Gentec-EO MAESTRO - Manual (Page 12)

MAESTRO User’s Manual Revision 8.1 11
either the internal fuse will blow or the monitor may be damaged, depending on the
voltage level and the waveform.
4- USB INTERFACE CONNECTOR:
This interface allows remote control and data transfers between the MAESTRO and a
computer that has a USB communication port.
5- SERIAL INTERFACE CONNECTOR (RS-232, Analog out, Ext trigger):
RS-232:
The RS-232 interface allows remote control and data transfers between the
MAESTRO and a computer, a terminal, or any device that has a serial
communication port. To use the RS-232 port, you must have a special cable
(part number 201860).
Analog out:
It allows monitoring the laser average power or energy by using external
equipment such as a chart recorder, a computer with an analog interface, a
voltmeter, etc. To use the analog output port, you must have a special cable
(part number 201958).
For power measurements: the output signal represents the amplified and
anticipated power detector response.
For energy measurements: the output signal is a DC voltage representing the
pulse energy value.
The 1 V value corresponds to the full scale reading of the selected range. It
provides the best signal-to-noise ratio. The measured power or energy is then
related to the output voltage and to the selected range according to the following
equations:
selected Range of Max
 
output
V Power
selected Range of Max
 
output
V Energy
For example:
1.00 V corresponds to 10 Watt on the 10 W range
0.25 V corresponds to 2.5 Watt on the 10 W range
0.10 V corresponds to 30 mW on the 300 mW range
Specifications:
Maximum output voltage: 1 V
Output impedance: 2 k

External trigger:
To use the external trigger, you must use a special cable (part number 201956).
The External trigger is TTL compatible. The maximum voltage is 25 volts, the
trigger needs a positive voltage, the minimum width is 1

s. The monitor detects
the trigger on the rising side of the external trigger signal. To measure accurately,
the trigger must be just before the laser pulse, or just after. For example:
A QE12SP-S-MT has a 20

s rise time
The External trigger must be 4

s before or 19

s after the laser pulse.