Gentec-EO TUNER - Manual (Page 10)

TUNER User’s Manual Revision 4.2 9
Gentec Electro – Optics, Inc. All rights reserved
7 - Digital low / W/dBm Control Keys
Displays the maximum recorded values. To return to measurement display mode, press the key again.
The dBm function is available by pressing more than 2 seconds on the Digital-Low control key. The Tuner
will convert the displayed number in dBm (dB referenced to 1mW) and will display “dBm” message unit
and then no units. To get back to the previous display in Watt, press again more than 2 seconds on the
Zero control key. The ranges are also displayed in dBm.
8 - Display
Two parts digital/analog display LCD screen. Refer to section 1.5 for a detailed description.
1.4 Connectors Description
Fig. 1-2 TUNER Connectors
1- EXTERNAL POWER SUPPLY INPUT JACK.
Input voltage required: 9 VDC/100 mA. The external power supply does not charge the
batteries; it allows the use of the monitor without batteries, with dead batteries or simply
to avoid discharging the batteries inside the monitor.
CAUTION
Permanent damage to the optical meter may occur if an
external power supply other than the Gentec-EO P/N
200960A is used. Please call Gentec-EO or your local
distributor if extra power supplies are needed.
2- 0 to 1 VOLT ANALOG OUTPUT:
For monitoring laser average power by using external equipment such as a chart
recorder, a computer with an analog interface, a voltmeter, etc.
The output signal is the amplified power detector response, in fast or slow mode.
The 1 V value corresponds to the full scale reading of the selected range. That provides
the best signal-to-noise ratio. The measured power is then related to the output voltage
and to the selected range according to the following equations:
selected Range of Max
 
output
V Power
1 3 2