hivolt HA61-3B30, Operating Manual

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3.2 Control Voltage Input IN
The BNC control voltage input IN is connected to a differential amplifier to suppress common mode
voltages between the external signal source and the amplifier (ground loops) It provides the analog
setpoint VONVA. The input can be adapted to the source impedance of the signal source by means of
the command
SRS .
The input signal reference is connected via a 100 Ω resistor to the amplifier signal ground and chassis
ground.
3.3 Monitor Outputs V MON, I MON
Two BNC monitor outputs provide actual values of output voltage and output current, both of which
are normalized to ±10 V.
The voltage monitor output
V MON receives its signal via a compensated voltage divider and provides a
scaled image of the output voltages. The frequency response is linear up to well above the upper cut-
off frequency of the amplifiers. The frequency response of the
I MON current monitor output is limited
to 30kHz in order to filter out the common mode ripple of the internal high voltage sources.
The monitor outputs are buffered (output impedance: 1k
Ω ) and short-circuit-proof. They are able to
drive capacitive loads (coaxial cables), but are not designed to drive cables with a low-impedance
termination.
The monitor values can also be read using the commands
RCM , RVM , ROM .
3.4 Slew-Rate Limiter
A programmable slew-rate limiter is provided. It limits the slew-rate of the analog control signal
VONVA. The commands
SCR and RCR are intended to control the slew-rate limiter.
Slew-rate limiter parameters:
SRLR_SP: slew-rate limiter rate [V\
μ s];
SRL_ENA: slew-rate limiter enable #
Disabling the slew-rate limiter results in maximum bandwidth of the analog input stage.
# this function is not available in the current version.
3.5 PID Controller
A programmable analog PID controller is provided to control the output voltage. By adjusting the PID
parameters, the controller can be optimized for the actual load characteristics.
The commands
SCD, SCI, SCP, RCD, RCI and RCP are intended to adjust and monitor the PID control
parameters.
PID control parameters:
PIDD_SP: PID D-component; typically below 20; 0 switches off the D-part of the PID controller;
PIDI_SP:
PID I-component; seven discrete steps; 0 switches off the I-part of the PID controller;
PIDI_L: PID I-limit; limits the influence of the I-component;
PIDP_SP: PID P-component; typically below 20;