems, line current harmonics and so on. Also available as options are a GPIB port, RS-232 serial and Centronics parallel ports, and a VGA monitor output. The new TDS300 series scopes will be available from Tektro­nix distributors from the 1st December 1995. The TDS340 has a suggested retail price of $3700; the TDS360, $5200; and the TDS380, $6800. These prices do not include sales tax. All models come with a 3-year warranty. Digital power meters from Yokogawa The recently introduced WT110/ WT130 digital power meters from Yokogawa are compact, low-cost instruments offering high performance. Capable of operating at DC or AC over a bandwidth of 10Hz to 50kHz, the meters have a basic accuracy of ±0.25%. Integrated power (Wh) and current (Ah) can be displayed continu­ ously on the instruments’ 3-line, 7-segment LED displays. This standard function allows the display of integrated power and current with positive and any negative values measured separately. The decimal point position automatically moves during integration. This enables high resolution measurements to be carried out over short periods. The instruments include GPIB and RS-232C interfaces and conform to IEC1010 safety standards, with isolation between the voltage and current terminals to 3.7kVAC/50Hz for one minute and surge resistance to 300A, 2kV/1 cycle (50Hz). For further information, contact Yokogawa Australia, 25-27 Paul St North, North Ryde, NSW 2113. Phone (02) 805 0699. 750 watt power supply The Kepco RCW series is a group of seven 750W single output switching power supplies that incorporate FET-based forward converters. The fan-cooled modular style switchers have adjust­ able outputs based around nominal voltages of 3.3, 5, 12, 15, 24, 28 & 48V DC, and are able to source currents of 15-150A, depend­ing on the mod­el. They can be operated at temperatures ranging from -10°C to +71°C, delivering full power at 50°C. With a switching frequency of 160kHz, the RCW converters provide high efficiency at either 240 or 120 VAC. The input voltage can be anywhere between 85V and 264V and is sensed au­tomatically so that no user selection is necessary. An EMI filter is built-in to ensure that conducted noise meets FCC Class A limits. In addition, an active power factor correction circuit ensures that current is drawn over the entire mains cycle so that the RCW meets the IEC’s harmonic current limit (IEC 555-2). To allow for paralleling, a current share circuit is pro­vided to equalise the outputs from as many as three RCW series units together. A square type overcurrent limiter is backed by an undervoltage detector that shuts down the RCW when an overload persists for more than 40 seconds; over­voltage shutdown is in­stant­aneous. In either case, reset is achieved by removing the mains power for about 40 seconds. Overvoltage, under­ volt­ age, fan stop and input alarm are all flagged by red LEDs on the front panel. For more information on the Kepco RCW series, contact Obiat Pty Ltd, 129 Queen St, Beaconsfield, NSW 2014. Phone (02) 698 4111 or fax (02) 699 9170. December 1995  61 Outdoor speaker from Akai Designed for both inside and outside sound reinforcement applications, Akai’s SRM-500 outdoor loudspeakers can be conveniently fitted under awnings or mounted on walls. Capable of handling up to 100 watts, the SRM-500s use a 120mm carbon poly­propylene woofer and a 32mm dome tweeter. Covered by a twelve month parts and labour warran­ty, the SRM-500s are avail- Programmer for AT89C2051 flash micro AirBorn Electronics has announced the PG2051 development programmer for the At89C2051 microprocessor. The At89C2051 is a 20-pin 8051 compatible microprocessor with 2Kb of flash memory. The PG2051 erases, programs and verifies AT89C2051 chips in six seconds. The programmer may be connected to a PC or other host by 62  Silicon Chip able at Akai dealers and selected department stores. For further information, contact Akai on (02) 763 6300. a serial cable and the data download­ed in Intel hex format. The programmer will test, erase, program, verify, write protect and security protect as it receives the file, according to the settings on its DIP switches. It also features a test switch which allows the owner to check if an AT89C2051 is blank, working, programmed or failed.. Flash memory means the micro itself can be reprogrammed quickly and easily. Previously, designers had the difficult choice of higher cost UV erasable chips or cheaper One-Time-Programmable chips. The UV chips were often several times the OTP price but could be reused if a program change was needed. The AT89C2051 is priced even more attractively than most of the OTP chips and erases in milliseconds. The At89C2051 executes all of the 8051 instructions and has all the peripherals and registers. This means the large quantity of development software and library and applications code already available for the 8051 can be used with this new microprocessor. AirBorn Electronics is selling the PG2051 program with a datasheet and plugpack for an introductory price of $188 (ex tax). A complete evaluation kit is also available, for $233 (ex tax). It includes the programmer and plugpack, two At89C2051 devices, a small prototype board to get an At89C2051 up and running and a diskette with some example ASM code, a shareware assembler and a dis-assembler. For further information, contact AirBorn Electronics, Suite 201, 19-21 Berry St, North Sydney 2060. Phone (02) 9925 0325. Boundary microphone from Amber Technology Amber Technology has announced the new Beyerdynamic MPC 65 acoustic boundary microphone. Measuring just 86 x 61 x 31mm, the small and unobtrusive MPC 65 is ideal for recording and sound reinforcement applications requiring high quality reproduction of speech, including tele­ phone and video conferencing systems, boardrooms, courtrooms and churches. Beyer claim the MPC 65 provides higher gain before feedback than typical boundary microphone designs. It has a semi-cardioid response and an integral low-cut filter to remove low frequency rumble and unwanted surface-bound noise. The microphone requires 12-48VDC phantom power and may be used free standing or surface-mounted via an integrated connector in its base. The Beyer MPC 65 is available with a built-in or external preamplifier, terminated with a captive cable, XLR or jack con­nector and in matte black or off-white finishes. Recommended retail prices start at $599. For further information, contact Amber Technology, Unit B, 5 Skyline Place, Frenchs Forest, NSW 2086. Phone (02) 9975 1211 or fax (02) 9975 1368. AUDIO TRANSFORMERS Mini pistol grip driver Released by Scope Laboratories of Melbourne under their Cadik brand (code SD-CCC-811), this 5-in-1 pistol Manufactured in Australia Comprehensive data available Harbuch Electronics Pty Ltd 9/40 Leighton Pl. HORNSBY 2077 Ph (02) 476-5854 Fx (02) 476-3231 grip driver combines small size for the tool box, good ergonomic design and a ratchet/reversible func­ tion. Three slotted and two Phillips bits are stored in the handle. For further information, contact Scope Laboratories, 3 Walton Street, Airport West, Vic 3042. Phone (03) SC 9338 1566. ANOTHER GREAT DEAL FROM MACSERVICE 100MHz Tektronix 465M Oscilloscope 2-Channel, Delayed Timebase VERTICAL SYSTEM Bandwidth & Rise Time: DC to 100MHz (-3dB) and 3.5ns or less for DC coupling and -15°C to +55°C. Bandwidth Limit Mode: Bandwidth limited to 20MHz. Deflection Factor: 5mV/div to 5V/div in 10 steps (1-2-5 sequence). DC accuracy: ±2% 0-40°C; ±3% -15-0°C, 40-55°C. Uncalibrated, continuously variable between settings, and to at least 12.5V/div. Common-Mode Rejection Ratio: 25:1 to 10MHz; 10:1 from 10-50MHz, 6cm sinewave. (ADD Mode with Ch 2 inverted.) Display Modes: Ch 1, Ch 2 (normal or inverted), alternate, chopped (250kHz rate), added, X-Y. Input R and C: 1MΩ ±2%; approx 20pF. Max Input Voltage: DC or AC coupled ±250VDC + peak AC at 50kHz, derated above 50KHz. HORIZONTAL DEFLECTION Timebase A: 0.5s/div to 0.05µs/div in 22 steps (1-2-5 sequence). X10 mag extends fastest sweep rate to 5ns/div. Timebase B: 50ms/div to 0.05µs/div in 19 steps (1-2-5 sequence). X10 mag extends maximum sweep rate to 5ns/div. Horizontal Display Modes: A, A Intensified by B, B delayed by A, and mixed. CALIBRATED SWEEP DELAY Calibrated Delay Time: Continuous from 0.1µs to at least 5s after the start of the delaying A sweep. Differential Time Measurement Accuracy: for measurements $900 of two or more major dial divisions: +15°C to +35°C 1% + 0.1% of full scale; 0°C to +55°C additional 1% allowed. TRIGGERING A & B A Trigger Modes: Normal Sweep is triggered by an internal vertical amplifier signal, external signal, or internal power line signal. A bright baseline is provided only in presence of trigger signal. Automatic: a bright baseline is displayed in the absence of input signals. Triggering is the same as normal-mode above 40Hz. Single (main time base only). The sweep occurs once with the same triggering as normal. The capability to re-arm the sweep and illuminate the reset lamp is provided. The sweep activates when the next trigger is applied for rearming. A Trigger Holdoff: Increases A sweep holdoff time to at least 10X the TIME/DIV settings, except at 0.2s and 0.5s. Trigger View: View external and internal trigger signals; Ext X1, 100mV/div, Ext -: 10, 1V/div. Level and Slope: Internal, permits triggering at any point on the positive or negative slopes of the displayed waveform. External, permits continuously variable triggering on any level between +1.0V and -1.0V on either slope of the trigger signal. A Sources: Ch 1, Ch 2, NORM (all display modes triggered by the combined waveforms from Ch 1 and 2), LINE, EXT, EXT :-10. B Sources: B starts after delay time; Ch 1, Ch 2, NORM, EXT, EXT :-10. Optional cover for CRT screen – $35 through the vertical system. Continuously variable between steps and to at least 12.5V/div. X Axis Bandwidth: DC to at least 4MHz; Y Axis Bandwidth: DC to 100MHz; X-Y Phase: Less than 3° from DC to 50kHz. DISPLAY CRT: 5-inch, rectangular tube; 8 x 10cm display; P31 phosX-Y OPERATION phor. Graticule: Internal, non-parallax; illuminated. 8 x 10cm Sensitivity: 5mV/div to 5V/div in 10 steps (1-2-5 sequence) markings with horizontal and vertical centerlines further marked in 0.2cm increments. 10% and 90% for rise time measurements. Australia’s Largest Remarketer of markings Graticule Illumination: variable. Beam Test & Measurement Equipment Finder: Limits the display to within the graticule area and provides a visible 3167. Tel: (03) 9562 9500; Fax: (03) 9562 9590 display when pushed. MACSERVICE PTY LTD 20 Fulton Street, Oakleigh Sth, Vic., **Illustrations are representative only. Products listed are refurbished unless otherwise stated. December 1995  63