6
PIN DESCRIPTIONS
QCL D-SUB
Figure 5. Female 9-Pin D-SUB
Table 1. QCL D-SUB Pin-Out
PIN
DESCRIPTION
1, 2
Passive interlock pins (must be shorted to enable
current)
3
Chassis ground
4
Not used
5 *
QCL- (negative)
6
Not used
7
Not used
8
Not used
9 *
QCL+ (positive)
SHELL
Chassis ground
* NOTE: Use Pins 5 and 9 for current to the QCL.
QCL SMA
QCL- (negative)
QCL+ (ground)
Figure 6. SMA Pin-Out
QCL POLARITY
-V
Pin 9 QCL +
or SMA Outer Ring
Pin 5 QCL -
or SMA Center Pin
QCL Driver
Current Sink
QCL
Figure 7. QCL Polarity Diagram
MONITOR D-SUB
Figure 8. Male 9-Pin D-SUB
Table 2. Monitor D-SUB Pin-Out
PIN
DESCRIPTION
1
Alignment LED (+5 V) can source 250 mA
2
Alignment LED ground
3
QCL current enabled indicator (+5 V TTL)
high = disabled
low, ground = enabled
4
QCL current enabled indicator ground
5
Not used
6
Analog setpoint monitor
7
Analog monitor ground
8
Analog output current monitor
9
Analog monitor ground
BNC PINS
ACTIVE SIGNAL
GROUND
Figure 9. BNC Pins
TRANSFER FUNCTIONS BY MODEL
External modulation input, setpoint monitor, and analog
current monitor transfer functions:
QCL500 LAB:
0.1 A / V.
QCL1000 LAB:
0.2 A / V.
QCL1500 LAB:
0.3 A / V.
QCL2000 LAB:
0.4 A / V.
The input range is always -5 V to +5 V.
ACTIVE INTERLOCK BNC
Ground the center pin to the outer shell to override the interlock
and allow the current to flow to the QCL. If an external circuit
won’t be used, a 50 Ω or 75 Ω terminator is acceptable.
TRIGGER BNC
See Additional Capabilities on
.
