CGS Instruments QPS400-3 User manual

INSTRUMENTS
http://www.cgc-instruments.de/
Quadrupole Power Supply Unit QPS400-3
Instruction Manual
Document version 1.00, created on 12.07.2004

QPS400-3 Technical Data
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Quadrupole Power Supply Unit 3×400 V
QPS400-3
Version 1.00

QPS400-3 Technical Data
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Technical Data
Characteristics
•Precise high-voltage amplifier for electrodynamical quadrupole traps
for micro- and nanoparticles
•DC accuracy
•Extremely low temperature coefficient of amplification
•High bandwidth
•Low noise
•Temporally short-circuit proof
•19" case
Input
•Input voltage: ±10 V max.
•Input impedance: 47 kΩ
•Signal inputs: 50 ΩBNC plug sockets
Output
•Amplification:
AC input: 40
DC inputs: 4
•Function:
VTop = –40VAC – 4VDC
VMid = +40VAC – 4VM
VBot = –40VAC + 4VDC
•Output voltage: ±400 V min. (> 800 Vpp)
•Output current: ±50 mA max.
•Output power: 10 W / channel max.
•Bandwidth:
AC input (±10%): 3.5 Hz ... > 1 MHz
DC inputs (-3dB): DC ... 100 kHz
•Power bandwidth: > 100 kHz (200 kHz typ.)
•Output offset voltage: < 100 µV
•Drift of the output voltage: < 1 µV/K
•Noise (DC-10 MHz): 3 mVeff (typ.)
•Precision of the amplification at low frequencies:
< 200 ppm (100 ppm typ.)

QPS400-3 Technical Data
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•Temperature coefficient of the amplification at low frequencies:
< 10 ppm/K (5 ppm/K typ.)
•Signal outputs: 93 ΩBNC plug sockets
•Output short circuit duration: 1 s max.
Monitor Output
•Attenuation: 1:40 of the output voltage
•Output voltage: ±12 V min.
•Output current: ±20 mA max.
•Output offset voltage: < 100 µV
•Drift of the output voltage: < 25 µV/K (5 µV/K typ.)
•Precision of the attenuation at low frequencies:
< 0.2% (0.1% typ.)
•Temperature coefficient of the attenuation at low frequencies:
< 50 ppm/K (25 ppm/K typ.)
•Bandwidth (±10%): DC ... > 1 MHz
•Signal outputs: 50 ΩBNC plug sockets
•Output short circuit duration: indefinite
Power Supply
•Rated voltage: 230 V or 115 V ±10% (voltage selector switch)
•Rated frequency: 50/60 Hz
•Fuse: T 0.63 A at 230 V, T 1.25 A at 115 V
•Power consumption: about 70 VA without load, 130 VA max.
•Main connection: IEC inlet
General
•Dimensions:
2 HU 19" plug-in box for mounting in a 19" cabinet
(height: 88 mm, width: 483 mm)
depth with heat sink without handles: 265 mm
•Weight: 6.8 kg

QPS400-3 Technical Data
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Shipment Content
•Quadrupole power supply unit QPS400-3 in 19" case
•Line cord (universal IEC mains lead, length 1.8 m)
•Output cables
(3 pcs. 93 Ωcoaxial cable with 93 ΩBNC jacks,
length 1.2 m each)
•Ground wire
(flexible wire 1 mm2with 4 mm cable eyes, length 2 m)
•Material for mounting in a 19" cabinet
(4 pcs. M6 screws with washers and cage nuts)
•Instruction manual

QPS400-3 Terminals
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Terminals
The QPS400-3 device is equipped with 3×3 input and output BNC plug
sockets and a ground socket (4 mm banana socket) on the front panel and
an IEC inlet for the mains connection on the rear panel. Also on the rear
panel, a voltage selector switch allows changing the rated mains voltage
between 230 V and 115 V. The device fuse is integrated in the IEC inlet.
When changing the rated mains voltage, the fuse must be exchanged for
one with a value corresponding to the new mains voltage (see Technical
Data: Power Supply).
Power Output
Bottom Middle Top
Monitor
Bottom Middle Top
VAC VDC VM
Input
Quadrupole Power Supply 3x400Vp
QPS 400-3
Fig. 1. The terminals and control elements on the front panel of the quadrupole power sup-
ply unit QPS400-3.
Power: mains switch with signal lamp
Input: signal inputs (VAC, VDC, VM)
Monitor: monitor outputs (Bottom, Middle, Top)
Output: amplifier outputs (Bottom, Middle, Top)
: device ground

QPS400-3 Getting Started
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Getting Started
Before turning on the device, the rated value of the mains voltage must be
set and a corresponding fuse must be installed.
The device must be properly cooled. The heat sink at the rear panel must
not be covered and the fan must be able to supply sufficiently cool air.
The temperature of the cases of the amplifier ICs must never exceed
80°C.

QPS400-3 Adjustment Elements
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Adjustment Elements
This device is shipped to you ready to use. Adjustments should not be
necessary. They should be performed only for maintenance purposes or to
optimize the frequency response in the case of a special load.
Attention: Adjustments can be made by trained personnel only:
•A wrong setting can damage the device.
•Manipulation of the device when the case is open is perilous. Even sev-
eral minutes after turning off the device the capacitors of the power
supply unit can be charged to high voltages.
!
Fig. 2. The inner assembly of the quadrupole power supply unit QPS400-3.
High-voltage power-supply units (Fig. 3.): left – positive, right – negative supply voltage,
Amplifier (Fig. 4): center.

QPS400-3 Adjustment Elements
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Fig. 3. Adjustment elements of the high-voltage power-supply units.
POT1: adjusting the value of the supply voltage

QPS400-3 Adjustment Elements
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Fig. 4. Adjustment elements of the amplifier.
CT1: frequency compensation of the input stage (balancing the channels)
CT2-4: frequency compensation of the monitor outputs
POT1-3: compensation of the offset voltage of the monitor outputs
CT5-7, POT4-6: frequency compensation of the main amplifier