Service manual

2-12 11713A Operating and Service Manual
Installing the Agilent Technologies 11713A Attenuator/Switch Driver
Connecting to Relays
❏ To drive ten devices, connect attenuator cables at ATTEN X and Y
and switch cables to S9 and S0.
A total of 10 relays may be on at one time if the total current is less
than 650 mA. However, since there are dual transistor and relay
drivers, where one driver is on while the other is off, a total of 20
relays may be controlled.
Figure 2-7 shows the connections for a simplified relay driving
circuit. This circuit is adaptable for simple non-latching relays.
CAUTION If the total continuous load current of 650 mA is exceeded, damage may
result.
Figure 2-7 Relay Driving Circuit
NOTE It is also recommended that two 28.7 V zener diodes be connected
back-to-back across the relay coils to reduce voltage transients.
Verifying Performance
9. Use the procedure for checking the electrical performance of the
attenuator/switch driver given in Chapter 4. If there is mechanical
damage or a defect, or if the instrument does not pass the electrical
performance test, notify the nearest Agilent Technologies office.
WARNING To avoid hazardous electrical shock, do not perform electrical
tests when there are signs of shipping damage to any portions
of the outer enclosure (covers, panels, connectors).