Philips PM 5785 Generator
Manufacturer:
Model:
PM 5785
Date:
1986
Category:
Group:
Description:
125 MHz Pulse Generator

Information

These Philips dual-output pulse generators satisfy the general-purpose high-speed requirements for both linear and digital applications. The PM 5785.85B units, with a performance of 125 MHz/1 ns (into 50 Ohms), feature extremely fast output waveform rise and fall transition times that can be adjusted in three steps. A feature of the PM 5786/86B units, with their performance of 125 MHz/2 ns (into 50 Ohms), is that both rise and fall transition times can be adjusted independently. Versatility is provided by the wide choice of external triggering and gating of the generators, various output modes of operation and for the "B" versions a pushbutton settable burst waveform facility. The layout of the front-panel, which facilitates easy operation, is further enhanced by LED indicators that highlight time-setting errors. These indicators help to avoid erroneous output waveforms due to incorrectly interrelated settings of the pulse delay, pulse duration and for the PM 5786 units, the rise and fall time controls. Clean, high-speed pulses The pulse generators feature high-speed, high- fidelity performance; ideal for all high-speed TTL and ECL circuit testing. The 20-80% transition times for ECL testing are selectable on the PM 5785 units down to 0.7 ns and variable on the PM 5786 units down to 1.4 ns. The 5 V bipolar outputs (into 50 Ohms), together with the high quality four range output attenuators, make these generators suitable for all kinds of linear applications. Clean pulses are guaranteed due to the excellent 50 Ohm back- matching impedances that absorb over 90% of all reflections coming from mis-matched (non 50 Ohm) loads. Selection of the outputs provides simultaneous positive- and negative-going waveforms often required for bipolar and linear applications, as well as complementary positive or negative waveforms for digital applications. The waveforms at the output sockets A and B are synchronous and are of the same amplitude, however the DC offset controls can be used to individually offset each output by ±2.5 V (into 50 Ohms). Output flexibility The choice of bipolar, positive or negative complementary waveforms offers an easy method of selecting the required output. This eliminates the need for "knob-twiddling" with inverting amplifiers and offset controls. Further, the COMPL (normal/complementary) switch allows the logic levels at the output sockets A and B to be interchanged without affecting their polarity. External input The external input facility allows external control signals to be used for triggering, gating, initiating an output waveform burst and "external duration". Such control signals can define the start (and with EXT DUR selected, the duration) of the output waveforms by the selection of +/- edge triggering and the adjustment of the -3 V...+3 V trigger level control. Triggering is indicated by a flashing LED. All functions available through the use of the external input can be carried out manually from the front panel. External triggering External triggering allows the generators to operate in synchronism with other clock input signals. All other parameters, such as pulse duration, pulse delay, etc, are set on the pulse generators themselves. The acceptable external trigger signal frequency range is DC...125 MHz or, in the double pulse mode, DC«...62.5 MHz. The external gate mode is a Generator output "ON/OFF” control. When the external gate signal is present, the output waveforms are available with the pre-set pulse parameters. Burst The "B" versions allow the generation of output waveform bursts containing pre-settable numbers of pulses: 0.....9999. These bursts can be initiated either manually, or by an external input signal. External duration The "external duration" mode allows the generators to function as input signal conditioners. Pulse period and duration are defined by external input signals whereas amplitude, DC-offset, leading and trailing edge transition times and the normal/complementary modes are defined by the pulse Generator settings. U "Symmetrical" pulse This mode of operation produces waveforms with a constant 0.5 duty factor and therefore facilitates the use of the units as clock pulse generators or as a quick method of determining the output waveform repetition rates. LED indicators highlight timing errors Setting-up errors occur because, for example, pulse period can be set to less than the sum of the other selected pulse timing parameters. Time-setting-error LEDs indicate which timing parameter settings are excessively long with regard to pulse period.

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User Manual
Manual type:
User Manual
Pages:
116
Size:
3.91 Mbytes (4095511 Bytes)
Language:
english, german, french
Revision:
Manual ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
12 June 2016
MD5:
2b0eeadee9cfa6f57f5603580630209f
Downloads:
574

Information

Section 1 - INTRODUCTION ... 1-2 Section 2 - INSTALLATION Caution ... 2-2 Safety precautions ... 2-2 If in doubt about safety ... 2-2 Grounding ... 2-2 Opening the cabinet ... 2-2 Mains voltage settings ... 2-2 The fuse ... 2-3 Orientation and cooling ... 2-3 Section 3 - DESCRIPTION OF CONTROLS ... 3-2 Timing parameters ... 3-3 External input ... 3-3 Input mode selectors ... 3-4 Clock output ... 3-4 Pulse form selectors ... 3-5 Outputs and their controls ... 3-5 BASIC CONTROL SETTINGS ... 3-6 WHAT WENT WRONG? ... 3-7 Section 4 - DESCRIPTION Of FUNCTIONS ... 4-2 Block diagram ... 4-7 Pulse definitions ... 4-7 Section 5 - PERFORMANCE CHECK INTRODUCTION ... 5-2 Recommended test equipment ... 5-2 SPECIFICATION TESTS ... 5-2 Section 6 - SPECIFICATIONS ... 6-2 Accessories ... 6-5

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