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RC-44 RAMP GENERATOR INSTRUCTION MANUAL RC-44 RAMP GENERATOR
INSTRUCTION MANUAL
Instruction Manual (Rev. C)
51504-M-00
Copyright
©
Burleigh Instruments, Inc. 1993
All Rights Reserved
Burleigh Instruments, Inc.
Burleigh Park
P.O. Box E
Fishers, NY 14453-0755
Tel. (716) 924-9355
Fax. (716) 924-9072 TABLE OF CONTENTS
1.
INCOMING INSPECTION..............................................................1-1
1.1.
Visual ...................................................................................1-1
1.2.
Electrical ..............................................................................1-1
1.3.
Quality Control .....................................................................1-1
2.
DESCRIPTION ...............................................................................2-1
2.1.
Ramp Section ........................................................................2-2
2.2.
Bias Section ..........................................................................2-3
2.3.
Control Signals......................................................................2-3
2.4.
External Programming..........................................................2-3
2.5.
Digital Voltmeter Section (DVM) ............................................2-4
2.6.
Programmable Ramp.............................................................2-4
3.
OPERATION...................................................................................3-1
3.1.
Initial Check .........................................................................3-1
3.2.
Operational Check.................................................................3-2
3.3.
Trim Controls .......................................................................3-2
3.4.
Programmable Ramp.............................................................3-4
4.
PERFORMANCE............................................................................4-1
5.
SERVICING ....................................................................................5-1
5.1.
Low Voltage Ramp Generator.................................................5-1
5.2.
RC-44 Digital Voltmeter Section .............................................5-2
5.3.
Troubleshooting.....................................................................5-2
5.4.
Converting from 110 VAC to 220 VAC ....................................5-3
6.
SPECIFICATIONS ..........................................................................6-1
7.
WARRANTY....................................................................................7-1 RC-44 Ramp Generator Instruction Manual
1. Incoming Inspection
Burleigh Instruments, Inc.
page 1 - 1
Burleigh Park, Fishers, NY 14453
1.
INCOMING INSPECTION
1.1.
Visual
Burleigh Ramp Generators have been packaged in a special carton designed to
give maximum protection during shipment. If the outside of the shipping carton
is damaged, notify your shipping department immediately. The shipping
department may wish to notify the carrier at this point.
If the shipping carton is undamaged externally, the instrument should be
removed from the carton. If any damage is evident visually or if any rattling
can be heard when the unit is shaken lightly, notify Burleigh Instruments and
your shipping department. It is advisable to save the special carton for future
storage or transportation.
1.2.
Electrical
Assuming that the instrument is in good condition visually, a preliminary
check of its electrical operation should be made. This can be accomplished as
follows: plug the instrument into the appropriate outlet as indicated on the rear
panel, connect the OUTPUT
÷
100 connector on the rear panel to an
oscilloscope, set the RAMP DURATION to 100 ms, set the RAMP AMPLITUDE
to midposition and set the RAMP BIAS knob midway (the amplitude and bias
controls are 3-3/4 turn slip clutch potentiometers). An unclipped, 5 V, repetitive
ramp should be observed. Should the RC-44 fail this initial check, Burleigh
Instruments should be notified.
1.3.
Quality Control
All Ramp Generators undergo several stages of inspection, test, and calibration
before shipment, including a burn-in at elevated temperatures. The instrument
has also undergone an exhaustive final test and calibration process prior to
shipment. Should a problem arise during the warranty period, Burleigh's policy
is to repair any instrument within one week of receipt at the factory. During
this time, the instrument will be burned-in for an additional period of 3 days,
before rechecking and returning to the customer. RC-44 Ramp Generator Instruction Manual
2. Description
Burleigh Instruments, Inc.
page 2 - 3
Burleigh Park, Fishers, NY 14453
2.2.
Bias Section
Three controls labeled BIAS 1, BIAS 2, and BIAS 3 adjust the DC voltage to
each of three independent PZT elements. When connected to a Fabry-Perot
stack assembly, these signals are applied to the positive side of the PZT bias
stack, the negative side is returned to ground. (NOTE: PZT ramp and PZT bias
stacks are electrically separate). With other piezoelectric devices that use single
PZT elements, the bias voltages may be applied to the negative side of each PZT
element with the ramp voltage on the positive side.
2.3.
Control Signals
The connections for these signals are present on the rear panel to simplify
operation.
1) Output
÷
100 BNC connector
The ramp output, attenuated by a factor of 100, allows display of the ramp
waveform on any oscilloscope, chart recorder, or other display system
without the concern of handling a 1000 V signal and can be used to slave
other units.
2) Trigger BNC connector
Triggering a scope or other instrument in a display system is simplified by
use of a square wave pulse of +12 V which occurs for the duration of the
ramp retrace.
3) Blanking BNC connector
A blanking signal of -12 V is turned on for the duration of the retrace time
so that the display system can be blanked off during the flyback of the PZT
element.
2.4.
External Programming
Two rear panel external inputs can be used to program the RC-44 in specialized
applications. With the EXTERNAL INPUT connector, the high voltage DC
amplifier can be driven by an error signal in a feedback loop or by a waveform
other than a ramp. To do this, set the ramp duration to off. (If the ramp
duration is not turned off, the external input will be summed with the ramp.)
The gain of the amplifier is variable from 0 to +100 using the front panel
amplitude control.
A second, low gain input to the amplifier is labeled DRIFT CONTROL. A low
level DC signal derived from a temperature recording device or from a
stabilization system can be fed into the DRIFT CONTROL input to compensate
for axial drift in the cavity being controlled. The proper error signal level is
determined experimentally. RC-44 Ramp Generator Instruction Manual
2. Description
Burleigh Instruments, Inc.
page 2 - 4
Burleigh Park, Fishers, NY 14453
2.5.
Digital Voltmeter Section (DVM)
The RC-44 contains a 3 1/2 digit voltmeter for measuring the voltages present
on the three bias controls as well as the ramp voltage. Selection of the voltage
measurement of interest is accomplished by pressing the display button, to light
the LED indicator over the desired control knob.
2.6.
Programmable Ramp
This is controlled by an on/off switch and adjustment potentiometer on the rear
panel. The amount of correction to the ramp drive is adjusted here. RC-44 Ramp Generator Instruction Manual
3. Operation
Burleigh Instruments, Inc.
page 3 - 1
Burleigh Park, Fishers, NY 14453
3.
OPERATION
CAUTION: The RC-44 Ramp Generator is a low impedance source and is capable
of generating voltage levels in excess of 1000 V. Do not attempt to
make any connections to the Ramp Generator when the unit is turned
on. After turning the RC-44 off, it is good practice to wait for a short
time until any residual voltage on the capacitive filtering circuits
have been discharged.
3.1.
Initial Check
Check to see that the Ramp Generator is operating properly before connecting it
to the piezoelectric device. To do this, connect the OUTPUT
÷
100 signal to an
oscilloscope and connect the TRIGGER output to the external trigger on the
scope. Set the RAMP AMPLITUDE control to about mid-position, or about two
turns from fully counter clockwise. Set the RAMP BIAS