410 Precision Lamp Source0 pages

OL 410
Precision Lamp Sources

The OL 410 is a microprocessor-controlled, precision DC lamp
source specifically designed to accurately operate tungsten
filament lamp standards and calibration sources. The power
output range is 150 watts for the OL 410-150 and 200 watts for
the OL 410-200. Both units feature:
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Output current accuracy of ±0.02% or better
Controlled ramp up / ramp down of the lamp current
Simultaneous digital readout of lamp current, voltage,
and power
Ten (10) element lamp library with individual lamp
hours monitors
Large two-line display with ON/OFF control
Adjustable tilt handle
Full-speed USB 2.0 interface

Tungsten lamp standards must be operated at their specified
calibration current in order to realize the accuracy of the
standard. A small error in setting the lamp current can induce
a sizeable, wavelength dependent error in the spectral output
of the lamp. The OL 410 enables the lamp current to be set to
an accuracy of better than ±0.02%, a factor of about 12½
better than most other commercial power supplies, which are
typically 0.25%. The advantage of the OL 410's increased
accuracy is illustrated in the table.
In order to eliminate electrical shocking of the lamp due to high
initial current surges, a ramp function is used to control the turnon current rise. Once the instrument is turned on, the current
automatically increases at a slow, safe rate until the set current
is reached. A fail-safe, shut down circuit protects the lamp
standard against any equipment malfunctions.

OL 410 improvements over the OL 65A Programmable
Current Sources include:
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User-configurable line voltage
Pre-regulator eliminates the range switch, thus
allowing a wider range of lamps (not available on the
OL 410-150)
Three point calibration for better accuracy at low
currents
USB interface instead of RS-232/ GPIB
New .NET software development kit and application
Enhances reliability due to improved heat sink and
single output transistor
More stable due to improved drive electronics

SPECTRAL IRRADIANCE UNCERTAINTY
Due To
ERROR IN SETTING LAMP CURRENT
Wavelength
(nm)

OL Series 410
± 0.02%

Other Supplies
± 0.25%

250

0.24%

3.0%

300

0.18%

2.3%

550

0.08%

1.0%

1000

0.04%

0.5%

2000

0.02%

0.3%

*Tungsten Lamp @ ~3000K

The current sources will maintain their accuracies while
experiencing ±10% fluctuations in line voltage and ±10%
variance on the load voltage. These features effectively
compensate for transients in the power line and variations in
resistance from one lamp to another.
Contact: orlandosales@goochandhousego.com

www.GHinstruments.com

As part of our policy of continuous product improvement, we reserve the right to change specifications at any time
Bulletin 143 / Rev 5-10
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