High Power 2 Channel RF Driver:For 2 Acousto-optic Q-Switches MQH0XX-YYDM-ZZZ-2S
Former Model Number: 390XX-YYDMZZZ-2CH-A
Description:
The MQH0XX-YYDM-ZZZ-2S module is a High Power RF Driver with two RF outputs derived from one oscillator and is designed to drive two Q-Switches. There are two digital modulation control inputs: Fixed and Variable. These controls allow the customer to issue a pulse command of a "Fixed" pulse width, the duration determined by the Driver's pulse width control, settable by the customer, or issue a "Variable" pulse command, the duration determined by the input signal’s pulse width. The output power of both channels are controlled by the analog input, where the mode of operation is defined by ZZZ = A05 normal analog mode, or R05 analog switched to full RF mode or a triggered RF Ramp Down mode where ZZZ = FPS first pulse suppression mode or PPK pre-pulse kill mode. The choices of Frequency (XX), Output Power (YY), and Power Control (ZZZ) option are "Factory Set" when ordered. The driver requires forced air cooling.
The product delivered will be manufactured to be compliant with EU Directive 2011/65/EU for Reduction of Hazardous Substance. The product will be manufactured to other standards upon customer request.
Key Features:
- 24, 27.12, 40.68, 68, or 80 MHz RF Frequency (XX)
- 0.01% Quartz Stabilized
- 2 Outputs with up to 50 watts RF power output (YY) per channel (2S)
- Two TTL Digital Modulation Inputs: fixed and variable pulse width.
- Up to 100 kHz pulse rate.
- Analogue Modulation or Triggered RF Ramp Down Mode (ZZZ)
- Fault Protection on Low Power, High Power, and High VSWR
- Operates on 28 VDC
Applications:
- RF Driver for an Acousto-Optic Q-Switch Device used spoiling
the “Q” of a CW laser so as to output an intense pulse of light.
- Used in industrial, medical, or military applications.
PARAMTER
SPECIFICATION
Number of Channels
2 Outputs (RF Power Split from One Oscillator.)
Output Frequency
XX = 24, 27, 41, 68, or 80
Where RF Frequency = 24.00, 27.12, 40.68, 68.00, 80.00 MHz ± 0.01%
Spurious Levels:
-50 dBc maximum
Harmonic Distortion
-30 dBc maximum
Digital Inputs:
Fixed Mod In
Variable Mod In
Modulation Common to Both Outputs.
TTL Levels, Triggered on Rising Edge. Pulse Width Applied >50 ns.
TTL Levels, TTL High = RF off
Extinction Ratio:
35 dB minimum
RF Rise Time 10% to 90%
500 ns maximum
RF Fall Time:90% to 10%
100 ns maximum
Modulation Repetition Rates:
1 Hz to 100 kHz for Fixed Modulation
DC to 100 kHz for Variable Modulation
Fixed Modulation
Output Pulse Width Adjustment Range:1 to 14 μs, Customer Adjustable
Available Pulse Control Options:
Pulse Control Mode is "Factory Set When Ordered":
ZZZ = Mode
FPS = First Pulse Suppression
PPK = Pre Pulse Kill
A05 = Analog Control
R05 = RF Switched to Analog Control
___ = Digital Modulation Only
FPS Trigger / Analog input
Units configured with FPS, PPK: TTL Levels,
Triggered on TTL Rising Edge.
Units configured with A05, R05: 0 to 5 volts analog.
RF Output Power Per Channel "Factory Set When Ordered":
Both Outputs Must Have 50 ohm Load
YY = 50 watts nominal for 24, 27, and 41MHz units
Adjustable from 12 to 50 watts.
*25 watts nominal for 68 and 80 MHz unit, Adjustable from 12 to 25 watts.
Output Impedance:
50 ohms nominal
Shutter Output:
0.3 sec delay. Opens on fault. Capable of sinking 1 amp at 28 volts Maximum.
Supply Voltage Input
+28 VDC ± 1%
Supply Current Input
6.5 A for 25 W /ch units 9.0 A for 50 W /ch units
Operating Temperature
+10℃ to +55℃
Air Flow through Heat Sink
> 36 CFM (> 17 litres / second) @ 25℃
MAXIMUM RATINGS:
Supply Voltage:
30 volts DC maximum
Power Output:
No DC Feedback Allowed
Storage Temperature:
-20℃ to +85℃
CONNECTORS & MECHANICAL:
Located on front panel
RF Output Connector:
BNC Female
Power Supply Connections:
Vcc Solder Post
Return Ground Lug
25PIN D-SUB CONNECTOR PINOUT:
Located on front panel. See Detail A of Outline Drawing.
1
+5V
+5V output for external fault indicators, 75 mA available.
2-3
NC
No connection.
4
THERM RTN
Ground – to be used as a return for THERM.
5
THERM 2
Thermostat connection – driver enters a fault condition unless this is shorted to ground.
6
THERM
Thermostat connection – driver enters a fault condition unless this is Shorted to ground.
7
DRV TEMP
Normally HIGH, goes LOW when the driver is in an overheat fault.
8
QS TEMP
Normally HIGH, goes LOW when no short present on THERM.
9
HVSWR
High VSWR fault, normally HIGH, goes LOW during fault.
10
LP
Low RF Power indicator, normally HIGH, goes LOW while driver output is below the Low RF Power threshold.
11
HP
High RF Power fault, normally HIGH, goes LOW during fault.
12
MOD IN ANALOG
Controls the output power level in A05 and R05 models
13
FAULT RESET
Pulse LOW to reset the driver from a fault condition. This line should not be held LOW or it will defeat some
of the fault conditions.
14
FPS TRG
Triggers a suppression pulse on a RISING edge.
15
MOD IN FIXED
Turns the driver off for the duration set by the pulse width control.
16
MOD IN VARIABLE
Turns the driver off while this input is HIGH.
17
SYNC OUT
Outputs a signal synchronized to the modulation output.
18-19
NC
No connection.
20
SHUTTER
0.3 sec delay. Opens on fault. Capable of sinking 1 amps at 28 volts maximum.
21-24
NC
No Connection
25
GND
Ground.
Note: Some Control Signals Shown on Outline Drawing are Not Available on Standard Units.
INDICATORS:
Located on front panel
Power
Power Indicator – The module has 28V applied on the DC connector.
Low Power
Faults after 0.3 second, power below LP Set Point. Resets on power adjusted above Set Point.
High Power
Faults when power above HP Set Point. Reset required after removing fault.
High VSWR
Faults when reflected power above VSWR Set Point. Reset required after removing fault.
QS Temp
Faults on open Thermostat. Resets on closed Thermostat. (Q-Switch below set temperature)
DRV Temp Driver
The internal temperature of the module has reached 60℃ The driver will remain in this fault condition until it
cools down.
ADJUSTMENTS:
Located Inside Unit Through Holes in Module Top Cover
RF Power Level Adjustment
Adjusts the output RF Power.
LP Set Point
Adjusts the minimum power threshold. If the module’s output goes Below this set value, the low power warning
light will turn on, but the driver will continue to output power. This is a warning, not a true fault condition.
HP Set Point
Adjusts the maximum power threshold for the module. If the output rises above this threshold, the module will
cease output until it is reset.
VSWR Set Point
Adjusts the module’s tolerance for a mismatched load connected to RF Out.If a mismatch is detected, the driver
will cease outputting power until reset.
Pulse Width
Adjusts the length of time the driver outputs no RF energy after receiving a trigger. 1μs to 14μs.
The following adjustment is not used on units configured with FPS or PPK:
Threshold
Sets the point below which the analog voltage is ignored and the system output is shut off.
The following adjustments are not used on units configured with Analog Input (A05, R05):
FPS Start
Adjusts the initial power level of the first pulse.
FPS Slope
Adjusts how quickly the RF pulses return to their normal level after the FPS has been triggered. 20 μs to 300 μs.
FPS Window
Adjusts the duration of the suppression pulse cycle. 20 μs to 300 μs.
Note: Some Adjustments Shown on Outline Drawing are Not Available on Standard Units.
Mechanical Dimensions:
Dimensions in inches and [mm]
商品属性 [操作频率] 24-80 MHz [最大射频功率] 25-50 W per channel [兼容的声光设备] Q Switch