INSTRUCTIONS MODEL AV-1023-C DUAL-CHANNEL LAB PULSE-DELAY GENERATOR SERIAL NUMBER: ____________ __________________________________________________________________ WARRANTY Avtech Electrosystems Ltd. warrants products of its manufacture to be f ree from defects in material and workmanship under conditions of normal use. If, within one year after delivery to the original owner, and af ter prepaid return by the original owner, this Avtech product is found to be defective, Avtech sh all at its option repair or replace said defective item. This warranty does not ap ply to units which have been dissembled, modified or subjected to conditions exceedi ng the applicable specifications or ratings. This warranty is the extent of th e obligation assumed by Avtech with respect to this product and no other warranty or guarantee is either expressed or implied. __________________________________________________________________ EC Declaration of Conformity W W e e A A vt vt e e ch ch E Elle e ct ct ro ro syst syst e e m m s s L Lttd d.. P P..O O.. B B o o x x 5 5 1 1 2 2 0 0,, S Sttn n.. F F O Otttta a w w a a,, O O n ntta a r riio o C C a a n n a a d d a a K K 2 2 C C 3 3 H H 4 4 d d e e cl cl a a r r e e tth h a att tth h e e A A V V - - 1 1 0 0 2 2 3 3 - - C C p p u ullse se g g e e n n e e r r a atto o r r me me e etts s tth h e e iin ntte e n ntt o off D Diir r e e ct ctiive ve 8 8 9 9//3 3 3 3 6 6//E E E E C C ffo o r r E Elle e ct ct r r o o m m a a g g n n e ettiic c C C o o m m p p a attiib biilliitty y.. C C o o m m p plliia a n n ce ce p p e e r rtta aiin n s s tto o tth h e e ffo ollllo o w wiin n g g sp sp e e ci ciffiica cattiio o n n s s a a s s lliist st e e d d iin n tth h e e o offffiici ci a all Jo Jo u u r r n n a all o off tth h e e E E u u r r o o p p e e a a n n C C o o m m mu mu n niittiie e s: s: E E N N 5 5 0 0 0 0 8 8 1 1 - - 1 1 E E mi mi ssi ssi o o n n E E N N 5 5 0 0 0 0 8 8 2 2 - - 1 1 IIm m m m u u n niitty y __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ AV-1023-C SERIES AVTECH 10 MHz DUAL-CHANNEL LAB PULSE-DELAY GENERATOR 10 ns RISE TIMES B SYNC · Two channels with independent amplitudes, polarities, delays and pulse widths DELAY A PW A · Outputs can be inverted, complemented, and added together Fig. 1 A · ± 10 Volt outputs, 10 MHz · 10 ns rise and fall times · User-friendly front panel B · Extremely versatile · Dual pulse generator, delay generator, and DC power supply all-in-one! DELAY B PW B __________________________________________________________________ The versatile Model AV-1023-C is a 10 MHz dual-channel general- Number of channels out: Two purpose lab pulse generator and delay generator providing 0 t o Pulse Repetition Rate: 1 Hz to 10 MHz ±10 Volts, 10 ns rise time, variable pulse widths and delays, self- Amplitude (to 50 Ohms): 0 to ± 10 V (± 5 V if ZOUT = 50 W) explanatory front panel controls and a heavy-duty metal chassis Pulse width (PW): 50 ns to 0.5 sec for low emissions and decades of trouble-free service. Rise time, fall time: 10 ns DC offset: 0 to ± 10 Volts (± 5 V if ZOUT = 50 W) Channels A and B share a common trigger source, but have when used in summing mode independently controlled delays, pulse widths, polarities, and with one channel's PW set at DC amplitudes (see Figure 1). The two output channels can be Source impedance: 1 Ohm or 50 Ohms summed together, if desired. One output connector can s upply Polarity: Positive or negative either A or A+B, and the other can supply B or B+ A. Two Duty cycle (max): >80%, 100% if complemented examples of summing are shown in Figure 2. 100% in PW DC mode Overshoot, undershoot, ringing < ± 3% at amplitudes of >300 mV With same settings as Figure 1: B and slope aberration: with outputs terminated in 50 W. DELAY A PW A Propagation delay: 80 ns to 0.5 sec (Ext trig in to pulse out) A Trigger required (Ext trig mode): + 5 Volts, ³ 40 ns TTL Sync delay, jitter: 35 ns to 0.5 sec, £ ±50 ps or ±0.05% DELAY A PW A (sync out to pulse out) Sync output: +2 Volts, 50 ns, will drive 50 Ohm loads B+A Fig. 2 Signal connectors: BNC Power requirement: 120/240 Volts (switchable) 50 - 60 Hz, 30 Watts DELAY B PW B Dimensions (H x W x D): 100 mm x 215 mm x 315 mm Or, with reduced DELAY B: (3.9” x 8.5” x 14.8”) DELAY A PW A Weight & chassis material: 4.5 kg (10 lbs), anodized aluminum, with blue-grey plastic trim B+A Mounting & Temperature range: Any, +10° C to +40° C DELAY B PW B The AV-1023-C can be triggered internally, with the fre quency controlled by a 7-position range switch and a one-turn fine control, from 1Hz to 10MHz. The AV-1023-C can also be triggere d externally by a TTL (0 to +5V) signal on the TRIG input. A SYNC output provides a narrow pulse to trigger oscilloscopes. The A and B channels are delayed relative to this SYNC output. The pulse widths and delays are variable from 50 ns to 0.5 se c and are controlled by 7-position range switches and one turn fine controls. The pulse widths may also be set to the "DC" mode, allowing each channel to act as a variable ±10 Volt, 200 mA DC power supply, or to supply a DC offset when summed with the other channel. Channels A and B may be polarity-inverted (i.e. from positive to negative voltages) or logic-complemented (i.e. high and l ow voltage levels reversed) to provide a wide variety of output waveforms. The output impedance can be set at 50W (for transmission -line backmatching) or at 1W for maximum voltage output. With this degree of versatility, the AV-1023-C is a general-purpose workhorse - perhaps the only pulser-delay generator that you'll ever need! Fig. 3 demonstrates the versatility of the AV-1023-C, by showing the ease with which the waveforms for measuring semiconductor switching recovery times can be generated: VTEST VTEST, generated by AV-1023-C Fig. 3 VSENSE VSENSE, measurement tRR Model: AV-1023-C __________________________________________________________________ __________________________________________________________________ INSTALLATION VISUAL CHECK After unpacking the instrument, examine to ensure that it has not been damaged in shipment. Visually inspect all connectors, knobs and the handles. Co nfirm that a power cord and instrumentation manual are with the instrument. (If the instrument has been damaged, file a claim immediately with the company that transported the instrument). PLUGGING IN THE INSTRUMENT Examine the rear of the instrument. There will be a male power receptac le, a fuse holder and the edge of the power selector card visible. Confirm th at the power selector is in the correct orientation - it should be marked eith er 120 or 240, indicating whether it expects 120V AC or 240V AC. If it is not set for the proper voltage, remove the fuse and then grasp the card with a pair of pliers and remove it. Rotate horizontally through 180 degrees. Reinstall the card and the correct fuse. In the 120V setting, a 1/2A slow blow fuse is required. I n the 240V setting, a 1/4A slow blow fuse is required. OPERATIONAL CHECK This check is to confirm that the instrument is fully operational. Set the controls to the following values: · INT/EXT switch: INT position · REPETITION RATE outer knob: 10 kHz position · REPETITION RATE inner knob: fully clockwise (max. frequency) · PULSE DELAY outer knobs, both A and B: 50us position · PULSE DELAY inner knobs, both A and B: fully counter-clockwise (minimum delay) · PULSE WIDTH outer knobs, both A and B: 5us position · PULSE WIDTH inner knobs, both A and B: fully clockw ise (maximum pulse width) · AMPLITUDE outer knobs, both A and B: + position __________________________________________________________________ · AMPLITUDE inner knobs, both A and B: fully clockwise (maximum amplitude) · NORM/COMPL switches, both A and B: NORM (normal) position · A/A+B switch: A position · B/B+A switch: B position · ZOUT switch: 1 W Connect a 50 W coaxial cable from the SYNC connector to the TRIG input of an oscilloscope. Connect 50W, 2 Watt loads to both OUT connectors. Connect the left OUT connector to one oscilloscope probe, and the right OUT connect or to another. Position the oscilloscope trace of the left OU T connector above the other trace of the right OUT connector on the oscilloscope screen. Set the oscilloscope to trigger externally with the vertical setting at 5 Volts/div and the horizontal setting at 20 ms/div. Then follow the instructions below and compare what is seen on the oscilloscope to what is described. Only approximate values are needed to confirm operation. STEP CONTROL OPERATION RESULTS 1 POWER Push in (on) Nearly-identical +10V pulses at both outputs, with period 100ms, pulse width 5ms, and rise & fall times of 10 ns. 2 REPETITION Rotate fully counter- Period rises to about 1ms, RATE inner knob clockwise, then fully then falls back to 100 ms. clockwise 3 PULSE DELAY Rotate fully The upper pulse shifts to inner knob A clockwise, then fully the right on the oscilloscope counter-clockwise by 50 ms, then back 4 PULSE DELAY Rotate fully clockwise The lower pulse shifts to the inner knob B and leave it there right on the oscilloscope by 50 ms __________________________________________________________________ 5 PULSE WIDTH Rotate fully counter- The upper pulse narrows to inner knob A clockwise, then fully 0.5 ms, then widens back to clockwise 5 ms. 6 PULSE WIDTH Rotate fully counter- The lower pulse narrows to inner knob B clockwise, then fully 0.5 ms, then widens back to clockwise 5 ms. 7 AMPLITUDE Switch to "-" position, The upper pulse polarity outer knob A then back to "+" becomes negative, then positive. 8 AMPLITUDE Switch to "-" position, The lower pulse polarity outer knob B then back to "+" becomes negative, then positive. 9 NORM/COMP A Switch to "COMP", The upper pulse becomes then back to "NORM" inverted, then non-inverted 10 NORM/COMP B Switch to "COMP", The lower pulse becomes then back to "NORM" inverted, then non-inverted 11 A/A+B Switch to "A+B", then The upper trace becomes a back to "A". double pulse, separated by 50 ms, and then returns to a single pulse. 12 B/B+A Switch to "B+A", then The lower trace becomes a back to "B". double pulse, separated by 50 ms, and then returns to a single pulse. __________________________________________________________________ FRONT PANEL CONTROLS 4 6 10 14 15 3 5 9 13 16 17 18 20 23 8 12 21 1 24 2 25 7 11 19 22 (1) POWER switch. The POWER pushbutton switch applies AC prime power to the primaries of the transformer, turning the instrument on. (2) INT/EXT switch. In the "INT" position the instrument is internally triggered (i.e. the pulse repetition frequency is controlled by the REPETITION RATE fro nt panel controls). In the "EXT" position the instrument is triggered by a TTL pulse (0 to +5V) on the "TRIG" connector. (3) REPETITION RATE outer knob. This selects one of the seven pulse repetition rate ranges: 1 Hz - 10 Hz 10 Hz - 100 Hz 100 Hz - 1 kHz 1 kHz - 10 kHz 10 kHz - 100 kHz 100 kHz - 1 MHz 1 MHz - 10 MHz (4) REPETITION RATE inner knob. This varies the pulse repetition rate w ithin the selected range. (5) PULSE DELAY A outer knob. This selects one of the seven delay range s for channel "A": 0.05 ms - 0.5 ms 0.5 ms - 5 ms __________________________________________________________________ 5 ms - 50 ms 50 ms - 500 ms 500 ms - 5 ms 5 ms - 50 ms 50 ms - 0.5 sec (6) PULSE DELAY A inner knob. This varies the channel "A" delay within the selected range. (7) PULSE DELAY B outer knob. This selects one of the seven delay range s for channel "B". (8) PULSE DELAY B inner knob. This varies the channel "B" delay within the selected range. (9) PULSE WIDTH A outer knob. This selects one of the seven pulse width ranges for channel "A": 0.05 ms - 0.5 ms 0.5 ms - 5 ms 5 ms - 50 ms 50 ms - 500 ms 500 ms - 5 ms 5 ms - 50 ms 50 ms - 0.5 sec DC (i.e. constant output) (10) PULSE WIDTH A inner knob. This varies the channel "A" pulse width within the selected range. (11) PULSE WIDTH B outer knob. This selects one of the seven pulse widt h ranges for channel "B". (12) PULSE WIDTH B inner knob. This varies the channel "B" pulse width within the selected range. (13) AMPLITUDE A outer knob. This switch selects the output polarity (p ositive or negative) of channel "A". (14) AMPLITUDE A inner knob. This varies the output amplitude of channe l "A" between 0 and 10 Volts. (15) AMPLITUDE B outer knob. This switch selects the output polarity (p ositive or negative) of channel "B". (16) AMPLITUDE B inner knob. This varies the output amplitude of channe l "B" between 0 and 10 Volts. __________________________________________________________________ (17) NORM/COMP A switch. In the "NORM" position, channel "A" is logical ly non-inverted. In the "COMP" position, channel "A" is logically compleme nted (i.e. inverted). In the complemented state, the high and low voltage levels a re reversed relative to the "NORM" state. The polarities do not change. (18) NORM/COMP B switch. In the "NORM" position, channel "B" is logical ly non-inverted. In the "COMP" position, channel "B" is logically compleme nted (i.e. inverted). In the complemented state, the high and low voltage levels a re reversed relative to the "NORM" state. The polarities do not change. (19) A/A+B switch. In the "A" position, the leftmost OUT connector (ite m 22) outputs channel "A". In the "A+B" position, this connector provides the sum of channels "A" and "B" instead. (20) B/B+A switch. In the "B" position, the rightmost OUT connector (it em 23) outputs channel "B". In the "B+A" position, this connector provides the sum of channels "B" and "A" instead. (21) Z O UT switch . This switch sets the output impedance of the two main ou tputs (items 22 and 23). The output impedance can be 1W or 50W. (22) OUT, left connector. This connector provides either "A" or "A+B" o utputs, depending on this position of the A/A+B switch. The output impedance is set by the ZOUT switch. (23) OUT, right connector. This connector provides either "B" or "B+A" outputs, depending on this position of the B/B+A switch. The output impedance is set by the ZOUT switch. (24) SYNC connector. This output supplies a TTL-level pulse to trigger oscilloscopes or other measurement equipment. The output pulse width is nominally fixed at 50ns. (25) TRIG connector. If the INT/EXT switch (item 2) is in the "EXT" pos ition, the external TTL-level trigger should be applied to this input. When the IN T/EXT switch is in the "INT" position, this input has no effect. However, it should be left unconnected to avoid electromagnetic interference with the internal clo ck. __________________________________________________________________ GENERAL INFORMATION BASIC PULSE CONTROL This pulse-delay generated can be triggered by its own internal clock o r by an external TTL trigger signal. In either case, three output channel s respond to the trigger: SYNC, A, and B. The SYNC pulse is a fixed-width pulse t hat is generated immediately after triggering. This pulse can be used to trigg er oscilloscopes or other measurement systems. The two main output channel s, A and B, are referenced to the SYNC pulse. This relationship is illustrat ed in Figure 4. SYNC B DELAY A PW A AMPLITUDE AND A POLARITY A B AMPLITUDE AND POLARITY B DELAY B PW B Figure 4 - Basic Output Pulses Each of the parameters indicated in Figure 4 can be varied with a front panel control. SUMMING OUTPUTS The output connectors can supply A and B directly, or they can be added together, and the two output connectors can be used to supply two of A, B, or A+B=B+A. This allows complex waveforms to be constructed. Some examples are shown in Figure 5. Example 1 Example 2 Example 3 B A A A B B B A+B A+B A+B Figure 5 NORM/COMP MODES __________________________________________________________________ The pulses of channels A and B may be of either polarity (i.e. positive or negative). In addition, the NORM/COMP switches allow pulses to be inver ted logically - the high and low voltages can be swapped. This is illustrat ed in figure 6. Example 1 Example 2 B +10V 0V NORM NORM 0V -10V +10V 0V COMP COMP 0V -10V Figure 6 OUTPUT IMPEDANCE The output impedance can set to be 1W or 50W. The 50W position is usefu l for driving 50W transmission lines since this output impedance will provide back- matching, which suppresses transmission line reflections. Note however that when driving a 50W load with the switch in the 50W position will reduce the output voltage by a factor of 2, due to a voltage divider effect. The 1 W position eliminates this voltage reduction. ELECTROMAGNETIC INTERFERENCE To prevent electromagnetic interference with other equipment, all used outputs should be connected to shielded 50 Ohm loads using shielded 50 Ohm coaxial cables. Unused outputs should be terminated with shielded 50 Oh m BNC terminators or with shielded BNC dust caps, to prevent unintentional electromagnetic radiation. All cords and cables should be less than 3m in length. TOP AND BOTTOM COVER REMOVAL The top cover of the instrument may be removed by removing the four Phillips screws on the top panel. With these four screws removed, the t op panel may be slid off by pulling it towards the rear. The bottom panel may be similarly removed. __________________________________________________________________