Power supply
Supply the board with +5 V on +Vcc pin and -5 V on -Vcc pin. Do not apply any voltage outside this range on the board.
Setpoint
Setpoint can be adjusted between -2.5 V and +2.5 V with the SETPOINT trimmer. The setpoint can be modulated with the SETPOINT MOD input. Modulation input is DC coupled, gain is 1 V/V, 0.1 V/V or 0.01 V/V, depending on the MOD GAIN jumper.
Feedback sign
The sign of the feedback for FAST OUT and SLOW OUT can be chosen with the FAST and SLOW jumpers (+1 or -1).
Integrator enable
FAST and SLOW integrators are enabled with the INT EN switch ON. When the switched are OFF, the integrators can still be enabled by applying a voltage between 2.2 V and 4.5 V on the FAST INT EN / SLOW INT EN pins.
Note that when the FAST (or SLOW) integrator is disabled, it behaves as a proportional at low frequencies (see dotted lines in the frequency response graph below). This is intended to facilitate the locking on narrow capture error signals (see https://tf.nist.gov/general/pdf/1819.pdf sec. 1.4.3).
Ramp in
A modulation can be added to the output of the slow integrator SLOW OUT via the RAMP IN pin.
Input / Output ranges
Input range is ±2 V on the IN and SETPOINT MOD inputs (50 Ω input impedance). Output range is ±2 V in the ERROR, FAST_OUT and SLOW_OUT outputs. ERROR and FAST_OUT have 50 Ω output impedance. SLOW_OUT has 1 kΩ output impedance.
Tuning the frequency response
The frequency response of the loop filter can be adjusted with the 3 blue rotary switches in clockwise order:
PROP: -13.3 dB / -6.6 dB / 0 dB / 6.6 dB / 13.3 dB / 20 dB / 26.6 dB.
FAST INT: 47 kHz / 100 kHz / 220 kHz / 470 kHz / 1 MHz / 2.2 MHz / 4.7 MHz.
SLOW INT (PI200 version): 800 mHz / 2.4 Hz / 8 Hz / 24 Hz / 80 Hz / 240 Hz / 800 Hz.
SLOW INT (PI200-T version): 8 mHz / 24 mHz / 80 mHz / 240 mHz / 800 mHz / 2.40 Hz / 8 Hz.
