Introduction LB1005 Operating Manual
6 Revision 1 Bookham
3. Input Offset Range: This 3-position switch determines the voltage range for
the Input Offset front panel knob. For more information, please see the above
section Front Panel Connections & Controls). Selecting the Off position disables
the Input Offset control so that no voltage offset is added.
4. Output Voltage Limits: These 15-turn trimpots determine the output
voltages that clamp the positive and negative voltage rails of the Output. See
section Setting Output Voltage Limits in Chapter 3 for more details.
5. Mod 1 Input, Mod 2 Input: Input signals to these BNC connectors are
summed into the Output signal. Each modulation input has an input voltage
range of ±10V, 1-MΩ input impedance, and 1-MHz bandwidth. See the
section Applying Modulation Inputs in Chapter 3 for more details.
6. Attn 1, Attn 2: These 15-turn trimpots attenuate the corresponding input
modulation signals from off (fully counter-clockwise) to unity gain (fully
clockwise). See the section Applying Modulation Inputs in Chapter 3 for more
details.
7. Aux Output: This BNC connector is the control voltage output directly from
the P-I filter section, bypassing the summing amplifier. The Output Voltage
Limits do not apply to this output. The output range is ±10 V with 50-Ω
output impedance.
8. Int Hold Input: This TTL logic input switches off the error signal input to the
P-I filter and holds the integrator output voltage at its current value. Table 4
shows logic levels for this input. Since this input is pulled low, the BNC can
be left unconnected for normal operation.
Table 4: Logic Levels for Int Hold Input
TTL Logic Level Function
Low (<0.8 V) Normal P-I filter operation.
High (>2.4 V) No error input to filter. Integrator holds its current voltage value.
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