Equipment information:

California Instruments 846VM Oscillator
Manufacturer:
California Instruments
Model: 846VM
Date: 1986
Category: Measurement instruments
Group: Oscillator
Description: Precision Programmable Oscillator
Information:
                                    California Instruments’ Model 847T Precision Programmable
Oscillator is designed to plug into and obtain power from
all of the Invertron· AC Power Sources. Frequency and
amplitude are remotely programmable through an IEEE-488
Interface connector or through a parallel interface
connector. Both connectors are mounted on the rear of the
associated power source and connected to the 847T through a
multi-conductor cable. Parallel programming by the parallel
interface connector of the 847T is always available when the
GPIB relinquishes control or allows the system to go the
local control mode. If the 847T GPIB interface is enabled,
the parallel interface input at the 846CM is disabled.
The output of the Model 847T provides three- phase variable
frequency and amplitude drive for the power source. Remote
inputs sense the voltage across the load connected to each
leg of the power source. In response to the level of these
inputs, the servo systems adjust the individual outputs of
the 847T to maintain the voltage across the power source
load at the programmed value. The 847T employs digital logic
techniques for frequency generation with a crystal
controlled oscillator serving as the reference for the
digital logic circuits. This technique provides long-term
frequency stability not obtainable with analog circuits.
The 847T is capable of operating from 45 Hz to 9999 Hz over
three ranges; 45 to 99.99 Hz
(selectable in 0.01 Hz steps), 45 to 999.9 Hz (selectable in
0.1 Hz steps) and 45 to 9999 Hz (selectable in 1 Hz steps).
The low end of the frequency detector is adjusted to shut
down the output of the 847T when the selected frequency is
below 45 Hz. The high end is factory adjusted to the upper
limit of the associated power source. Extending the
frequency range beyond 5 KHz requires programming with an
internal jumper. A "soft start" feature is incorporated
which gradually increases the output amplitude at initial
turn-on and when operation resumes after a shut down caused
by programming an out-of-limit frequency.
The output voltage range of the oscillator is proportional
to the amplitude programmed for the associated power source.
When the programmed output voltage for the power source is
135 or 270 volts, the oscillator output will be in the range
of 4 to 5 volts rms. The precise level will be dependent
upon the voltage level at the sense input. The sense input,
when connected directly across the load, increases the
oscillator output (and the power source output) to
compensate for any drop in the lines connecting the power
source to the load.
Relative to the reference phase, Phase A, the angle of the
Phase C output may be internally preset to any thirty degree
increment. Because of the digital techniques employed, the
electrical angle between phases remains constant
irrespective of frequency.

These manuals are available for the above equipment:

California Instruments -- 846VM -- Service and User Manual
File name: CaliforniaInstruments-7407-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 90
Size: 32.53 Mbytes (34111012 Bytes)
Language: english
Revision: E
Manual-ID/Number: 4847-960
Date: February 1986
Quality: Scanned document, reading partly badly, partly not readable.
Upload date:
MD5: f469436c9cf5253022f0d5d37951385d
ed2kID: 0cd8b1f39809a7b2610883dad90df084
Downloads: 30 since 20 December 2015
Information:
SECTION I—GENERAL DESCRIPTION
1.1
Introduction..............................................1-1
1.2 General Description...........................1-1
1.3 Accessory Equipment..................... . 1-1
1.4 Specifications...........................................1-2
SECTION II INSTALLATION AND OPERATION
2.1 General.
................................................ 2-1
2.2 Unpacking ................. 2-1
2.3 Power Requirements..................... 2-1
2.4 Fuse Requirements ........................... . 2-1
2.5 Power Source Interconnection ... 2-1
2.6 Acceptance Test Procedure............2-1
2.7 System Programming .....··.. 2-2
2.7.1 IEEE-488 Programming.............. . 2-2
2.7.1.1 Listen
Address....................................... 2-2
2.7.1.2 Listen Only (LON)...........................2-5
2.7.1.3 Request Service (RSV).....................2-5
2.7.1.4 Amplitude/Frequency
Programming«,.................................... 2-5
2.7.1.5 Default Values 2-8
2.8 Programming Range.................... 2-8
2.9 Remote Parallel Programming. . . 2-8
2.10 Model 846CM
Operating Controls.................. 2-8
SECTION III — THEORY OF OPERATION
3.1 General. ..·.··...................... 3-1
3.2 Functional Description.....................3-1
3.2.1 IEEE-488 Interface 3-1
3.2.2 Frequency Generator...........................3-2
3.2.3 Amplitude Programmer .....................3-2
3.2.4 Phase A Generator........................3-2
3.2.5 Phase C Generator..............................3-2
3.2.6 Phase B Generator............................3-2
3.2.7 Frequency Detector 3-2
3.2.8 Servo.............................................. 3-2
3.3 Detailed Circuit Description ... 3-3
3.3.1 IEEE-488 Interface...........................3-3
3.3.1.1 Command Programming.....................3-3
3.3.1.2 Command Decoding.............. 3-4
3.3.1.3 Power Shedding ....................................3-4
Para. Page
3.3.1.4 Command Reset........................ 3-4
3.3.2 Rate Multipliers .................................3-5
3.3.3 Amplitude Programmer.....................3-5
3.3.4 Phase A Generator..............................3-6
3.3.4.1 Address and
Direction Counters. 3-6
3.3.4.2 Quasi-Sinusoid Generation. .... 3-6
3.3.5 Multi-Phase Converter .....................3-7
3.3.5.1 Phase C Generator..............................3-7
3.3.5.2 Phase B Generator..............................3-8
3.3.6 Servo Amplifiers.............................. . 3-8
3.3.7 Frequency Detector ........................... 3-8
3.3.8 Fault System.........................................3-9
3.3.9 Power Supply................................. 3-10
3.4 Detailed Circuit
Description - 846CM....... 3-10
3.4.1 Local/Remote Transfer....... 3-10
3.4.2 Frequency/Amplitude Entry. ... 3-10
3.4.3 Frequency/Amplitude Display.. 3-11
3.4.4 Power-Up Clear .................................3-11
3.4.5 Power Supply.......................................3-11
SECTION IV ADJUSTMENT PROCEDURES
4.1 General.
.................................................... 4-1
4.2 Recommended Test Equipment... 4-1
4.3 Preliminary Steps .............................. 4-1
4.4 Sine Clock Adjustment ....... 4-1
4.5 GPIB Clock Adjustment..................4-1
4.6 Frequency Detector
Low Limit Adjustment..................4-1
4.7 Frequency Detector
High Limit Adjustment ...... 4-1
4.8 Open Servo Adjustment..................4-1
4.9 Common Mode Adjustment ..... 4-2
4.9.1 Phase A Common
Mode Adjustment............................4-2
4.9.2 Phase B Common
Mode Adjustment ..............................4-2
4.9.3 Phase C Common
Mode Adjustment................. 4-2
4.10 Decade Tracking Adjustment ... 4-2
4.11 10-Volt Adjustment . ................. 4-2
4.12 100-Volt/200-Volt Adjustment. . 4-3
SECTION V — MAINTENANCE
5.1. General.
.....................................................5-1
5.2 Required Test Equipment...............5-1
5.3 Test Procedure ....................................5-1
5.3.1 Power Supply Test. ...........................5-1
5.3.2 Clock Generator Test............... 5-1
5.3.3 Interface Clock Test................... 5-1
SECTION VI — DIAGRAMS
6.1 General............6-1
6.2 Reference Designators. . ................. 6-1
SECTION VII — REPLACEABLE PARTS
7.1
General.......................................................
7-1
7.2 Ordering Information. ........ 7-1
7.3 Computer Generated Parts Lists 7-1
CaliforniaInstruments-7407-Manual-Page-1-Picture
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