Datapulse Generator - bought one - Page 1
Forum section: electronics / testgear

author: metrologist
author_rank: Super Contributor
timestamp: March 13, 2017, 07:43:49 am
content: What do you use these for?Model 101 pulse generator. 10 MHz PRF and I see 4.2 ns rise time.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: March 13, 2017, 08:18:12 am
content: I have a DP101 too!You use it for generating pulses.No, seriously. It is like a function generator, but only generates "square wave" (rectangular) pulses with a wide range of timing, duty cycle, and triggering options.The front-panel controls are pretty self-explanatory.I haven't had to do any repairs on mine, and it gets very close to its specification rise time of 5 ns when connected properly (50 ohms output impedance).Here's a little video showing the use of an Interstate F43 FG to gate the pulse signal from the DP101 in an electromagnetism "propulsion" experiment.

author: metrologist
author_rank: Super Contributor
timestamp: March 13, 2017, 03:38:17 pm
content: I'll have to find some pulse applications.How do you set the single pulse button? Should it fire when gate mode is set to sync or async?

author: metrologist
author_rank: Super Contributor
timestamp: March 13, 2017, 10:14:31 pm
content: I found a manual for the 100ahttp://bee.mif.pg.gda.pl/ciasteczkowypotwor/Systron%20Donner/Systron-Donner_100A_Pulse_Generator.pdfThe single pulse button still confuses me. The instructions say something about a "single pulse mode" that is somehow different than the SGL/DBL pulse setting.QuoteIn the below procedure, it would seem the pulse is already in free run...?Edit: I just noticed the image in the manual has single pulse in the PRF vernier. I think mine does not have that or it's rubbed off. I recall it as a CAL setting.Quote

author: alsetalokin4017
author_rank: Super Contributor
timestamp: March 13, 2017, 11:46:42 pm
content: Yes, on the leftmost knob (pulse repetition rate) the "Single Pulse" setting is for the Outer Knob at the lower right position. The "Cal" setting is for the Vernier (smaller) knob adjustment.Yes, when the Outer knob is set to the "Single Pulse" setting, pushing the button should produce a single pulse (or double pulse) of the width selected with the pulse width control.Your unit may have the Single Pulse label rubbed off. The knob can only be rotated to the Single Pulse position by turning it counterclockwise all the way, you can't get to that position by turning clockwise. The little white selection indicator on the outer knob is hard to see.

author: G0HZU
author_rank: Super Contributor
timestamp: March 14, 2017, 12:40:33 am
content: I've got one of these Datapulse 101 generators as wellI bought mine for just £5 back in the 1990s at a radio rally and I also bought an HP8002A pulse gen the same day for the same price.The little Datapulse 101 has been really useful over the years for so many things. Too many to mention.If you google for images of Jim Williams' workbench you can often spot a Datapulse 101 on his bench somewhere.

author: metrologist
author_rank: Super Contributor
timestamp: March 14, 2017, 03:57:22 am
content: alright thanks. Found it all and works great.

author: TimFox
author_rank: Super Contributor
timestamp: March 14, 2017, 04:19:21 pm
content: Quote from: metrologist on March 13, 2017, 10:14:31 pmSGL/DBL pulse setting allows you to generate two pulses for each cycle, with the delay pot determining the time between two identical pulses and the period pot determining the time between the first of the pair and the first of the next pair of pulses.

author: metrologist
author_rank: Super Contributor
timestamp: March 14, 2017, 05:31:13 pm
content: I was just not realizing the Single Mode setting on the PRF knob, it is all the way around to the left, past about 4 detents for setting the line, external, and gated inputs. I am going to fix the white mark on the knob so it can be seen, and clean off the rest of the schmoo on the front panel so I can read the silk screening.I may crack it open and calibrate the frequency. It does not quite get to 10 MHz.