hivolt HA61-3B30, Руководство по эксплуатации

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10
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∙
D-22419 Hamburg
∙
Germany
∙
+49 40 537122-0
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+49 40 537122-99
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info@hivolt.de
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www.hivolt.de
3.8 Loading Conditions
The amplifier is designed to drive capacitive and resistive-capacitive loads.
The slew rate that can be achieved on the output depends on the load capacitance and the setting of
the instantaneous output current limit. The effective load capacitance C
L
consists of the amplifier’s
internal output capacitance, the capacitance of the output cable (a typical coaxial cable: ca. 100pF/m)
and capacitance of the connected load.
The output stage can provide peak currents (I
OP
) of > ±50mA
P
for up to 1s. The maximum static output
current is +30mA and -30mA.
Achievable slew rate:
SR = I
O
/ C
L
[V/s] .
If the maximum slew rate is exceeded, distortions occur in the output signals. In principle, the
amplifier should thus only be controlled by input signals that satisfy the achievable slew rate for a
given load. The slew-rate limiter (3.4) can be used for this purpose.
However, dynamic override of the inputs (e.g. control by square wave signals) is harmless. The edges
of the output waveform are nearly linear then with a slight overshoot.
Large capacitive loads driven by high frequency signals may result in a DC-offset superimposed on the
output voltage. This occurs if the final value of the desired output voltage can not be reached
periodically.
3.9 Protection/Shutdown
During operation,
- the interlock circuit,
- the average output current (positive and negative),
- overload of the high voltage sources,
- oscillation of the power stage #,
- overtemperature of the power stage and the high voltage sources,
- the condition of the internal auxiliary power supplies
are monitored. In the event of a fault, the high voltage supplies are switched off. The shutdown state is
latched and displayed on LEDs. The detailed shutdown condition is available from different status
words via the command interface (
RS0 … RS3 ).
A shutdown state can only be left by a shutdown reset: pushbutton SDN RST , signal INTERLOCK.SDR ,
or command SRR .
After power on, the unit will be in shutdown state.
# this function is not available in the current version.
3.10 LEDs
LED Function
SYNC
on: CLK synchronized to master via SYNC IN
pulsed: trigger signal received
(if internal ARB/DDS signal generator is implemented)
OVERLOAD flaring: overload limit (no shutdown yet)
blink:
shutdown due to overload
OVERTEMP blink: shutdown due to overtemperature
pulsed: temperature warning (no shutdown yet)