Summary of Contents for Stanford Research Systems DG535
- Page 1 MODEL DG535 Digital Delay / Pulse Generator 1290-D Reamwood Avenue Sunnyvale, CA 94089 U.S.A. Phone: (408) 744-9040, Fax: (408) 744-9049 Copyright © 1994, 1997, 2000 All Rights Reserved Revision 2.5 11/2000...
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Page 2: Table Of Contents
DG535 DIGITAL DELAY / PULSE GENERATOR OPERATION AND SERVICE MANUAL Table of Contents CONDENSED INFORMATION Safety and Preparation for Use Quick-Start Instructions DG535 Specifications Abridged GPIB Command List viii Error Status Byte Definition Instrument Status Byte Definition GUIDE TO OPERATION... - Page 3 Time Delay vs Repetition GPIB PROGRAMMING Detailed Command List Initialization Commands Status Commands Error Status Byte Definition Instrument Status Byte Definition Display Control Commands Delay and Output Commands Delays Output Control Trigger Commands Store and Recall Commands TROUBLESHOOTING LCD Contrast Cold-Boot Quick Test Output Levels...
- Page 4 Frequency Synthesizer Line Trigger Trigger Selection Trigger Circuits Trigger Sequence Overview of the Delay Channels Jitter Compensation Jitter Precharge and Sample & Hold Kickpulse The T0 Delay Channel A's Digital Delay Analog Delays Reset Cycle and Status Bits Output Drivers Offset Control Impedance Control Gate Output Drivers...
- Page 5 Sheet #11 Digital to Analog Converter and Multiplexer Sheet #12 Power Regulators Front PCB Optional Outputs PCB Table of Figures Figure - 1 DG535 Rear Panel Page - 2 Figure - 2 DG535 Front Panel Page - 3 Figure - 3 Maximum Error vs. Time Delay...
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Page 6: Safety And Preparation For Use
LINE CORD LINE VOLTAGE SELECTION The DG535 uses a three wire power cord for connection to the power source and to a The DG535 operates from a 100V, 120V, protective ground. The exposed metal parts of 220V or 240V (50 or 60 Hz) ac power source. -
Page 7: Quick-Start Instructions
QUICK START INSTRUCTIONS (1) Make certain that the correct line voltage is selected on the rear panel. (2) Press the power button "in" to turn on the unit. (3) Press the RECALL Menu key, the "0" digit, and the EXC key in sequence to recall default settings. -
Page 8: Dg535 Specifications
DG535 SPECIFICATIONS DELAYS Channels Four independent delay outputs : A, B, C and D Range 0 to 999.999,999,999,995 seconds Resolution 5 ps Accuracy 1500 ps + timebase error x delay Timebase Standard: 25 ppm crystal oscillator Optional: 1ppm TCXO (Opt. 03) External: user provides 10.0 MHz reference... -
Page 9: Abridged Gpib Command List
ABRIDGED COMMAND LIST INITIALIZATION Clear instrument GT{i}{,j}{,k} Specify one to three ASCII codes which will terminate each response from the DG535 STATUS Returns the Error Status byte ES i Returns bit i of the Error Status Byte Returns the Instrument Status byte... -
Page 10: Error Status Byte Definition
ERROR STATUS BYTE INSTRUMENT STATUS BYTE Bit Description Bit Description 7 Always zero 7 Memory contents corrupted 6 Recalled data was corrupt 6 Service request 5 Delay range error 5 Always zero 4 Delay linkage error 4 Trigger rate too high 3 Wrong mode for the command 3 80MHz PLL is unlocked 2 Value is outside allowed range... -
Page 11: Guide To Operation
(0 to 1000 s), and low jitter (50 ps to the operation of thumbwheel switches. The rms) recommend the DG535 as the solution to numeric mode (NUM) allows the data to be entered many difficult timing problems in science and as a numeric string. -
Page 12: Pulse Outputs
GPIB menu. OPTION 06 - TRIGGER INHIBIT INPUT 10.000 MHz REFERENCE If the DG535 was ordered with the option 06, there will be a BNC connector located directly Internal or external references may be used as the under the power button on the front panel to timebase for the digital delays. -
Page 13: Option 02 - ±35 Volt Rear Panel Outputs
In this case, the average current is given by: To use the timebase in one DG535 as the timebase for several DG535's, set the switch on I = 2Vtƒ / Z the "master unit" to the INT position. Use coax cables to daisychain the 10.000 MHz output... -
Page 14: Trigger Menu
TRIGGER TRICKS Single-Shot (Exc) There are several techniques that may be used to Rate =10000.000Hz extend the versatility of the DG535's trigger modes. Pulses/Burst Periods/Burst The Jitter of the delay outputs will be reduced by about a factor of two (to less than 25 ps rms) if the... -
Page 15: Delay Menus
D's delay to 95 ms. Once triggered, the incremented. Depress the #5 and either the up or DG535 will ignore other triggers until all down keys simultaneously. The step rate will be channels have timed out, hence every sixth Line approximately 4 Hz, and may vary during a scan. -
Page 16: Ab And Cd Outputs
AB and -AB outputs. It that control the DG535. is very important that if a 50Ω load is specified, that a 50Ω load be present on BOTH the AB The GPIB address may be set in the second menu. -
Page 17: Store And Recall Menus
STORE and RECALL MENUS which detract from this ideal performance, are discussed here. There are ten storage locations from which setup data may be recalled. One of these ACCURACY locations, number 0, contains default setup data, the other nine locations contain setup The error in the time delay between any two outputs information that was stored by the user. -
Page 18: Timebase Drift
DG535 using an internal timebase, Some of these noise sources are common to all and for a DG535 with an ideal external source. The of the channels, others are independent. The jitter for time delays longer than 10 seconds, using... -
Page 19: Time Delay Vs Repetition
other. The pulling of one channel by the other is typically less than 100 ps. TIME DELAY vs REPETITION RATE The time delay for any channel may change by 200 ps as the pulse repetition rate is changed from single shot to the maximum rate of 1/(1 µs + longest delay). -
Page 20: Gpib Programming
Example: if a command communication buffer are cancelled. was sent to the DG535 with too many parameters, bit 1 would be set. If the ES command is used to Also, blanks are ignored, case is ignored,... -
Page 21: Instrument Status Byte Definition
GPIB. below. Example: if the trigger rate to the DG535 is too high, bit 4 of the instrument status byte Bit 4: This bit is set if the trigger rate is too fast. The will be set. -
Page 22: Display Control Commands
Bit 1: This bit is set if the unit is currently busy from being generated by the DG535. To re-enable with a timing cycle. Unlike all of the other the service request, the controller must again set the status bits, it is not latched (rather it reflects the service request mask with the "SM i"... - Page 23 i j k Display Example Comment 2 0 0 T0 A B AB C D CD Output Menu Select 2 1 0 T0: Load = 50Ω T0 Output Control Menus 2 1 1 T0: TTL NIM ECL VAR 2 1 2 T0: Amplitude = +1.23 (Only if VAR selected) 2 1 3...
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Page 24: Delay And Output Commands
(using the SC command) and message on the DG535's liquid crystal display. then increment/decrement the digit (using the IC As with all data that is sent to the DG535, command). spaces will be stripped from the transmitted... -
Page 25: Trigger Commands
ECL is selected, the polarity of the logic output TRIGGER COMMANDS is specified by the "OP" command. If the VARiable output mode is selected, then the TM {i} output amplitude and offsets may be set with the Set Trigger Mode to Int, Ext, SS or Bur (i=0,1,2,3). "OA"... -
Page 26: Store And Recall Commands
and a trigger input impedance of 50Ω to ground. at least one larger than the Burst Count. Example: These trigger conditions would be appropriate the command "TM 3; TR 1,1E5; BC 100; BP 101" for triggering on the rising edge of an ECL logic sets the burst mode of operation with a trigger rate pulse (if it is able to drive a 50Ω... -
Page 27: Troubleshooting
will blink once each time the "EXC" key is pressed. TROUBLESHOOTING Now press the left arrow key (the "4" key) twice to select the Internal trigger source. The default trigger To start, make sure that the power entry module rate is 10 kHz, so the TRIG and BUSY LED's will on the rear panel is set for ac line voltage in now glow steadily. -
Page 28: Gpib Problems
EXC instrument. The default GPIB terminator for the key. DG535 is a carriage return and a linefeed with an EOI. The "GT" command may be used to change The DG535 will respond to commands only if it... -
Page 29: Calibration
Press the STORE Menu Key and adjust the risetime (less than 5ns) pulses such as an SRS DG535. You will also need several 50Ω coax value to set the reference frequency to cables and about ten 50Ω terminators. -
Page 30: Output Amplitude Calibration
CALIBRATION MENUS To access the calibration menus you must hold down the BSP key then press a menu key. Each menu key is used to access a different calibration factor per the following table: Menu Key Name Function TRIG Jitter Cal Minimize jitter from Ext Trig to A DELAY Delay T0... -
Page 31: Output Offset Calibration
Place a tee directly on this output, with one Hold down the BSP key and press the cable to the DG535 under test, and the other DELAY key to access the delay factor for cable to the oscilloscope. Both cables should be the corresponding delay output. -
Page 32: Circuit Description
"front" PCB. A block 120VAC primary tap on the transformer: use diagram for the DG535 is depicted in Figure 6. caution to avoid electric shock. MICROPROCESSOR SYSTEM OUTPUT PORTS ON THE TOP PCB... -
Page 33: Port Address Decoding
PORT ADDRESS DECODING I/O port decoding is done by U404 (74HC154) and U308 (74HC138). These IC's provide active low outputs which are used to strobe input and output ports, and to provide reset strobes. Name Description CTR6_CS LSI Counter/Timer Chip select INT_CLR Clears timer interrupt flag Spare to top PCB... -
Page 34: Digital To Analog Converter
threshold, reference oscillator frequency, oscillator. The window comparator, U507, is used to display contrast, and to calibrate assorted detect gross frequency errors as might be expected if current sources. Each of the 30 D/A sample and an external reference has insufficient amplitude or a hold circuits is refreshed for 1ms every 30ms. -
Page 35: Trigger Circuits
set according to the selection, which is made in differential pair Q102 and Q103; the outputs of this the TRIG Menu. If EXT trigger is selected, then differential pair is applied to the differential pair the output of the rate generator is set to either 0 formed by Q104 and Q105 which shifts the comparator's output to ECL levels. -
Page 36: Jitter Compensation
Each of the four delay channels behave like a 37 jitter pulse. The voltage on C106 is buffered by bit presettable synchronous binary ECL counter. Q109, a J310 FET, level shifted by D102, a 12V Each channel actually consists of a 2 bit ECL Zener, to drive the base of the emitter-follower, counter (a 10131 dual flip-flop), a 4 bit HC Q110. -
Page 37: Kickpulse
The way in which the LSI counters are used depends KICKPULSE on the number of cycles which must be counted. For very short delays, the output "A/N" may be preset OTA's (Operational Transconductance high by setting the output of the last LSI counter, Amplifiers) are used throughout the system to U206 pin 17, low. -
Page 38: Reset Cycle And Status Bits
portion of the delay is complete, A_CNT and its changed, so that the counters will be preset to their complement are asserted which causes the new values. This signal will reset the 1/2 of U311, differential pair formed by Q305A and Q306A presetting the 2/2 of U311 and so start the reset to switch the current source away from the OTA cycle. -
Page 39: Impedance Control
of Q303A through the emitter follower Q301A voltages on the two current sources), but are for improved pulse response at high currents. controlled together, i.e., the offset current sources are both controlled by the same menu item from the Q302A is used to sink currents from the output front panel. -
Page 40: Rear Panel Output Drivers
+10.000VDC reference is generated on the for positive output pulses. When Q1A is turned on, "bottom" PCB. the capacitors C4A and C5A, which were charged to -20 VDC through R9A, are connected to the capacitors C2A and C3A, which were precharged to REAR PANEL OUTPUT DRIVERS a voltage from - 19 to +20 VDC by the op amp 2/2 of U1. -
Page 42: Top Pcb
Connector, Male 0-00096-041 #4 SPLIT Washer, Split P 310 4-00268-446 2.2K Pot, Under Adjust 0-00162-007 TO-200 UP Heat Sinks 7-00079-701 DG535-30 Printed Circuit Board 0-00187-021 4-40X1/4PP Screw, Panhead Phillips Q 501 3-00140-325 2N2369A Transistor, TO-92 Package 0-00261-003 TO-18 Insulators R 103... - Page 43 REF# SRS PART # VALUE DESCRIPTION REF# SRS PART # VALUE DESCRIPTION C 301T 5-00056-512 Cap, Stacked Metal Film 50V 5% -40/+85c C 317B 5-00002-501 100P Capacitor, Ceramic Disc, 50V, 10%, SL C 302A 5-00064-513 .0047U Capacitor, Mylar/Poly, 50V, 5%, Rad C 317C 5-00002-501 100P...
- Page 44 N 504 4-00284-421 1.0KX4 Res. Network, SIP, 1/4W,2% (Isolated) N 109 4-00252-425 100X5 Resistor Network SIP 1/4W 2% (Common) 7-00077-701 DG535-28 Printed Circuit Board N 201A 4-00262-425 100X7 Resistor Network SIP 1/4W 2% (Common) Q 101 3-00139-325 J108 Transistor, TO-92 Package...
- Page 45 REF# SRS PART # VALUE DESCRIPTION REF# SRS PART # VALUE DESCRIPTION Q 306D 3-00022-325 2N3906 Transistor, TO-92 Package R 144 4-00059-401 Resistor, Carbon Film, 1/4W, 5% Q 306T 3-00022-325 2N3906 Transistor, TO-92 Package R 145 4-00030-401 Resistor, Carbon Film, 1/4W, 5% Q 307A 3-00027-325 2N5770...
- Page 46 REF# SRS PART # VALUE DESCRIPTION REF# SRS PART # VALUE DESCRIPTION R 310A 4-00032-401 100K Resistor, Carbon Film, 1/4W, 5% R 331C 4-00090-401 Resistor, Carbon Film, 1/4W, 5% R 310B 4-00032-401 100K Resistor, Carbon Film, 1/4W, 5% R 331D 4-00090-401 Resistor, Carbon Film, 1/4W, 5% R 310C...
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Page 47: Front Pcb
Cap, Monolythic Ceramic, 50V, 20%, Z5U 6-00017-630 FB43-301 Ferrite Beads C 4C 5-00023-529 Cap, Monolythic Ceramic, 50V, 20%, Z5U 9-00193-917 DG535 SERIAL Product Labels C 4D 5-00023-529 Cap, Monolythic Ceramic, 50V, 20%, Z5U C 4T 5-00023-529 Cap, Monolythic Ceramic, 50V, 20%, Z5U... -
Page 48: Miscellaneous And Chassis Assembly
Resistor, Metal Film, 1/8W, 1%, 50PPM 1-00052-171 40 COND Cable Assembly, Ribbon R 2C 4-00192-407 49.9K Resistor, Metal Film, 1/8W, 1%, 50PPM 7-00071-720 DG535-24 Fabricated Part R 2D 4-00192-407 49.9K Resistor, Metal Film, 1/8W, 1%, 50PPM 7-00072-720 DG535-25 Fabricated Part... -
Page 52: Fast Transition-Time Modules
Warranty: One year parts and labor on materials and workmanship. Note1: Amplitudes up to 3.7 Volts are obtainable with some increase in distortion. Amplitudes up to 15 Volts are available using DG535 option 02, rear panel ouputs and option 04C, bias tee. - Page 53 0.8 VDC for the fast risetime unit, and about +0.8 VDC for the fast fall time unit (.ie. 1/2 of In each of these cases, the offset of the DG535's the programmed offset). outputs may be adjusted for minimum pulse distortion.
- Page 54 (All rear panel outputs) IS EXCEEDED. THE BIAS TEE CONTAINS A SERIES RESISTOR SO THAT THE LOAD = 50 Ω VARiable output DG535 CANNOT DAMAGE THE SRD. AMPLITUDE -0.5 to -4.0 Output step = 5x Amplitude OFFSET +1 to +3 V...
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