New Focus LB1005 Bedienungsanleitung
Item No. P2102297 Rev. A
Operating Manual
LB1005 High-Speed Servo Controller
Bookham
2584 Junction Ave.
San Jose, CA 95134
(408) 919-1500
LB1005 Operating Manual Table of Contents
Bookham [New Focus logo] Revision 1 i
Contents
Contents................................................................................................................ i
Chapter 1 : Introduction...................................................................................... 1
Safety Considerations...................................................................................................................1
Table of Symbols ..........................................................................................................................1
Parts List.......................................................................................................................................2
Electrical Fuse & Voltage Selection..............................................................................................2
Front Panel Connections & Controls.............................................................................................3
Rear Panel Connections & Controls .............................................................................................5
Chapter 2 : Getting Started................................................................................ 7
Typical Setup ................................................................................................................................7
Typical Operation........................................................................................................................10
Chapter 3 : Detailed Operation........................................................................ 13
Signal Architecture......................................................................................................................13
Filter Transfer Functions.............................................................................................................14
Setting Output Voltage Limits......................................................................................................15
Using the Integrator Hold............................................................................................................16
Applying Modulation Inputs.........................................................................................................16
Appendix A : Specifications............................................................................ 17
Appendix B : Service & Maintenance............................................................. 19
Appendix C : Warranty..................................................................................... 21
LB1005 Operating Manual Introduction
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Chapter 1: Introduction
This manual contains information for operating the New Focus LB1005 High-
Speed Servo Controller. The LB1005 is a high-performance, standalone
instrument that provides the appropriate analog signal conditioning for
achieving stable feedback control. The LB1005 is particularly suited for high-
bandwidth filtering required to stabilize the intensity and frequency of many
laser systems. This chapter addresses pertinent safety issues and correct usage of
this instrument, as well as defines all front and rear panel connections. Please
carefully read this chapter before using the LB1005. Chapter 2 helps users
immediately get started using the LB1005 in their application, while Chapter 3
has more complete details of the operation of the LB1005.
Safety Considerations
The LB1005 is a versatile instrument that can be used in a variety of feedback
control applications. However, the LB1005 is not intended for fail-safe
operation in hazardous environments or life-threatening situations. The user
assumes full responsibility for correct and safe usage of the LB1005 in accordance
with any applicable laws, codes, regulations, and standards pertaining to their
specific application. Bookham is not liable for any consequential damage due to
misapplication or failure of the LB1005.
Table of Symbols
Alternating current
Caution – risk of electric shock
Caution – refer to manuals
Fuse
On (AC voltage supply)
Off (AC voltage supply)
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Parts List
The LB1005 is shipped in a package designed to provide excellent protection. The
shipping box should be saved for future transportation or storage needs.
Carefully remove and inspect the following items that are contained in the
shipping box:
•LB1005 Servo Controller
•LB1005 Operating Manual
•AC Power Cord
Electrical Fuse & Voltage Selection
The LB1005 is pre-configured at the factory to work with the AC mains voltages
for your region. Before supplying electrical power to the LB1005, confirm that
the power entry module located on the rear panel is installed with the proper
fuses and set to the correct wallplug AC voltage. Use Table 1 to determine the
appropriate fuse and voltage settings.
Table 1: Fuse & Voltage Settings
AC Mains*
V~ Tolerance
V~ Fuse Rating**
Module Voltage
Wheel Setting
100 90—110 100Vac
120 108—132 250 V
0.50 A T 120Vac
220 198—242 220Vac
230-240 207—264 250 V
0.25 A T 240Vac
* 50/60 Hz only. **Module only accepts dual metric 5 x 20 mm fuses.
To operate at another AC mains voltage, follow the procedure below:
•With a small screwdriver, pry open fuse cover of the power entry module on
rear panel. The AC power cord must be removed from module socket before
opening fuse cover.
•Carefully pull out the voltage selection wheel from the module. Re-insert so
that correct AC voltage setting is facing outwards.
•Pull out the two fuse holders located below voltage selection wheel. Insert
correct fuses into each fuse holder and re-insert back into module. Install fuse
holders so that arrows on fuse cover and fuse holder align.
•Snap fuse cover back into place. Verify that the correct AC mains voltage can
be read through fuse panel before attaching the AC power cord.
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Front Panel Connections & Controls
Figure 1: LB1005 Front Panel
1. A, -B:The error signal is generated from the voltage difference of these BNC
inputs. Both voltage channels have 1-MΩinput impedance and an input
voltage range of ±10 V. For single-ended operation, these BNC connectors
auto-terminate upon disconnection of cables.
Warning: For proper operation, cables attached to either of these inputs must be
driven with a voltage source or terminate into a low impedance. Make sure that any
attached BNC cable connectors are fully inserted and fastened to the panel connector.
2. Input Offset:This 10-turn locking knob controls a stable offset voltage that
can be added or subtracted from the voltage difference of the Aand –B
inputs. This offset can be adjusted over a range of either ±1 V or ±10 V,
selected by the rear panel Input Offset Range switch. The Input Offset can
also be disabled. The offset voltage corresponds linearly to the dial readout:
VOffset =(0.2n−1) ×VMaxRange , where nis the number of turns read from the dial
indicator. For example, a dial value of n= 5.00 indicates a (near) zero offset
voltage.
3. Error Monitor:This BNC output connector is a voltage monitor for the error
signal generated by the input difference amplifier. The DC-coupled error
monitor has unity gain with a nominal output voltage range of ±10 V and a
bandwidth of 10 MHz.
4. Sweep In:This BNC input allows a low frequency periodic sweep signal to
be added to the output of the LB1005. The input impedance is 1 MΩand the
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input voltage range is ±10 V. See Sweep Center and Sweep Span controls
discussed below for more details.
5. Output:This BNC output is the control signal from the proportional-integral
(P-I) filter, summed with the sweep and modulation signals. This output has
an impedance of 50 Ωand a drive current of ±20 mA.
6. Sweep Center (Output Offset):This 10-turn knob adjusts the offset voltage
of the signal from Output. The offset voltage can be adjusted from the
negative voltage limit (fully counter clockwise) to the positive voltage limit
(fully clockwise). See the section Setting Output Voltage Limits in Chapter 3 for
more details on setting the output voltage limits.
7. Sweep Span:This 1-turn knob controls the attenuation of the Sweep In
signal. Attenuation is near linear from zero (Off, fully counter-clockwise) to
unity gain (fully clockwise). This knob is used to adjust the amplitude of the
sweep input signal.
8. P-I Corner:This 12-position switch sets the proportional-integral (P-I) corner
frequency of the filter. See the section Filter Transfer Functions in Chapter 3
for details.
9. LF Gain Limit:This 9-position switch controls the low frequency gain limit
(LFGL) of the loop filter. This knob is only active when the Acquire switch is
in LFGL mode. See the section Filter Transfer Functions in Chapter 3 for
details.
10. Gain:This 10-turn knob continuously controls the overall feedback gain of
the loop filter from -40 dB (fully counter clockwise) to +40 dB (fully
clockwise). Gains from -30 dB to +30 dB have a dial indicator reading that is
near linear from indices n = 2 to 8 (~10 dB/turn).
11. Acquire switch: This 3-position switch is used to acquire lock. Table 2 shows
the function for each switch position.
Table 2: Functions for Acquire Switch
Position Function
Lock Off Integrator is reset. No control signal is summed into output signal.
LFGL P-I filter is enabled with a low frequency gain limit determined by LF Gain
Limit switch. See the section Filter Transfer Functions in Chapter 3.
Lock On P-I filter is enabled with full integrator. Low frequency gain limit is disabled.
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12. LED lock indicator:This LED light indicates the operating status of the
LB1005. Table 3 shows the correspondence of the LED color to the operating
conditions of the LB1005.
Table 3: LED Lock Indicator
LED Color Condition
Unlighted OFF: LB1005 is either disconnected from the AC mains supply, or
the rear panel power switch is in Off position (0).
Green LOCKED:
Acquire switch is placed in either LFGL or Lock On position,
AND
Error signal voltage is within ±0.33 V.
AND
Output signal voltage is NOT within 10% (scaled to full voltage range)
of either the positive or negative output voltage limits.
Red UNLOCKED: All remaining operating conditions.
Rear Panel Connections & Controls
12
345
6
78 5
6
Figure 2: LB1005 Rear Panel
1. Power switch:This switch is pushed up to |position to turn on AC mains
power to LB1005.
2. Power entry module:The AC power cord must be connected between this
instrument receptacle and a properly grounded mains receptacle. The
LB1005 can be configured to operate with the following AC mains voltages:
100, 120, 220, and 230-240 VAC. Please carefully read the preceding section
Electrical Fuse & Voltage Selection for instructions on installing the proper fuses
and setting the correct AC supply voltage.
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3. Input Offset Range: This 3-position switch determines the voltage range for
the Input Offset front panel knob. For more information, please see the above
section Front Panel Connections & Controls). Selecting the Off position disables
the Input Offset control so that no voltage offset is added.
4. Output Voltage Limits:These 15-turn trimpots determine the output
voltages that clamp the positive and negative voltage rails of the Output. See
section Setting Output Voltage Limits in Chapter 3 for more details.
5. Mod 1 Input, Mod 2 Input:Input signals to these BNC connectors are
summed into the Output signal. Each modulation input has an input voltage
range of ±10V, 1-MΩinput impedance, and 1-MHz bandwidth. See the
section Applying Modulation Inputs in Chapter 3 for more details.
6. Attn 1, Attn 2:These 15-turn trimpots attenuate the corresponding input
modulation signals from off (fully counter-clockwise) to unity gain (fully
clockwise). See the section Applying Modulation Inputs in Chapter 3 for more
details.
7. Aux Output:This BNC connector is the control voltage output directly from
the P-I filter section, bypassing the summing amplifier. The Output Voltage
Limits do not apply to this output. The output range is ±10 V with 50-Ω
output impedance.
8. Int Hold Input:This TTL logic input switches off the error signal input to the
P-I filter and holds the integrator output voltage at its current value. Table 4
shows logic levels for this input. Since this input is pulled low, the BNC can
be left unconnected for normal operation.
Table 4: Logic Levels for Int Hold Input
TTL Logic Level Function
Low (<0.8 V) Normal P-I filter operation.
High (>2.4 V) No error input to filter. Integrator holds its current voltage value.
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